Synthesis of 3-Acyloxyindolenines by TiCl<sub>3</sub>-Mediated Reductive Cyclization of 2-(<i>ortho</i>-Nitroaryl)-Substituted Enol Esters
作者:Dina V. Boyarskaya、Alberto Ongaro、Cyril Piemontesi、Qian Wang、Jieping Zhu
DOI:10.1021/acs.orglett.2c02860
日期:2022.9.30
In the presence of TiCl3, the reductive cyclization of tetrasubstituted enol esters bearing a 2-(ortho-nitroaryl) substituent affords 3-acyloxy-2,3-disubstituted indolenines in good yields. A domino process involving the partial reduction of nitro to a nitroso group followed by 5-center-6π-electrocyclization, 1,2-acyloxy migration, and the further reduction of the resulting nitrone intermediate accounts