<i>N</i>-Acylsaccharins: Stable Electrophilic Amide-Based Acyl Transfer Reagents in Pd-Catalyzed Suzuki–Miyaura Coupling via N–C Cleavage
作者:Chengwei Liu、Guangrong Meng、Yongmei Liu、Ruzhang Liu、Roger Lalancette、Roman Szostak、Michal Szostak
DOI:10.1021/acs.orglett.6b01836
日期:2016.9.2
reported. The reaction enables preparation of a variety of functionalized diaryl and alkyl-aryl ketones with broad functional group tolerance and in good to excellent yields. Of general interest, N-acylsaccharins serve as new, highly reactive, bench-stable, economical, amide-based, electrophilic acyl transfer reagents via acyl-metal intermediates. Mechanistic studies strongly support the amide N–C(O) bond
酰胺中NC键断裂的有效催化方法的发展仍然是一个重要的合成挑战。据报道,通过选择性的N-C键活化,N-酰基糖精与硼酸的第一个Pd催化的Suzuki-Miyaura交叉偶联。该反应使得能够制备具有宽泛的官能团耐受性并且以良好至优异的产率的各种官能化的二芳基和烷基-芳基酮。普遍感兴趣的是,N-酰基糖精通过酰基金属中间体作为新型的,高反应性,稳定的,经济的,基于酰胺的亲电酰基转移试剂。机理研究强烈支持酰胺N–C(O)键扭曲是N–酰基糖精在N–C键裂解中的使能特征。