A protocol for single-carbon atom doping annulation is reported, which enables the conversion of acrylamides into homologated γ-lactams through the cleavage of two σ-bonds and the formation of four new σ-bonds at the single carbon center. The key strategy is the use of N-heterocyclic carbenes as an atomic carbon equivalent by acting as carbon atom donors through the loss of a 1,2-diimine moiety. Experimental
报道了单碳原子掺杂环化的方案,该方案能够通过两个σ键的裂解并在单碳中心形成四个新的σ键,将
丙烯酰胺转化为同系的γ-内酰胺。关键策略是通过失去 1,2-二
亚胺部分而充当碳原子供体,从而使用N-杂环卡宾作为原子碳当量。实验和计算研究表明,该反应通过螺环中间体进行,然后通过质子转移分解N-杂环卡宾骨架。