Direct preparation of 14β-hydroxy steroids from 14α-H compounds is described; a 15β-hydroxy-14α-H compound is also obtained. Grignard reagents react with 14β-hydroxy-androstan-17-one in the “normal way”, giving a 17β-side chain, but surprisingly organolithium reagents give the unexpected 17α-side chain.
Studies in the steroid group. Part LXXXIV. Preparation and reactions of 15-oxygenated androstanes
作者:I. M. Clark、W. A. Denny、Ewart R. H. Jones、G. D. Meakins、A. Pendlebury、J. T. Pinhey
DOI:10.1039/p19720002765
日期:——
Treatment of 15β, 16β-epoxy-5α-androstan-17-one with hydrazine and toluene-p-sulphonic acid in air gives 5α-androstan-15β-ol; this step markedly improves the chemical route to 5α-androstan-15-one from the 3-ketone. The 15-ketone is also readily obtained from 12β,15α-dihydroxy-5α-androstan-3-one (prepared by microbiological hydroxylation of 5α-androstan-3-one).Two series of substituted (mainly oxygenated)