Investigating the Ritter Type Reaction of α-Methylene-β-hydroxy Esters in Acidic Medium: Evidence for the Intermediacy of an Allylic Cation
作者:Marcus M. Sá、Misael Ferreira、Giovanni F. Caramori、Laize Zaramello、Adailton J. Bortoluzzi、Deonildo Faggion、Josiel B. Domingos
DOI:10.1002/ejoc.201300035
日期:2013.8
investigated. The reaction was shown to involve nucleophilic attack either at the terminal methylene or at the benzylic carbon. Kinetic and theoretical studies were performed to elucidate the possible pathways involved in the formation of the acetamide products, i.e., through an addition-elimination mechanism, a concerted process (SN2 and SN2′), or involving an allylic cation (SN1 and SN1′). The results
研究了酸介导的 α-亚甲基-β-羟基酯在乙腈中的溶剂分解转化。表明该反应涉及末端亚甲基或苄基碳的亲核攻击。进行了动力学和理论研究以阐明参与乙酰胺产物形成的可能途径,即通过加成消除机制、协同过程(SN2 和 SN2')或涉及烯丙基阳离子(SN1 和 SN1') . 动力学分析的结果,包括同位素效应、Hammett 图和 Eyring 图,与形成苄基碳鎓离子中间体之前的质子转移平衡一致,这与单分子逐步机制一致。DFT 理论水平的理论检验证实了这些发现,