Microwave-induced bismuth(III)-catalyzed synthesis of linear indoloquinolines

Abstract Microwave-induced Bi(NO 3 ) 3 -catalyzed one-pot synthesis of a series of linear indoloquinolines is accomplished under mild reaction conditions. While majority of these examples were carried out under solvent-free conditions, in a few cases, minimal quantity of THF is used as solvent. The methodology involves several unique reaction pathways, providing different linear indolo[2,3- b ]quinolines in good yields from readily available starting materials and using environmentally benign Bi(NO 3 ) 3 ·5H 2 O as catalyst.