TWI565704B - 用於製備hcv巨環蛋白酶抑制劑之方法及中間物 - Google Patents
用於製備hcv巨環蛋白酶抑制劑之方法及中間物 Download PDFInfo
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- TWI565704B TWI565704B TW101134606A TW101134606A TWI565704B TW I565704 B TWI565704 B TW I565704B TW 101134606 A TW101134606 A TW 101134606A TW 101134606 A TW101134606 A TW 101134606A TW I565704 B TWI565704 B TW I565704B
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- lactone
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- 238000000034 method Methods 0.000 title claims description 41
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- ZMANZCXQSJIPKH-UHFFFAOYSA-N Triethylamine Chemical compound CCN(CC)CC ZMANZCXQSJIPKH-UHFFFAOYSA-N 0.000 claims description 24
- KMPWYEUPVWOPIM-KODHJQJWSA-N cinchonidine Chemical class C1=CC=C2C([C@H]([C@H]3[N@]4CC[C@H]([C@H](C4)C=C)C3)O)=CC=NC2=C1 KMPWYEUPVWOPIM-KODHJQJWSA-N 0.000 claims description 24
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 claims description 21
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- KMPWYEUPVWOPIM-UHFFFAOYSA-N cinchonidine Natural products C1=CC=C2C(C(C3N4CCC(C(C4)C=C)C3)O)=CC=NC2=C1 KMPWYEUPVWOPIM-UHFFFAOYSA-N 0.000 claims description 7
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- 239000000126 substance Substances 0.000 claims description 4
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- 239000005635 Caprylic acid (CAS 124-07-2) Substances 0.000 claims 1
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- KCIDZIIHRGYJAE-YGFYJFDDSA-L dipotassium;[(2r,3r,4s,5r,6r)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl] phosphate Chemical class [K+].[K+].OC[C@H]1O[C@H](OP([O-])([O-])=O)[C@H](O)[C@@H](O)[C@H]1O KCIDZIIHRGYJAE-YGFYJFDDSA-L 0.000 description 5
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- XCIXKGXIYUWCLL-UHFFFAOYSA-N cyclopentanol Chemical class OC1CCCC1 XCIXKGXIYUWCLL-UHFFFAOYSA-N 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- XFLSEYYPOYRKKC-RNFRBKRXSA-N dimethyl (1r,2r)-cyclopentane-1,2-dicarboxylate Chemical compound COC(=O)[C@@H]1CCC[C@H]1C(=O)OC XFLSEYYPOYRKKC-RNFRBKRXSA-N 0.000 description 1
- UMLMPTNZLQAUIS-UHFFFAOYSA-N dimethyl 3-oxocyclopentane-1,1-dicarboxylate Chemical compound COC(=O)C1(C(=O)OC)CCC(=O)C1 UMLMPTNZLQAUIS-UHFFFAOYSA-N 0.000 description 1
- GMKJWKXCHOWVDN-UHFFFAOYSA-N dimethyl 4-oxocyclopentane-1,2-dicarboxylate Chemical compound COC(=O)C1CC(=O)CC1C(=O)OC GMKJWKXCHOWVDN-UHFFFAOYSA-N 0.000 description 1
- LDCRTTXIJACKKU-ONEGZZNKSA-N dimethyl fumarate Chemical compound COC(=O)\C=C\C(=O)OC LDCRTTXIJACKKU-ONEGZZNKSA-N 0.000 description 1
- 230000032050 esterification Effects 0.000 description 1
- 238000005886 esterification reaction Methods 0.000 description 1
