m -Chloroperbenzoic acid-oxchromium (VI)-mediated cleavage of 2,4,5-trisubstituted oxazoles
作者:Pravin C. Patil、Frederick A. Luzzio
DOI:10.1016/j.tetlet.2017.02.027
日期:2017.3
An array of 2-substituted-4,5-diphenyloxazoles were found to be cleaved to triacylamines and diacylamines (imides) using a reagent system composed of 3-chloroperbenzoic acid (MCPBA) and 2,2'-bipyridinium chlorochromate (BPCC). The 2-alkyl-4,5-diphenyloxazoles give imides (38-60%) as the predominant cleavage product while the 2-aryl-4,5-diphenyloxazoles give triacylamines (44-71%). Two mechanisms involving
发现使用由3-氯过苯甲酸(MCPBA)和2,2'-联吡啶鎓氯铬酸盐(BPCC)组成的试剂系统将一系列2-取代的4,5-二苯基恶唑裂解为三酰基胺和二酰基胺(酰亚胺)。2-烷基-4,5-二苯基恶唑产生的酰亚胺(38-60%)是主要的裂解产物,而2-芳基-4,5-二苯基恶唑产生的三酰胺(44-71%)。提出了两种涉及中间体的方法,例如环内过氧化物或氧色环。详细介绍了氧化裂解在多步合成(±)-酞酸酐I癸二酸中的应用。