<i>N</i>-Acylcarbazoles and <i>N</i>-Acylindoles: Electronically Activated Amides for N–C(O) Cross-Coupling by N<sub>lp</sub> to Ar Conjugation Switch
作者:Jonathan Buchspies、Md. Mahbubur Rahman、Roman Szostak、Michal Szostak
DOI:10.1021/acs.orglett.0c01488
日期:2020.6.19
development of new amide precursors for selective, catalytic activation of carbon–nitrogen bonds in amides is a fundamental objective of this emerging reactivity manifold. We report the palladium-catalyzed Suzuki–Miyaura cross-coupling of N-acylcarbazoles and N-acylindoles with arylboronic acids by a highly selective N–C(O) cleavage. The key amide bond ground-state destabilization stems from Nlp to Ar conjugation
开发新的酰胺前体用于酰胺中碳氮键的选择性催化活化是这一新兴反应性的根本目标。我们报道了N-酰基咔唑和N-酰基吲哚与芳基硼酸的钯催化的Suzuki-Miyaura交叉偶联,通过高度选择性的N-C(O)裂解。关键的酰胺键基态不稳定源于N lp到Ar的共轭作用,使我们首次实现了类似于简单苯胺中N-酰基磺酰胺和N-酰基氨基甲酸酯活化的反应性。