Nickel-Catalyzed Sonogashira C(sp)–C(sp<sup>2</sup>) Coupling through Visible-Light Sensitization
作者:Da-Liang Zhu、Ruijie Xu、Qi Wu、Hai-Yan Li、Jian-Ping Lang、Hong-Xi Li
DOI:10.1021/acs.joc.0c01177
日期:2020.7.17
efficient method for visible-light-initiated, nickel-catalyzed Sonogashira C(sp)–C(sp2) coupling has been developed via an energy-transfer mode. Thioxanthen-9-one as a photosensitizer could significantly accelerate the arylation of alkynes with a wide range of (hetero)aryl halides in high yields. The cross-coupling reaction undergoes the stepwise oxidative addition of an arylhalide to nickel(0), transmetalation
通过能量转移模式已经开发出一种有效的方法,用于可见光引发的镍催化的Sonogashira C(sp)–C(sp 2)耦合。噻吨酮-9-一作为光敏剂可以以高产率显着促进炔烃与各种(杂)芳基卤化物的芳基化。交叉偶联反应经历了将芳基卤化物逐步氧化添加到镍(0)上,将所得的芳基–镍(II)卤化物与乙酰化锌(II)过渡金属化为芳基–镍(II)乙酰化物,能量从噻吨酮9-1的激发态变成芳基– Ni(II)乙炔化物,并还原消除为芳基炔烃。