title: Bile acids. LXXIII. Synthesis of analogs of 7 alpha-hydroxy-4-cholesten-3-one as substrates for hepatic steroid 12 alpha-hydroxylase.
abstract: Analogs of 7 alpha-hydroxy-4-cholesten-3-one were prepared to ascertain structural features necessary for maximal activity of hepatic microsomal 12 alpha-steroid hydroxylase. Methyl 3 alpha,7 alpha-dihydroxy-5 beta-cholane-24-carboxylate derived from chenodeoxycholic acid was oxidized at C-3 with silver carbonate/Celite. The product was hydrolyzed and dehydrogenated with SeO2 to provide 3-oxo-7 alpha-hydroxy-4-cholene-24-carboxylic acid. 5 beta-Cholestane-3 alpha,7 alpha,25-triol and 5 beta-cholestane-3 alpha,7 alpha,12 alpha,25-tetrol were similarly oxidized at C-3 and dehydrogenated to provide 7 alpha,25-dihydroxy-4-cholesten-3-one and 7 alpha,12 alpha,25-trihydroxy-4-cholesten-3-one, respectively. The products were characterized by thin-layer and gas chromatography, ultraviolet, infrared, proton resonance and mass spectrometry.
mesh_terms: D000818:Animals; D055598:Chemical Phenomena; D002621:Chemistry; D002782:Cholestenes / Q000138:chemical synthesis*; D002783:Cholestenones / Q000138:chemical synthesis*; D066298:In Vitro Techniques; D008862:Microsomes, Liver / Q000201:enzymology*; D013253:Steroid 12-alpha-Hydroxylase / Q000378:metabolism*; D013250:Steroid Hydroxylases / Q000378:metabolism*; D013379:Substrate Specificity
chemical_list: D002782:Cholestenes; D002783:Cholestenones; D013250:Steroid Hydroxylases; D013253:Steroid 12-alpha-Hydroxylase