4-chloro-1,6-dimethyl-3-(5-nitro-2-furyl)-1H-pyrazolo[3,4]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