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CN105237603B - A kind of method with stigmasterol as Material synthesis cholesterol - Google Patents

A kind of method with stigmasterol as Material synthesis cholesterol Download PDF

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CN105237603B
CN105237603B CN201510713730.0A CN201510713730A CN105237603B CN 105237603 B CN105237603 B CN 105237603B CN 201510713730 A CN201510713730 A CN 201510713730A CN 105237603 B CN105237603 B CN 105237603B
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stigmasterol
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CN105237603A (en
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左前进
甘红星
谢来宾
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Hunan Kerey Pharmaceutical Co Ltd
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Abstract

A kind of method with stigmasterol as Material synthesis cholesterol, specially:(1) stigmasterol generates sulphonic acid ester with benzene sulfonyl chloride reaction, and sulphonic acid ester adds potassium acetate back flow reaction to obtain compound 03 in methyl alcohol;(2) there is oxidation reaction in compound 03 and ozone, gained reactant liquor again with zinc powder, glacial acetic acid reacts, and obtains compound 04;(3) triphenylphosphine and 1 halo, 3 methybutane react to obtain 3 methyl butyl triphenyl phosphonium halides phosphines;3 methyl butyl triphenyl phosphonium halides phosphines generate wittig reagents with highly basic reaction, and wittig reagents occur wittig reactions with compound 04, obtain compound 05;(4) there is hydrogenation in compound 05 under catalyst action, obtain compound 06;(5) there is hydrolysis in compound 06, obtain cholesterol 01, and the method is with stigmasterol as initiation material, cheap and easy to get, process is simple, and consumption supplementary material is few, and high income, low cost, environmental protection are easy to industrialized production.

Description

A kind of method with stigmasterol as Material synthesis cholesterol
Technical field
A kind of the present invention relates to cholesterol biosynthesis technical field, more particularly to side with stigmasterol as Material synthesis cholesterol Method.
Background technology
It is Material synthesis cholesterol also known as cholesterine, a kind of derivative of cyclopentanoperhy drophenanthrene with stigmasterol.Early in 18 generation Discipline people have been found that from cholelith with stigmasterol as Material synthesis cholesterol, and chemist in 1816 is by this tool lipid nature Material is named as with stigmasterol as Material synthesis cholesterol.Animal body is widely present in as Material synthesis cholesterol with stigmasterol Interior, especially enriched in brain and nerve fiber the most, in kidney, spleen, skin, liver and bile, content is also high.With stigmasterol as raw material Synthetic cholesterol is the indispensable important substance of institute of animal tissue cell, and it is not only involved in forming cell membrane, and is synthesis The raw material of bile acid, vitamin D and steroid hormone.
At present, cholesterol is mainly and extracts from the brain and vertebra of the animals such as pig, ox, sheep, due to rabid ox disease and pig hammer The appearance that bacterium catches, people generate suspection to the safety in utilization for coming from animal cholesterol, need a kind of safer Synthetic cholesterol synthetic method.
Content of the invention
It is an object of the invention to provide a kind of method with stigmasterol as Material synthesis cholesterol, the reaction mechanism mechanism of reaction is:
Specifically include following steps:
(1) stigmasterol 02 generates sulphonic acid ester with benzene sulfonyl chloride or paratoluensulfonyl chloride reaction, and the sulphonic acid ester is in methyl alcohol Plus potassium acetate or sodium acetate back flow reaction, compound 03 is purified to obtain after reaction completely;
(2) there is oxidation reaction with ozone in the compound 03, and gained reactant liquor is reacted with reducing agent again, after reaction completely Purify to obtain compound 04;
(3) triphenylphosphine reacts to obtain 3- methyl butyl triphenyl phosphonium halides phosphines with 1- halo -3- methybutanes;The 3- methyl Butyl triphenyl phosphonium halides phosphine generates wittig reagents with highly basic reaction, and it is anti-that the wittig reagents occur wittig with compound 04 Should, compound 05 is obtained after reaction completely after purification;
(4) there is hydrogenation in the compound 05 under catalyst action, through purifying to obtain compound 06 after reaction completely;
(5) there is hydrolysis in the compound 06, purify to obtain cholesterol 01 after reaction completely.
