WO2023277120A1 - 二環性ピペラジン環を有するベンゾオキサゾール誘導体又はその塩の製造方法、並びに、その原料の製造方法 - Google Patents
二環性ピペラジン環を有するベンゾオキサゾール誘導体又はその塩の製造方法、並びに、その原料の製造方法 Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D263/00—Heterocyclic compounds containing 1,3-oxazole or hydrogenated 1,3-oxazole rings
- C07D263/52—Heterocyclic compounds containing 1,3-oxazole or hydrogenated 1,3-oxazole rings condensed with carbocyclic rings or ring systems
- C07D263/54—Benzoxazoles; Hydrogenated benzoxazoles
- C07D263/58—Benzoxazoles; Hydrogenated benzoxazoles with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached in position 2
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D487/00—Heterocyclic compounds containing nitrogen atoms as the only ring hetero atoms in the condensed system, not provided for by groups C07D451/00 - C07D477/00
- C07D487/02—Heterocyclic compounds containing nitrogen atoms as the only ring hetero atoms in the condensed system, not provided for by groups C07D451/00 - C07D477/00 in which the condensed system contains two hetero rings
- C07D487/08—Bridged systems
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D417/00—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and sulfur atoms as the only ring hetero atoms, not provided for by group C07D415/00
- C07D417/02—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and sulfur atoms as the only ring hetero atoms, not provided for by group C07D415/00 containing two hetero rings
- C07D417/04—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and sulfur atoms as the only ring hetero atoms, not provided for by group C07D415/00 containing two hetero rings directly linked by a ring-member-to-ring-member bond
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K31/00—Medicinal preparations containing organic active ingredients
- A61K31/33—Heterocyclic compounds
- A61K31/395—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins
- A61K31/495—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having six-membered rings with two or more nitrogen atoms as the only ring heteroatoms, e.g. piperazine or tetrazines
- A61K31/4995—Pyrazines or piperazines forming part of bridged ring systems
Definitions
- the present invention relates to a method for producing a benzoxazole derivative having a bicyclic piperazine ring or a salt thereof, and a method for producing a raw material thereof, and more particularly, 1- ⁇ [2-(3,6-diazabicyclo[3.1 .1]heptan-3-yl)-7-(thiazol-2-yl)benzo[d]oxazol-4-yl]oxy ⁇ -1,1-difluoro-2-methylpropan-2-ol or a salt thereof and a method for producing a raw 2-alkoxybenzo[d]oxazole derivative or a salt thereof.
- 4-(benzyloxy)-7-bromobenzo[d]oxazole-2-thiol used in the above production method can be obtained, for example, from 2-nitroresorcinol by di-O-benzyl etherification reaction (formation of protecting group). , partial deprotection reaction (partial de-O-benzylation), bromination reaction, reduction reaction, and cyclization reaction accompanied by a leaving group (thiol group).
- Patent Document 1 4-(benzyloxy)-7-bromobenzo[d]oxazole-2-thiol used in the above production method can be obtained, for example, from 2-nitroresorcinol by di-O-benzyl etherification reaction (formation of protecting group). , partial deprotection reaction (partial de-O-benzylation), bromination reaction, reduction reaction, and cyclization reaction accompanied by a leaving group (thiol group).
- the present invention has been made in view of the above problems, and is a 1- ⁇ [2-(3,6-diazabicyclo[3.1.1]heptane- 3-yl)-7-(thiazol-2-yl)benzo[d]oxazol-4-yl]oxy ⁇ -1,1-difluoro-2-methylpropan-2-ol or a salt thereof intended to provide
- the present inventors have made intensive studies to solve the above problems, and found that a 2-alkoxybenzo[d]oxazole derivative represented by the following formula (2) or a salt thereof was converted to 1- ⁇ [2-(3 ,6-diazabicyclo[3.1.1]heptan-3-yl)-7-(thiazol-2-yl)benzo[d]oxazol-4-yl]oxy ⁇ -1,1-difluoro-2-methyl It was found to be used as a raw material for propan-2-ol or a salt thereof. That is, the compound represented by formula (2) and its salt can be produced by a method that does not require highly toxic and difficult-to-handle reagents or highly dangerous operations, and that no toxic substances are generated during the reaction. can.
- the present inventors found that the production method using the compound represented by the formula (2) or a salt thereof can reduce the number of steps compared to existing production methods, and , 1- ⁇ [2-(3,6-diazabicyclo[3.1.1]heptan-3-yl)-7-(thiazol-2-yl)benzo[ It has also been found that d]oxazol-4-yl]oxy ⁇ -1,1-difluoro-2-methylpropan-2-ol or a salt thereof can be obtained.
- R a represents a hydrogen atom or an optionally substituted arylmethyl group
- R b represents an optionally substituted alkyl group or cyclic alkyl group
- R 3 represents a hydrogen atom, a halogen atom or a thiazol-2-yl group
- X a represents a hydrogen atom or a halogen atom.
- the step B is In the above formula (2), R a is an optionally substituted arylmethyl group, R b is an optionally substituted alkyl group, R 3 is a halogen atom, and X a is a hydrogen atom.
- R a is an optionally substituted arylmethyl group
- R b is an optionally substituted alkyl group
- R 3 is a halogen atom
- X a is a hydrogen atom.
- R a is an optionally substituted arylmethyl group
- R 3 is a halogen atom
- Boc is a tert-butoxycarbonyl group.
- a compound represented by A thiazol-2-yl group is introduced into the compound represented by the formula (4) by a cross-coupling reaction in the presence of a metal catalyst to give the formula (5):
- R a is an optionally substituted arylmethyl group
- Boc is a tert-butoxycarbonyl group.
- the step B is In the above formula (2), R a is an optionally substituted arylmethyl group, R b is an optionally substituted alkyl group, R 3 is a halogen atom, and X a is a hydrogen atom.
- a thiazol-2-yl group is introduced into a certain compound (2-1) by a cross-coupling reaction in the presence of a metal catalyst, and in the above formula (2), R a is an optionally substituted arylmethyl group.
- R b is an optionally substituted alkyl group
- R 3 is a thiazol-2-yl group
- X a is a hydrogen atom
- OR b of compound (2-11) is substituted with tert-butyl 3,6-diazabicyclo[3.1.1]heptane-6-carboxylate to give formula (5):
- R a is an optionally substituted arylmethyl group
- Boc is a tert-butoxycarbonyl group.
- the step B is Compound (2-2) wherein R a is a hydrogen atom, R b is an optionally substituted alkyl group, R 3 is a hydrogen atom, and X a is a hydrogen atom in the formula (2) and a brominating agent, wherein R a is a hydrogen atom, R b is an optionally substituted alkyl group, R 3 is a bromine atom, and X a is bromine
- R a is a hydrogen atom
- R b is an optionally substituted alkyl group
- R 3 is a bromine atom
- X a is bromine
- Boc is a tert-butoxycarbonyl group.
- a compound represented by A thiazol-2-yl group is introduced into the compound represented by the formula (8) by a cross-coupling reaction in the presence of a metal catalyst to obtain the formula (9):
- R 1 represents a hydroxyl group, a halogen atom or an arylmethyloxy group
- R 2 represents a hydroxyl group or a halogen atom
- R 3 represents a hydrogen atom, a halogen atom or a thiazol-2-yl group.
- the step A is In the above formula (10), the compound (10-1) in which R 1 is a halogen atom, R 2 is a halogen atom, and R 3 is a hydrogen atom is reacted with benzyl alcohol to obtain the formula (10-11):
- R 2 is a halogen atom and Bn is a benzyl group.
- a compound represented by The compound represented by the formula (10-11) is reacted with a brominating agent to obtain the formula (10-12):
- R 2 is a halogen atom and Bn is a benzyl group.
- a compound represented by The compound represented by the formula (10-12) is reacted with an alkaline aqueous solution to obtain the formula (10-13):
- Bn is a benzyl group.
- the step A is In the above formula (10), the compound (10-2) in which R 1 is a hydroxyl group, R 2 is a hydroxyl group, and R 3 is a hydrogen atom is reduced and then reacted with tetraalkoxymethane in the presence of an acid catalyst,
- the production method according to [5] which is a step of producing the compound represented by the formula (2) or a salt thereof by reacting with a brominating agent.
- Boc is a tert-butoxycarbonyl group.
- a step B of producing a compound represented by formula (3) or a salt thereof using a compound represented by formula (2) or a salt thereof and a step C of producing a compound represented by formula (1) or a salt thereof using a compound represented by formula (3) or a salt thereof (hereinafter sometimes simply referred to as "the method of the present invention manufacturing method”).
- the compound obtained by the production method of the present invention has the following formula (1):
- the compound obtained by the production method of the present invention may be a salt of the compound represented by formula (1) according to the present invention (hereinafter sometimes referred to as "compound (1)"), and the salt is , is preferably a pharmaceutically acceptable salt.
- the pharmaceutically acceptable salt is preferably in the form of an acid addition salt, and examples of the acid of the acid addition salt include hydrofluoric acid, hydrochloric acid, hydrobromic acid, hydroiodic acid, and the like.
- hydrohalic acids such as sulfuric acid, nitric acid, phosphoric acid, hydrogen peroxide, and carbonic acid
- organic carboxylic acids such as acid, butyric acid, maleic acid, propionic acid, formic acid, and malic acid
- acidic amino acids such as aspartic acid and glutamic acid
- alkylsulfonic acids such as methanesulfonic acid
- arylsulfonic acids such as p-toluenesulfonic acid.
- Boc represents a tert-butoxycarbonyl group.
- tert-butyl 3-(4-hydroxy-7-(thiazol-2-yl)benzo[d]oxazol-2-yl)-3,6-diazabicyclo[3.1.1]heptane-6- It can be obtained using a carboxylate (hereinafter sometimes referred to as "compound (3)") or a salt thereof.
- compound (3) a carboxylate
- a known method or a method analogous thereto can be appropriately employed, and for example, the method described in Patent Document 1 can be used.
- Salts of compound (3) include the same salts as those of compound (1), including preferred forms thereof.
- compound (3) or a salt thereof is obtained using a compound represented by formula (2) according to the present invention (hereinafter sometimes referred to as "compound (2)”) or a salt thereof.
- compound (2) has the following formula (2):
- R a represents a hydrogen atom or an optionally substituted arylmethyl group
- R b represents an optionally substituted alkyl group or cyclic alkyl group
- R 3 represents a hydrogen atom.
- R a represents a hydrogen atom or an optionally substituted arylmethyl group
- R b represents an optionally substituted alkyl group or cyclic alkyl group
- R 3 represents a hydrogen atom.
- R a represents a hydrogen atom or an optionally substituted arylmethyl group
- R b represents an optionally substituted alkyl group or cyclic alkyl group
- R 3 represents a hydrogen atom.
- X a represents a hydrogen atom or a halogen atom.
- arylmethyl group includes, for example, a phenylmethyl group (benzyl group), a diphenylmethyl group (benzhydryl group), a triphenylmethyl group (trityl group), and the like, with a benzyl group being particularly preferred.
- the arylmethyl group represented by R a according to the present invention may be substituted with one or more substituents which may be the same or different.
- an "arylmethyloxy group” is a group represented by the following formula: --OA, where A represents an arylmethyl group.
- A represents an arylmethyl group.
- the arylmethyl group include the groups listed above, and a benzyl group is particularly preferred.
- the arylmethyloxy group represented by R 1 below according to the present invention the arylmethyl group may be substituted with one or more substituents which may be the same or different.
- alkyl group refers to a linear or branched alkyl group, preferably having 1 to 6 carbon atoms, more preferably 1 to 3 carbon atoms.
- the alkyl group represented by R b according to the present invention may be substituted with one or more substituents which may be the same or different.
- substituents include methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, sec-butyl group, isobutyl group, tert-butyl group, n-pentyl group, n-hexyl group and the like. is mentioned.
- cyclic alkyl group refers to a cyclic alkyl group having preferably 3 to 8 carbon atoms, ie, the number of ring members, and more preferably 3 to 6 carbon atoms.
