4-(2'-cyclohexylamino-4-hydrazinocarbonyl-[2,4']bipyridinyl-6-yl)-piperazine-1-carboxylic acid tert-butyl ester   、                                                                                      
原甲酸三乙酯                                                                                                                                                              在
                                                                                                                                                                                 SiO2   、                                                                                                  ethyl acetate heptane   、                                                                                                  
4-(2'-cyclohexylamino-4-[1,3,4]oxadiazol-2-yl-[2,4']bipyridinyl-6-yl)-piperazine-1-carboxylic acid tert-butyl ester                                                                                                                                  作用下,
                                                                                                                                                                                        反应 6.0h,
                                                                                                                以to give the title compound 4-(2′-cyclohexylamino-4-[1,3,4]oxadiazol-2-yl-[2,4′]bipyridinyl-6-yl)-piperazine-1-carboxylic acid tert-butyl ester的产率得到4-(2'-cyclohexylamino-4-[1,3,4]oxadiazol-2-yl-[2,4']bipyridinyl-6-yl)-piperazine-1-carboxylic acid tert-butyl ester