2-chloro-9-cyclobutyl-7,7-difluoro-5-methyl-8,9-dihydro-5H-pyrimido[4,5-b][1,4]diazepin-6(7H)-one 、
对氨基苯甲酸 在
水 、 silica gel 、 Dichloromethane methanol ammonium hydroxide 作用下,
以
Ethanol water hydrochloric acid 为溶剂,
反应 18.0h,
以to give 1.600 g of 4-(9-cyclobutyl-7,7-difluoro-5-methyl-6-oxo-6,7,8,9-tetrahydro-5H-pyrimido[4,5-b][1,4]diazepin-2-ylamino)-benzoic acid (I-11)的产率得到4-(9-cyclobutyl-7,7-difluoro-5-methyl-6-oxo-6,7,8,9-tetrahydro-5H-pyrimido[4,5-b][1,4]diazepin-2-ylamino)-benzoic acid