- the cyclic alkyl group represented by R b according to the present invention may be substituted with one or more substituents which may be the same or different.
- substituents include cyclopropyl group, cyclobutyl group, cyclopentyl group, cyclohexyl group, cycloheptyl group, cyclooctyl group and the like.
- halogen atom refers to a fluorine atom, a chlorine atom, a bromine atom, or an iodine atom.
- the term "optionally substituted” indicates that any one or two or more hydrogen atoms may be substituted with other atoms or groups (substituents), and 2 When more than one hydrogen atom is substituted, said substituents (atoms, groups) may be the same or different from each other. Examples of such substituents include halogen atoms, cyano groups, nitro groups, hydroxyl groups, amino groups, carbonyl groups, carboxy groups, alkyl groups, alkoxy groups, cyclic alkoxy groups, alkylamino groups, cyclic alkylamino groups, and an azide group and the like;
- Compound (2) according to the present invention includes, for example, the following compounds: 2-Methoxybenzo[d]oxazol-4-ol, 2-ethoxybenzo[d]oxazol-4-ol, 2-propoxybenzo[d]oxazol-4-ol, 2-isopropoxybenzo[d]oxazol-4 -ol, 2-butoxybenzo[d]oxazol-4-ol, 2-isobutoxybenzo[d]oxazol-4-ol, 2-(sec-butoxy)benzo[d]oxazol-4-ol, 2-( tert-butoxy)benzo[d]oxazol-4-ol, 2-pentoxybenzo[d]oxazol-4-ol, 2-(pentan-2-yloxy)benzo[d]oxazol-4-ol, 2-[ (3-methylbutan-2-yl)oxy]benzo[d]oxazol-4-ol, 2-(tert-pentyloxy)benzo
- the compound (2) according to the present invention is preferably 2-ethoxybenzo[d]oxazol-4-ol, the following formula (7):
- Examples of the salt of compound (2) according to the present invention include the same salts as those of compound (1), including preferred forms thereof.
- Compound (2) or a salt thereof according to the present invention is obtained by using a compound represented by the following formula (10) (hereinafter sometimes referred to as "compound (10)") or a salt thereof, It is preferably obtained by the step A of producing a salt.
- R 1 represents a hydroxyl group, a halogen atom, or an arylmethyloxy group
- R 2 represents a hydroxyl group or a halogen atom
- Ra each independently represents a hydrogen atom or a substituted a good arylmethyl group
- R b represents an optionally substituted alkyl group or a cyclic alkyl group
- R 3 each independently represents a hydrogen atom, a halogen atom or a thiazol-2-yl group
- X a each independently represents a hydrogen atom or a halogen atom.
- Step A the nitro group of the compound represented by Formula (10) is reduced by a reductive reaction to produce a compound represented by Formula A (hereinafter sometimes referred to as "compound A” ), and then compound (2) is obtained by cyclization of compound A.
- Step B the 2-alkoxy group (OR b ) of the obtained compound (2) is replaced with tert-butyl 3,6-diazabicyclo[3.1.1]heptane-6-carboxy (substitution reaction) to obtain a compound represented by formula B (hereinafter sometimes referred to as "compound B") or compound (3).
- compound B may optionally undergo introduction of a thiazol-2-yl group by cross-coupling reaction, removal of the protecting group of R a by deprotection reaction, and conversion of X a other than a hydrogen atom to a hydrogen atom. By doing so, compound (3) is obtained.
- compound (3) is O-alkylated to obtain a compound represented by Formula C (hereinafter sometimes referred to as “compound C”), and then a deprotection reaction is carried out to form tert-butoxy A carbonyl group (hereinafter sometimes referred to as "Boc”) is removed to obtain compound (1).
- compound C a compound represented by Formula C
- Boc tert-butoxy A carbonyl group
- step A compound (10) is preferably compound (10-1) in which R 1 and R 2 are halogen atoms and R 3 is hydrogen atom, more preferably from 2,6-difluoronitrobenzene in which R 1 and R 2 are fluorine atoms and R 3 is a hydrogen atom, or as compound (10) in which R 1 and R 2 are hydroxyl groups and R 3 is a hydrogen atom It is preferable to include a step of producing compound (2) or a salt thereof from compound (10-2), that is, 2-nitroresorcinol.
- compound (10-1) more preferably 2,6-difluoronitrobenzene
- compound (10-1) preferably 2,6-difluoronitrobenzene
- alcohol partial substitution reaction
- a compound represented by (compound (10-11) A compound represented by (compound (10-11)).
- Bn is a benzyl group (hereinafter the same), R 2 is a halogen atom, and R 2 is more preferably a fluorine atom.
- the compound (10-11) is reacted with a brominating agent (bromination reaction) to give the following formula (10-12):
- R 2 is a halogen atom, and R 2 is more preferably a fluorine atom.
- the compound (10-12) is reacted with an alkaline aqueous solution (hydration reaction) to give the following formula (10-13):
- a compound (compound (14)) represented by is obtained.
- the compound (2) for example, the compound represented by the formula (15)
- a salt thereof is produced by reacting the compound (14) with tetraalkoxymethane (cyclization reaction involving an alkoxy group). can do.
- the compound (10-2) (2-nitroresorcinol) is used as the compound (10), for example, first, the compound (10-2) is reacted with a reducing agent (reduction reaction), and the compound ( 10-21) (2-aminoresorcinol) is reacted with compound (10-21) and tetraalkoxymethane (cyclization reaction involving an alkoxy group) to give compound (10-22) (2-ethoxybenzo[d ] oxazol-4-ol). Then, by reacting compound (10-22) with a brominating agent (bromination reaction), compound (2) (eg, the compound represented by formula (7) above) or a salt thereof can be produced. can.
- a reducing agent reduction reaction
- the compound ( 10-21) (2-aminoresorcinol) is reacted with compound (10-21) and tetraalkoxymethane (cyclization reaction involving an alkoxy group) to give compound (10-22) (2-ethoxybenzo[d ] oxazol-4-ol).
- step B preferably as compound (2), R a is an optionally substituted arylmethyl group and R b is an optionally substituted alkyl group. and from compound (2-1) (more preferably, a compound in which R a is a benzyl group) in which R 3 is a halogen atom and X a is a hydrogen atom, or as compound (2), R a is Compound (2-2) (2-2) which is a hydrogen atom, R b is an optionally substituted alkyl group, R 3 is a hydrogen atom, and X a is a hydrogen atom (more preferably, R b is an ethyl group It is preferable to include a step of producing compound (3) or a salt thereof from each compound).
- first compound (2-1) (more preferably, a compound in which R a is a benzyl group and R 3 is a bromine atom) of OR b with tert-butyl 3,6-diazabicyclo[3.1.1]heptane-6-carboxylate (substitution reaction) of the following formula (4):
- R a is an optionally substituted arylmethyl group, and R 3 is a halogen atom.
- R a in formula (4) is preferably a benzyl group, and R 3 is preferably a bromine atom.
- a thiazol-2-yl group is introduced into compound (4) by a cross-coupling reaction in the presence of a metal catalyst to give the following formula (5):
- R a is an optionally substituted arylmethyl group.
- a benzyl group is preferable as R a in formula (5).
- compound (3) or a salt thereof can be produced by reacting compound (5) with an organic acid (deprotection reaction).
- compound (2-1) is used as compound (2)
- compound (2-1) (more preferably, R a is a benzyl group and R b is A compound that is an ethyl group) is introduced with a thiazol-2-yl group by a cross-coupling reaction in the presence of a metal catalyst, and in the above formula (2), R a is an optionally substituted arylmethyl group.
- R b is an optionally substituted alkyl group
- R 3 is a thiazol-2-yl group
- X a is a hydrogen atom (2-11).
- a compound represented by (compound (6)) is preferred.
- Et is an ethyl group (same below).
- OR b of compound (2-11) is substituted with tert-butyl 3,6-diazabicyclo[3.1.1]heptane-6-carboxylate (substitution reaction) to give compound (5) (R a is a benzyl group).
- compound (3) or a salt thereof can be produced by reacting compound (5) with an organic acid (deprotection reaction).
- compound (2-2) when compound (2-2) is used as compound (2), for example, first, compound (2-2) (more preferably, a compound in which Rb is an ethyl group) and a brominating agent A compound (2) in which R a is a hydrogen atom, R b is an optionally substituted alkyl group, R 3 is a bromine atom, X -21).
- compound (2-2) the following formula (7):
- compound (3) or a salt thereof can be produced by reacting compound (9) with metals (conversion reaction).
- each intermediate compound may or may not be isolated, and if not isolated, each reaction can be carried out continuously.
- compound (10-11) is preferably obtained by partial substitution reaction by reacting compound (10-1) with benzyl alcohol.
- the partial substitution reaction is preferably carried out by reacting a substrate (here, compound (10-1)) with benzyl alcohol in a suitable solvent in the presence or absence of a base, and the preferred conditions are They are as follows.
- solvent examples include hydrocarbon organic solvents such as petroleum ether, n-pentane, n-hexane, n-heptane, cyclohexane, benzene, toluene and xylene; carbon tetrachloride, dichloromethane, chloroform, 1,2-dichloroethane.
- hydrocarbon organic solvents such as petroleum ether, n-pentane, n-hexane, n-heptane, cyclohexane, benzene, toluene and xylene
- carbon tetrachloride dichloromethane, chloroform, 1,2-dichloroethane.
- halogenated hydrocarbon organic solvents such as chlorobenzene; ether organic solvents such as diethyl ether, diisopropyl ether, methyl tert-butyl ether, methylcyclopentyl ether, tetrahydrofuran, 2-methyltetrahydrofuran, 1,4-dioxane and diphenyl ether; methyl acetate , ethyl acetate, n-propyl acetate, isopropyl acetate, n-butyl acetate, isobutyl acetate, tert-butyl acetate, benzyl acetate, methyl propionate, ethyl propionate, n-propyl propionate, isopropyl propionate, n-propionate ester-based organic solvents such as butyl, isobutyl propionate and tert-butyl propionate; and; Among aprotic polar
- the solvent is preferably selected from the group consisting of tetrahydrofuran, 2-methyltetrahydrofuran, 1,4-dioxane, acetonitrile, N,N-dimethylformamide, N,N-dimethylacetamide, dimethylsulfoxide and N-methyl-2-pyrrolidone. and more preferably at least one selected from the group consisting of N,N-dimethylformamide and dimethylsulfoxide.
- Examples of the base include sodium hydrogen carbonate, sodium carbonate, potassium hydrogen carbonate, potassium carbonate, cesium carbonate, sodium acetate, potassium acetate, sodium phosphate, potassium phosphate, lithium hydroxide, sodium hydroxide, potassium hydroxide and Salts such as barium hydroxide; trimethylamine, triethylamine, tributylamine, diisopropylethylamine, 2-(dimethylamino)ethanol, N-methylpyrrolidine, N-methylpiperidine, N-methylmorpholine, N,N'-dimethylpiperazine, N, N,N',N'-tetramethylethylenediamine, N,N-dimethylaniline, 1,4-diazabicyclo[2.2.2]octane, 1,5-diazabicyclo[4.3.0]non-5-ene , 1,8-diazabicyclo[5.4.0]undec-7-ene, pyridine, picoline, 4-(dimethylamino)pyr
- the base is preferably at least one selected from the group consisting of sodium carbonate, potassium carbonate, triethylamine, diisopropylethylamine, sodium tert-butoxide and potassium tert-butoxide, more preferably potassium carbonate and sodium tert- At least one selected from the group consisting of butoxide is included.
- the amount of the base used in the partial substitution reaction is 0.01 to 20 equivalents, preferably 0.1 to 10 equivalents, more preferably 1 to 5 equivalents, relative to the substrate.
- the amount of benzyl alcohol used in the partial substitution reaction is 0.8 to 5 equivalents, preferably 0.9 to 2 equivalents, relative to the substrate.
- the reaction temperature of the partial substitution reaction is in the range of 0 to 200°C, preferably in the range of 50 to 150°C, more preferably in the range of 80 to 120°C.
