作者:G. Rousseau、N. Slougui
DOI:10.1016/s0040-4020(01)96367-7
日期:1985.1
with ketene alkylsilyl acetals. The best stereoselectivity was generally observed with the dimethyl tertiobutylsilyloxy group. With the chlorocarbenoid, using an E ketene acetal we obtained in majority (8̃0%) an E α,β-ethylenic ester and using a Z ketene acetal we obtained in majority (7̃0%) a Z α,β-ethylenic ester. In the case of the chloromethyl carbenoid the two ketene acetal isomers led to the same
我们已经研究了氯和氯甲基类胡萝卜素与乙烯酮烷基甲硅烷基缩醛的加成反应的立体选择性。通常在二甲基叔丁基甲硅烷基氧基上观察到最佳的立体选择性。与chlorocarbenoid,使用缩醛我们在大多数(80%)的E得到的E烯酮α,β -ethylenic酯和使用缩醛我们在大多数(70%)为Z得到为Z烯酮α,β -ethylenic酯。在氯的情况下卡宾导致相同的E两个烯酮缩醛异构体α取代的α,β -ethylenic酯(选择性88%)。与氯苯基类固醇,形成9̃0%的Eα苯基观察到α,β-乙烯酯。