Lewis acid promoted types I and II carbonyl-ene cyclizations of 2-azetidinone-tethered alkenylaldehydes are used for the rapid, highly diastereoselective synthesis of polyfunctionalized, enantiomerically pure carbacepham derivatives. [reaction: see text]
路易斯酸促进的
2-氮杂环丁酮系链的
烯基醛的I和II型羰基
烯环化反应可用于快速,高度非对映选择性地合成多官能化,对映体纯的
咔唑衍
生物。[反应:看文字]