- the reaction time of the partial substitution reaction is in the range of 1 to 100 hours, preferably in the range of 5 to 50 hours, more preferably in the range of 10 to 30 hours.
- compound (2-21) is preferably obtained by a bromination reaction by reacting compound (2-2) with a brominating agent.
- compound (10-12) is obtained by a bromination reaction by reacting compound (10-11) with a brominating agent.
- the compound (2) is obtained by the bromination reaction by reacting the compound (10-22) with a brominating agent.
- the substrate here, compound (2-2), compound (10-11) or compound (10-22)
- a brominating agent and the preferred conditions are as follows.
- the solvent examples include protic solvents such as water, methanol, ethanol, n-propanol, 2-propanol, n-butanol, 2-butanol and tert-butanol; petroleum ether, n-pentane, n-hexane, n- - Hydrocarbon organic solvents such as heptane, cyclohexane, benzene, toluene and xylene; halogenated hydrocarbon organic solvents such as carbon tetrachloride, dichloromethane, chloroform, 1,2-dichloroethane and chlorobenzene; diethyl ether, diisopropyl ether, methyl Ether-based organic solvents such as tert-butyl ether, methylcyclopentyl ether, tetrahydrofuran, 2-methyltetrahydrofuran, 1,4-dioxane and diphenyl ether; methyl acetate, pro
- the solvent is preferably selected from the group consisting of ethyl acetate, n-propyl acetate, isopropyl acetate, n-butyl acetate, acetonitrile, N,N-dimethylformamide, N,N-dimethylacetamide and N-methyl-2-pyrrolidone. and more preferably at least one selected from the group consisting of acetonitrile and ethyl acetate.
- acid catalysts include formic acid, acetic acid, trifluoroacetic acid, propionic acid, lactic acid, succinic acid, citric acid, methanesulfonic acid, trifluoromethanesulfonic acid, 10-camphor-sulfonic acid, benzenesulfonic acid and p-toluene.
- Organic acids such as sulfonic acid; hydrochloric acid, hydrobromic acid, hydroiodic acid, sulfuric acid, nitric acid, phosphoric acid, perchloric acid, 12 molybdo (VI) phosphate hydrate and 12 tungsto (VI) phosphate hydrate and; tetrafluoroborate diethyl ether complex, boron trifluoride diethyl ether complex, boron trichloride, boron tribromide, magnesium chloride, magnesium bromide diethyl ether complex, zinc chloride, stannic chloride , ferric chloride, aluminum chloride, titanium tetrachloride and Lewis acids such as zirconium tetrachloride.
- the acid catalyst is preferably at least one (preferably any one) selected from the group consisting of acetic acid, tetrafluoroborate diethyl ether complex and chlorotrimethylsilane. and more preferably at least one (preferably any one) selected from the group consisting of acetic acid and chlorotrimethylsilane.
- the amount of the acid catalyst used is 0 to 1 equivalent, preferably 0 to 0.7 equivalent, relative to the substrate.
- brominating agent examples include bromine, bromine-1,4-dioxane complex, tetrabutylammonium tribromide, benzyltrimethylammonium tribromide, trimethylphenylammonium tribromide, 1-butyl-3-methylimidazolium tribromide, 1 ,8-diazabicyclo[5.4.0]-7-undecene hydrogen tribromide, pyridinium bromide perbromide, 4-dimethylaminopyridinium bromide perbromide, N-bromoacetamide, N-bromosuccinimide, N-bromophthalimide , N-bromosaccharin, dibromocyanuric acid, monosodium bromocyanurate, 1,3-dibromo-5,5-dimethylhydantoin, bromodimethylsulfonium bromide, bis(2,4,6-trimethylpyridine) bromonium hexafluoro
- the brominating agent is preferably selected from the group consisting of bromine, tetrabutylammonium tribromide, benzyltrimethylammonium tribromide, N-bromosuccinimide, N-bromosaccharin and 1,3-dibromo-5,5-dimethylhydantoin. and more preferably at least one selected from the group consisting of N-bromosuccinimide (preferably any one).
- the amount of the brominating agent used is 0.8 to 5 equivalents, preferably 1 to 5 equivalents, relative to the substrate when one atom of bromine atom is introduced into one molecule of the substrate. 2 equivalents.
- the amount is 1.8 to 5 equivalents, preferably 2 to 3 equivalents, relative to the substrate.
- the reaction temperature of the bromination reaction is in the range of -50 to 100°C, preferably in the range of -25 to 50°C, more preferably in the range of -10 to 30°C.
- the reaction time of the bromination reaction is in the range of 10 minutes to 12 hours, preferably in the range of 20 minutes to 6 hours, more preferably in the range of 30 minutes to 4 hours.
- compound (10-13) is preferably obtained by hydration reaction by reacting compound (10-12) with an alkaline solution.
- the hydration reaction is preferably carried out by reacting the substrate (here, compound (10-12)) with an alkaline aqueous solution in a suitable solvent, and the preferred conditions are as follows.
- solvent examples include hydrocarbon organic solvents such as petroleum ether, n-pentane, n-hexane, n-heptane, cyclohexane, benzene, toluene and xylene; carbon tetrachloride, dichloromethane, chloroform, 1,2-dichloroethane.
- hydrocarbon organic solvents such as petroleum ether, n-pentane, n-hexane, n-heptane, cyclohexane, benzene, toluene and xylene
- carbon tetrachloride dichloromethane, chloroform, 1,2-dichloroethane.
- halogenated hydrocarbon organic solvents such as chlorobenzene; ether organic solvents such as diethyl ether, diisopropyl ether, methyl tert-butyl ether, methylcyclopentyl ether, tetrahydrofuran, 2-methyltetrahydrofuran, 1,4-dioxane and diphenyl ether; methyl acetate , ethyl acetate, n-propyl acetate, isopropyl acetate, n-butyl acetate, isobutyl acetate, tert-butyl acetate, benzyl acetate, methyl propionate, ethyl propionate, n-propyl propionate, isopropyl propionate, n-propionate ester-based organic solvents such as butyl, isobutyl propionate and tert-butyl propionate; and; Among aprotic polar
- the solvent is preferably selected from the group consisting of tetrahydrofuran, 2-methyltetrahydrofuran, 1,4-dioxane, acetonitrile, N,N-dimethylformamide, N,N-dimethylacetamide, dimethylsulfoxide and N-methyl-2-pyrrolidone. and more preferably at least one selected from the group consisting of N,N-dimethylacetamide and dimethylsulfoxide.
- alkaline aqueous solution examples include sodium hydrogen carbonate, sodium carbonate, potassium hydrogen carbonate, potassium carbonate, cesium carbonate, sodium acetate, potassium acetate, sodium phosphate, lithium hydroxide, sodium hydroxide, potassium hydroxide and barium hydroxide. It is possible to use one of the aqueous solutions such as the above alone or by mixing two or more of them in an appropriate ratio.
- the alkaline aqueous solution is preferably an aqueous solution of at least one (preferably any one) selected from the group consisting of sodium hydrogen carbonate, potassium carbonate, sodium hydroxide and potassium hydroxide, and more preferably water.
- the concentration of the alkaline aqueous solution is not particularly limited and can be adjusted as appropriate.
- the reaction temperature of the hydration reaction is in the range of 0 to 200°C, preferably in the range of 25 to 150°C, more preferably in the range of 50 to 100°C.
- the reaction time of the hydration reaction is in the range of 10 minutes to 20 hours, preferably in the range of 20 minutes to 10 hours, more preferably in the range of 30 minutes to 5 hours.
- compound (14) is preferably obtained by a reduction reaction by reacting compound (10-13) with a reducing agent.
- compound (10-21) is obtained by a reduction reaction by reacting compound (10-2) with a reducing agent.
- the reduction reaction is preferably carried out by reacting the substrate (here, compound (10-13) and compound (10-2)) with a reducing agent in an appropriate solvent, and the preferred conditions are as follows. be.
- the solvent examples include protic solvents such as water, methanol, ethanol, n-propanol, 2-propanol, n-butanol, 2-butanol and tert-butanol; petroleum ether, n-pentane, n-hexane, n- - hydrocarbon solvents such as heptane, cyclohexane, benzene, toluene and xylene; halogen solvents such as carbon tetrachloride, dichloromethane, chloroform, 1,2-dichloroethane and chlorobenzene, diethyl ether, diisopropyl ether, methyl tert-butyl ether, methyl Ether-based organic solvents such as cyclopentyl ether, tetrahydrofuran, 2-methyltetrahydrofuran, 1,4-dioxane and diphenyl ether; methyl acetate, ethyl
- the solvent is preferably at least one selected from the group consisting of water, methanol, ethanol, ethyl acetate and n-butyl acetate, more preferably selected from the group consisting of water, ethanol and ethyl acetate. At least 1 type is mentioned.
- the solvent includes acids such as formic acid, acetic acid, trifluoroacetic acid, hydrochloric acid, sulfuric acid, phosphoric acid, methanesulfonic acid and toluenesulfonic acid, or sodium hydrogen carbonate, potassium hydrogen carbonate, sodium carbonate, potassium carbonate, carbonate Bases such as cesium, lithium hydroxide, sodium hydroxide and potassium hydroxide may be added as appropriate.
- the reducing agent examples include metals such as zinc, aluminum, tin, stannous chloride and iron; hydrogenation of palladium, platinum, rhodium and nickel which may be used with a hydrogen source and optionally with a carrier; Catalysts; and; inorganic salts such as sodium dithionite, etc., may be used singly or in admixture of two or more at an appropriate ratio.
- metals such as zinc, aluminum, tin, stannous chloride and iron
- hydrogenation of palladium, platinum, rhodium and nickel which may be used with a hydrogen source and optionally with a carrier
- Catalysts and
- inorganic salts such as sodium dithionite, etc.
- the reducing agent is preferably at least one (preferably any one) selected from the group consisting of zinc, iron, palladium on activated carbon and sodium dithionite, more preferably palladium on activated carbon and zinc At least one (preferably any one) selected from the group consisting of sodium dithionate is included.
- the reducing agent when the reducing agent is the metal and/or the inorganic salt, they are used in large excess. , preferably 20 equivalents or less, more preferably 10 equivalents or less.
- the reducing agent when the reducing agent is the hydrogenation catalyst, it is used in a catalytic amount, preferably 10 wt% or less, more preferably 5 wt%, based on the total weight (wt) of the feedstock. It is below.
- the reaction temperature of the reduction reaction is in the range of -10 to 100°C, preferably in the range of -5 to 80°C, more preferably in the range of 0 to 50°C.
- the reaction time of the reduction reaction is in the range of 10 minutes to 24 hours, preferably in the range of 20 minutes to 12 hours, more preferably in the range of 30 minutes to 6 hours.
- compound (2) is preferably obtained by reacting compound (14) with tetraalkoxymethane through a cyclization reaction involving an alkoxy group. Further, by reacting compound (10-21) with tetraalkoxymethane, a compound (10-22) is obtained through a cyclization reaction involving an alkoxy group.
- the cyclization reaction involving an alkoxy group is performed by reacting a substrate (here, compound (14) or compound (10-21)) with tetraalkoxymethane in an appropriate solvent in the presence of an acid catalyst.
- a substrate here, compound (14) or compound (10-21)
- tetraalkoxymethane in an appropriate solvent in the presence of an acid catalyst.
- solvent examples include hydrocarbon organic solvents such as petroleum ether, n-pentane, n-hexane, n-heptane, cyclohexane, benzene, toluene and xylene; carbon tetrachloride, dichloromethane, chloroform, 1,2-dichloroethane.
- hydrocarbon organic solvents such as petroleum ether, n-pentane, n-hexane, n-heptane, cyclohexane, benzene, toluene and xylene
- carbon tetrachloride dichloromethane, chloroform, 1,2-dichloroethane.
