[Studies on 1-azabicyclo compounds. XX. Synthesis of hexahydroisoquino-(3,2-c)(1,4)benzodiazepine and related compounds and formation of 6-methyl-hexahydro-5H-dibenzo(b,g)(1,5)diazacycloundecine from hexahydroisoquino(3,2-c)(1,4)-benzodiazepin-13-one (author's transl)].