- RIFGWPKJUGCATF-UHFFFAOYSA-N ethyl chloroformate Chemical compound CCOC(Cl)=O RIFGWPKJUGCATF-UHFFFAOYSA-N 0.000 description 1
- 239000012065 filter cake Substances 0.000 description 1
- 150000008282 halocarbons Chemical class 0.000 description 1
- 208000006454 hepatitis Diseases 0.000 description 1
- DMEGYFMYUHOHGS-UHFFFAOYSA-N heptamethylene Natural products C1CCCCCC1 DMEGYFMYUHOHGS-UHFFFAOYSA-N 0.000 description 1
- NPZTUJOABDZTLV-UHFFFAOYSA-N hydroxybenzotriazole Substances O=C1C=CC=C2NNN=C12 NPZTUJOABDZTLV-UHFFFAOYSA-N 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 239000013067 intermediate product Substances 0.000 description 1
- 125000000959 isobutyl group Chemical group [H]C([H])([H])C([H])(C([H])([H])[H])C([H])([H])* 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 125000001449 isopropyl group Chemical group [H]C([H])([H])C([H])(*)C([H])([H])[H] 0.000 description 1
- 150000004715 keto acids Chemical class 0.000 description 1
- 238000005649 metathesis reaction Methods 0.000 description 1
- 229940098779 methanesulfonic acid Drugs 0.000 description 1
- XMJHPCRAQCTCFT-UHFFFAOYSA-N methyl chloroformate Chemical compound COC(Cl)=O XMJHPCRAQCTCFT-UHFFFAOYSA-N 0.000 description 1
- 150000002763 monocarboxylic acids Chemical class 0.000 description 1
- 229930003658 monoterpene Natural products 0.000 description 1
- 150000002773 monoterpene derivatives Chemical class 0.000 description 1
- 235000002577 monoterpenes Nutrition 0.000 description 1
- 125000004108 n-butyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- OHDXDNUPVVYWOV-UHFFFAOYSA-N n-methyl-1-(2-naphthalen-1-ylsulfanylphenyl)methanamine Chemical compound CNCC1=CC=CC=C1SC1=CC=CC2=CC=CC=C12 OHDXDNUPVVYWOV-UHFFFAOYSA-N 0.000 description 1
- KKIMETYRXLWWSD-UHFFFAOYSA-N n-methylhex-5-en-1-amine Chemical compound CNCCCCC=C KKIMETYRXLWWSD-UHFFFAOYSA-N 0.000 description 1
- 125000004123 n-propyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 150000007524 organic acids Chemical class 0.000 description 1
- 150000007530 organic bases Chemical class 0.000 description 1
- 239000003791 organic solvent mixture Substances 0.000 description 1
- 238000007243 oxidative cyclization reaction Methods 0.000 description 1
- 238000005895 oxidative decarboxylation reaction Methods 0.000 description 1
- 238000007248 oxidative elimination reaction Methods 0.000 description 1
- 230000037361 pathway Effects 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- UGLYZKRVGNAOLZ-UHFFFAOYSA-N propan-2-yl 2-propan-2-yloxy-2h-quinoline-1-carboxylate Chemical compound C1=CC=C2N(C(=O)OC(C)C)C(OC(C)C)C=CC2=C1 UGLYZKRVGNAOLZ-UHFFFAOYSA-N 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 150000003248 quinolines Chemical class 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 230000010076 replication Effects 0.000 description 1
