Exploiting Synergistic Catalysis for an Ambient Temperature Photocycloaddition to Pyrazoles
作者:Christopher P. Lakeland、David W. Watson、Joseph P. A. Harrity
DOI:10.1002/chem.201904210
日期:2020.1.2
Sydnone-based cycloaddition reactions are a versatile platform for pyrazole synthesis, however they operate under harsh conditions (high temperature and long reaction times). Herein we report a strategy that addresses this limitation utilizing the synergistic combination of organocatalysis and visible-light photocatalysis. This new approach proceeds under ambient conditions and with excellent levels
基于Sydnone的环加成反应是吡唑合成的通用平台,但是它们在苛刻的条件下(高温和长反应时间)运行。本文中,我们报告了一种利用有机催化和可见光光催化的协同组合解决这一局限性的策略。这种新方法在环境条件下进行,并且具有极好的区域控制能力。机理研究表明,光敏的sydnones(而不是烯胺)是成功实施该过程的关键。