AbstractThe synergistic systems of photoredox and copper catalyst have already appeared as a novel formation of green synthetic chemistry, which open new avenues for chemical synthesis applications. We describe a novel strategy for the cyclization of alkyne‐tethered α‐bromocarbonyls initiated by the cleavage of C(sp3)−Br bond via the collaboration of photoredox and copper catalyst. The present protocol exhibits mildness using economical copper catalyst and visible‐light at room temperature. The gram‐scale and sunlight irradiation experiments proceeded smoothly to show the practicality of the methodology. It is notable that the newly generated oxygen in the product originates from H2O.
摘要 光氧化和铜催化剂的协同体系已经成为绿色合成化学的一种新形式,为化学合成应用开辟了新途径。我们介绍了一种通过光氧化和铜催化剂的协同作用,由 C(sp3)-Br 键的裂解引发的烷基系α-溴羰基环化的新策略。本方案使用经济的铜催化剂和室温下的可见光,具有温和性。克级实验和阳光照射实验的顺利进行表明了该方法的实用性。值得注意的是,产品中新生成的氧气来源于 H2O。