- halogenated hydrocarbon organic solvents such as chlorobenzene; ether organic solvents such as diethyl ether, diisopropyl ether, methyl tert-butyl ether, methylcyclopentyl ether, tetrahydrofuran, 2-methyltetrahydrofuran, 1,4-dioxane and diphenyl ether; methyl acetate , ethyl acetate, n-propyl acetate, isopropyl acetate, n-butyl acetate, isobutyl acetate, tert-butyl acetate, benzyl acetate, methyl propionate, ethyl propionate, n-propyl propionate, isopropyl propionate, n-propionate butyl, isobutyl propionate and tert-butyl propionate ester organic solvents; and; acetone, 2-butanone, methyl is
- the solvent is preferably n-hexane, n-heptane, toluene, xylene, methyl tert-butyl ether, 2-methyltetrahydrofuran, ethyl acetate, n-propyl acetate, isopropyl acetate, n-butyl acetate, isobutyl acetate and tert-acetate.
- acid catalysts include formic acid, acetic acid, trifluoroacetic acid, propionic acid, lactic acid, succinic acid, citric acid, methanesulfonic acid, trifluoromethanesulfonic acid, 10-camphor-sulfonic acid, benzenesulfonic acid and p-toluene.
- organic acids such as sulfonic acid
- inorganic acids such as hydrochloric acid, hydrobromic acid, hydroiodic acid, sulfuric acid, nitric acid, phosphoric acid and perchloric acid
- the acid catalyst preferably includes at least one (preferably any one) selected from the group consisting of acetic acid and hydrochloric acid, more preferably acetic acid.
- the amount of the acid catalyst used is 0.01 to 1 equivalent, preferably 0.1 to 0.6 equivalent, relative to the substrate.
- tetraalkoxymethane examples include tetramethoxymethane, tetraethoxymethane, tetrapropoxymethane, tetraisopropoxymethane, tetrabutoxymethane, tetraisobutoxymethane, tetra(sec-butoxy)methane, and tetra(tert-butoxy)methane.
- tetrapentoxymethane tetra(pentan-2-yloxy)methane, tetra[(3-methylbutan-2-yl)oxy]methane, tetra(tert-pentyloxy)methane, tetra(hexyloxy)methane, tetracyclopropoxy
- methane, tetracyclobutoxymethane, tetra(cyclopentyloxy)methane, tetra(cyclohexyloxy)methane, and the like can be used alone, or two or more of them can be used in combination at an appropriate ratio.
- the tetraalkoxymethane preferably includes at least one (preferably any one) selected from the group consisting of tetramethoxymethane, tetraethoxymethane and tetrabenzyloxymethane, more preferably tetraethoxymethane. mentioned.
- the amount of the tetraalkoxymethane used is 0.9 to 5 equivalents, preferably 1 to 2 equivalents, relative to the substrate.
- the reaction temperature of the cyclization reaction involving the alkoxy group is in the range of 0 to 200°C, preferably in the range of 50 to 150°C, more preferably in the range of 70 to 120°C.
- the reaction time of the cyclization reaction involving the alkoxy group is in the range of 5 minutes to 10 hours, preferably in the range of 10 minutes to 5 hours, more preferably in the range of 20 minutes to 3 hours. .
- substitution reaction In the production method of the present invention, the 2-alkoxy group (OR b ) of compound (2) (eg, compound (2-1), compound (2-11), or compound (2-21)) is preferably Substitution with tert-butyl 3,6-diazabicyclo[3.1.1]heptane-6-carboxylate yields compound B (e.g., compound (4), compound (5), compound (8)) through a substitution reaction. obtain.
- substitution reaction preferably, a substrate (here, compound (2)) and tert-butyl 3,6-diazabicyclo[3.1.1]heptane- 6-carboxylate, and the preferred conditions are as follows.
- acid catalysts include formic acid, acetic acid, trifluoroacetic acid, propionic acid, lactic acid, succinic acid, citric acid, methanesulfonic acid, trifluoromethanesulfonic acid, 10-camphor-sulfonic acid, benzenesulfonic acid and p-toluene.
- organic acids such as sulfonic acid
- inorganic acids such as hydrochloric acid, hydrobromic acid, hydroiodic acid, sulfuric acid, nitric acid, phosphoric acid and perchloric acid
- Lewis acids such as boron chloride, zinc chloride, stannic chloride, ferric chloride, aluminum chloride, titanium tetrachloride and zirconium tetrachloride, etc. alone or two or more in an appropriate ratio They can be mixed and used.
- the acid catalyst preferably includes at least one (preferably any one) selected from the group consisting of acetic acid and hydrochloric acid, more preferably acetic acid.
- the amount of the acid catalyst used is 0.01 to 1 equivalent, preferably 0.1 to 0.6 equivalent, relative to the substrate.
- the amount of tert-butyl 3,6-diazabicyclo[3.1.1]heptane-6-carboxylate used is 0.9 to 3 equivalents, preferably 1 to 1.5 equivalents.
- solvent examples include hydrocarbon organic solvents such as petroleum ether, n-pentane, n-hexane, n-heptane, cyclohexane, benzene, toluene and xylene; carbon tetrachloride, dichloromethane, chloroform, 1,2-dichloroethane.
- hydrocarbon organic solvents such as petroleum ether, n-pentane, n-hexane, n-heptane, cyclohexane, benzene, toluene and xylene
- carbon tetrachloride dichloromethane, chloroform, 1,2-dichloroethane.
- halogenated hydrocarbon organic solvents such as chlorobenzene; ether organic solvents such as diethyl ether, diisopropyl ether, methyl tert-butyl ether, methylcyclopentyl ether, tetrahydrofuran, 2-methyltetrahydrofuran, 1,4-dioxane and diphenyl ether; methyl acetate , ethyl acetate, n-propyl acetate, isopropyl acetate, n-butyl acetate, isobutyl acetate, tert-butyl acetate, benzyl acetate, methyl propionate, ethyl propionate, n-propyl propionate, isopropyl propionate, n-propionate ester-based organic solvents such as butyl, isobutyl propionate and tert-butyl propionate; and; Among aprotic polar
- the solvent is preferably n-hexane, n-heptane, toluene, xylene, methyl tert-butyl ether, 2-methyltetrahydrofuran, ethyl acetate, n-propyl acetate, isopropyl acetate, n-butyl acetate, isobutyl acetate and tert-acetate.
- the reaction temperature of the substitution reaction is in the range of 0 to 200°C, preferably in the range of 30 to 150°C, more preferably in the range of 60 to 130°C.
- the reaction time of the substitution reaction is in the range of 10 minutes to 10 hours, preferably in the range of 20 minutes to 5 hours, more preferably in the range of 30 minutes to 3 hours.
- cross-coupling reaction In the production method of the present invention, when R 3 of compound (2) or compound B is other than a thiazol-2-yl group, a thiazol-2-yl group is added here by a cross-coupling reaction, if necessary.
- Thiazole-2- is preferably added to the 7-position of compound (2) or compound B (e.g., compound (4), compound (2-1), compound (8)) by cross-coupling reaction in the presence of a metal catalyst.
- An yl group is introduced to obtain a compound B (eg, compound (5), compound (2-11), compound (9)) in which R 3 is a thiazol-2-yl group.
- the cross-coupling reaction includes Kumada-Tamao-Colew coupling reaction, Migita-Kosugi-Stille coupling reaction, Suzuki-Miyaura coupling reaction, Negishi coupling reaction, Buchwald-Hartwig coupling reaction, or Hiyama coupling reaction.
- a coupling reaction or the like can be used, preferably Kumada-Tamao-Collieu coupling reaction, Suzuki-Miyaura coupling reaction or Negishi coupling reaction can be used, and Negishi coupling reaction is more preferably used. can.
- the substrate here, compound (2) or compound B
- the substrate is preferably treated in an appropriate solvent in the presence of a metal catalyst, in the presence or absence of a ligand, in the presence of a base or It is carried out by reacting with 2-halothiazole (reacted with a reactant or as such, if necessary) in the absence, and the preferred conditions are as follows.
- the solvent examples include protic solvents such as water, methanol, ethanol, n-propanol, 2-propanol, n-butanol, 2-butanol and tert-butanol; petroleum ether, n-pentane, n-hexane, n- - hydrocarbon solvents such as heptane, cyclohexane, benzene, toluene and xylene; aromatic hydrocarbon solvents such as benzene, toluene and xylene; carbon tetrachloride, dichloromethane, chloroform, 1,2-dichloroethane, chlorobenzene and trifluoromethyl halogen solvents such as benzene; ether organic solvents such as diethyl ether, diisopropyl ether, methyl tert-butyl ether, methyl cyclopentyl ether, tetrahydrofuran, 2-methyltetrahydro
- the solvent is preferably at least one selected from the group consisting of water, ethanol, toluene, tetrahydrofuran, 1,4-dioxane and N,N-dimethylformamide, more preferably toluene, tetrahydrofuran and N, At least one selected from the group consisting of N-dimethylformamide can be used.
- 2-halothiazole represents a thiazole in which the 2nd position is substituted with a halogen atom, and the halogen atom includes a fluorine atom, a chlorine atom, a bromine atom or an iodine atom, preferably bromine. Atom or an iodine atom, more preferably a bromine atom.
- the above-mentioned reactant is for substituting the halogen atom of 2-halothiazole with another reactive functional group, and includes those that perform transmetallation reaction.
- Preferred examples of the reactant include a combination of a catalyst and a boron compound used in the Miyaura-Ishiyama boronation reaction, such as pinacol diborane, pinacol borane, and diboronic acid, Grignard reagent, zinc powder, and the like, and more preferably. includes zinc powder and the like.
- the amount of 2-halothiazole used is 1 to 20 equivalents, preferably 1 to 10 equivalents, relative to the substrate.
- metal catalyst examples include palladium metal, palladium (II) chloride, palladium (II) bromide, palladium (II) iodide, palladium (II) acetate, palladium (II) trifluoroacetate, and palladium (II) propionate.
- palladium (II) pivalate palladium (II) acetylacetonate, palladium (II) hexafluoroacetylacetonate, palladium (II) cyanide, palladium (II) sulfate, palladium (II) nitrate, palladium (II) oxide ), palladium ( ⁇ -cinnamyl) chloride dimer, palladium (II) [1,3-bis(diphenylphosphino)propane]bis(benzonitrile)bistetrafluoroborate, trans-bis(acetate)bis[o-( Di-o-tolylphosphino)benzyl]dipalladium(II), bis(acetonitrile)dichloropalladium(II), trans-bis(dicyclohexylamino)palladium(II) acetate, bis[(dicyclohexyl)(4-dimethylamin
- the metal catalyst is preferably palladium (II) acetate, [1,1′-bis(diphenylphosphino)ferrocene]dichloropalladium (II) dichloromethane adduct, bis(triphenylphosphine)dichloropalladium (II), tetrakis ( At least one (preferably any 1 type), more preferably at least one selected from the group consisting of palladium (II) acetate and [1,1′-bis(diphenylphosphino)ferrocene]dichloropalladium (II) dichloromethane adduct ( preferably any one).
- Examples of the ligand include trimethylphosphine, triethylphosphine, tributylphosphine, tri-tert-butylphosphine, tri-tert-butylphosphonium tetrafluoroborate, trioctylphosphine, tricyclohexylphosphine, tricyclohexylphosphine tetrafluoroborate.
- triphenylphosphine tri(o-tolyl)phosphine, tri(m-tolyl)phosphine, tri(p-tolyl)phosphine, tri(2-furyl)phosphine and 1,1'-bis (Diphenylphosphino) at least one (preferably any one) selected from the group consisting of ferrocene, more preferably tri(p-tolyl)phosphine and 1,1'-bis(diphenylphosphino) At least one (preferably any one) selected from the group consisting of ferrocene is included.
- Examples of the base include those listed in the above (partial substitution reaction), including preferred forms thereof.
- the amount of the metal catalyst used in the cross-coupling reaction is 0.01 to 20 mol%, preferably 0.1 to 15 mol%, relative to the total number of moles (excluding the solvent) of the charged raw material.
- each ratio of the metal catalyst and the ligand (metal catalyst: ligand) and the ratio of the metal catalyst and the base (metal catalyst: base) is molar
- the ratio is independently 1:0.25-20, preferably 1:1-5.
