Gold-catalyzed aerobic oxidations of -iminoalkynes with aryl aldehydes led to oxidative 1,3-hydroacyclation reactions, yielding high Z-selectivity. We performed 2H- and 18O-labeling experiments to confirm the role of water as an oxygen donor and O2 as the main oxidant. The Z-selectivity arises from an efficient conjugation between the enone and its aryl substituent. We postulate an initial [4+2]-annulation
金催化的-亚
氨基
炔烃与芳基醛的需氧氧化导致氧化的1,3-氢环化反应,产生高的Z选择性。我们进行了2H和18O标记实验,以确认
水作为
氧气供体和O2作为主要氧化剂的作用。Z-选择性源自烯酮及其芳基取代基之间的有效共轭。我们假设-亚
氨基
炔烃与醛的初始[4 + 2]环化反应形成六元的氧鎓类物质,该类物质受到
水的攻击,然后对关键中间体进行O2氧化。