Construction of benzo[a]carbazole derivatives via Diels–Alder reaction of arynes with vinylindoles†
Abstract
A new protocol for a highly efficienct and versatile Diels–Alder reaction of vinylindoles with arynes (generated form 2-(trimethylsilyl)aryl triflate) has been developed. Various functionalized benzo[a]carbazoles were afforded in good to perfect yields via [4 + 2] cycloaddition/aromatization.