- the reaction temperature of the cross-coupling reaction is in the range of 0 to 200°C, preferably in the range of 30 to 150°C, more preferably in the range of 60 to 120°C.
- the reaction time of the cross-coupling reaction ranges from 1 minute to 48 hours, preferably from 15 minutes to 12 hours, more preferably from 30 minutes to 6 hours.
- the deprotection reaction can be a hydrolysis reaction, a deprotection reaction with a Lewis acid, or a deprotection reaction with an organic acid or the like, preferably a deprotection reaction with a Lewis acid and/or an organic acid. can be used, and more preferably a deprotection reaction with an organic acid can be used.
- compound B has a protecting group (for example, a benzyl group) on Ra, it is removed.
- the protecting group of R a is removed to give compound (3) by reacting compound B (eg, compound (5)) with an organic acid.
- Boc is removed by reacting compound C with an organic acid to obtain compound (1).
- the deprotection reaction is preferably carried out by reacting a substrate (here, compound (5) or compound C) with an organic acid in an appropriate solvent, and the preferred conditions are as follows.
- the solvent examples include hydrocarbon organic solvents such as petroleum ether, n-pentane, n-hexane, n-heptane, cyclohexane, benzene, toluene and xylene; carbon tetrachloride, dichloromethane, chloroform, 1,2-dichloroethane. and halogenated hydrocarbon-based organic solvents such as chlorobenzene; and; One of them can be used alone, or two or more of them can be used in combination at an appropriate ratio.
- hydrocarbon organic solvents such as petroleum ether, n-pentane, n-hexane, n-heptane, cyclohexane, benzene, toluene and xylene
- carbon tetrachloride dichloromethane, chloroform, 1,2-dichloroethane.
- halogenated hydrocarbon-based organic solvents such as chlorobenzene
- the solvent is preferably at least one selected from the group consisting of toluene, xylene and dichloromethane, more preferably at least one selected from the group consisting of toluene and dichloromethane.
- Examples of the organic acid include one selected from trifluoroacetic acid, trichloroacetic acid, dichloroacetic acid, chloroacetic acid, methanesulfonic acid, trifluoromethanesulfonic acid, 10-camphor-sulfonic acid, benzenesulfonic acid and p-toluenesulfonic acid.
- the seeds can be used singly or as a mixture of two or more species at an appropriate ratio.
- the organic acid is preferably trifluoroacetic acid.
- the amount of the organic acid used is 1 to 50 equivalents, preferably 5 to 20 equivalents, relative to the substrate.
- the reaction temperature of the deprotection reaction is in the range of 0 to 200°C, preferably in the range of 20 to 150°C.
- the reaction time for the deprotection reaction ranges from 5 minutes to 48 hours, preferably from 20 minutes to 24 hours.
- co-solvent examples include protic solvents such as water, methanol, ethanol, n-propanol, 2-propanol, n-butanol, 2-butanol and tert-butanol, petroleum ether, n-pentane, n-hexane, Hydrocarbon organic solvents such as n-heptane, cyclohexane, benzene, toluene and xylene; halogenated hydrocarbon organic solvents such as carbon tetrachloride, dichloromethane, chloroform, 1,2-dichloroethane and chlorobenzene; diethyl ether, diisopropyl ether, Ether organic solvents such as methyl tert-butyl ether, methyl cyclopentyl ether, tetrahydrofuran, 2-methyltetrahydrofuran, 1,4-dioxane and diphenyl ether; methyl acetate, e
- the solvent is preferably at least one selected from the group consisting of water, methanol, ethanol, n-propanol, 2-propanol, dichloromethane, chloroform and ethyl acetate, more preferably water, methanol and dichloromethane. At least one selected from the group consisting of
- salts such as lithium oxide, sodium hydroxide, potassium hydroxide and barium hydroxide; ammonia, methylamine, ethylamine, cyclohexylamine, ethanolamine, aniline, dimethylamine, diethylamine, dibutylamine, dicyclohexylamine, bistrimethylsilylamine, pyrrolidine, piperidine, piperazine, morpholine, trimethylamine, triethylamine, tributylamine, diisopropylethylamine, 2-(dimethylamino)ethanol, N-methylpyrrolidine, N-methylpiperidine, N-methylmorpholine, N,N'-dimethylpiperazine, N,N , N′,N′-tetramethylethylenediamine,
- sodium hydrogen carbonate, sodium carbonate, potassium hydrogen carbonate, potassium carbonate, sodium hydroxide, potassium hydroxide, acetic acid, trifluoroacetic acid, methanesulfonic acid, hydrochloric acid, sulfuric acid and nitric acid are preferred.
- the pH of the reaction mixture is adjusted to about 6.8 to 12.0, preferably about 7.0 to 9.5.
- Di-tert-butyl dicarbonate is used in an amount of 0.9-5 equivalents, preferably 1-2 equivalents, relative to the substrate.
- the reaction temperature of the protection reaction is in the range of 0 to 100°C, preferably in the range of 10 to 80°C, more preferably in the range of 20 to 60°C.
- the reaction time of the protection reaction is in the range of 10 minutes to 24 hours, preferably in the range of 20 minutes to 12 hours, more preferably in the range of 30 minutes to 6 hours.
- a method of removing halogen atoms by transmetalation reaction or reduction reaction can be used as the conversion reaction of halogen atoms to hydrogen atoms, preferably catalytic hydrogenation or reduction reaction with metals. can be used, and more preferably a reduction reaction with metals can be used.
- compound (3) is obtained by converting the halogen atom of Xa into a hydrogen atom by reacting compound B (for example, compound (9)) with a metal.
- the conversion reaction is preferably carried out by reacting a substrate (here, compound B) with metals in the presence or absence of an acid or base in an appropriate solvent, and the preferred conditions are as follows. is.
- the solvent examples include protic solvents such as water, methanol, ethanol, n-propanol, 2-propanol, n-butanol, 2-butanol and tert-butanol; petroleum ether, n-pentane, n-hexane, n- - hydrocarbon solvents such as heptane, cyclohexane, benzene, toluene and xylene; aromatic hydrocarbon solvents such as benzene, toluene and xylene; diethyl ether, diisopropyl ether, methyl tert-butyl ether, methyl cyclopentyl ether, tetrahydrofuran, 2- Ether-based organic solvents such as methyltetrahydrofuran, 1,4-dioxane, 1,2-dimethoxyethane and diphenyl ether; methyl acetate, ethyl acetate, n-prop
- the solvent is preferably at least one selected from the group consisting of water, methanol, ethanol, n-propanol, 2-propanol, tetrahydrofuran and 1,4-dioxane, more preferably water, 1,4 - At least one selected from the group consisting of dioxane and ethanol.
- Examples of the acid include mineral acids such as hydrochloric acid, hydrobromic acid, hydroiodic acid, sulfuric acid, phosphoric acid and nitric acid; carboxylic acids such as formic acid, acetic acid, propionic acid and trifluoroacetic acid; One of carboxylic acid ammonium salts such as ammonium formate and ammonium acetate can be used alone, or two or more of them can be used in combination at an appropriate ratio.
- mineral acids such as hydrochloric acid, hydrobromic acid, hydroiodic acid, sulfuric acid, phosphoric acid and nitric acid
- carboxylic acids such as formic acid, acetic acid, propionic acid and trifluoroacetic acid
- carboxylic acid ammonium salts such as ammonium formate and ammonium acetate can be used alone, or two or more of them can be used in combination at an appropriate ratio.
- Examples of the base include sodium hydrogen carbonate, sodium carbonate, potassium hydrogen carbonate, potassium carbonate, cesium carbonate, sodium acetate, potassium acetate, sodium phosphate, potassium phosphate, lithium hydroxide, sodium hydroxide, potassium hydroxide and Salts such as barium hydroxide; ammonia, methylamine, ethylamine, cyclohexylamine, ethanolamine, aniline, dimethylamine, diethylamine, dibutylamine, dicyclohexylamine, bistrimethylsilylamine, pyrrolidine, piperidine, piperazine, morpholine, trimethylamine, triethylamine, tri butylamine, diisopropylethylamine, 2-(dimethylamino)ethanol, N-methylpyrrolidine, N-methylpiperidine, N-methylmorpholine, N,N'-dimethylpiperazine, N,N,N',N'-tetramethylethylenediamine, N,N-dimethylani
- the base is preferably at least one selected from the group consisting of sodium hydroxide, potassium hydroxide, ammonium formate or ammonium acetate, more preferably selected from the group consisting of sodium hydroxide or ammonium formate. At least 1 type is mentioned.
- the amount of the acid or base used in the conversion reaction is 10 to 50 equivalents, preferably 20 to 40 equivalents, more preferably 20 to 30 equivalents, relative to the substrate.
- one of samarium (II) iodide, ytterbium (III) iodide, aluminum, zinc, iron, tin, samarium, ytterbium, etc. may be used alone or in combination of two or more. It can be used by mixing at a ratio of
- the metals preferably include at least one (preferably any one) selected from the group consisting of zinc and iron, more preferably zinc.
- the amount of the metals used in the conversion reaction is 10 to 50 equivalents, preferably 20 to 40 equivalents, more preferably 20 to 30 equivalents, relative to the substrate.
- the reaction temperature of the conversion reaction is in the range of 0 to 200°C, preferably in the range of 30 to 150°C, more preferably in the range of 60 to 120°C.
- the reaction time of the conversion reaction is in the range of 30 minutes to 24 hours, preferably in the range of 1 hour to 12 hours, more preferably in the range of 2 hours to 6 hours.
- compound C is preferably obtained by dialkylating the hydroxyl group at the 4-position of compound (3) by an O-alkylation reaction.
- the substrate here, compound (3)
- the substrate is preferably reacted with ethyl 2-bromo-2,2-difluoroacetate in the presence or absence of a base in a suitable solvent.
- dialkylation with an organometallic reagent and the preferred conditions are as follows.
- the solvent examples include protic solvents such as water, methanol, ethanol, n-propanol, 2-propanol, n-butanol, 2-butanol and tert-butanol; petroleum ether, n-pentane, n-hexane, n- - hydrocarbon solvents such as heptane, cyclohexane, benzene, toluene and xylene; diethyl ether, diisopropyl ether, methyl tert-butyl ether, methyl cyclopentyl ether, tetrahydrofuran, 2-methyltetrahydrofuran, 1,4-dioxane, 1,2-dimethoxy Ether-based organic solvents such as ethane and diphenyl ether; methyl acetate, ethyl acetate, n-propyl acetate, isopropyl acetate, n-butyl a
- the solvent is preferably at least one selected from the group consisting of methanol, ethanol, toluene, tetrahydrofuran, ethyl acetate, acetonitrile and N,N-dimethylformamide, more preferably acetonitrile and N,N-dimethyl At least one selected from the group consisting of formamide is included.
- Examples of the base include sodium hydrogen carbonate, sodium carbonate, potassium hydrogen carbonate, potassium carbonate, cesium carbonate, sodium acetate, potassium acetate, sodium phosphate, phosphorus, potassium, lithium hydroxide, sodium hydroxide, potassium hydroxide and Salts such as barium hydroxide; trimethylamine, triethylamine, tributylamine, diisopropylethylamine, 2-(dimethylamino)ethanol, N-methylpyrrolidine, N-methylpiperidine, N-methylmorpholine, N,N'-dimethylpiperazine, N, N,N',N'-tetramethylethylenediamine, N,N-dimethylaniline, 1,4-diazabicyclo[2.2.2]octane, 1,5-diazabicyclo[4.3.0]non-5-ene , 1,8-diazabicyclo[5.4.0]undec-7-ene, pyridine, picoline, 4-(dimethylamino)
- the base is preferably at least one selected from the group consisting of sodium carbonate, potassium carbonate, triethylamine, 1,8-diazabicyclo[5.4.0]undec-7-ene, sodium hydride and sodium tert-butoxide. and more preferably at least one selected from the group consisting of 1,8-diazabicyclo[5.4.0]undec-7-ene and sodium tert-butoxide.
