化学
表面改性
催化作用
电化学
炔烃
铱
组合化学
废止
有机化学
高分子化学
电极
物理化学
作者
Qi-Liang Yang,Yi-Kang Xing,Xiang-Yang Wang,Hong-Xing Ma,Xin-Jun Weng,Xiang Yang,Hai-Ming Guo,Tian-Sheng Mei
摘要
Synergistic use of electrochemistry and organometallic catalysis has emerged as a powerful tool for site-selective C-H functionalization, yet this type of transformation has thus far mainly been limited to arene C-H functionalization. Herein, we report the development of electrochemical vinylic C-H functionalization of acrylic acids with alkynes. In this reaction an iridium catalyst enables C-H/O-H functionalization for alkyne annulation, affording α-pyrones with good to excellent yields in an undivided cell. Preliminary mechanistic studies show that anodic oxidation is crucial for releasing the product and regeneration of an Ir(III) intermediate from a diene-Ir(I) complex, which is a coordinatively saturated, 18-electron complex. Importantly, common chemical oxidants such as Ag(I) or Cu(II) did not give significant amounts of the desired product in the absence of electrical current under otherwise identical conditions.
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