US2354875A - Method for recovering hydroxy-3-etiocholenic acid and its esters - Google Patents
Method for recovering hydroxy-3-etiocholenic acid and its esters Download PDFInfo
- Publication number
- US2354875A US2354875A US317608A US31760840A US2354875A US 2354875 A US2354875 A US 2354875A US 317608 A US317608 A US 317608A US 31760840 A US31760840 A US 31760840A US 2354875 A US2354875 A US 2354875A
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- Prior art keywords
- hydroxy
- esters
- acid
- acids
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- Expired - Lifetime
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- 150000002148 esters Chemical class 0.000 title description 23
- 238000000034 method Methods 0.000 title description 11
- 239000002253 acid Substances 0.000 description 40
- 150000007513 acids Chemical class 0.000 description 28
- 239000000203 mixture Substances 0.000 description 26
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 21
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 20
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 15
- 150000004702 methyl esters Chemical class 0.000 description 10
- 239000003208 petroleum Substances 0.000 description 10
- 239000002904 solvent Substances 0.000 description 10
- 239000013078 crystal Substances 0.000 description 8
- 229930195733 hydrocarbon Natural products 0.000 description 8
- 150000002430 hydrocarbons Chemical class 0.000 description 8
- 230000003647 oxidation Effects 0.000 description 8
- 238000007254 oxidation reaction Methods 0.000 description 8
- 238000011084 recovery Methods 0.000 description 8
- 238000001640 fractional crystallisation Methods 0.000 description 7
- 229930182558 Sterol Natural products 0.000 description 6
- 150000003432 sterols Chemical class 0.000 description 6
- 235000003702 sterols Nutrition 0.000 description 6
- 230000032050 esterification Effects 0.000 description 5
- 238000005886 esterification reaction Methods 0.000 description 5
- 239000004215 Carbon black (E152) Substances 0.000 description 4
- 238000009835 boiling Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- HVYWMOMLDIMFJA-DPAQBDIFSA-N cholesterol Chemical compound C1C=C2C[C@@H](O)CC[C@]2(C)[C@@H]2[C@@H]1[C@@H]1CC[C@H]([C@H](C)CCCC(C)C)[C@@]1(C)CC2 HVYWMOMLDIMFJA-DPAQBDIFSA-N 0.000 description 4
- 238000002425 crystallisation Methods 0.000 description 4
- 239000002244 precipitate Substances 0.000 description 4
- 239000011369 resultant mixture Substances 0.000 description 4
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 3
- OFBQJSOFQDEBGM-UHFFFAOYSA-N Pentane Chemical compound CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 150000001338 aliphatic hydrocarbons Chemical class 0.000 description 2
- 150000004945 aromatic hydrocarbons Chemical class 0.000 description 2
- 235000012000 cholesterol Nutrition 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 159000000000 sodium salts Chemical class 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 235000011149 sulphuric acid Nutrition 0.000 description 2
- 239000001117 sulphuric acid Substances 0.000 description 2
- VZGDMQKNWNREIO-UHFFFAOYSA-N tetrachloromethane Chemical compound ClC(Cl)(Cl)Cl VZGDMQKNWNREIO-UHFFFAOYSA-N 0.000 description 2
- HIAJCGFYHIANNA-QIZZZRFXSA-N 3b-Hydroxy-5-cholenoic acid Chemical compound C1C=C2C[C@@H](O)CC[C@]2(C)[C@@H]2[C@@H]1[C@@H]1CC[C@H]([C@@H](CCC(O)=O)C)[C@@]1(C)CC2 HIAJCGFYHIANNA-QIZZZRFXSA-N 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 241000575946 Ione Species 0.000 description 1
- LTXREWYXXSTFRX-QGZVFWFLSA-N Linagliptin Chemical compound N=1C=2N(C)C(=O)N(CC=3N=C4C=CC=CC4=C(C)N=3)C(=O)C=2N(CC#CC)C=1N1CCC[C@@H](N)C1 LTXREWYXXSTFRX-QGZVFWFLSA-N 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 239000012736 aqueous medium Substances 0.000 description 1
- 125000003118 aryl group Chemical group 0.000 description 1
