[Cl:1][C:2]1[N:3]([C:11]2[CH:16]=[C:15]([OH:17])[C:14]([Cl:18])=[CH:13][C:12]=2[F:19])[N:4]=[C:5]2[C:10]=1[CH2:9][CH2:8][CH2:7][CH2:6]2.[OH-].[K+].CS(C)=O.[Cl:26][CH:27]=[CH:28][CH:29](Cl)C>O>[Cl:1][C:2]1[N:3]([C:11]2[CH:16]=[C:15]([O:17][CH2:29][CH:28]=[CH:27][Cl:26])[C:14]([Cl:18])=[CH:13][C:12]=2[F:19])[N:4]=[C:5]2[C:10]=1[CH2:9][CH2:8][CH2:7][CH2:6]2
3-Chloro-2-(4-chloro-2-fluoro-5-hydroxyphenyl)-4,5,6,7-tetrahydro-2H-indazole (1 g) was suspended in a solution of potassium hydroxide (0.84 g) in water (8 ml). Dimethylsulfoxide (21 ml) was added to the suspension to make a uniform solution. To the resultant solution, 1,3-dichloro-1-butene (1.26 g) was added, and the mixture was stirred at 100° C. for 4 hours. After being allowed to cool, water was added to the mixture, which was then extracted with ethyl acetate. The organic layer was washed with water, dried and concentrated. The residue was purified by silica gel thin chromatography using a mixture of ether and hexane (1:3) as an eluent to give 3-chloro-2-[4-chloro-2-fluoro-5-(3-chloro-2-propenyloxy)phenyl]-4,5,6,7-tetrahydro-2H-indazole (0.65 g) (Compound No. 2). M.P., 68.5°-70.5° C.
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