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mail:  E Abstract: A simple and convenient approach for the synthesis of tetraheterocyclic benzimidazolo(2,3 b)quinazolin1ones has been developed via a multicomponent reaction, which involves the condensation of 2aminobenzimidazole, dimedone and various aldehydes using chitosansupported metal nanocomposite as a green, reusable and environmentally benign catalyst system. Environmental friendly, recyclability, costeffectiveness, easy workup and excellent yields are the major attributes of this onepot procedure.

A three-component one-pot procedure for the synthesis benzimidazolo-quinazolinone derivatives in the presence of chitosan-supported metal nanocomposite as a green and reusable catalyst