Direct N-acylation of azoles via a metal-free catalyzed oxidative cross-coupling strategy
作者:Jingjing Zhao、Pan Li、Chungu Xia、Fuwei Li
DOI:10.1039/c4cc01587h
日期:——
The KI-catalyzed N-acylation of azoles via direct oxidative coupling of C–H and N–H bonds has been developed. It could be smoothly scaled up to gram synthesis of acyl azoles. The reaction occurred by the coupling of acyl radicals and azoles to form the acyl azole radical anion, followed by its further oxidation.
DMAPO/Boc<sub>2</sub>O‐Mediated One‐Pot Direct <i>N</i>1‐Acylation of Indazole with Carboxylic Acids: A Practical Synthesis of <i>N</i>1‐Functionalized Alkyl Indazoles
作者:Atsushi Umehara、Soma Shimizu、Makoto Sasaki
DOI:10.1002/ejoc.202400123
日期:——
We describe the one-pot direct N-acylation of indazole with carboxylic acids using DMAPO/Boc2O system. This system is simple and provides N1-acyl indazoles in high yield with high N1 selectivities. This new method exhibits a wide substrate scope (>40 examples). In addition, a new synthesis of N1-functionalized alkyl indazoles utilizing N1-acyl indazoles as starting materials was achieved.