The enzymic and chemical synthesis of ursodeoxycholic and chenodeoxycholic acid from cholic acid. 1982

J D Sutherland, and I A Macdonald, and T P Forrest

Three approaches to the synthesis of ursodeoxycholic acid (UDC) from cholic acid have been investigated: (i) oxidation of cholic acid to 3 alpha, 7 alpha-dihydroxy-12 keto-5 beta-cholanoic acid (12K-CDC) with Clostridium group P 12 alpha-hydroxysteroid dehydrogenase (HSDH), isomerization of 12K-CDC to 3 alpha, 7 beta-dihydroxy-12 keto-5 beta-cholanoic acid (12K-UDC) with Clostridium absonum 7 alpha- and 7 beta-HSDH and reduction of 12K-UDC by Wolff-Kishner to UDC; (ii) isomerization of cholic acid to ursocholic acid (UC) by C. absonum 7 alpha- and 7 beta-HSDH, oxidation of UC to 12K-UDC with Clostridium group P 12 alpha-HSDH and Wolff-Kishner reduction of 12K-UDC to UDC; (iii) oxidation of cholic acid to 12K-CDC by Clostridium group P 12 alpha-HSDH, Wolff-Kishner reduction of 12K-CDC to chenodeoxycholic acid (CDC) and isomerization of CDC to UDC using whole cell cultures of C. absonum. In the first two approaches (using cell free systems) the yields of desired product were relatively low primarily due to the formation of various side products. The third method proved the most successful giving an overall yield of 37% (UDC) whose structure was verified by mass spectroscopy of the methyl ester.

UI MeSH Term Description Entries
D007536 Isomerism The phenomenon whereby certain chemical compounds have structures that are different although the compounds possess the same elemental composition. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 5th ed) Isomerisms
D010084 Oxidation-Reduction A chemical reaction in which an electron is transferred from one molecule to another. The electron-donating molecule is the reducing agent or reductant; the electron-accepting molecule is the oxidizing agent or oxidant. Reducing and oxidizing agents function as conjugate reductant-oxidant pairs or redox pairs (Lehninger, Principles of Biochemistry, 1982, p471). Redox,Oxidation Reduction
D002478 Cells, Cultured Cells propagated in vitro in special media conducive to their growth. Cultured cells are used to study developmental, morphologic, metabolic, physiologic, and genetic processes, among others. Cultured Cells,Cell, Cultured,Cultured Cell
D002635 Chenodeoxycholic Acid A bile acid, usually conjugated with either glycine or taurine. It acts as a detergent to solubilize fats for intestinal absorption and is reabsorbed by the small intestine. It is used as cholagogue, a choleretic laxative, and to prevent or dissolve gallstones. Chenic Acid,Chenodeoxycholate,Chenodiol,Gallodesoxycholic Acid,Chenique Acid,Chenix,Chenofalk,Chenophalk,Henohol,Quenobilan,Quenocol,Sodium Chenodeoxycholate,Acid, Chenic,Acid, Chenique,Acid, Chenodeoxycholic,Acid, Gallodesoxycholic,Chenodeoxycholate, Sodium
D002793 Cholic Acids The 3 alpha,7 alpha,12 alpha-trihydroxy-5 beta-cholanic acid family of bile acids in man, usually conjugated with glycine or taurine. They act as detergents to solubilize fats for intestinal absorption, are reabsorbed by the small intestine, and are used as cholagogues and choleretics. Cholalic Acids,Acids, Cholalic,Acids, Cholic
D002855 Chromatography, Thin Layer Chromatography on thin layers of adsorbents rather than in columns. The adsorbent can be alumina, silica gel, silicates, charcoals, or cellulose. (McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed) Chromatography, Thin-Layer,Thin Layer Chromatography,Chromatographies, Thin Layer,Chromatographies, Thin-Layer,Thin Layer Chromatographies,Thin-Layer Chromatographies,Thin-Layer Chromatography
D003013 Clostridium A genus of motile or nonmotile gram-positive bacteria of the family Clostridiaceae. Many species have been identified with some being pathogenic. They occur in water, soil, and in the intestinal tract of humans and lower animals.
D003840 Deoxycholic Acid A bile acid formed by bacterial action from cholate. It is usually conjugated with glycine or taurine. Deoxycholic acid acts as a detergent to solubilize fats for intestinal absorption, is reabsorbed itself, and is used as a choleretic and detergent. Deoxycholate,Desoxycholic Acid,Kybella,Choleic Acid,Deoxycholic Acid, 12beta-Isomer,Deoxycholic Acid, 3beta-Isomer,Deoxycholic Acid, 5alpha-Isomer,Deoxycholic Acid, Disodium Salt,Deoxycholic Acid, Magnesium (2:1) Salt,Deoxycholic Acid, Monoammonium Salt,Deoxycholic Acid, Monopotassium Salt,Deoxycholic Acid, Monosodium Salt,Deoxycholic Acid, Sodium Salt, 12beta-Isomer,Dihydroxycholanoic Acid,Lagodeoxycholic Acid,Sodium Deoxycholate,12beta-Isomer Deoxycholic Acid,3beta-Isomer Deoxycholic Acid,5alpha-Isomer Deoxycholic Acid,Deoxycholate, Sodium,Deoxycholic Acid, 12beta Isomer,Deoxycholic Acid, 3beta Isomer,Deoxycholic Acid, 5alpha Isomer
D006913 Hydroxysteroid Dehydrogenases Enzymes of the oxidoreductase class that catalyze the dehydrogenation of hydroxysteroids. (From Enzyme Nomenclature, 1992) EC 1.1.-. Hydroxysteroid Dehydrogenase,Dehydrogenase, Hydroxysteroid,Dehydrogenases, Hydroxysteroid
D014580 Ursodeoxycholic Acid An epimer of chenodeoxycholic acid. It is a mammalian bile acid found first in the bear and is apparently either a precursor or a product of chenodeoxycholate. Its administration changes the composition of bile and may dissolve gallstones. It is used as a cholagogue and choleretic. Deoxyursocholic Acid,3 alpha,7 beta-Dihydroxy-5 beta-cholan-24-oic Acid,Cholit-Ursan,Cholofalk,Delursan,Destolit,Sodium Ursodeoxycholate,Urdox,Ursacholic Acid,Urso,Urso Heumann,Ursobilane,Ursochol,Ursodiol,Ursofalk,Ursogal,Ursolite,Ursolvan,3 alpha,7 beta Dihydroxy 5 beta cholan 24 oic Acid,Acid, Deoxyursocholic,Acid, Ursacholic,Acid, Ursodeoxycholic,Ursodeoxycholate, Sodium

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