Preferably, the concrete operations of step (1) are:The concrete operations of step (1) are:With molar ratio computing, stigmasterol 02:Benzene Sulfonic acid chloride or paratoluensulfonyl chloride:Potassium acetate or sodium acetate=1:(1.1-1.3):(3-5), by stigmasterol 02, benzene sulfonyl chloride or Paratoluensulfonyl chloride, pyridine react at room temperature, obtain sulphonic acid ester, the sulphonic acid ester is dissolved in methyl alcohol after reaction completely, add Potassium acetate or sodium acetate, to reacting completely, concentration crystallizes to obtain compound 03 to heating reflux reaction.Wherein, potassium acetate or sodium acetate Can not only neutralization reaction generate sulfonic acid, play acid-base buffer agent, additionally with certain catalyst effect.
Preferably, the concrete operations of step (2) are:With molar ratio computing, compound 03:Reducing agent=1:(6-8), by chemical combination Thing 03 is dissolved in solvent, is cooled to -50~-80 DEG C, is passed through ozone reaction, after reaction completely, by reacting liquid temperature recover to Room temperature, addition reducing agent continue reaction, obtain compound 04 after reaction completely.
It is further preferred that the solvent is dichloromethane, and acetone, one or more in dichloroethanes, further Preferably dichloromethane.
The reducing agent is reducing agent commonly used in the art, such as zinc powder or dimethyl sulphide, more preferably zinc powder.More Further, in order to improve the reducing activity of zinc powder, the reaction system of reduction reaction will keep acid, for this purpose, can be to reaction Acid solution is added in liquid, and the acid solution is acid solution commonly used in the art, such as hydrochloric acid, sulfuric acid, glacial acetic acid, the one kind or many in phosphoric acid Plant, preferably glacial acetic acid, more preferably, compound 03 is 1g with the mass volume ratio of glacial acetic acid:1mL.
Preferably, the concrete operations of step (3) are:With molar ratio computing, compound 04:Triphenylphosphine:1- halo -3- methyl Butane:Highly basic=1:(1.5-3.0):(1.5-3.0):(1.8-3.6), triphenylphosphine is added in anhydrous aprotic solvent, plus Enter 1- halo -3- methybutanes, heating reflux reaction under oxygen free condition is cooled to less than 20 DEG C after reaction completely, adds highly basic, Compound 04, under oxygen free condition, heating reflux reaction is complete to reaction;Less than 10 DEG C are finally cooled to, and pH are adjusted to neutrality, are removed Solvent is removed, compound 05 is obtained.
It is further preferred that the solvent is toluene, and tetrahydrofuran, one or more in glycol dimethyl ether, preferably For toluene.
It is further preferred that the 1- halos -3- methybutanes are 1- bromo -3- methybutanes or 1- chloro -3- methyl One or two in butane, preferably 1- chloros -3- methybutanes.
It is further preferred that the highly basic is potassium tert-butoxide, and sodium tert-butoxide, one or more in butyl lithium, preferably Potassium tert-butoxide.
It is further preferred that adjusting pH value using industrial concentrated hydrochloric acid or the concentrated sulfuric acid.
Preferably, in step (4), the catalyst is palladium-carbon catalyst, and concrete operations are:With molar ratio computing, compound 05:Palladium=1:(0.01-0.03), in solvent, palladium-carbon catalyst and compound 05 is added, under oxygen free condition, is passed through hydrogen, React under the conditions of 40-60 DEG C to reaction completely, concentrated, crystallize to obtain compound 06.
It is further preferred that the solvent is ethanol, and glacial acetic acid, dichloromethane, toluene, tetrahydrofuran, glycol dinitrate One or more in ether, preferably ethanol.
It is further preferred that the palladium-carbon catalyst adopt palladium content for 5% wet palladium carbon, 5% refer to palladium-carbon catalyst in Metal Palladium accounts for the percentage by weight of whole palladium-carbon catalyst.
Preferably, the concrete operations of step (5) are:Compound 06 is dissolved in solvent, under the conditions of 45-55 DEG C, is added dropwise 98% concentrated sulfuric acid, insulation reaction after completion of dropwise addition, after reaction completely, remove solvent and obtain compound 01, wherein, compound 06 with The mass volume ratio of 98% concentrated sulfuric acid is:100g:(3-8)mL.
It is further preferred that the solvent be dioxane, glacial acetic acid, ethanol, in tetrahydrofuran one or more with The mixed solvent of water composition, the mixed solvent for still more preferably constituting for dioxane and water, most preferably, for raising The solute effect of compound, is conducive to that reacted fully to carry out, and solvent is dioxane and water with 3:The mixing of 2 volume ratio composition Solvent.