- MHOVAHRLVXNVSD-UHFFFAOYSA-N rhodium atom Chemical compound [Rh] MHOVAHRLVXNVSD-UHFFFAOYSA-N 0.000 description 1
- 229960000329 ribavirin Drugs 0.000 description 1
- HZCAHMRRMINHDJ-DBRKOABJSA-N ribavirin Natural products O[C@@H]1[C@H](O)[C@@H](CO)O[C@H]1N1N=CN=C1 HZCAHMRRMINHDJ-DBRKOABJSA-N 0.000 description 1
- 229910052707 ruthenium Inorganic materials 0.000 description 1
- 229930195734 saturated hydrocarbon Natural products 0.000 description 1
- 230000007017 scission Effects 0.000 description 1
- 125000002914 sec-butyl group Chemical group [H]C([H])([H])C([H])([H])C([H])(*)C([H])([H])[H] 0.000 description 1
- 238000010956 selective crystallization Methods 0.000 description 1
- KZNICNPSHKQLFF-UHFFFAOYSA-N succinimide Chemical class O=C1CCC(=O)N1 KZNICNPSHKQLFF-UHFFFAOYSA-N 0.000 description 1
- 238000001308 synthesis method Methods 0.000 description 1
- 230000002194 synthesizing effect Effects 0.000 description 1
- 238000010189 synthetic method Methods 0.000 description 1
- 125000000999 tert-butyl group Chemical group [H]C([H])([H])C(*)(C([H])([H])[H])C([H])([H])[H] 0.000 description 1
- 230000001225 therapeutic effect Effects 0.000 description 1
- 238000006276 transfer reaction Methods 0.000 description 1
- 238000002054 transplantation Methods 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D453/00—Heterocyclic compounds containing quinuclidine or iso-quinuclidine ring systems, e.g. quinine alkaloids
- C07D453/02—Heterocyclic compounds containing quinuclidine or iso-quinuclidine ring systems, e.g. quinine alkaloids containing not further condensed quinuclidine ring systems
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- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D307/00—Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom
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- A61P31/12—Antivirals
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- C07C231/00—Preparation of carboxylic acid amides
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- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C231/00—Preparation of carboxylic acid amides
- C07C231/16—Preparation of optical isomers
- C07C231/18—Preparation of optical isomers by stereospecific synthesis
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- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C235/00—Carboxylic acid amides, the carbon skeleton of the acid part being further substituted by oxygen atoms