- the amount of the base used is 1 to 20 equivalents, preferably 2 to 5 equivalents, relative to the substrate. is.
- the amount of ethyl 2-bromo-2,2-difluoroacetate used is 1 to 10 equivalents, preferably 2 to 6 equivalents, relative to the substrate.
- the reaction temperature of the O-alkylation reaction is in the range of 0 to 100°C, preferably in the range of 10 to 60°C, more preferably is in the range of 15-40°C.
- reaction time of the O-alkylation reaction ranges from 5 minutes to 24 hours, preferably from 10 minutes to 12 hours, More preferably, it ranges from 20 minutes to 6 hours.
- organometallic reagent examples include one selected from organomagnesium reagents, organolithium reagents, organozinc reagents, organoboron reagents, organotin reagents, organosilicon reagents, organobismuth reagents, organogermanium reagents, and organomercury reagents. can be used alone or in admixture of two or more at an appropriate ratio.
- the organometallic reagent is preferably at least one (preferably any one) selected from the group consisting of an organomagnesium reagent, an organolithium reagent, and an organozinc reagent, more preferably an organomagnesium reagent. be done.
- the amount of the organometallic reagent used is 2 to 10 equivalents, preferably 2.5 to 5 equivalents, relative to the substrate.
- the reaction temperature of the O-alkylation reaction is in the range of 0 to 100°C, preferably in the range of 10 to 60°C, more preferably in the range of 15 to 40°C. is.
- reaction time of the O-alkylation reaction ranges from 5 minutes to 24 hours, preferably from 10 minutes to 12 hours, more preferably from 20 minutes to 6 hours. time range.
- M mol/L 1 H-NMR: Results of proton nuclear magnetic resonance spectrum of the obtained compound Pd--C: palladium catalyst supported on activated carbon THF: tetrahydrofuran DMF: N,N-dimethylformamide DMSO: dimethylsulfoxide Boc: tert-butoxycarbonyl group (Boc) 2 O: di-tert-butyl dicarbonate Bn: benzyl group.
- the obtained organic layer was concentrated while replacing with acetonitrile to obtain 211 mL of acetonitrile solution.
- Acetonitrile (211 mL), N-bromosuccinimide (88.53 g, 497.4 mmol) and acetic acid (4.75 mL, 83.1 mmol) were added to the resulting solution, and after cooling to 10°C or below, chlorotrimethylsilane (18 .02 g, 165.9 mmol) was added, and the mixture was stirred at 10° C. or lower for 2 hours to obtain a reaction solution containing a compound represented by the above formula (10-12) in which R 2 was a fluorine atom.
- Zinc powder (6.47 g, 98.9 mmol) was suspended in DMF (22.5 mL), chlorotrimethylsilane (0.6 mL, 4.7 mmol) was added, and the mixture was stirred at 60°C for 1 hour.
- reaction solution was cooled to around 0° C., pre-cooled toluene (750 mL) and 0.3 M hydrochloric acid were added and stirred, and the aqueous layer was removed.
- the resulting organic layer was washed twice with water (250 mL), added with magnesium sulfate (5 g), and then filtered. The filtrate was concentrated under reduced pressure to 250 mL, toluene (250 mL) was added, and then concentrated under reduced pressure to 250 mL.
- the resulting solution was cooled to 5° C., 1.08 M methylmagnesium bromide THF solution (336 mL, 361.9 mmol) was added and stirred at room temperature for 2 hours.
- reaction solution was cooled to around 0° C., toluene (500 mL) and 1M hydrochloric acid (500 ml) were added and stirred, and the aqueous layer was removed.
- the obtained organic layer was washed with 0.1 M sodium hydroxide aqueous solution (500 mL), 10% potassium hydrogensulfate aqueous solution (500 mL) and water (500 mL) in that order, and then concentrated under reduced pressure to 250 mL.
- Activated carbon (5 g) was added to the obtained solution, and the mixture was stirred at 60° C. for 1 hour and filtered through celite.
- Zinc powder (1.57 g, 24.0 mmol) was suspended in DMF (15 mL), chlorotrimethylsilane (0.25 mL, 2.0 mmol) was added, and the mixture was stirred at 50°C for 1 hour.
- the reaction solution was heated to 60° C., 2-bromothiazole (1.8 mL, 20.3 mmol) was added and stirred, and then the 4-benzyloxy-7-bromo-2-ethoxybenzo [ d]oxazole (3.48 g, 10.0 mmol), [1,1′-bis(diphenylphosphino)ferrocene]dichloropalladium(II) dichloromethane adduct (0.24 g, 0.29 mmol) and DMF (10 mL).
- 2-Nitroresorcinol (5.0 g, 32.235 mmol) was dissolved in ethyl acetate (50 mL), 10% Pd—C (PEtype) (0.25 g) was added, and the mixture was vigorously stirred at room temperature for 1.5 hours under hydrogen atmosphere. to obtain a reaction solution containing 2-aminoresorcinol.
- the reaction solution was filtered through celite, the filter residue was washed with ethyl acetate (30 mL was divided into several portions), and the filtrate was concentrated under reduced pressure to 50 mL.
- the resulting solid was dissolved in THF (90 mL) and concentrated under reduced pressure to 48 mL. Addition of ethyl acetate (63 mL) and concentration under reduced pressure to 48 mL were repeated three times.
- the resulting solution was stirred at 60° C. for 30 minutes, cooled to room temperature, and aged for 1 hour under ice cooling.
- the resulting solid was collected by filtration, washed with cold ethyl acetate (18 mL divided into several portions), and dried under reduced pressure to obtain 7.77 g of the title compound (yield 84.8%).
- Lithium chloride anhydrous (2.22 g, 51.11 mmol) and zinc powder (5.01 g, 76.65 mmol) were suspended in THF (10 mL) and chlorotrimethylsilane (0.45 mL, 3.58 mmol) was added under a nitrogen atmosphere. , and stirred vigorously at 60° C. for 2 hours.
- 2-bromothiazole (4.53 mL, 51.11 mmol) was slowly added dropwise to the tert-butyl 3-(5,7-dibromo-4-hydroxybenzo[d]oxazol-2-yl) obtained in Synthesis Example 2.
- the aqueous layer was separated, and the resulting organic layer was washed with a mixed solution of DMF (50 mL) and 1.8 M sulfuric acid aqueous solution (50 mL).
- the resulting aqueous layer was combined with the previous aqueous layer and re-extracted with a mixed solution of chloroform (40 mL) and toluene (20 mL).
- the obtained organic layer was combined with the previous organic layer and washed twice with water (100 mL).
- Activated carbon (0.5 g) and 20% aqueous sodium hydrogen sulfite solution (100 mL) were added to the organic layer, and the mixture was stirred at 60° C. for 1 hour.
- the compound (2) according to the present invention does not require highly toxic and difficult-to-handle reagents or highly dangerous operations, and can be produced by a method that does not generate toxic substances during the reaction. Furthermore, the production of compound (1) or a salt thereof using this does not require highly toxic and difficult-to-handle reagents or highly dangerous operations.
