An efficient synthesis of 2-​aminobenzochromene derivatives catalysed by tetrabutylammoniumbromide (TBABr) under microwave irradiation in aqueous medium

Tetrabutylammonium bromide efficiently catalyzes the three-​component coupling of substituted aldehyde, α-​naphthol or β-​naphthol and malononitrile to afford the corresponding 2-​aminobenzochromene, the new protocol under microwave irradn. worked in the absence of org. solvent, the yields were high and the reactions went to completion within 2-​3 min