- C07C235/40—Carboxylic acid amides, the carbon skeleton of the acid part being further substituted by oxygen atoms having carbon atoms of carboxamide groups bound to carbon atoms of rings other than six-membered aromatic rings and singly-bound oxygen atoms bound to the same carbon skeleton
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- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C235/00—Carboxylic acid amides, the carbon skeleton of the acid part being further substituted by oxygen atoms
- C07C235/70—Carboxylic acid amides, the carbon skeleton of the acid part being further substituted by oxygen atoms having carbon atoms of carboxamide groups and doubly-bound oxygen atoms bound to the same carbon skeleton
- C07C235/82—Carboxylic acid amides, the carbon skeleton of the acid part being further substituted by oxygen atoms having carbon atoms of carboxamide groups and doubly-bound oxygen atoms bound to the same carbon skeleton with the carbon atom of at least one of the carboxamide groups bound to a carbon atom of a ring other than a six-membered aromatic ring
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- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C235/00—Carboxylic acid amides, the carbon skeleton of the acid part being further substituted by oxygen atoms
- C07C235/70—Carboxylic acid amides, the carbon skeleton of the acid part being further substituted by oxygen atoms having carbon atoms of carboxamide groups and doubly-bound oxygen atoms bound to the same carbon skeleton
- C07C235/84—Carboxylic acid amides, the carbon skeleton of the acid part being further substituted by oxygen atoms having carbon atoms of carboxamide groups and doubly-bound oxygen atoms bound to the same carbon skeleton with the carbon atom of at least one of the carboxamide groups bound to a carbon atom of a six-membered aromatic ring
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- C07D311/02—Heterocyclic compounds containing six-membered rings having one oxygen atom as the only hetero atom, condensed with other rings ortho- or peri-condensed with carbocyclic rings or ring systems
- C07D311/04—Benzo[b]pyrans, not hydrogenated in the carbocyclic ring
- C07D311/06—Benzo[b]pyrans, not hydrogenated in the carbocyclic ring with oxygen or sulfur atoms directly attached in position 2
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- 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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Description
本發明係關於C型肝炎病毒(HCV)之巨環蛋白酶抑制劑的合成方法及合成中間物。
C型肝炎病毒(HCV)為慢性肝炎的主要原因,其可進展為肝纖維變性導致肝硬化、末期肝病,及HCC(肝細胞癌),使其成為肝移植的主要原因。目前抗HCV療法係以(聚乙二醇化)干擾素-α(IFN-α)與三氮唑核苷(ribavirin)合併為主,其效益有限,副作用顯著,且於許多病患中耐受性很差。此促使尋求更有效,方便且耐受較佳之療法。
