Facile synthesis of model 1,4‐dihydro‐1
H
‐1,3,4‐benzotriazepin‐5‐ones
摘要:
Abstract2‐Aminobenzoic acid reacts readily, in the presence of triethylamine, with hydrazonoyl chlorides (5a‐c) (precursors of the reactive nitrile imine 1,3‐dipolar species) to afford high yields of the corresponding acyclic amidrazone adducts (6a‐c). The latter adducts undergo, in THF in presence of 1,1‐carbonyldiimida‐zole, smooth intramolecular cyclization involving the activated carboxyl and the NH‐ termini to deliver unequivocally the respective dihydro‐1,3,4‐benzotriazepin‐5‐ones (7a‐c).
Synthesis of 4-Aryl-1,3,4-benzotriazepinones from Isatoic Anhydrides and Hydrazonyl Chlorides
作者:Xinyu Zhang、Yuan Pan、Tao Liu、Yang Wang
DOI:10.1021/acs.joc.3c00307
日期:2023.6.2
An efficient synthesis of 4-aryl-1,3,4-benzotriazepinones from readily available isatoic anhydrides and hydrazonylchlorides was developed. In this facile protocol, a series of functionalized 1,3,4-benzotriazepinones were conveniently obtained with broad substrate scope and excellent functional group tolerance.