N'-[3-(4-chloro-phenyl)-1H-pyrazolo[3,4-d]pyrimidin-4-yl]-N,N-dimethyl-formamidine   、                                                                                      
异氰酸乙酯                                                                                                                                                              在
                                                                                                                                                                                 
丙酮                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
1,4-二氧六环                                                                                  为溶剂,
                                                                                                                                                    反应 11.0h,
                                                                                                                以to afford 3-(4-chlorophenyl)-4-(dimethylamino-methyleneamino)-pyrazolo[3,4-d]pyrimidine-1-carboxylic acid ethylamide (180 mg, 0.48 mmol)的产率得到3-(4-chlorophenyl)-4-(dimethylamino-methyleneamino)-pyrazolo[3,4-d]pyrimidine-1-carboxylic acid ethylamide