HCV染色體之複製係藉由多種酵素媒介,其中為HCV NS3絲胺酸蛋白酶及其之相關輔因子,NS4A。抑制該酵素之各種試劑業已說明。WO 05/073195揭示具有中央取代之脯胺酸部分的線形及巨環NS3絲胺酸蛋白酶抑制劑及WO 05/073216具有中央環戊烷部分者。於其等之中,該巨環衍生物係以其等顯著對抗HCV之活性及引人注目之藥物動力態樣而具吸引力。
WO 2007/014926說明包括式I化合物之巨環環戊烷及脯胺酸衍生物,下文以結構代表。該式I化合物
為非常有效之HCV絲胺酸蛋白酶抑制劑且於藥物動態上特別引人注目。由於其之有利特性,其已被選作為發展抗HCV藥物之潛在候選。因此,需要提供以高產率且具有高純度之產物為主用來製造較大數量該活性組成份的方法。WO 2008/092955說明製備該式I化合物之方法及中間物。
根據WO 2007/014926,該式I化合物可由,於實例4中稱為化合物39,或於本參考之一般說明中稱為化合物17b,或於本說明書及申請專利範圍中稱為化合物II之二環內酯羧酸起始製備。於該二環內酯羧酸中,羧酸係與N-甲基己-5-烯基胺38偶合,接著內酯打開成4-羥基環戊烷衍生物41。然後後者衍生物41與胺基環丙基羧酸酯偶合成環戊烷二羧酸二醯胺43,將其於涉及於帶羥基之碳逆轉之光信(Mitsunobu)醚生成反應中與喹啉36偶合。將該產生之中間物44經由複分解反應環化成巨環衍生物,其中該酯基水解且與
環丙基磺醯醯胺偶合而產生想要之式I最終產物。此等反應係於下列之圖示中闡明,其中R代表C1-4烷基且於實例4中,R為乙基。
該對映異構體純的二環內酯39係由3,4-雙(甲氧基羰基)環-戊酮之對映異構體,於WO 2007/014926中稱為(17a)者起始製備。後者係如由洛森奎斯特(Rosenquist)等人於Acta Chemica Scandinavica 46(1992)1127-1129中所說明者製備。消旋環己烯二羧酸甲酯係經由3-環丁烯碸(sulfolene)及二甲基反式丁烯二酸鹽之狄耳士-阿德爾反應(Diels-Alder reaction),接著進行雙鍵之氧化裂解、環化、及脫羧,獲得(±)4-酮基環戊烷二羧酸二甲酯而合成。後者之離析作用係藉著使用豬肝酯酶水解而獲得相關之(+)-一元酸及(-)二酯,其為WO 2007/014926之中間物(17a)。
於移除(+)-一元酸後,首先將酮還原為醇,接著水解酯,且形成內酯而將該反式(3R,4R)-3,4-雙(甲氧基羰基)環戊酮二酯(17a)轉化為二環內酯17b(亦稱為化合物II,參見於前)。
說明於WO 2008/092955中用於製備I之合成方法係由中間物D起始,其中將該酯官能水解且與環丙基
胺基酸酯C偶合。該產生之中間物B係藉由烯烴複分解反應而環化成巨環酯A,將其水解且與環丙基磺醯醯胺偶合成最終產物I。此等反應概述於如下反應圖示中。於此及下列之反應圖示中,R為C1-4烷基,特別R為乙基。R1為C1-4烷基,特別R1為甲基或乙基。
中間物D又可由式H1之羥基環戊基雙酯起始而製備,其係藉由(a)將H1與噻唑基取代之喹啉醇E進行反應成式K之喹啉基氧基環戊基雙酯,接著該苄酯基裂解成
一元羧酸J,其又與N-甲基己烯胺偶合成中間物D;或(b)該苄酯於H1中裂解成一元羧酸G,後者與N-甲基己烯胺偶合成羥基環戊基醯胺F,其又與E進行反應,因而得到D;如概述於下列之反應圖示中者:
各個R1於該圖示中係如上所指定者且Bn代表苄基。
此外,WO 2008/092955說明由4-酮基-1,2,-環戊烷二羧酸O起始製備中間物H1的方法,其係藉酮還原成醇,因而得到4-羥基-1,2-環戊烷二羧酸N,其又環化成二環內酯M。該羧酸基團於後之酯化作用產生內酯苄基酯L,其中,該內酯係於C1-4烷醇存在下藉酯基轉移反應而打開,因此產生中間物H,其係於其之對映異構體H1及H2中離析,如概述於下列之反應圖示中者:
上述方法之缺點係H之對映異構體離析作用涉及對掌管柱色層分離法,其煩瑣的過程不易於大規模生產上運作。另一不利為該離析作用係於合成法之後階段中進行,於此,半數之構築嵌段H必須丟棄。於該式I化合物中存有各種對掌中心且其之前輩提出特別
的挑戰在於對映異構體純度是可接受的產物用於治療用途上所必不可少的。因此,用於製備D之方法應導致可接受之對映異構體純度的產物,而無需使用大量減低不想要之立體異構型式之煩瑣的純化過程。
本田等,四面體手札,22卷,28號,2679-2682頁,1981,說明使用下列啟動物質之(±)-菌素A(brefeldin A)合成法:
本田等之合成法係由dl-反式-4-酮基環戊烷-1,2-二羧酸2起始,將其酯化成相關之甲酯3,且用阮來鎳還原成醇4。將4部份水解成一元羧酸且與苄基溴化物進行苄化作用而顯著地得到非對映立體異構物5,亦即該非對映立體異構物,其中羥基及苄基酯基團係在順式位置。於本田等中後者之酯5及化合物H二者皆為消旋物,但互為非對映立體異構物,更精確為於第四個碳上帶有羥基之差向異構物(epimers)。化合物H1為由消旋化合物H藉由分離所得到之二個對映異構體之一。另一個對映異構體為化合物H2。
於式I化合物之合成法中,該二環內酯(17b)為令人感興趣之構築嵌段。找出獲得良好產率及高對映異
構體純度內酯之合成途徑是所期望實現的目標。本發明係提供如此的方法。
WO 2010/072742說明上述二環內酯之辛可尼丁鹽作為中間物用於中間物(IX)之製備中,且因此亦用於HCV抑制劑(I)之製備中。
於WO 2010/072742中,該辛可尼丁鹽(IV)係經由非對映立體異構鹽混合物(III)之離析作用藉選擇性結晶而製備。該鹽(III)同樣藉由形成該消旋二環內酯羧酸(II)之辛可尼丁鹽而得到,如概述於下列之反應圖示中者:
所期望的是提供用於製備該辛可尼丁鹽(IV)更方便之方法。
本發明於一方面中係提供用於製備式(IV)辛可尼丁鹽之方法,其包括下列之步驟:(a)將4-酮基-1,2-環戊烷二羧酸(V)於水環境中進行還原作用,因而提供消旋4-羥基-1,2-環戊烷二羧酸(VI)之水溶液;(b)將可與水溶混之有機溶劑加至於(a)中所得到之水溶液;(c)將該消旋羥酸(VI)進行環化作用以便得到相關消旋內酯酸(II)之有機溶劑水溶液;(d)將辛可尼丁添加至於(c)中所得到之有機溶劑水溶液,以便得到該內酯酸之辛可尼丁鹽(III);
(e)讓該辛可尼丁鹽結晶以便得到對映異構體純化之晶狀內酯酸辛可尼丁鹽(IV),本文中編號之化學式如下:
