Vinyl substituted (1R,2S)-amino alcohols 5 were obtained by addition of vinyl magnesium bromide to the corresponding cyanohydrin O-trimethylsilyl ethers (R)-2. The O- and N-protected vinyl amino alcohols 6 were ozonized at −78°C in methanol yielding (1R,2S)-2-amino-1,3-diols7 in high enantiomeric and diastereomeric excesses. For purification, compounds 7 in some cases were acetylated to give the derivatives
通过将
乙烯基溴化镁加到相应的
氰醇O-三甲基甲
硅烷基醚(R)-2中,获得
乙烯基取代的(1 R,2 S)-
氨基醇5。的ø -和ñ -保护的
乙烯基氨基醇6在-78℃在
甲醇中
臭氧化得到(1 - [R,2小号)-2-
氨基-1,3
-二醇7高对映体和非对映过量。为了纯化,在某些情况下将化合物7乙酰化,得到衍
生物(1R,2S)-8 。外消旋体6a通过在-78°C下在
甲醇的NaOH溶液中进行氧化
臭氧分解将其转化为相应的N-乙酰基-β-羟基
丙酸甲酯9a。通过X射线晶体学分析证实了(1R,2S)-8a的构型。