2-chloro-6-morpholin-4-yl-N4-(2,2,2-trifluoro-ethyl)-pyrimidine-4,5-diamine   、                                                                                      
sodium nitrite                                                                                                                                                              在
                                                                                                                                                                                 
5-chloro-7-morpholin-4-yl-3-(2,2,2-trifluoro-ethyl)-3H-[1,2,3]triazolo[4,5-d]pyrimidine                                                                                                                                  作用下,
                                                                                                                                                                                                                            以to give the final product (430 mg, 68% yield)的产率得到5-chloro-7-morpholin-4-yl-3-(2,2,2-trifluoro-ethyl)-3H-[1,2,3]triazolo[4,5-d]pyrimidine