例如,於本發明之觀點中係執行步驟(a)、(b)及(c)(不一定要接著步驟(d)及(e)),雖然最好連續進行步驟(a)至(e)全部。於另一方面中係進行步驟(d)及(e),其等不一定要在步驟(a)、(b)及(c)全部之前進行。
使用於本文中所說明之方法中的化合物(例如式
(V)、(VI)及(II)之化合物,以及其他化合物,例如於式I之HCV抑制劑化合物或其鹽之合成法中涉及下游化學者)可為非鹽型式或其等可為鹽型式。例如,當使用於本文中所說明之方法時,該式(VI)化合物可以鹽的型式存在,例如其可如雙鹽存在,其中該鹽為,例如無機金屬例如Na或K(或類似者)或該鹽為胺(例如有機胺,如三乙胺或N-甲基嗎福啉,或類似者)。當然,當式(VI)之鹽於水溶液中時,其可能有鹽解度。
於另一個觀點中,本發明係提供用於製備於式I之HCV抑制劑化合物製備中之中間物(IX)的方法,該方法包括製備對映異構體純化之晶狀內酯酸辛可尼丁鹽(IV)的步驟於包括如上所確認之步驟(a)至(e)之方法中,且該內酯酸辛可尼丁鹽(IV)與N-甲基-己烯胺(NMHA)(VII)於醯胺形成反應中進行反應而產生二環內酯醯胺(VIII),其中該內酯基團打開而產生想要的產物(IX),如闡明於如下圖示中者,其中,R1為C1-4烷基:
於尚有另一個觀點中,本發明係提供用於製備化合物(I)之方法,其包括製備如上所述之辛可尼丁鹽,接著製備如上所述之化合物IX,且於(I)之合成法中使用化合物(IX)作為中間物。
結構之概述係說明於本說明書及申請專利範圍中。
本發明之方法係以提供4-酮基-1,2-環戊烷二羧酸(V)而起始。該消旋4-酮基-1,2-環戊烷二羧酸V啟動物質可如本發明章節之背景中所說明者製備。
該酮酸(V)係於水環境中進行還原作用,因而提供消旋4-羥基-1,2-環戊烷二羧酸(VI)之水溶液。該酮基還原成羥基而使V轉化成VI可使用適當還原劑來完成,特別藉由氫於金屬催化劑,例如銠於碳上或於礬土上或阮來鎳存在下,於反應惰性溶劑中,例如於水介質,如水中,於鹼,例如NaOH、KOH,或有機鹼例如三乙胺,N-甲基嗎福啉或亨氏鹼(Hunig’s base)(二異丙基乙基胺)存在下完成。
本發明方法帶來之優點是該方法步驟之順序可無需移除水份、形成鹽、沉澱,或於其他分離技術間進行。如此,於由上述酮基還原成羥基所得到之水溶液中,加入有機共溶劑(例如可與水溶混之有機共溶劑)。精於此方面技藝之人士應理解該有機共溶劑應向所進行之反應為惰性,且應可(例如當其為可與水溶混之有機共溶劑)充分地與水溶混以便形成單相溶劑系統。然而,該溶劑系統不需要一定是單相溶劑系統(例
如同質混合物),但其可為雙相(例如多相性)溶劑系統。適當之可與水溶混之有機共溶劑包括酮如丙酮或甲基乙基酮(MEK)、醚如四氫呋喃(THF)或2-甲基四氫呋喃(MeTHF),或乙腈。於該步驟中較佳之溶劑為丙酮。其他溶劑可提及者並非一定為可與水溶混者,例如彼等可為非水溶混或至少僅適度地可與水溶混者,例如芳族溶劑例如甲苯或苯。
因此,所形成之消旋羥酸(VI)係以溶液存在於水性有機溶劑混合物中者進行環化作用,以便得到相關消旋內酯酸(II)之有機溶劑水溶液。該環化作用可用已知之內酯形成劑,例如氯甲酸酯,例如與乙基或甲基氯甲酸酯來進行。可加入鹼,例如第三胺,例如三乙胺或N-甲基嗎福啉(NMM)。於較佳之具體例中,該內酯形成劑為三,更佳為2,4,6-三氯-1,3,5-三(TCT)或其衍生物。
如本發明方法之優點,宜使用三衍生物,將該環化作用於單堝法中無需分離中間產物而進行。用於該反應之三衍生物包括試劑如2,4,6-三氯-1,3,5-三(TCT)、氯-二甲氧基三(CDMT)、N-(3,5-二甲氧基三基)-N-甲基嗎福啉鎓氯化物(DMTMM)或二氯-甲氧基三(DCMT)。該反應順序係提供簡單、簡短及經濟之方法用來製備高產量之消旋內酯酸II。於該還原步驟中,無需將用作為溶劑之水份移除且無需將中間物4-羥基-1,2-環戊烷-二羧酸VI分離。
為了達到對映異構體之純度而添加辛可尼丁。有利地,於本發明之方法中,此無需將該中間物內酯酸(II)分離而進行。因此,將辛可尼丁加至內酯酸(II)之有機溶劑水溶液中以便得到其辛可尼丁鹽(III)。根據WO 2010/072742,該對映異構體純的辛可尼丁鹽(IV)可藉結晶作用而單離,其提供優雅的方式來解析該二環內酯酸(II)之立體化學以得到所期望之高對映異構體純度的內酯酸。再結晶或再拌漿可進一步純化該鹽。
本發明進一步提供用於製備於式I之HCV抑制劑化合物製備中之中間物(IX)的方法。該方法首先包括製備對映異構體純化之晶狀內酯酸辛可尼丁鹽(IV)之步驟如上所述者。因此,將該內酯酸辛可尼丁鹽(IV)進一步反應如說明於WO 2010/072742中者。
此最好需要該內酯酸辛可尼丁鹽(IV)與N-甲基-己烯胺(NMHA)(VII)於醯胺形成反應中進行反應而產生二環內酯醯胺(VIII)。於其中該內酯基團打開而產生想要的產物(IX),如闡明於如下圖示中者,其中,R1為C1-4烷基,且較佳為甲基:
該辛可尼丁鹽(IV)與NMHA(VII)之反應為醯胺形成反應,其包括將啟動物質與醯胺偶合劑於反應惰性溶劑中,任意於鹼存在下進行反應。可使用之溶劑包括鹵化烴類如二氯甲烷(DCM)或氯仿,醚類如四氫呋喃(THF)或2-甲基四氫呋喃(MeTHF),醇類如甲醇或乙醇,烴溶劑類如甲苯或二甲苯,二極性非質子性溶劑如DMF、DMA、乙腈,或其混合物。較佳者為二氯甲烷、MeTHF、甲醇、乙醇、甲苯,或其混合物。醯胺偶合劑包括試劑如N-乙氧基羰基-2-乙氧基-1,2-二氫喹啉(EEDQ)、N-異丙氧基羰基-2-異丙氧基-1,2-二氫喹啉,特別其之氫氯化物鹽,(IIDQ)、N,N,N',N'-四甲基-O-(7-氮雜苯并三唑-1-基)鎓六氟磷酸鹽(HATU)、苯并三唑-1-基 1-氧基-三-吡咯啶并-鏻六氟磷酸鹽(市售可得者如PyBOP®)、1,1'-羰基二咪唑(CDI)、1-乙基-3-(3-二甲基胺基丙基)碳化二亞胺(EDI或EDCI)以及其之氫氯化物鹽,二環己基-碳化二亞胺(DCC),或1,3-二異丙基碳化二亞胺,O-苯并三唑-N,N,N’,N’-四甲基-鎓-六氟-磷酸鹽(HBTU)等。可添加催化劑,例如1-羥基苯并三唑(HOBt)或4-二甲基胺基吡啶(DMAP)。該反應通常於鹼,特別胺鹼如第三胺,例如三乙胺、N-甲基嗎福啉、N,N-二異丙基乙基胺,(後者亦稱為亨氏鹼(Hünig’s base),DIPEA,或DIEA)存在下進行。較佳者,不使用鹼。於一個具體例中,該反應係於DCM或MeTHF中與EEDQ,任意於反應終止時添加甲醇,於