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Abstract
Description
[1]
式(2):
Raは、水素原子又は置換されていてもよいアリールメチル基を示し、
Rbは、置換されていてもよいアルキル基又は環状アルキル基を示し、
R3は、水素原子、ハロゲン原子又はチアゾール-2-イル基を示し、
Xaは、水素原子又はハロゲン原子を示す。]
で表される化合物又はその塩を用いて、式(3):
で表される化合物又はその塩を製造する工程Bと、
前記式(3)で表される化合物又はその塩を用いて、式(1):
を含む、前記式(1)で表される化合物又はその塩の製造方法。
[2]
前記工程Bが、
前記式(2)中、Raが置換されていてもよいアリールメチル基であり、Rbが置換されていてもよいアルキル基であり、R3がハロゲン原子であり、Xaが水素原子である化合物(2-1)のORbを、tert-ブチル 3,6-ジアザビシクロ[3.1.1]ヘプタン-6-カルボキシレートで置換して式(4):
で表される化合物とし、
前記式(4)で表される化合物に、金属触媒存在下で交差カップリング反応によりチアゾール-2-イル基を導入して式(5):
で表される化合物とし、
前記式(5)で表される化合物と有機酸とを反応させることにより、前記式(3)で表される化合物又はその塩を製造する工程である、[1]に記載の製造方法。
[3]
前記工程Bが、
前記式(2)中、Raが置換されていてもよいアリールメチル基であり、Rbが置換されていてもよいアルキル基であり、R3がハロゲン原子であり、Xaが水素原子である化合物(2-1)に、金属触媒存在下で交差カップリング反応によりチアゾール-2-イル基を導入して、前記式(2)中、Raが置換されていてもよいアリールメチル基であり、Rbが置換されていてもよいアルキル基であり、R3がチアゾール-2-イル基であり、Xaが水素原子である化合物(2-11)とし、
化合物(2-11)のORbを、tert-ブチル 3,6-ジアザビシクロ[3.1.1]ヘプタン-6-カルボキシレートで置換して式(5):
で表される化合物とし、
前記式(5)で表される化合物と有機酸とを反応させることにより、前記式(3)で表される化合物又はその塩を製造する工程である、[1]に記載の製造方法。
[4]
前記工程Bが、
前記式(2)中、Raが水素原子であり、Rbが置換されていてもよいアルキル基であり、R3が水素原子であり、Xaが水素原子である化合物(2-2)と臭素化剤とを反応させ、前記式(2)中、Raが水素原子であり、Rbが置換されていてもよいアルキル基であり、R3が臭素原子であり、Xaが臭素原子である化合物(2-21)とし、
化合物(2-21)のORbを、tert-ブチル 3,6-ジアザビシクロ[3.1.1]ヘプタン-6-カルボキシレートで置換して、式(8):
で表される化合物とし、
前記式(8)で表される化合物に、金属触媒存在下で交差カップリング反応によりチアゾール-2-イル基を導入して、式(9):
で表される化合物とし、
前記式(9)で表される化合物と金属類とを反応させることにより、前記式(3)で表される化合物又はその塩を製造する工程である、[1]に記載の製造方法。
[5]
式(10):
R1は、水酸基又はハロゲン原子又はアリールメチルオキシ基を示し、
R2は、水酸基又はハロゲン原子を示し、
R3は、水素原子、ハロゲン原子又はチアゾール-2-イル基を示す。]
で表される化合物又はその塩を用いて、前記式(2)で表される化合物又はその塩を製造する工程Aを含む、[1]~[4]のうちのいずれか一項に記載の製造方法。
[6]
前記工程Aが、
前記式(10)中、R1がハロゲン原子であり、R2がハロゲン原子でありR3が水素原子である化合物(10-1)とベンジルアルコールとを反応させ、式(10-11):
で表される化合物とし、
前記式(10-11)で表される化合物と臭素化剤とを反応させ、式(10-12):
で表される化合物とし、
前記式(10-12)で表される化合物とアルカリ水溶液とを反応させ、式(10-13):
で表される化合物とし、
前記式(10-13)で表される化合物と還元剤とを反応させ、式(14):
で表される化合物とし、
前記式(14)で表される化合物とテトラアルコキシメタンとを酸触媒存在下で反応させることにより、前記式(2)で表される化合物又はその塩を製造する工程である、[5]に記載の製造方法。
[7]
前記工程Aが、
前記式(10)中、R1が水酸基であり、R2が水酸基であり、R3が水素原子である化合物(10-2)を還元した後に酸触媒存在下でテトラアルコキシメタンと反応させ、次いで、臭素化剤と反応させることにより、前記式(2)で表される化合物又はその塩を製造する工程である、[5]に記載の製造方法。
[8]
式(15):
で表される化合物又はその塩。
[9]
式(6):
で表される化合物又はその塩。
[10]
式(7):
で表される化合物又はその塩。
[11]
式(8):
で表される化合物又はその塩。
で表されるtert-ブチル 3-(4-ヒドロキシ-7-(チアゾール-2-イル)ベンゾ[d]オキサゾール-2-イル)-3,6-ジアザビシクロ[3.1.1]ヘプタン-6-カルボキシレート(以下、場合により「化合物(3)」という)又はその塩を用いて得ることができる。このような化合物(3)から化合物(1)を得る方法としては、適宜公知の方法又はそれに準じた方法を採用することができ、例えば、特許文献1に記載の方法を用いることができる。化合物(3)の塩としては、その好ましい形態も含めて、化合物(1)の塩として挙げたものと同様のものが挙げられる。
2-メトキシベンゾ[d]オキサゾール-4-オール、2-エトキシベンゾ[d]オキサゾール-4-オール、2-プロポキシベンゾ[d]オキサゾール-4-オール、2-イソプロポキシベンゾ[d]オキサゾール-4-オール、2-ブトキシベンゾ[d]オキサゾール-4-オール、2-イソブトキシベンゾ[d]オキサゾール-4-オール、2-(sec-ブトキシ)ベンゾ[d]オキサゾール-4-オール、2-(tert-ブトキシ)ベンゾ[d]オキサゾール-4-オール、2-ペントキシベンゾ[d]オキサゾール-4-オール、2-(ペンタン-2-イルオキシ)ベンゾ[d]オキサゾール-4-オール、2-[(3-メチルブタン-2-イル)オキシ]ベンゾ[d]オキサゾール-4-オール、2-(tert-ペンチルオキシ)ベンゾ[d]オキサゾール-4-オール、2-(ヘキシルオキシ)ベンゾ[d]オキサゾール-4-オール、2-シクロプロポキシベンゾ[d]オキサゾール-4-オール、2-シクロブトキシベンゾ[d]オキサゾール-4-オール、2-(シクロペンチルオキシ)ベンゾ[d]オキサゾール-4-オール、2-(シクロヘキシルオキシ)ベンゾ[d]オキサゾール-4-オール、2-ベンジルオキシベンゾ[d]オキサゾール-4-オール、5,7-ジブロモ-2-メトキシベンゾ[d]オキサゾール-4-オール、5,7-ジブロモ-2-エトキシベンゾ[d]オキサゾール-4-オール、5,7-ジブロモ-2-プロポキシベンゾ[d]オキサゾール-4-オール、5,7-ジブロモ-2-ブトキシベンゾ[d]オキサゾール-4-オール、5,7-ジブロモ-2-イソブトキシベンゾ[d]オキサゾール-4-オール、5,7-ジブロモ-2-(sec-ブトキシ)ベンゾ[d]オキサゾール-4-オール、5,7-ジブロモ-2-(tert-ブトキシ)ベンゾ[d]オキサゾール-4-オール、5,7-ジブロモ-2-ペントキシベンゾ[d]オキサゾール-4-オール、5,7-ジブロモ-2-(ペンタン-2-イルオキシ)ベンゾ[d]オキサゾール-4-オール、5,7-ジブロモ-2-[(3-メチルブタン-2-イル)オキシ]ベンゾ[d]オキサゾール-4-オール、5,7-ジブロモ-2-(tert-ペンチルオキシ)ベンゾ[d]オキサゾール-4-オール、5,7-ジブロモ-2-(ヘキシルオキシ)ベンゾ[d]オキサゾール-4-オール、5,7-ジブロモ-2-シクロプロポキシベンゾ[d]オキサゾール-4-オール、5,7-ジブロモ-2-シクロブトキシベンゾ[d]オキサゾール-4-オール、5,7-ジブロモ-2-シクロブトキシベンゾ[d]オキサゾール-4-オール、5,7-ジブロモ-2-(シクロペンチルオキシ)ベンゾ[d]オキサゾール-4-オール、5,7-ジブロモ-2-(シクロヘキシルオキシ)ベンゾ[d]オキサゾール-4-オール、5,7-ジブロモ-2-ベンジルオキシベンゾ[d]オキサゾール-4-オール、4-(ベンジルオキシ)-7-ブロモ-2-メトキシベンゾ[d]オキサゾール、4-(ベンジルオキシ)-7-ブロモ-2-エトキシベンゾ[d]オキサゾール、4-(ベンジルオキシ)-7-ブロモ-2-プロポキシベンゾ[d]オキサゾール、4-(ベンジルオキシ)-7-ブロモ-2-イソプロポキシベンゾ[d]オキサゾール、4-(ベンジルオキシ)-7-ブロモ-2-ブトキシベンゾ[d]オキサゾール、4-(ベンジルオキシ)-7-ブロモ-2-イソブトキシベンゾ[d]オキサゾール、4-(ベンジルオキシ)-7-ブロモ-2-(sec-ブトキシ)ベンゾ[d]オキサゾール、4-(ベンジルオキシ)-7-ブロモ-2-(tert-ブトキシ)ベンゾ[d]オキサゾール、4-(ベンジルオキシ)-7-ブロモ-2-ペントキシベンゾ[d]オキサゾール、4-(ベンジルオキシ)-7-ブロモ-2-(ペンタン-2-イルオキシ)ベンゾ[d]オキサゾール、4-(ベンジルオキシ)-7-ブロモ-2-[(3-メチルブタン-2-イル)オキシ]ベンゾ[d]オキサゾール、4-(ベンジルオキシ)-7-ブロモ-2-(tert-ペンチルオキシ)ベンゾ[d]オキサゾール、4-(ベンジルオキシ)-7-ブロモ-2-(ヘキシルオキシ)ベンゾ[d]オキサゾール、4-(ベンジルオキシ)-7-ブロモ-2-シクロプロポキシベンゾ[d]オキサゾール、4-(ベンジルオキシ)-7-ブロモ-2-シクロブトキシベンゾ[d]オキサゾール、4-(ベンジルオキシ)-7-ブロモ-2-(シクロペンチルオキシ)ベンゾ[d]オキサゾール、4-(ベンジルオキシ)-7-ブロモ-2-(シクロヘキシルオキシ)ベンゾ[d]オキサゾール、2,4-ジ(ベンジルオキシ)-7-ブロモベンゾ[d]オキサゾール、4-(ベンジルオキシ)-2-メトキシ-7-(チアゾール-2-イル)ベンゾ[d]オキサゾール、4-(ベンジルオキシ)-2-エトキシ-7-(チアゾール-2-イル)ベンゾ[d]オキサゾール、4-(ベンジルオキシ)-2-プロポキシ-7-(チアゾール-2-イル)ベンゾ[d]オキサゾール、4-(ベンジルオキシ)-2-イソプロポキシ-7-(チアゾール-2-イル)ベンゾ[d]オキサゾール、4-(ベンジルオキシ)-2-ブトキシ-7-(チアゾール-2-イル)ベンゾ[d]オキサゾール、4-(ベンジルオキシ)-2-イソブトキシ-7-(チアゾール-2-イル)ベンゾ[d]オキサゾール、4-(ベンジルオキシ)-2-(sec-ブトキシ)-7-(チアゾール-2-イル)ベンゾ[d]オキサゾール、4-(ベンジルオキシ)-2-(tert-ブトキシ)-7-(チアゾール-2-イル)ベンゾ[d]オキサゾール、4-(ベンジルオキシ)-2-ペントキシ-7-(チアゾール-2-イル)ベンゾ[d]オキサゾール、4-(ベンジルオキシ)-2-(ペンタン-2-イルオキシ)-7-(チアゾール-2-イル)ベンゾ[d]オキサゾール、4-(ベンジルオキシ)-2-[(3-メチルブタン-2-イル)オキシ]-7-(チアゾール-2-イル)ベンゾ[d]オキサゾール、4-(ベンジルオキシ)-2-(tert-ペンチルオキシ)-7-(チアゾール-2-イル)ベンゾ[d]オキサゾール、4-(ベンジルオキシ)-2-(ヘキシルオキシ)-7-(チアゾール-2-イル)ベンゾ[d]オキサゾール、4-(ベンジルオキシ)-2-シクロプロポキシ-7-(チアゾール-2-イル)ベンゾ[d]オキサゾール、4-(ベンジルオキシ)-2-シクロブトキシ-7-(チアゾール-2-イル)ベンゾ[d]オキサゾール、4-(ベンジルオキシ)-2-(シクロペンチルオキシ)-7-(チアゾール-2-イル)ベンゾ[d]オキサゾール、4-(ベンジルオキシ)-2-(シクロヘキシルオキシ)-7-(チアゾール-2-イル)ベンゾ[d]オキサゾール及び2,4-ジ(ベンジルオキシ)-7-(チアゾール-2-イル)ベンゾ[d]オキサゾール
が挙げられるが、本発明はこれらの特定の例に限定されるものではない。
で表される5,7-ジブロモ-2-エトキシベンゾ[d]オキサゾール-4-オール、次式(15):
で表される4-(ベンジルオキシ)-7-ブロモ-2-エトキシベンゾ[d]オキサゾール、及び次式(6):
で表される4-(ベンジルオキシ)-2-エトキシ-7-(チアゾール-2-イル)ベンゾ[d]オキサゾールである。
スキーム1:
本発明の製造方法では、好ましくは、化合物(10-1)をベンジルアルコールと反応させることにより、部分置換反応によって化合物(10-11)を得る。前記部分置換反応として好ましくは、基質(ここでは、化合物(10-1))を、適当な溶媒中、塩基の存在下又は非存在下で、ベンジルアルコールと反応させて行われ、その好ましい条件は以下のとおりである。
本発明の製造方法では、好ましくは、化合物(2-2)と臭素化剤とを反応させることにより、臭素化反応によって化合物(2-21)を得る。また、化合物(10-11)と臭素化剤とを反応させることにより、臭素化反応によって化合物(10-12)を得る。さらに、化合物(10-22)と臭素化剤とを反応させることにより、臭素化反応によって化合物(2)を得る。前記臭素化反応として好ましくは、基質(ここでは、化合物(2-2)、化合物(10-11)又は化合物(10-22))に、適当な溶媒中、酸触媒の存在下又は非存在下で、臭素化剤を反応させて行われ、その好ましい条件は以下のとおりである。
本発明の製造方法では、好ましくは、化合物(10-12)とアルカリ溶液とを反応させることにより、水和反応によって化合物(10-13)を得る。前記水和反応として好ましくは、基質(ここでは、化合物(10-12))に、適当な溶媒中、アルカリ水溶液を反応させて行われ、その好ましい条件は以下のとおりである。
本発明の製造方法では、好ましくは、化合物(10-13)と還元剤とを反応させることにより、還元反応によって化合物(14)を得る。また、化合物(10-2)と還元剤とを反応させることにより、還元反応によって化合物(10-21)を得る。前記還元反応として好ましくは、基質(ここでは、化合物(10-13)、化合物(10-2))に、適当な溶媒中、還元剤を反応させて行われ、その好ましい条件は以下のとおりである。
本発明の製造方法では、好ましくは、化合物(14)とテトラアルコキシメタンとを反応させることにより、アルコキシ基を伴った環化反応により、化合物(2)を得る。また、化合物(10-21)とテトラアルコキシメタンとを反応させることにより、アルコキシ基を伴った環化反応により、化合物(10-22)を得る。
