Synthesis of bridged steroids with a bicyclo [3.3.1.] nonane ring a system.
作者:Marian Kocór、Beata Bersz
DOI:10.1016/s0040-4020(01)86794-6
日期:1987.1
A synthesis of new groups of bicyclic steroids with a bicyclo [3.3.1.] nonane ring A system is described. The insertion of an additional ring is performed by means of the Michaeladdition of ethyl acetoacetate to 17β-propionoxyandrosta-1,4,6-triene-3-one , followed by an aldol condensation of intermediate 17β- propionoxy-1 -(1'Ξ-carboxyethylo-2'-oxo-propano)-androsta-4,6-diene-3-one to give 17β-propionate