Syntheses of new 5,6,7,8-tetrahydropyrrolo [2,3-d]azepine ring system.

A first synthesis of pyrrolo[2,3-d]azepine ring system starting from pyrrole and perhydroazepine derivatives was reported. In addition, Lansbury's reaction is developed through the use of para-toluene sulphonic acid (p-TsOH) as a new catalyst for this reaction.