本発明の製造方法では、好ましくは、化合物(2)(例えば、化合物(2-1)、化合物(2-11)、又は化合物(2-21))の2-アルコキシ基(ORb)を、tert-ブチル 3,6-ジアザビシクロ[3.1.1]ヘプタン-6-カルボキシレートで置換して、置換反応により化合物B(例えば、化合物(4)、化合物(5)、化合物(8))を得る。前記置換反応として好ましくは、適当な溶媒中、酸触媒存在下又は非存在下で、基質(ここでは、化合物(2))とtert-ブチル 3,6-ジアザビシクロ[3.1.1]ヘプタン-6-カルボキシレートとを反応させて行われ、その好ましい条件は以下のとおりである。
本発明の製造方法において、化合物(2)又は化合物BのR3がチアゾール-2-イル基以外である場合には、必要に応じて、交差カップリング反応により、ここにチアゾール-2-イル基を導入する。好ましくは、化合物(2)又は化合物B(例えば、化合物(4)、化合物(2-1)、化合物(8))の第7位に、金属触媒存在下で交差カップリング反応によりチアゾール-2-イル基を導入して、R3がチアゾール-2-イル基である化合物B(例えば、化合物(5)、化合物(2-11)、化合物(9))を得る。
本発明の製造方法において、脱保護反応としては、加水素分解反応、ルイス酸による脱保護反応又は有機酸等による脱保護反応が使用でき、好ましくは、ルイス酸及び/又は有機酸による脱保護反応が使用でき、より好ましくは、有機酸による脱保護反応が使用できる。
なお、上記のスキーム1の条件では、化合物Bに対する前記脱保護反応により、同化合物Bの保護基であるN-Bocも脱落し、化合物(3)の遊離塩基体が生成するので、再度Bocをかけなおす(Bocで置換して保護する)ことが好ましい。この場合には、化合物(3)の遊離塩基体を単離した後、当業者が知り得る一般的な方法で再度Bocをかけなおすことができ、又は、上記脱保護反応が終了した後の反応混合物を中性~塩基性に調整して、これを、適当な補助溶媒の存在下若しくは非存在下、前記反応混合物中の基質(ここでは、化合物(3)の遊離塩基体)と二炭酸ジ-tert-ブチルとを反応させて行うことができ、好ましくは、後者の方法である。後者の保護反応の好ましい条件は以下のとおりである。
本発明の製造方法において、ハロゲン原子の水素原子への変換反応としては、トランスメタル化反応又は還元反応等によってハロゲン原子を除去する方法が使用でき、好ましくは、接触水素化又は金属類による還元反応が使用でき、より好ましくは、金属類による還元反応が使用できる。
本発明の製造方法では、好ましくは、化合物(3)の第4位の水酸基をO-アルキル化反応によってジアルキル化することにより、化合物Cを得る。前記O-アルキル化反応として好ましくは、基質(ここでは、化合物(3))を、適当な溶媒中、塩基の存在下又は非存在下で、エチル 2-ブロモ-2,2-ジフルオロアセテートと反応させ、その後、有機金属試薬によってジアルキル化することで行われ、その好ましい条件は以下のとおりである。
M:mol/L
1H-NMR:得られた化合物のプロトン核磁気共鳴スペクトルの結果
Pd-C:活性炭担持パラジウム触媒
THF:テトラヒドロフラン
DMF:N,N-ジメチルホルムアミド
DMSO:ジメチルスルホキシド
Boc:tert-ブトキシカルボニル基
(Boc)2O:二炭酸ジ-tert-ブチル
Bn:ベンジル基。
[合成例1] 3-ベンジルオキシ-6-ブロモ-2-ニトロフェノール
合成例7で得られた1-{[2-(3,6-ジアザビシクロ[3.1.1]ヘプタン-3-イル)-7-(1,3-チアゾールー2-イル)-1,3-ベンゾオキサゾール-4-イル]オキシ}-1,1-ジフルオロ-2-メチルプロパン-2-オールの粗結晶(20g)を85%エタノール水溶液(300mL)に溶解した。この溶解液を70℃に加熱し、粗結晶の溶解を確認した後、40℃に冷却し、ろ過した。このろ液を100mLまで減圧濃縮し、エタノール(100mL)を加えた後、100mLまで減圧濃縮し、その後同操作を2回行った。この濃縮液を0℃にて終夜撹拌し、固体を析出させた。生じた固体をろ取し、あらかじめ冷却したエタノール(40mL)で洗浄し、減圧乾燥後、1-{[2-(3,6-ジアザビシクロ[3.1.1]ヘプタン-3-イル)-7-(1,3-チアゾールー2-イル)-1,3-ベンゾオキサゾール-4-イル]オキシ}-1,1-ジフルオロ-2-メチルプロパン-2-オール再結晶体17.8g(89.0%収率)を得た。
[合成例1] 4-ベンジルオキシ-7‐ブロモ-2-エトキシベンゾ[d]オキサゾール
[合成例1] 5,7-ジブロモ-2-エトキシベンゾ[d]オキサゾール-4-オール
Claims (11)
- 前記工程Bが、
前記式(2)中、Raが置換されていてもよいアリールメチル基であり、Rbが置換されていてもよいアルキル基であり、R3がハロゲン原子であり、Xaが水素原子である化合物(2-1)のORbを、tert-ブチル 3,6-ジアザビシクロ[3.1.1]ヘプタン-6-カルボキシレートで置換して式(4):
[式(4)中、Raは置換されていてもよいアリールメチル基であり、R3はハロゲン原子であり、Bocはtert-ブトキシカルボニル基である。]
で表される化合物とし、
前記式(4)で表される化合物に、金属触媒存在下で交差カップリング反応によりチアゾール-2-イル基を導入して式(5):
[式(5)中、Raは置換されていてもよいアリールメチル基であり、Bocはtert-ブトキシカルボニル基である。]
で表される化合物とし、
前記式(5)で表される化合物と有機酸とを反応させることにより、前記式(3)で表される化合物又はその塩を製造する工程である、
請求項1に記載の製造方法。 - 前記工程Bが、
前記式(2)中、Raが置換されていてもよいアリールメチル基であり、Rbが置換されていてもよいアルキル基であり、R3がハロゲン原子であり、Xaが水素原子である化合物(2-1)に、金属触媒存在下で交差カップリング反応によりチアゾール-2-イル基を導入して、前記式(2)中、Raが置換されていてもよいアリールメチル基であり、Rbが置換されていてもよいアルキル基であり、R3がチアゾール-2-イル基であり、Xaが水素原子である化合物(2-11)とし、
化合物(2-11)のORbを、tert-ブチル 3,6-ジアザビシクロ[3.1.1]ヘプタン-6-カルボキシレートで置換して式(5):
[式(5)中、Raは置換されていてもよいアリールメチル基であり、Bocはtert-ブトキシカルボニル基である。]
で表される化合物とし、
前記式(5)で表される化合物と有機酸とを反応させることにより、前記式(3)で表される化合物又はその塩を製造する工程である、
請求項1に記載の製造方法。 - 前記工程Bが、
前記式(2)中、Raが水素原子であり、Rbが置換されていてもよいアルキル基であり、R3が水素原子であり、Xaが水素原子である化合物(2-2)と臭素化剤とを反応させ、前記式(2)中、Raが水素原子であり、Rbが置換されていてもよいアルキル基であり、R3が臭素原子であり、Xaが臭素原子である化合物(2-21)とし、
化合物(2-21)のORbを、tert-ブチル 3,6-ジアザビシクロ[3.1.1]ヘプタン-6-カルボキシレートで置換して、式(8):
[式(8)中、Bocはtert-ブトキシカルボニル基である。]
で表される化合物とし、
前記式(8)で表される化合物に、金属触媒存在下で交差カップリング反応によりチアゾール-2-イル基を導入して、式(9):
[式(9)中、Bocはtert-ブトキシカルボニル基である。]
で表される化合物とし、
前記式(9)で表される化合物と金属類とを反応させることにより、前記式(3)で表される化合物又はその塩を製造する工程である、
請求項1に記載の製造方法。 - 前記工程Aが、
前記式(10)中、R1がハロゲン原子であり、R2がハロゲン原子であり、R3が水素原子である化合物(10-1)とベンジルアルコールとを反応させ、式(10-11):
[式(10-11)中、R2はハロゲン原子であり、Bnはベンジル基である。]
で表される化合物とし、
前記式(10-11)で表される化合物と臭素化剤とを反応させ、式(10-12):
[式(10-12)中、R2はハロゲン原子であり、Bnはベンジル基である。]
で表される化合物とし、
前記式(10-12)で表される化合物とアルカリ水溶液とを反応させ、式(10-13):
[式(10-13)中、Bnはベンジル基である。]
で表される化合物とし、
前記式(10-13)で表される化合物と還元剤とを反応させ、式(14):
[式(14)中、Bnはベンジル基である。]
で表される化合物とし、
前記式(14)で表される化合物とテトラアルコキシメタンとを酸触媒存在下で反応させることにより、前記式(2)で表される化合物又はその塩を製造する工程である、
請求項5に記載の製造方法。 - 前記工程Aが、
前記式(10)中、R1が水酸基であり、R2が水酸基であり、R3が水素原子である化合物(10-2)を還元した後に酸触媒存在下でテトラアルコキシメタンと反応させ、次いで、臭素化剤と反応させることにより、前記式(2)で表される化合物又はその塩を製造する工程である、
請求項5に記載の製造方法。
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| CN202280035356.1A CN117295744A (zh) | 2021-06-30 | 2022-06-30 | 具有二环性哌嗪环的苯并噁唑衍生物或其盐的制造方法以及其原料的制造方法 |
| US18/575,158 US20240309010A1 (en) | 2021-06-30 | 2022-06-30 | Method for producing benzoxazole derivative having bicyclic piperazine ring or salt thereof, and method for producing material thereof |
| EP22833266.4A EP4365174A4 (en) | 2021-06-30 | 2022-06-30 | PROCESS FOR PRODUCING A BENZOXAZOLE DERIVATIVE HAVING A BICYCLIC PIPERAZINE RING OR SALT THEREOF, AND PRODUCTION METHOD THEREFOR |
| KR1020237043708A KR20240027603A (ko) | 2021-06-30 | 2022-06-30 | 바이사이클릭 피페라진 고리 또는 이의 염을 갖는 벤조옥사졸 유도체의 제조방법 및 이의 원료의 제조방법 |
| BR112023025934A BR112023025934A2 (pt) | 2021-06-30 | 2022-06-30 | Método para produzir derivado de benzoxazol tendo anel piperazina bicíclico ou sal do mesmo, e método para produzir material do mesmo |
| MX2023014123A MX2023014123A (es) | 2021-06-30 | 2022-06-30 | Metodo para producir derivado de benzoxazol que tiene anillo biciclico de piperazina o sal de este y metodo para producir materia prima de este. |
| CA3223354A CA3223354A1 (en) | 2021-06-30 | 2022-06-30 | Method for producing benzoxazole derivative having bicyclic piperazine ring or salt thereof, and method for producing material thereof |
| IL309736A IL309736A (en) | 2021-06-30 | 2022-06-30 | A method for producing a derivative of benzoxazole having a bicyclic piperazine ring or a salt thereof and a method for producing a substance from it |
| JP2023532045A JP7476431B2 (ja) | 2021-06-30 | 2022-06-30 | 二環性ピペラジン環を有するベンゾオキサゾール誘導体又はその塩の製造方法、並びに、その原料の製造方法 |
| AU2022300611A AU2022300611A1 (en) | 2021-06-30 | 2022-06-30 | Method for producing benzoxazole derivative having bicyclic piperazine ring or salt thereof, and method for producing material thereof |
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| WO2015005429A1 (ja) * | 2013-07-10 | 2015-01-15 | Meiji Seikaファルマ株式会社 | 新規pde4阻害剤 |
| WO2018124060A1 (ja) | 2016-12-26 | 2018-07-05 | Meiji Seikaファルマ株式会社 | 新規化合物及びその薬理的に許容される塩 |
| WO2020004521A1 (ja) * | 2018-06-27 | 2020-01-02 | Meiji Seikaファルマ株式会社 | 炎症性疾患、自己免疫疾患、線維化疾患、及びがん疾患の治療剤 |
| WO2020004518A1 (ja) * | 2018-06-27 | 2020-01-02 | Meiji Seikaファルマ株式会社 | 新規pde4阻害剤 |
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| WO2015005429A1 (ja) * | 2013-07-10 | 2015-01-15 | Meiji Seikaファルマ株式会社 | 新規pde4阻害剤 |
| WO2018124060A1 (ja) | 2016-12-26 | 2018-07-05 | Meiji Seikaファルマ株式会社 | 新規化合物及びその薬理的に許容される塩 |
| WO2020004521A1 (ja) * | 2018-06-27 | 2020-01-02 | Meiji Seikaファルマ株式会社 | 炎症性疾患、自己免疫疾患、線維化疾患、及びがん疾患の治療剤 |
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