Preparation of 7α- and 7β-methylcholestane derivatives by kinetic separation of the diastereomeric mixture
摘要:
7 alpha- and 7 beta-Methyl derivatives of cholest-5-en-3 beta-ol (cholesterol), cholest-4-en-3-one and cholest-4-en-3,6-dione were prepared. Methylation of 3 alpha, 5-cyclo-5 alpha-cholestan-6-one at C-7 was followed by stereoselective reduction with LiAlH4. The key transformation was cycloreversion of the mixture of 7 alpha-methyl-3 alpha, 5-cyclo-5 alpha-cholestan-6 alpha-ol and 7 beta-methyl-3 alpha, 5-cyclo-5 alpha-cholestan-6 beta-ol. The reaction of the latter was much faster under the standard conditions enabling easy separation of the C-7 isomers. (C) 1998 Elsevier Science Ltd, All rights reserved.
New 7B-substituted-4-aza-5a-cholestan-ones as 5a-reductase inhibitors
申请人:MERCK & CO. INC.
公开号:EP0572165A1
公开(公告)日:1993-12-01
Described are new 7β-substituted 4-aza-5α-cholestan-3-ones and related compounds as 5α-reductase inhibitors.
描述了作为 5α 还原酶抑制剂的新型 7β 取代 4-氮杂-5α-胆甾烷-3-酮及相关化合物。
[EN] 7 beta -SUBSTITUTED-4-AZA-5 alpha -CHOLESTAN-3-ONES AS SELECTIVE 5 alpha -REDUCTASE 1 INHIBITORS<br/>[FR] 7 beta -SUBSTITUES-4-AZA-5 alpha -CHOLESTAN-3-ONES UTILISES COMME INHIBITEURS SELECTIFS DE LA 5 alpha -REDUCTASE 1
申请人:MERCK & CO., INC.
公开号:WO1995013077A1
公开(公告)日:1995-05-18
(EN) 7$g(b)-substituted 4-aza-5$g(a)-cholestan-3-ones and related compounds are selective inhibitors of 5$g(a)-reductase 1 useful in the treatment hyperandrogenic conditions.(FR) Les 7$g(b)-substitués-4-aza-5$g(a)-cholestan-3-ones et les composés apparentés sont des inhibiteurs sélectifs de la 5$g(a)-réductase 1 qui sont utiles dans le traitement des pathologies hyperandrogéniques.