Pindur, Ulf; Schall, Thomas, Liebigs Annalen der Chemie, 1993, # 10, p. 1099 - 1104
作者:Pindur, Ulf、Schall, Thomas
DOI:——
日期:——
US3994936A
申请人:——
公开号:US3994936A
公开(公告)日:1976-11-30
US4059575A
申请人:——
公开号:US4059575A
公开(公告)日:1977-11-22
Process for the preparation of 17(20)ene-21-steroid aldehydes
申请人:Research Corporation
公开号:US04059575A1
公开(公告)日:1977-11-22
There is disclosed a process for the efficient conversion of 17-.alpha.-ethynyl 17-.beta.- hydroxy steroids into the corresponding 17(20) .alpha..beta.-unsaturated 21-steroid aldehydes. The process comprises the sequential steps of reacting the ethynyl alcohol with a diloweralkylformamide dilower-alkylacetal, suitably dimethylformamide diethylacetal, to form the corresponding 16,20 diene-21-diloweralkylamine which is then hydrolyzed to form the corresponding 17(20)-ene-21-steroid aldehyde.