text] A highly useful method for the construction of polycyclic compounds based on the amine-controlled exo- and endo-selective cyclizations of omega-alkynyl silyl enol ethers catalyzed by W(CO)5L is reported. When bis-alkynyl silyl enol ethers were treated with a catalytic amount of W(CO)6, DABCO, and water under photoirradiation, synthetically useful tricyclic ketones were obtained in good yield.
[反应:见正文]据报道,一种基于W(CO)5L催化的由胺控制的ω-炔基甲
硅烷基烯醇醚的外向和内向选择性环化的
多环化合物的构建非常有用的方法。当在光辐照下用催化量的W(CO)6,
DABCO和
水处理双炔基甲
硅烷基烯醇醚时,可以良好的收率获得合成上有用的
三环酮。