作者:Scott E. Denmark、Russell C. Klix
DOI:10.1016/s0040-4020(01)86655-2
日期:1988.1
A new modification of the silicon-directed Nazarov cyclization is described which involves the cyclization of divinyl ketones incorporating an allylsilane as the control unit. The cyclizations are extremely facile with FeCl3 or BF3·OEt2 as the Lewis acid. Four permutations of five- and six-membered ring substrates have been examined. In all cases the reactions are regio- and stereoslective. In the
描述了对硅定向的Nazarov环化的一种新的改进,其中涉及以烯丙基硅烷为控制单元的二乙烯基酮的环化。用FeCl 3或BF 3 ·OEt 2作为路易斯酸,环化反应非常容易。已经检查了五元和六元环底物的四个排列。在所有情况下,反应都是区域性和立体选择性的。在6-5-6(6ba)和5-5-6(6ba)系统中,主要产品具有反跨配置。已经解决了在双键和环中引入甲基取代基的能力。