最近,水性胶束介质中的光催化为激活强碳卤键开辟了广阔的途径。然而,到目前为止,它主要探索了强烈的还原条件,将可用的化学空间限制为自由基或阴离子反应性。在这里,我们展示了一种可控的光催化策略,该策略通过自由基或阳离子途径引导氯化苯甲酰胺的反应,从而实现化学发散的 C-H 芳基化或N-脱烷基化。该催化系统在温和的条件下运行,亚甲基蓝作为光催化剂,蓝色 LED 作为光源。介绍了决定底物反应性、选择性和初步机理研究的因素。
This communication describes a method for the Ni(cod)(2)-mediated intramolecular arylation of alkyl C-H bonds adjacent to the nitrogen atom in benzamide substrates. The transformation proceeds at room temperature and exhibits selectivity for functionalization of more substituted C-H bonds. The yields of the desired isoindolinone products are higher with benzamide substrates containing tertiary alkyl groups on the nitrogen atom than with those bearing primary or secondary alkyls. The results described herein suggest a mechanism involving radical intermediates for these reactions.