4-chloro-1,6-dimethyl-3-(5-nitro-furan-2-yl)-1H-pyrazolo[3,4-d]pyrimidine 、
4-chloro-1-methyl-3-(5-nitro-furan-2-yl)-1H-pyrazolo[3,4-d]pyrimidine 在
水 、
N,N-二甲基甲酰胺 作用下,
以gave 4-amino-1,6-dimethyl-3-(5-nitro-2-furyl)-1H-pyrazolo[3,4-d]pyrimidine having decomposition point > 300° C. identical with the product obtained in Example 2的产率得到1,6-dimethyl-3-(5-nitro-furan-2-yl)-1
H-pyrazolo[3,4-
d]pyrimidin-4-ylamine