THP-Protected androstan-3-ol 17β-carboxaldehydes I-III with 3β,5-ene, 3β,5α, and 3α,5α respective arrangements, were transformed into corresponding methyl Z- and E-acrylates IVa-IXa. Peterson olefination by methyl trimethylsilylacetate gave mainly Z-isomers, whereas under conditions of Wittig-Horner reaction with trimethyl phosphonoacetate E-isomers were obtained in more stereoselective manner. THP-Ethers of methyl Z-acrylates IVa, VIa, and VIIIa were deprotected and from resulting 3-hydroxy derivatives IVb, VIb, and VIIIb the hemisuccinates IVd, VId, and VIIId and β-D-glucopyranosides IVf, VIf, and VIIIf were prepared.
THP-保护的
雄甾烷-3-醇17β-羧醛 I-III,具有3β,5-ene,3β,5α和3α,5α的不同排列,被转化为相应的甲基Z-和E-
丙烯酸酯IVa-IXa。通过甲基三甲基
硅基
乙酸酯的Peterson烯化主要得到Z-异构体,而在三甲基
磷酸乙酸酯的Wittig-Horner反应条件下,以更立体选择性的方式获得了E-异构体。甲基Z-
丙烯酸酯IVa,VIa和VIIIa的THP-醚被脱保护,从产生的3-羟基衍
生物IVb,VIb和VIIIb中制备了半
琥珀酸酯IVd,VId和VIIId以及β-
D-葡萄糖苷IVf,VIf和VIIIf。