Cascade Vinyl Radical Ipso-Cyclization Reactions and the Formation of α,β-Unsaturated-β-aryl-γ-lactams from <i>N</i>-Propargyl Benzamides
作者:Chih-Hao Luo、Pei-Ling Wang、Che-Chien Chang
DOI:10.1021/acs.joc.1c01717
日期:2021.11.5
production of a series of α,β-unsaturated-β-aryl-γ-lactam derivatives. This new type of radical reaction was examined from the substituent effects on both the amino groups and the aryl groups. A bulky tert-butyl substituent on the amino group enhanced the formation of a Z-conformation of the benzamides and facilitated vinyl radical ipso-cyclization reactions. A synthetic method for preparing α,β-un
各种N- (2-溴-烯丙基) 苯甲酰胺被用作研究乙烯基自由基环化反应的起始材料。乙烯基自由基经历了同位环化、断裂和环化反应以产生 β-芳基-γ-内酰胺,羰基保持完整。为了进一步研究这种级联自由基反应,通过将三丁基锡自由基添加到炔烃部分,生成乙烯基自由基,然后进行自由基同环化、断裂、环化和β-断裂反应,产生一系列α,β-不饱和-β-芳基-γ-内酰胺衍生物。这种新型的自由基反应是从取代基对氨基和芳基的影响来检验的。氨基上的大叔丁基取代基增强了a的形成苯甲酰胺的Z构象和促进乙烯基自由基同环化反应。建立了以N-炔丙基苯甲酰胺为原料制备α,β-不饱和-β-芳基-γ-内酰胺的合成方法。