Most preferably scheme of the invention, a kind of with stigmasterol as the method for Material synthesis cholesterol, comprise the steps:
(1) with molar ratio computing, stigmasterol 02:Benzene sulfonyl chloride or paratoluensulfonyl chloride:Potassium acetate=1:(1.1-1.3):(3- 5), by stigmasterol 02, benzene sulfonyl chloride or paratoluensulfonyl chloride, pyridine react at room temperature, reaction completely sulphonic acid ester, will be described Sulphonic acid ester is dissolved in methyl alcohol, adds potassium acetate, and to reacting completely, concentration crystallizes to obtain compound 03 to heating reflux reaction;
(2) with molar ratio computing, compound 03:Zinc powder=1:(6-8), compound 03 is dissolved in dichloromethane, is lowered the temperature To -50~-80 DEG C, ozone reaction is passed through, after reaction completely, reacting liquid temperature is recovered to room temperature, zinc powder and glacial acetic acid is added, React under room temperature condition, after reaction completely, remove zinc powder, obtain compound 04, wherein, the quality volume of compound 03 and glacial acetic acid Than for 1g:1mL.
(3) with molar ratio computing, compound 04:Triphenylphosphine:1- chloro -3- methybutanes:Potassium tert-butoxide or sodium tert-butoxide =1:(1.5-3.0):(1.5-3.0):(1.8-3.6), triphenylphosphine is added in dry toluene, 1- chloro -3- methyl is added Butane, heating reflux reaction under oxygen free condition are cooled to less than 20 DEG C after reaction completely, add potassium tert-butoxide or sodium tert-butoxide, Compound 04, heating reflux reaction under oxygen free condition, after reaction completely, are cooled to less than 10 DEG C, adjust pH to neutrality, remove molten Agent, obtains compound 05;
(4) with molar ratio computing, compound 05:5% palladium carbon=1:(0.01-0.03), in ethanol, 5% palladium carbon is added to urge Agent and compound 05, under oxygen free condition, are passed through hydrogen up to 2-4 atmospheric pressure, react under the conditions of 40-60 DEG C, and reaction is completely Afterwards, concentrated, crystallize to obtain compound 06;
(5) compound 06 is dissolved in the mixed solvent of dioxane and water composition, under the conditions of 45-55 DEG C, is added dropwise 98% The concentrated sulfuric acid, insulation reaction after completion of dropwise addition, after reaction completely, remove solvent and obtain compound 01, wherein, compound 06 plus and 98% The mass volume ratio of the concentrated sulfuric acid is 100g:3-8mL 98%.
Specific embodiment
Following examples are used for the present invention to be described, but are not limited to the scope of the present invention.
Embodiment 1
A kind of with stigmasterol as the method for Material synthesis cholesterol, comprise the steps:
(1) add pyridine 500mL in the reaction bulb of 1000mL, 02 100g of stigmasterol, paratoluensulfonyl chloride 47g are stirred at room temperature Reaction 24 hours, reactant liquor is poured in a large amount of frozen water, separates out a large amount of solids, is filtered, is washed with clear water, drain to obtain intermediate sulfonic acid Ester, sulphonic acid ester wet product is dissolved in the methyl alcohol of 1000mL, plus potassium acetate 72g, and reactant liquor is heated to reflux 2 hours, is evaporated to 200ml methyl alcohol is about remained, and freezing and crystallizing obtains 03 96.87g of compound, molar yield 93.69%;
(2) 03 20g of compound is dissolved in the dichloromethane of 1000mL, is cooled to -70 DEG C, is slowly passed through ozone and (is used Ozone machine produces ozone), reaction end is monitored with HPLC or TLC, and reaction completely, makes reacting liquid temperature recover to room temperature, plus , in room temperature reaction (25 DEG C) 3 hours, reaction is completed, and is filtered to remove zinc powder, and filtrate is washed 2 times for 18.4g zinc powders and 20mL glacial acetic acid, Dense dry to obtain 04 14.12g of compound, molar yield 87.43%.
