Synthesis of 21-Aryl and Heteroaryl Ethisterones and the Corresponding A-Ring Substituted [2,3-<i>d</i>]lsoxazoles
作者:Virendra Kumar、Alicia B. Todaro
DOI:10.1055/s-1992-26151
日期:——
Palladium(0) catalyzed coupling reaction of ethisterone [6; (17α)-17-hydroxypregn-4-en-20-yn-3-one] with aromatic/heteroaromatic halides gave C-21 substituted derivatives 7. Hydroxymethylation of the latter compounds followed by treatment with hydroxylamine hydrochloride resulted in the formation of 21-substituted (17α)-pregna-2,4-dien-20-yno[2,3-d]isoxazol-17-ols 3.