- 150000001768 cations Chemical class 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- KRVSOGSZCMJSLX-UHFFFAOYSA-L chromic acid Substances O[Cr](O)(=O)=O KRVSOGSZCMJSLX-UHFFFAOYSA-L 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- -1 e. g. Natural products 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- AWJWCTOOIBYHON-UHFFFAOYSA-N furo[3,4-b]pyrazine-5,7-dione Chemical compound C1=CN=C2C(=O)OC(=O)C2=N1 AWJWCTOOIBYHON-UHFFFAOYSA-N 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002609 medium Substances 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000007127 saponification reaction Methods 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07J—STEROIDS
- C07J3/00—Normal steroids containing carbon, hydrogen, halogen or oxygen, substituted in position 17 beta by one carbon atom
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07J—STEROIDS
- C07J75/00—Processes for the preparation of steroids in general
Definitions
- I -'Thi s "invention relates to a' p r'ocess' for' recov ering hydroxy f3 etio'choleni c"acid and'it's esters from mixtureswith hoiiiologous acids:
- the hydroxy-3-etiocholenic acid an important intermediate product-"iri'-the preparation of substances showing 'a-h'orr'i'ione action, has been" 'prepared for th'ej'first tim'ebyj decompositionof hydroxy-3 -bisnorc' noiric acid ⁇ of coperiding appli cation by Rupert"O'ppenauer, Ser.”No'.
- esters of hydroxy-3-etiocholenic acid have a substantially lower solubility in organic solvents than the esters of the other acids.
- This difference in solubility appears very distinctly in solvents consisting entirely or partly of hydrocarbons.
- Particularly suitable are mixtures of aliphatic and aromatic hydrocarbons.
- aliphatic hydrocarbons the pure hydrocarbons, such as pentane, hexane and the like, may be used, but the cheaper petroleum ether consisting of a mixture of such hydrocarbons is also suitable. From the aromatic hydrocarbons benzene and toluene may be mentioned as an example.
- the ester fraction obtained by the first crystallisation is already rather pure hydroxy-B- etiocholenic acid ester; by recrystallising a number of times from the same solvent the substance is easily obtained in pure condition.
- the esters may be prepared in the usual manner, e. g., by boiling with the desired alcohol in presence of sulphuric acid, aromatic sulphonic acids such as toluene sulphonic' acid, and the like.
- the neutral esters are then freed from acids remained unesterified and/or acid esters by'means of alkali, after which they are subjected to the crystallisation as above described.
- the estersused in the examples are obtained by the oxidation of cholesterol; the method may, however, be carried out with equally good results with the acids obtained by the oxidation of other sterols.
- The'pure esters obtained may subsequently be converted into the corresponding acids by saponification.
- Example 1 The acids obtained from the insoluble sodium salts were esterified with methanol under the influence of sulphuric acid. The esters obtained'in this manner were freed from the acid components, e. g., by extraction with carbon tetrachloride from an aqueous alkaline medium, the acid components remaining in the aqueous medium.
- Example 2.-5 g. of still impure hydroxy-3- etiocholenic acid methyl ester were dissolved in cm. of toluene and 100 cm. of petroleum ether. After keeping 2 days in the refrigerator 4 g. of pure ester having a melting point of 178- 180 C. could be recovered.
- Example 3.750 g. of crude methyl esters were dissolved in a mixture of 700 cm. of toluene and 250 cm. of petroleum ether. After some days the precipitate which had formed, and which weighed 41.7 g., was recovered. From this precipitate 30 g. of pure hydroxy-3-etiocholenic acid methyl ester having a melting point of 1'78-180 C. were obtained by recrystallising twice from a mixture of toluene and petroleum ether.
