Steroid Series. XVI. The Preparation of 3α, 5α-Cyclo-6β, 19-oxidosteroids and its Conversion to 19-Oxygenated Steroid Derivatives
作者:Katsumi Tanabe、Rinji Takasaki、Kiyoshi Sakai、Ryozo Hayashi、Yasuhiro Morisawa、Teruo Hashimoto
DOI:10.1248/cpb.15.15
日期:——
3α, 5α-Cyclo-6β, 19-oxidosteroid (II) was synthesized by the lead tetraacetate oxidation of 3α, 5α-cyclo-6β-hydroxysteroid (I) in benzene. The acid-catalysed solvolysis of the oxide (II) afforded 3α, 5α-cyclo-19-hydroxy-6β-substituted steroid (XVI) and/or Δ5-19-hydroxy-3β-substituted steroid (XVII), depending upon the reaction conditions employed. Oxidation of the oxide (II) with Jones reagent gave 3α, 5α-cyclo-6β, 19-dioxosteroid (XIX) with two equivalent molar oxidant, and 3α, 5α-cyclo-6-oxosteroid-19-oic acid (XX) with the excess reagent.
3α, 5α-环-6β, 19-氧化类固醇(II)是通过四乙酸铅在苯中氧化3α, 5α-环-6β-羟基类固醇(I)合成的。氧化物(II)的酸催化溶剂解提供3α,5α-环-19-羟基-6β-取代的类固醇(XVI)和/或Δ5-19-羟基-3β-取代的类固醇(XVII),取决于反应采用的条件。用琼斯试剂氧化氧化物(II),得到3α,5α-环-6β,19-二氧类固醇(XIX)和两个当量摩尔氧化剂,以及3α,5α-环-6-氧类固醇-19-油酸(XX)多余的试剂。