3,5-dichloro-4-[1-[5-(2-methylphenyl)-1,2,4-oxadiazol-3-yl]-1-methylethyl]benzenamine   、                                                                                      
盐酸   、                                                                                      
sodium nitrite   、                                                                                      
sodium acetate   、                                                                                      
(1,3-二氧代丙烷-1,3-二基)双氨基甲酸二乙酯                                                                                                                                                              在
                                                                                                                                                                                 
二氯甲烷   、                                                                                                  
diethyl N,N'-[2-[[3,5-dichloro-4-[1-[5-(2-methylphenyl)-1,2,4-oxadiazol-3-yl]-1-methylethyl]phenyl]hydrazono]-1,3-dioxo-1,3-propanediyl]dicarbamate                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
溶剂黄146   、                                                                                         
水                                                                                  为溶剂,
                                                                                                                                                    反应 2.0h,
                                                                                                                以yielding diethyl N,N′-[2-[[3,5-dichloro-4-[1-[5-(2-methylphenyl)-1,2,4-oxadiazol-3-yl]-1-methylethyl]phenyl]hydrazono]-1,3-dioxo-1,3-propanediyl]dicarbamate (intermediate 20)的产率得到diethyl N,N'-[2-[[3,5-dichloro-4-[1-[5-(2-methylphenyl)-1,2,4-oxadiazol-3-yl]-1-methylethyl]phenyl]hydrazono]-1,3-dioxo-1,3-propanediyl]dicarbamate