反应详情

In a manner similar to Step C of Example 1, 8.10 g (0.0186 mole) of 1-[5-(4-amino-2-chlorophenoxy)-2,4-dichlorophenyl]-4-difluoromethyl-4,5-dihydro-3-methyl-1,2,4-triazol-5(1H)-one in 60 ml of concentrated sulfuric acid was reacted with a solution of 1.30 g (0.019 mole) of sodium nitrite in 10 ml of water. Subsequent reaction of this mixture with a refluxing solution of 150.0 g (0.60 mole) of copper (II) sulfate pentahydrate in 150 ml of water and 1.50 ml of xylene yielded 2.6 g of 1-[2,4-dichloro-5-(2-chloro-4-hydroxyphenoxy)phenyl]-4-difluoromethyl-4,5-dihydro-3-methyl-1,2,4-triazol-5(1H)-one, compound 181 of Table 1.