Novel synthesis of 6,12-dihydroindolo[3,2-b]carbazoles catalysed by p-toluenesulfonic acid

Abstract

An efficient and straightforward procedure for the synthesis of 6,12-dihydroindolo[3,2-b]carbazoles has been achieved through the one-pot reaction of indole with aromatic aldehydes in the presence of p-toluenesulfonic acid (pTSA) as the catalyst.