該反應混合物之回流溫度進行。
於替代具體例中,該鹽(IV)可分裂成辛可尼丁及二環內酯,且後者可與NMHA於醯胺形成反應中進行反應如上所述者。根據WO 2010/072742,將辛可尼丁鹽(IV)本身使用於醯胺形成反應中,且之後將該辛可尼丁移除為有利。該移除可容易地於該反應混合物之操作中,例如藉著將後者與酸如HCl處理,且用水相將該副產物洗去而作用。
於該產生之二環內酯醯胺(VIII)中,該內酯官能度係用醇,其亦可用作為溶劑,特別C1-4烷醇如甲醇或乙醇,於酸存在下,藉由酯基轉移反應而打開。可使用之酸為強有機酸如磺酸,特別甲烷磺酸。可添加之溶劑例如醚,特別THF或MeTHF;或烴溶劑如甲苯或二甲苯。該酯基轉移反應產生該醇之酯,其例如當該反應於甲醇中進行時係形成甲酯時使用。
具有R1宜為甲基之該產生的化合物(VIII),發現使用於該式(I)化合物之製備方法中。
該式VIII化合物製成式I最終產物之進一步的方法係如前文反應圖示中所概述者且特別如於WO2008/092955中所說明者。
本發明之合成方法係提供無需使用對掌色層分離法而於該環戊烷部分得到正確立體化學,且於該方法中避免單離中間物之優點。
下列之定義係應用如使用於前文及下文中者,除非另有說明。“C1-4烷基”一詞係定義具有由1至4個碳原子之直鏈或支鏈飽和烴基例如甲基及乙基;以及1-丙基、2-丙基、1-丁基、2-丁基、2-甲基-1-丙基、2-甲基-2-丙基。
用於代表立體化學化合物之一般所接受之慣例,於本文中亦遵守如下:
- 所代表之化合物不含立體鍵者為消旋或該立體結構中心(類)之構型並未定義。
- 所代表之化合物具有立體鍵及一種描述符號“(±)”、“rel”或“rac”者為消旋且該立體化學係相對的。
- 所代表之化合物具有立體鍵但不含描述符號“(±)”、“rel”或“rac”者係指非消旋化合物(非消旋物質(scalemic substance)),亦即,富含對映異構體。
例如,於本田等(Honda et al.)中使用於文章標題中之參考命名“(±)”係指所說明之消旋合成法具有消旋中間物。然而,未必所有的公開案皆遵循上述慣例。
該對映異構體純度係以對映異構體比率(e.r.)來提供。於該鹽時,該e.r.值係指該酸於非對映異構體鹽混合物中之二個對映異構體的比率。
下列之實例意欲闡明本發明且不應解釋為限制本發明之範圍。
於32.7克(0.19莫耳)含消旋4-酮基-1,2-環戊烷二羧酸(中間物V)於237.5毫升水中之懸浮液,於氮氣壓下添加1.0毫升(0.019莫耳)50%重量/重量含水NaOH。將該混合物溫熱至60℃且添加2.5克Rh/C(5%重量/重量)。然後將反應瓶用氫清除且於攪拌同時保持
於氫氫壓下直到達到完全轉化。將溫熱之反應混合物於寅氏鹽上過濾且將該濾餅用10毫升水清洗二次。將三乙胺(55.61毫升,0.40莫耳)加入且將80%之溶劑體積於30毫巴(mbar)壓力下蒸餾出來。將該反應瓶裝置充滿2-甲基四氫呋喃之迪安-斯塔克分離器(Dean-Stark trap)。將2-甲基四氫呋喃(100毫升)加至該反應混合物。將該混合物回流4小時以移除剩餘的水。然後將80%之溶劑體積於周遭壓力下蒸餾出來。將該混合物冷卻至50℃且添加丙酮(380毫升)。將該混合物進一步冷卻至22℃且添加額外的丙酮(760毫升)。將該產生之懸浮液於氮氣壓下冷卻至-5℃且添加三乙胺(27.8毫升,20.24克,0.2莫耳)。接著逐滴加入氯甲酸乙酯(22.68克,0.21莫耳)且將該混合物於0℃攪拌3小時,然後於22℃下另外12小時。將該反應混合物於代卡利特(Dicalite)上過濾且將該固體用丙酮(100毫升)清洗。該結果為含有II於丙酮中之溶液。
然而,較佳者,將VI之水溶液(任意以鹽型式)於水份移除之前(經由迪安-斯塔克分離器)予以收集(於中間物V還原後)且隨後進行環化作用/內酯形成作用如說明於下之實例中者。
將735毫克VI,二鉀鹽(1毫莫耳)之23.7重量/重量%水溶液稀釋於4毫升水中,且用728微升NMM
(6.6毫莫耳)予以混合。將406毫克(2.2毫莫耳)TCT加入,且將該反應混合物於稀釋至最終體積10毫升之前,於室溫攪拌過夜而得到78 mM,II之水溶液(產率:78%)。
將728微升NMM(6.6毫莫耳)用4毫升水混合,且加入406毫克(2.2毫莫耳)TCT。將該混合物於添加735毫克VI,二鉀鹽(1毫莫耳)之23.7重量/重量%水溶液之前攪拌數分鐘。將該產生之反應混合物於稀釋至最終體積10毫升之前,於室溫攪拌過夜而得到57 mM,II之水溶液(產率:57%)。
將735毫克VI,二鉀鹽(1毫莫耳)之23.7重量/重量%水溶液稀釋於4毫升水中,且用221微升NMM(2毫莫耳)混合。將648毫克(2.2毫莫耳)DMTMM.H2O加入,且將該反應混合物於稀釋至最終體積10毫升之前,於室溫攪拌過夜而得到54 mM,II之水溶液(產率:54%)。
將386毫克(2.2毫莫耳)CDMT溶解於4毫升丙酮中且添加463微升(4.2毫莫耳)NMM。將該混合物攪
拌數分鐘然後添加735毫克VI,二鉀鹽之23.7重量/重量%水溶液。將該產生之混合物於稀釋至最終體積10毫升之前,進一步於室溫攪拌過夜而得到69 mM,II之溶液(產率:69%)。
將386毫克(2.2毫莫耳)CDMT溶解於4毫升MeTHF中且添加463微升(4.2毫莫耳)NMM。將該混合物攪拌數分鐘,然後添加735毫克VI,二鉀鹽之23.7重量/重量%水溶液。將該產生之混合物於稀釋至最終體積10毫升之前,進一步於室溫攪拌過夜而得到54 mM,II之溶液(產率:54%)。
將5.66克(32.2毫莫耳)CDMT溶解於59毫升MeTHF中。將3.7毫升(33.7毫莫耳)NMM加入且將該混合物於25℃攪拌1小時。將10.0克VI.2NMM(14.6毫莫耳)之25.5重量/重量%水溶液加入且將該產生之混合物於25℃進一步攪拌數小時。將15毫升水及3毫升濃HCl加入。將該混合物攪拌數分鐘,將不溶之物質過濾出來,將濾出物傾析且將該水層用15毫升MeTHF萃取。將該有機層予以合併且用7毫升鹽水清洗而得到53.1克含II於MeTHF中之2.59重量/重量%溶液,其亦含有0.23重量/重量% VI(產
