Rp. Litvinovskaya et al., Synthesis and transformations of 20-isoxazolyl steroids with modified ringD: II. Synthesis of 16 alpha-acetoxy derivatives, RUSS J ORG, 37(7), 2001, pp. 952-956
A procedure was developed for preparation of compounds of the cholestane an
d 26,27-dinor-cholestane series with 16-acetoxy-substited ring D and functi
onalized side chain, starting from 16 alpha ,17 alpha -epoxypregnenolone.