Microwave-assisted synthesis of azepines via nucleophilic aromatic substitution

A novel and efficient route has been developed to afford 5 H -dipyridoazepine derivatives from primary amines and 3,3'-( Z )-ethene-1,2-diylbis(4-chloropyridine). The protocol based on the double nucleophilic aromatic substitution provides a valuable synthetic tool for the synthesis of dipyridoazepines. The reaction proceeds without catalyst, under microwave irradiation condition.