A versatile route to exo-methylene butyrolactones was developed by employing a three step reaction sequence consisting of Michael addition of primary nitroalkanes 1 to ethyl (2-bromomethyl)acrylate (2), then Nef conversion of the nitro derivatives 3, and subsequent lactonization of the obtained keto esters 4. The method is chemoselective for important functionalities such as ester, C=C double bond and hydroxyl.
开发了一种多功能的路线用于exo-亚甲基丁内酯,通过采用三步反应序列实现,首先是将一烷基硝基烷1与乙基(2-
溴甲基)
丙烯酸酯2进行迈克尔加成,然后对得到的硝基衍
生物3进行内夫转化,最后对所获得的
酮酯4进行内酯化。该方法对酯、C=C双键和羟基等重要官能团具有
化学选择性。