A Novel Dieckmann-Type Cyclization, the Final Step of the Synthesis of a Carbacephem Derivative
作者:Gebhard Neyer、Ivar Ugi
DOI:10.1055/s-1991-26563
日期:——
The treatment of the triacylamine, methyl 4-(dibenzoylaminocarbonylethyl)-2-oxoazetidine-1-acetate (2), with sodium bis(trimethylsilyl)amide leads to an unprecedented Dieckmann-type ring closure to form the anion of the carbacephem derivative, methyl 3-hydroxy-1-carbacephem-4-carboxylate, (3).
用双(三甲基硅烷基)酰胺钠处理 4-(二苯甲酰基氨基羰基乙基)-2-氧代氮杂环丁烷-1-乙酸甲酯(2)的三酰氨基,会导致前所未有的迪克曼式闭环,形成碳杂环丁烷衍生物--3-羟基-1-碳杂环丁烷-4-甲酸甲酯(3)的阴离子。