Quinazolines and 1,4-Benzodiazepines. XC. 2-Aminoimidazo[1,5-a][1,4]benzodiazepin-1-ones and derivatives

The addition of diethyl azodicarboxylate to an electron rich double bond was employed as the key step for the preparation of the title compounds. Novel tetracyclic [1,2,4]triazino[1′,6′:3,4]imidazo[1,5-a][1,4]benzodiazepines were accessible from these 2-aminoimidazo[1,5-a][1,4]benzodiazepin-1-ones.