- Example 4.620 g. of crude methyl esters were dissolved in a mixture of 1000 cm. of benzene and 350 cm. of petroleum ether (B. P. 40-60 C.). After being kept 3 days at room temperature the precipitate weighing 80 g. was recovered by filtration with suction and recrystallised twice from 1.
- a method for recovering hydroxy-3-etiocholenic acid and its esters from mixtures with homologous acids comprising esterification of the mixture of acids, fractional crystallisation from a solvent containing essentially at least one hydrocarbon and recovery of the hydroxy-S-tiocholenic acid ester from the first crystal fractions.
- a method for recovering hydroxy-B-etiocholenic acid and its esters from mixtures with homologous acids comprising conversion of the mixture of acids into the methyl esters, frac-' tional crystallisation from a solvent containing essentially at least one hydrocarbon and recovery of the hydroxy-3-etiocholenic acid methyl ester from the first crystal fractions.
- a method for recovering hydroxy-3-etiocholenic acid and its esters from'mixtures with homologous acids comprising esterification of the mixture of acids, fractional crystallisation from a solvent containing essentially a mixture of hydrocarbons and recovery of the hydroxy-3-etiocholenic acid ester from the first crystal fractions.
- a method for recovering hydroxy-B-etiocholenic acid andits esters from mixtures with homologous acids comprising esterification of the mixture of acids,. fractional crystallisation from a solvent consisting of a mixture of benzene and a low boiling petroleum ether and recovery of the hydroxy-3-etiocholenic acid ester from the first crystal fractions.
- a method for recovering hydroxy-B-etiocholenic acid and its esters from mixtures with homologous acids comprising conversion of the mixture of acids into the methyl esters, fractional cholenic acid and its esters comprising the steps of oxidation of sterols to obtain a resultant mix ture of acids, esterification of said mixture of acids, fractional crystallization from a solvent containing essentially at least one hydrocarbon, and recovery of the hydroxy-Zi-etiocholenic acid ester from the first crystal fractions.
- a method for obtaining hydroxy-3-etiocholenic acid and its esters comprising the steps of oxidation of sterols to obtain a resultant mixture of acids, conversion of said-mixture of acids into the methyl esters, fractional crystallization from a solvent containing essentially at least one hydrocarbon, and recovery of the hydroxy-3-etiocholenic acid methyl ester from the first crystal fractions.
- a method for obtaining hydroxY-B-etiocholenic acid and its esters comprising the steps of oxidation of sterols to obtain a resultant mixture of acids, esterification of said mixture of acids, fractional. crystallization from a solvent consisting of a mixture of benzene and a low boil ing petroleum ether, and recovery of the hydroxy- 3-etiocholenic acid ester from the first crystal fractions.
- a method for obtaining hydroxy-3-etiocholenic acid and its esters comprising the steps of oxidation of sterols to obtain a resultant mixture of acids, conversion of said mixture of acids into the methyl esters, fractional crystallization from a solvent consisting of a mixture of benzene and a low boiling petroleum ether, and recovery of the hydroxy-3-etiocholenic acid methyl ester from the first crystal fractions.
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Steroid Compounds (AREA)
Description
Patented Aug. 1, 1944 v E'rIoono Emojncme n ITS ESTERS Rupert" Oppn'auen Amsterdani,'- and Carel ,1 Christof Bolt,-, 055; Netherlands, assignors to v 4 w Jer Roche Organon Inc.,;l Iutley,-N. 3., a corpora- Nonra ing. Application February 6,1940, Serial e No. 317,608 In the Netherlands March 16, 1939 1'0 ciaihisl (omen-397.1)
I -'Thi s "invention relates to a' p r'ocess' for' recov ering hydroxy f3 etio'choleni c"acid and'it's esters from mixtureswith hoiiiologous acids: The hydroxy-3-etiocholenic acid, an important intermediate product-"iri'-the preparation of substances showing 'a-h'orr'i'ione action, has been" 'prepared for th'ej'first tim'ebyj decompositionof hydroxy-3 -bisnorc'holenic acid {of coperiding appli cation by Rupert"O'ppenauer, Ser."No'. 195,158; filed March" l0, 1938). iThisfst artmgjmaterial', however, "is; rather expensive. In the Search for another'st'arting material it appeared'that the hydroxy-3-etiocholenic acid also occurs in the acid reaction products formed by' the oxidation of sterols, e. g., cholesterol; with, chromicacid', though the British specification' No. 453,773 does not mention the hydroxy-3-etiocholenic acid'as a component of'the homologous acids occurring in the acid oxidation products.
