Asymmetric synthesis of disubstituted C-silylated homoallylic alcohols from lithiated allylic and vinylic sulfoximines
作者:Hans-Joachim Gais、Harald Müller、Jürgen Decker、Rüdiger Hainz
DOI:10.1016/0040-4039(95)01554-x
日期:1995.10
hydroxyalkylation of allylic N-methyl sulfoximines 1–4 gave with ≥ 95% de the anti-Z-configurated homoallylic alcohols 5–9. Lithiation of 6b and 8b with MeLi readily produced the lithiated vinylic sulfoximines (Z)-12 and (Z)-13, respectively. Ni-catalyzed substitution of (Z)-12 and (Z)-13 with PhLi and 1,5-silyl migration yielded with ≥ 98% de the disubstituted C-silylated homoallylic alcohols (Z)-14 and (Z)-15
锂化,钛和烯丙基N-甲基亚磺酰亚胺的羟烷基化1-4与≥95%,得到解的防Z -构型高烯丙醇5-9。用MeLi将6b和8b锂化,分别容易地产生锂化的乙烯基亚砜亚砜(Z)-12和(Z)-13。镍催化的(取代Ž) - 12和(Ž) - 13用PhLi和1,5-甲硅烷迁移与≥98%,得到DE的二取代C-甲硅烷基化高烯丙醇(Ž) -分别为图14和(Z)-15。(ž) - 15由此从(获得Ž) - 13有一个EE的≥98百分数。