率:60%)。
將5.66克(32.2毫莫耳)CDMT溶解於59毫升異丙基醋酸酯中。將3.7毫升(33.7毫莫耳)NMM加入且將該混合物於25℃攪拌1小時。將10.0克VI之雙N-甲基嗎福啉鹽之25.5重量/重量%水溶液(14.6毫莫耳)加入且將該產生之混合物於25℃進一步攪拌數小時。將15毫升水及3毫升濃HCl加入。將該混合物攪拌數分鐘,將不溶之物質過濾出來,將濾出物傾析且將該水層用15毫升異丙基醋酸酯萃取。將該有機層合併且用7毫升鹽水清洗而得到56.6克含II於異丙基醋酸酯中之1.3重量/重量%溶液,其亦含有0.18重量/重量% VI(產率:32%)。
將5.66克(32.2毫莫耳)CDMT溶解於59毫升丙酮中。將3.7毫升(33.7毫莫耳)NMM加入且將該混合物於25℃攪拌1小時。將10.0克VI之雙N-甲基嗎福啉鹽之25.5重量/重量%水溶液(14.6毫莫耳)加入且將該產生之混合物於25℃進一步攪拌數小時。將不溶之物質過濾出來,將1毫升濃HCl加至該濾出物且將該濾出物傾析。該有機層用7毫升鹽水清洗而得到44.4克,含II於MeTHF中之1.44重量/重量%溶液,其亦
含有0.04重量/重量% VI(產率:28%)。
將19.80克(113毫莫耳)CDMT溶解於205毫升MeTHF中。將13毫升(118毫莫耳)NMM加入且將該混合物於25℃攪拌達2小時。將35克VI之雙N-甲基嗎福啉鹽之25.5重量/重量%水溶液(51.3毫莫耳)加入且將該反應混合物於25℃攪拌過夜。將51毫升水及10.6毫升濃HCl加入且將該混合物於25℃攪拌數分鐘。該產生之固體過濾出來且將該濾出物傾析。將該有機層用51毫升水及26毫升鹽水清洗而得到181.7克含II於MeTHF中之2.13重量/重量%溶液(產率:48%)。
將19.80克(113毫莫耳)CDMT溶解於205毫升MeTHF中。將13毫升(118毫莫耳)NMM加入且將該混合物於25℃攪拌達2小時。將35克VI之雙N-甲基嗎福啉鹽之25.5重量/重量%水溶液(51.3毫莫耳)與14.3毫升(102.5毫莫耳)三乙胺混合,然後加至CDMT與VI之雙N-甲基嗎福啉鹽之混合物中,且將該反應混合物於25℃攪拌過夜。將51毫升水及19.9毫升濃HCl加入,且將該混合物於25℃攪拌數分鐘。將該產生之固體過濾出來且將該濾出物傾析。將該有機層用
51毫升水及26毫升鹽水清洗而得到163.6克含II於MeTHF中之2.56重量/重量%溶液(產率:52%)。
於192.8克內酯酸(II)之水溶液,於攪拌下添加66.8克辛可尼丁,且將該混合物於溫度20℃至25℃攪拌達10分鐘。將該混合物於5分鐘內溫熱多至30℃,且然後於該溫度攪拌30-40分鐘時間。將該反應混合物於5分鐘內冷卻至20℃,且攪拌達10分鐘。將該反應混合物接種,且於20℃至25℃緩緩攪拌下結晶達20小時,其後懸浮液產生。將該沉澱物過濾出來且用11.4毫升水及11.4毫升丙酮之混合物清洗。該結果為對映異構體純度e.r.91/9之辛可尼丁鹽(III)。然後將33.6克所產生之濕性粗產物於惰性氣壓下藉著添加140.2毫升含有2% MEK(甲基乙基酮)之乙醇而再拌漿。之後開始攪拌且添加5.5毫升水。將該反應混合物加熱至77℃回流,且於回流攪拌3小時。將該反應混合物於2小時內冷卻至23℃,且於22℃攪拌達12.5小時。該所產生之沉澱物產物過濾出來且用11.4毫升乙醇2% MEK清洗。將該固體於50℃真空下乾燥4小時期間,而產生22.8克對映異構體純度e.r.97/3之辛可尼丁鹽(III)。
Claims (11)
- 一種用於製備式(IV)辛可尼丁(cinchonidine)鹽之方法,其包括下列之步驟:(a)將4-酮基-1,2-環戊烷二羧酸(V)於水環境中進行還原作用,因而提供消旋4-羥基-1,2-環戊烷二羧酸(VI)之水溶液;(b)將有機溶劑加至於(a)中所得到之水溶液;(c)將該消旋羥酸(VI)進行環化作用以便得到對應消旋內酯酸(II)之有機溶劑水溶液;(d)將辛可尼丁加至於(c)中所得到之有機溶劑水溶液,以便得到該內酯酸之辛可尼丁鹽(III);(e)讓該辛可尼丁鹽結晶以便得到對映異構體純化之晶狀內酯酸辛可尼丁鹽(IV),本項中編號之化學式如下:
- 一種用於製備如申請專利範圍第1項定義的式(II)消旋內酯之方法,其包括步驟(a)、(b)及(c)。
- 如申請專利範圍第1或2項之方法,其中該有機溶劑為可與水溶混之有機溶劑。
- 如申請專利範圍第1或2項之方法,其中該有機溶劑係選自於下列組成之群組:丙酮、甲基乙基酮(MEK)、四氫呋喃(THF)、MeTHF、CPME(環戊基甲基醚)、C1-4烷基醋酸酯、C1-4烷基丙酸酯、C1-4烷基丁酸酯或甲苯。
- 如申請專利範圍第1或2之方法,其中該環化作用係使用三衍生物而進行。
- 如申請專利範圍第5項之方法,其中該三衍生物係選自於下列組成之群組:2,4,6-三氯-1,3,5-三(TCT)、氯-二甲氧基三(CDMT)、N-(3,5-二甲氧基三基)-N-甲基嗎福啉鎓氯化物(DMTMM),及二氯-甲氧基三(DCMT)。
- 如申請專利範圍第1或2項之方法,其中該環化作用係 於第三胺存在下進行。
- 如申請專利範圍第7項之方法,其中該環化作用係於三乙胺或N-甲基嗎福啉(NMM)存在下進行。
- 一種製備用於製備式(I)之HCV抑制劑化合物之中間物(IX)的方法,
該方法包括如申請專利範圍第1至8項中任一項之方法中製備對映異構體純化之晶狀內酯酸辛可尼丁鹽(IV)的步驟,且將該內酯酸辛可尼丁鹽(IV)與N-甲基-己烯胺(NMHA)(VII)於醯胺形成反應中進行反應而產生二環內酯醯胺(VIII),其中該內酯基團根據下列之圖示打開而產生想要的產物(IX): 其中R1為C1-4烷基。 - 如申請專利範圍第9項之方法,其中R1為甲基。
- 一種製備化合物(I)之方法,,其包括製備如申請專利範圍第1至8項中任一項之方法中之辛可尼丁鹽(IV),
接著製備如申請專利範圍第9項之方法中之化合物(IX), 且於(I)之合成中使用化合物(IX)作為中間物。
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