It nowfhas been found that it' isfp'ossible to recover the desired etiof'acid from fthemixture so obtained in a'surprisingly s'imple'fmanner by subjecting 'the esters ofthese acids, preferably the methylesters, to a'dire'ct fractional crystallisation. If desired, a preliminary purification may be carried out utilising the fact that some of the acids contained in the crude mixture among which is found the hydroxy-3-etiocholenic acid, form a difficultly soluble sodium salt. For carrying out the present method, however, this preliminary purification is not essential.
We have further found that the esters of hydroxy-3-etiocholenic acid, and particularly the methyl esters, have a substantially lower solubility in organic solvents than the esters of the other acids. This difference in solubility appears very distinctly in solvents consisting entirely or partly of hydrocarbons. Particularly suitable are mixtures of aliphatic and aromatic hydrocarbons. As aliphatic hydrocarbons the pure hydrocarbons, such as pentane, hexane and the like, may be used, but the cheaper petroleum ether consisting of a mixture of such hydrocarbons is also suitable. From the aromatic hydrocarbons benzene and toluene may be mentioned as an example.
The ester fraction obtained by the first crystallisation is already rather pure hydroxy-B- etiocholenic acid ester; by recrystallising a number of times from the same solvent the substance is easily obtained in pure condition.
The esters may be prepared in the usual manner, e. g., by boiling with the desired alcohol in presence of sulphuric acid, aromatic sulphonic acids such as toluene sulphonic' acid, and the like. The neutral esters are then freed from acids remained unesterified and/or acid esters by'means of alkali, after which they are subjected to the crystallisation as above described. The estersused in the examples are obtained by the oxidation of cholesterol; the method may, however, be carried out with equally good results with the acids obtained by the oxidation of other sterols. The'pure esters obtained may subsequently be converted into the corresponding acids by saponification. Example 1.The acids obtained from the insoluble sodium salts were esterified with methanol under the influence of sulphuric acid. The esters obtained'in this manner were freed from the acid components, e. g., by extraction with carbon tetrachloride from an aqueous alkaline medium, the acid components remaining in the aqueous medium.
620 g. of the methyl esters obtained in that mar'ineewere dissolved in 1200 cm. of benzene after'which 600 cm. of petroleum ether (B. P. 40-60 C.) were added. The mixture was allowed to stand some days at room temperature, whereupon the precipitate formed was filtered off with suction and recrystallised a number of times from a mixture consisting of 2 parts of benzene and 1 part of petroleum ether. In this manner 17 g. of hydroxy-3-etiocholenic acid methyl ester having a melting point of 1'78-180 C. was obtained which appeared to be identical with the methyl ester of hydroxy-3-etiocholem'c acid obtained by decomposition of hydroxy-3-bisnorcholenic acid.
Example 2.-5 g. of still impure hydroxy-3- etiocholenic acid methyl ester were dissolved in cm. of toluene and 100 cm. of petroleum ether. After keeping 2 days in the refrigerator 4 g. of pure ester having a melting point of 178- 180 C. could be recovered.