(3) in 2000mL glass reaction bottles, plus toluene 1200mL, stirring, plus triphenylphosphine 63g, it is heated to backflow and steams The moisture gone out in toluene.Stop heating, nitrogen protection is cooled to less than 40 DEG C, plus the chloro- 3- methybutanes 26g of 1-, after adding, then Heating reflux reaction 2 hours;
Stop heating, nitrogen protection is cooled to less than 20 DEG C, is incubated gradation plus potassium tert-butoxide 32g, after stirring 30 minutes, plus 04 54g of compound, after adding, reheats back flow reaction 4 hours.TLC monitors reaction end, and after reaction completely, ice-water bath is lowered the temperature To less than 10 DEG C, it is slowly added to, in the acid solution of ice-water bath cooling (running water 500ml, the industrial concentrated hydrochloric acid 39g for plus 30%), adjust PH is stirred 30 minutes to neutrality, and normal pressure is concentrated into solvent-free smell, is cooled to less than 40 DEG C, is filtered, is washed to neutrality, drains, Dry, obtain 05 57.31g of compound, molar yield 91.73%.
(4) in the stainless steel hydrogenation reaction cauldron of 3000mL, palladium-carbon catalyst 2g, 05 200g of compound and the second of plus 5% Alcohol 2000mL, nitrogen displacement 3 times lead to hydrogen up to 3 atmospheric pressure, react 12 hours at 50 DEG C, after completion of the reaction, stop insulation, Row's hydrogen, with nitrogen displacement, filters, then is washed with a small amount of ethanol, filtrate reduced in volume to small size, freezing and crystallizing, filter, then Washed with ethanol, drained, obtain compound (06) 185.27g, molar yield 92.17%.
(5) in the reaction bulb of 1000mL, plus dioxane 300ml, water 200ml, stirring, 98% concentrated sulfuric acid 5ml is added dropwise, Plus 05 100g of compound, 50 DEG C are reacted 3 hours, and decompression steams dioxane, and add water 500ml, filters, washs, drains, obtains courage 01 94.32g of sterol, molar yield 97.74%.
Embodiment 2
A kind of method with stigmasterol as Material synthesis cholesterol, with embodiment 1, which differs only in synthetic method:
In step (1), benzene sulfonyl chloride, the consumption of potassium acetate are respectively 52g and 95g, obtain 03 96.64g of compound, mole Yield 93.46%.
In step (2), the consumption of zinc powder is 21.5g, obtains 04 14.25g of compound, molar yield 88.23%.
In step (3), triphenylphosphine, the chloro- 3- methybutanes of 1-, potassium tert-butoxide, the consumption difference of 30% industrial concentrated hydrochloric acid For 94g, 39g, 48g, 58g, compound 05 57.66%, molar yield 92.29% is obtained.
In step (4), 5% palladium-carbon catalyst consumption is 4g, obtains 06 185.92g of compound, molar yield 92.50%.
In step (5), solvent dioxane is substituted for glacial acetic acid, obtains 01 94.55g of compound, molar yield 97.98%.
Embodiment 3
A kind of method with stigmasterol as Material synthesis cholesterol, with embodiment 1, which differs only in synthetic method:
In step (1), benzene sulfonyl chloride, the consumption of potassium acetate are respectively 56g and 119g, obtain 03 96.02g of compound, mole Yield 92.86%.
In step (2), the consumption of zinc powder is 24.5g, obtains 04 14.28g of compound, molar yield 88.42%.
In step (3), triphenylphosphine, the chloro- 3- methybutanes of 1-, the consumption of potassium tert-butoxide are respectively 125g, 58g, 42.5g, the concentrated sulfuric acid that 30% industrial concentrated hydrochloric acid is substituted for 32g 98%, obtains 05 57.51g of compound, molar yield 92.05%.
In step (4), 5% palladium-carbon catalyst consumption is 6g, obtains 06 186.12g of compound, molar yield 92.59%.
In step (5), solvent dioxane is substituted for tetrahydrofuran, obtains 01 94.41g of compound, molar yield 97.83%.
Embodiment 4
A kind of method with stigmasterol as Material synthesis cholesterol, with embodiment 1, which differs only in synthetic method:Step Suddenly in (4), dioxane is substituted for ethanol, obtains 01 93.94g of compound, molar yield 97.35%.
Although, general explanation, specific embodiment and test has above been used, the present invention has been made to retouch in detail State, but on the basis of the present invention, it can be made some modifications or improvements, this is apparent to those skilled in the art 's.Therefore, these modifications or improvements without departing from theon the basis of the spirit of the present invention, belong to claimed Scope.

