A stereoselective synthetic method for the title compounds, E- and Z- allylsilanes, which would be generally applicable for the preparation of other trisubstituted allylsilanes, has been elaborated. The key steps are the following: (i) stereoselective preparation of (2Z)- and (2E)-3-[(diethoxy)phosphoryloxy]-2-octenoates (Z)- and (E)- 4, (ii) substitution of 3-phosphoryloxy group with methyl in the presence of palladium catalyst [(Z/E)-4 → (E/Z)-5]; and (iii) substitution reaction of the desired allyl chlorides with appropriate silyllithiums [(E/Z)-7 → (E/Z)-8].
本文详细阐述了一种立体选择性合成方法,用于合成标题化合物 E-和 Z-烯丙基
硅烷,该方法一般适用于制备其他三取代烯丙基
硅烷。关键步骤如下(i) 立体选择性制备 (2Z)- 和 (2E)-3-[(diethoxy)phosphoryloxy]-2-octenoates (Z)- 和 (E)- 4,(ii) 在
钯催化剂存在下用甲基取代 3-
磷酰氧基[(Z/E)-4→(E/Z)-5];(iii) 将所需的烯丙基
氯与适当的
水苏鎓进行取代反应[(E/Z)-7→(E/Z)-8]。