α-[(3-amino-3,4-dihydro-5,6-dimethyl-4-oxo-thieno[2,3-d]pyrimidin-2-yl)thio]-phenylacetic acid methyl ester 在
sodium hydroxide 作用下,
以
甲醇 为溶剂,
反应 24.0h,
以50%的产率得到7,8-dimethyl-3-phenyl-3H,9H-thieno[2',3':4,5]pyrimido[2,1-b][1,3,4]thiadiazin-2,9-(4H)-dione