Novel Ring Transformations of 4-Acylamino- and 4-Dimethylaminomethyleneamino-1H-1,5-benzodiazepine-3-carbonitriles to Pyrimidine-5-carbonitriles - Takagi, Kaname; Aotsuka, Tomoji; Morita, Hikari; Okamoto, Yoshihisa (Synthesis, 1987)