Reaction of silyl ketene acetals with epoxides: a new method for the synthesis of γ-butanolides
作者:Veselin Maslak、Radomir Matović、Radomir N. Saičić
DOI:10.1016/j.tet.2004.07.007
日期:2004.9
Titanium tetrachloride promoted reaction of silyl ketene acetals with epoxides, followed by acidic work-up, affords butanolides in moderate/good yields. With epihalohydrins the reaction is regioselective and occurs at the less substituted end of the epoxide; the γ-haloalkyl-γ-butanolides thus obtained can be further transformed into various products.
四氯化钛促进了甲硅烷基乙烯酮缩醛与环氧化物的反应,然后进行酸性处理,以中等/良好的收率得到丁醇化物。与表卤代醇反应是区域选择性的,发生在环氧化物的取代度较低的末端。由此获得的γ-卤代烷基-γ-丁醇化物可以进一步转化为各种产物。