title: Improved preparation of pregn-5-ene-3 beta,16 alpha,20-triols and 5 alpha-pregnane-3 alpha,16 alpha,20-triols.
abstract: The compounds named in the title were prepared by routes which included the reduction of suitable 16 alpha,17-epoxypregnan-20-ones with aluminium amalgam to give 16 alpha-hydroxypregnan-20-ones, and reduction of the 20-oxo function either with sodium borohydride to obtain the 3,16 alpha,20 beta-triols or with lithium-liquid ammonia to obtain the 3,16 alpha,20 alpha-triols.
mesh_terms: D006914:Hydroxysteroids / Q000138:chemical synthesis / Q000652:urine; D011279:Pregnanetriol / Q000138:chemical synthesis* / Q000652:urine; D011283:Pregnenes / Q000138:chemical synthesis* / Q000652:urine; D012015:Reference Standards; D013237:Stereoisomerism
chemical_list: D006914:Hydroxysteroids; D011283:Pregnenes; D011279:Pregnanetriol