N4,N4-dimethyl-pteridine-2,4-diamine 、
2-异氰酸磺酰基苯甲酸甲酯 在
crystals 作用下,
以
乙腈 为溶剂,
反应 4.0h,
以to obtain 2.5 g (85% of theory) of N-(4-dimethylaminopteridin-2-yl)-N'-(2-methoxycarbonylphenylsulfonyl)-urea in the form of brownish crystals melting at 219° C.的产率得到N-(4-dimethylaminopteridin-2-yl)-N'-(2-methoxycarbonylphenylsulfonyl)-urea