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.