1,3-Transposition, using the epoxidation of the allylsilane 7, derived from the meso 3,4-disilylated adipate 1, gives the 1,4-related stereocentres of 8-oxo-6-hydroxy-3-dimethyl(tolyl)silylnonanoic acid ethylene acetal 10; two highly stereocontrolled sequences from this common intermediate give methyl (+)-nonactate 13 and benzyl (â)-nonactate 17.
1,3-通过环氧化从 3,4-二
硅烷化
己二酸中酯 1 中得到的烯丙基
硅烷 7,进行 1,4-转位,得到 8-氧代-6-羟基-3-二甲基(
甲苯基)
硅壬酸乙烯缩醛 10 的 1,4 相关立体中心;从这一常见中间体的两个高度立体控制序列得到(+)-
壬酸甲酯 13 和(-)-
壬酸苄酯 17。