The title compound X was prepared according to the recently published procedure for preparation of analogous derivatives in the 5β-pregnane series, using the reaction sequence I -> II -> III -> IV -> V -> VI -> VII -> VII -> IX -> X (total yield 18%). The configuration at ring D centers (14β,17α) follows from the structure of the starting ketone I and was also checked by comparing diol IV with the sample prepared by an independent route. The epimeric purity at C-17 was carefully monitored during the whole synthesis by 1H NMR spectra (singlet of 18-H3).
该标题化合物X是根据最近发表的制备5β-孕烷衍
生物的程序制备的,使用反应序列I->II->III->IV->V->VI->VII->VII->IX->X(总收率18%)。环D中心(14β,17α)的构型来自起始酮I的结构,并通过与独立路线制备的二醇IV进行比较进行了检查。整个合成过程中,通过1H NMR谱(18-H3的单重峰)仔细监测了C-17的对映纯度。