Example 3.750 g. of crude methyl esters were dissolved in a mixture of 700 cm. of toluene and 250 cm. of petroleum ether. After some days the precipitate which had formed, and which weighed 41.7 g., was recovered. From this precipitate 30 g. of pure hydroxy-3-etiocholenic acid methyl ester having a melting point of 1'78-180 C. were obtained by recrystallising twice from a mixture of toluene and petroleum ether.
Example 4.620 g. of crude methyl esters were dissolved in a mixture of 1000 cm. of benzene and 350 cm. of petroleum ether (B. P. 40-60 C.). After being kept 3 days at room temperature the precipitate weighing 80 g. was recovered by filtration with suction and recrystallised twice from 1. A method for recovering hydroxy-3-etiocholenic acid and its esters from mixtures with homologous acids, comprising esterification of the mixture of acids, fractional crystallisation from a solvent containing essentially at least one hydrocarbon and recovery of the hydroxy-S-tiocholenic acid ester from the first crystal fractions.
2. A method for recovering hydroxy-B-etiocholenic acid and its esters from mixtures with homologous acids, comprising conversion of the mixture of acids into the methyl esters, frac-' tional crystallisation from a solvent containing essentially at least one hydrocarbon and recovery of the hydroxy-3-etiocholenic acid methyl ester from the first crystal fractions.
3. A method for recovering hydroxy-3-etiocholenic acid and its esters from'mixtures with homologous acids, comprising esterification of the mixture of acids, fractional crystallisation from a solvent containing essentially a mixture of hydrocarbons and recovery of the hydroxy-3-etiocholenic acid ester from the first crystal fractions.
4. A method for recovering hydroxy-B-etiocholenic acid andits esters from mixtures with homologous acids, comprising esterification of the mixture of acids,. fractional crystallisation from a solvent consisting of a mixture of benzene and a low boiling petroleum ether and recovery of the hydroxy-3-etiocholenic acid ester from the first crystal fractions. 1
5. A method for recovering hydroxy-B-etiocholenic acid and its esters from mixtures with homologous acids; comprising conversion of the mixture of acids into the methyl esters, fractional cholenic acid and its esters comprising the steps of oxidation of sterols to obtain a resultant mix ture of acids, esterification of said mixture of acids, fractional crystallization from a solvent containing essentially at least one hydrocarbon, and recovery of the hydroxy-Zi-etiocholenic acid ester from the first crystal fractions.
8. A method for obtaining hydroxy-3-etiocholenic acid and its esters comprising the steps of oxidation of sterols to obtain a resultant mixture of acids, conversion of said-mixture of acids into the methyl esters, fractional crystallization from a solvent containing essentially at least one hydrocarbon, and recovery of the hydroxy-3-etiocholenic acid methyl ester from the first crystal fractions.
9. A method for obtaining hydroxY-B-etiocholenic acid and its esters comprising the steps of oxidation of sterols to obtain a resultant mixture of acids, esterification of said mixture of acids, fractional. crystallization from a solvent consisting of a mixture of benzene and a low boil ing petroleum ether, and recovery of the hydroxy- 3-etiocholenic acid ester from the first crystal fractions.
10. A method for obtaining hydroxy-3-etiocholenic acid and its esters, comprising the steps of oxidation of sterols to obtain a resultant mixture of acids, conversion of said mixture of acids into the methyl esters, fractional crystallization from a solvent consisting of a mixture of benzene and a low boiling petroleum ether, and recovery of the hydroxy-3-etiocholenic acid methyl ester from the first crystal fractions.
RUPERT OPPENAUER. CAREL CHRISTOF' BOLT.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL2354875X | 1939-03-16 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US2354875A true US2354875A (en) | 1944-08-01 |
Family
ID=19874141
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US317608A Expired - Lifetime US2354875A (en) | 1939-03-16 | 1940-02-06 | Method for recovering hydroxy-3-etiocholenic acid and its esters |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US2354875A (en) |
-
1940
- 1940-02-06 US US317608A patent/US2354875A/en not_active Expired - Lifetime
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