Claims (13)

1. a kind of method with stigmasterol as Material synthesis cholesterol, it is characterised in that synthesis equation is:
Specifically include following steps:
(1) stigmasterol 02 generates sulphonic acid ester with benzene sulfonyl chloride or paratoluensulfonyl chloride reaction, and the sulphonic acid ester is dissolved in methyl alcohol and adding Potassium acetate or sodium acetate back flow reaction, purify to obtain compound 03 after reaction completely;
(2) with molar ratio computing, compound 03:Reducing agent=1:(6-8), compound 03 is dissolved in solvent, -50 are cooled to ~-80 DEG C, ozone reaction is passed through, after reaction completely, reacting liquid temperature is recovered to room temperature, add reducing agent to continue reaction, instead Compound 04 is obtained after answering completely;The reducing agent is zinc powder or dimethyl sulphide;
(3) with molar ratio computing, compound 04:Triphenylphosphine:1- halo -3- methybutanes:Highly basic=1:(1.5-3.0):(1.5- 3.0):(1.8-3.6), triphenylphosphine is added in anhydrous aprotic solvent, 1- halo -3- methybutanes, oxygen free condition is added Lower heating reflux reaction, is cooled to less than 20 DEG C after reaction completely, adds highly basic, compound 04 to be heated to reflux under oxygen free condition React to reaction completely;Less than 10 DEG C are finally cooled to, and pH are adjusted to neutrality, are removed solvent, obtain compound 05;
(4) there is hydrogenation in the compound 05 under palladium-carbon catalyst effect, through purifying to obtain compound 06 after reaction completely;
(5) compound 06 is dissolved in solvent, under the conditions of 45-55 DEG C, 98% concentrated sulfuric acid of dropwise addition, insulation reaction after completion of dropwise addition, After reaction completely, remove solvent and obtain compound 01, wherein, compound 06 with the mass volume ratio of 98% concentrated sulfuric acid is:100g: (3-8)mL.
2. method according to claim 1, it is characterised in that:The concrete operations of step (1) are:With molar ratio computing, beans steroid Alcohol 02:Benzene sulfonyl chloride or paratoluensulfonyl chloride:Potassium acetate or sodium acetate=1:(1.1-1.3):(3-5), by stigmasterol 02, benzene sulphur Acyl chlorides or paratoluensulfonyl chloride, pyridine react at room temperature, obtain sulphonic acid ester, the sulphonic acid ester is dissolved in methyl alcohol after reaction completely In, potassium acetate or sodium acetate is added, to reacting completely, concentration crystallizes to obtain compound 03 to heating reflux reaction.
3. method according to claim 1, it is characterised in that:In step (2), the solvent be dichloromethane, acetone, two One or more in chloroethanes.
4. method according to claim 3, it is characterised in that:The solvent is dichloromethane.
5. the method according to any one of claim 1-3, it is characterised in that:In step (2), the reducing agent is zinc powder.
6. method according to claim 1, it is characterised in that:In step (3), the solvent be toluene, tetrahydrofuran, second One or more in glycol dimethyl ether;1- halos -3- the methybutanes are 1- bromo -3- methybutanes or 1- chloro -3- One or two in methybutane, and/or, the highly basic is potassium tert-butoxide, sodium tert-butoxide, the one kind or many in butyl lithium Kind.
7. method according to claim 6, it is characterised in that:The solvent is toluene.
8. method according to claim 1, it is characterised in that:The concrete operations of step (4) are:With molar ratio computing, chemical combination Thing 05:Palladium=1:(0.01-0.03), in solvent, palladium-carbon catalyst and compound 05 is added, under oxygen free condition, is passed through hydrogen, React under the conditions of 40-60 DEG C to reaction completely, concentrated, crystallize to obtain compound 06.
9. method according to claim 8, it is characterised in that:The solvent be ethanol, glacial acetic acid, dichloromethane, toluene, Tetrahydrofuran, one or more in glycol dimethyl ether;And/or, the palladium-carbon catalyst is 5% palladium-carbon catalyst.
10. method according to claim 9, it is characterised in that:The solvent is ethanol.
11. methods according to claim 1, it is characterised in that:In step (5), the solvent is dioxane, ice vinegar Acid, ethanol, one or more mixed solvents with water composition in tetrahydrofuran.
