A self-[3+2] annulation reaction of pyridinium salts has been developed for the synthesis of N-indolizine-substituted pyridine-2(1H)-ones. This protocol was carried out under mild reaction conditions without any precious catalysts in generally moderate to good yields. Additionally, a plausible mechanism for the transformation was proposed.
吡啶鎓盐的自[3+2] 环化反应已被开发用于合成N-中氮茚取代的吡啶-2(1 H )-酮。该方案是在温和的反应条件下进行的,没有任何贵重的催化剂,产率通常适中。此外,还提出了一种合理的转化机制。