3β-Hydroxy-5,14-pregnadien-20-one (X) was prepared via 6β-methoxy-3α,5-cyclo-5α-pregn-14-en-20-one (VII). The compound X and its acetate XI are known intermediates in partial syntheses of digitoxigenin and xysmalogenin, respectively. In the present paper, conversion of X into the cardenolide XVII is also described.
3β-羟基-5,14-孕二烯-20-酮(X)是通过6β-甲氧基-3α,5-环-5α-孕-14-烯-20-酮(VII)制备而成。化合物X及其乙酸酯XI是毒毛毡甙和瑟伯甘毒毒素部分合成的已知中间体。本文还描述了将X转化为心苷XVII的过程。