Investigation of various organocatalysts for improved and efficient one pot synthesis of 2,3-Dihydro-1H-1,5-benzodiazepines under solvent-free condition

Abstract

A series of 2,3-dihydro-1H-1,5-benzodiazepines derivatives were synthesized by one-pot three-components condensation reaction of o-phenylenediamines with α,β-unsaturated carbonyl compounds and effect of various Brønsted organo acids as catalyst was studied. Among the various organo acids screened, trifluoroacetic acid is versatile catalyst and the corresponding products were obtained in good to excellent yield (84-94 %) under solvent-free condition.