Novel A-nor sterols: Synthesis and stereochemistry
作者:S PRADHAN、V GIRIJAVALLABHAN
DOI:10.1016/s0039-128x(69)80056-5
日期:1969.1
Abstract A new and simple method of synthesis of A-nor sterols having a tertiary hydroxylgroup allylic to an exocyclic methylene is described consisting of utilization of the Eschenmoser Fragmentation of αβ -epoxy ketones and the Stork Ring-closure of acetylenic ketones. 4 β ,5 β -epoxycholestan-3-one gave 3-methylene-A-nor-cholestan-5 β -ol together with 3-methyl-A-nor-cholest-3-ene (III). The structure