N-(1,3-dimethyl-2,4,5-trioxo-6-amino-1,2,3,4,5,8-hexahydropyrido<2,3-d>pyrimidinyl-7)anthranilic acid methyl ester 在
sodium methylate 作用下,
以
甲醇 为溶剂,
反应 1.5h,
以87.9%的产率得到1,3-dimethyl-2,4,5,7-tetraoxo-1,2,3,4,5,6,7,13-octahydro-12H-<1,4>benzodiazepino(2',3':5,6)pyrido<2,3-d>pyrimidine