Synthesis of β-lactams and β-aminoesters via high intensity ultrasound-promoted Reformatsky reactions
作者:Nathan A. Ross、Robert R. MacGregor、Richard A. Bartsch
DOI:10.1016/j.tet.2004.01.002
日期:2004.2
Reformatsky reactions of an imine, an α-bromoester, zinc dust and a catalytic amount of iodine in dioxane under high intensity ultrasound (HIU) irradiation from an ultrasonic probe are explored. A series of 16 aldimines with varying electronic demands is evaluated as potential electrophiles for reactions with three α-bromoesters of differing steric demands. This HIU method is successful for both enolizable
探索了在超声探头的高强度超声(HIU)辐射下,二恶烷中亚胺,α-溴代酸酯,锌粉和催化量碘的重整反应。一系列16种具有不同电子需求的醛亚胺被评估为与三种具有不同空间需求的α-溴代酸酯反应的潜在亲电子试剂。该HIU方法对于可缩合和不可缩合的亚胺都是成功的,这取决于亚胺和α-溴酸酯的特性,在短的反应时间内提供高产率的β-内酰胺,相应的β-氨基酯或两种产物的混合物。