Condensed 1,3,5-triazepines-III. Derivatives of 4,5-dihydro-[1,3,5]triazepino[1,2-a]benzimidazole

Abstract Methods have been developed for the synthesis of 2-amino-1-(2-aminoethyl)-benzimidazoles 10 . By ring closures with the aid of suitable C 1 -components, derivatives 11a–c, 13–15 of the novel [1,3,5]triazepino[1,2- a ] benzimidazole ring system have been obtained.