12. methods according to claim 11, it is characterised in that:The solvent is the mixed solvent of dioxane and water.
13. methods according to claim 1, it is characterised in that comprise the steps:
(1) with molar ratio computing, stigmasterol 02:Benzene sulfonyl chloride or paratoluensulfonyl chloride:Potassium acetate=1:(1.1-1.3):(3-5), Stigmasterol 02, benzene sulfonyl chloride or paratoluensulfonyl chloride, pyridine are reacted at room temperature, reaction obtains sulphonic acid ester completely, by the sulphur Acid esters is dissolved in methyl alcohol, adds potassium acetate, and to reacting completely, concentration crystallizes to obtain compound 03 to heating reflux reaction;
(2) with molar ratio computing, compound 03:Zinc powder=1:(6-8), compound 03 is dissolved in dichloromethane, -50 are cooled to ~-80 DEG C, ozone reaction is passed through, after reaction completely, reacting liquid temperature is recovered to room temperature, zinc powder and glacial acetic acid, room temperature is added Under the conditions of react, after reaction completely, remove zinc powder, obtain compound 04, wherein, the mass volume ratio of compound 03 and glacial acetic acid For:1g:1mL;
(3) with molar ratio computing, compound 04:Triphenylphosphine:1- chloro -3- methybutanes:Potassium tert-butoxide or sodium tert-butoxide=1: (1.5-3.0):(1.5-3.0):(1.8-3.6), triphenylphosphine is added in dry toluene, 1- chloro -3- methybutanes are added, Heating reflux reaction under oxygen free condition, is cooled to less than 20 DEG C after reaction completely, adds potassium tert-butoxide or sodium tert-butoxide, compound 04, heating reflux reaction under oxygen free condition, after reaction completely, is cooled to less than 10 DEG C, adjusts pH to neutrality, removes solvent, obtain Compound 05;
(4) with molar ratio computing, compound 05:5% palladium carbon=1:(0.01-0.03), 5% palladium-carbon catalyst is added in ethanol With compound 05, under oxygen free condition, hydrogen is passed through up to 2-4 atmospheric pressure, is reacted under the conditions of 40-60 DEG C, after reaction completely, warp Concentration, crystallizes to obtain compound 06;
(5) compound 06 is dissolved in the mixed solvent of dioxane and water composition, under the conditions of 45-55 DEG C, 98% dense sulphur is added dropwise Acid, insulation reaction after completion of dropwise addition, after reaction completely, remove solvent and obtain compound 01, wherein, compound 06 plus and 98% dense sulphur The mass volume ratio of acid is 100g:3-8mL.
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CN109021059A (en) * 2017-06-09 2018-12-18 郑州泰丰制药有限公司 Ring cholane carboxylic ester derivative and its preparation method and application
CN111320664B (en) * 2018-12-13 2023-01-24 上海医药工业研究院 A kind of preparation method of ethyl 24-choleenoic acid
CN111320663B (en) * 2018-12-13 2023-01-24 上海医药工业研究院 A kind of preparation method of ethyl 24-cholenoic acid intermediate
WO2021005618A1 (en) * 2019-07-09 2021-01-14 Fermenta Biotech Limited Synthesis of cholesterol and vitamin d3 from phytosterols
WO2021120127A1 (en) 2019-12-19 2021-06-24 湖南科瑞生物制药股份有限公司 Method for preparing cholesterol, derivative and analogue thereof
CN112745253B (en) * 2021-02-07 2023-03-14 成都健腾生物技术有限公司 Preparation of vitamin D from stigmasterol 3 Is a new method for industrialization
CN114524856B (en) 2022-01-27 2024-03-15 华东师范大学 Synthesis method of high-purity plant-derived cholesterol
CN114395009B (en) 2022-01-27 2024-02-27 华东师范大学 A kind of synthesis method of high-purity cholesterol
CN115555034B (en) * 2022-10-17 2023-08-18 湖南科瑞生物制药股份有限公司 Composite catalyst for converting carbonyl into methylene and preparation method for efficiently catalyzing synthesis of cholesterol by composite catalyst
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CN104961788A (en) * 2015-06-25 2015-10-07 湖南科瑞生物科技股份有限公司 Synthetic method of cholesterol

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Denomination of invention: A method for synthesizing cholesterol from stigmasterol as raw material

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