[Cl:1][C:2]1[CH:3]=[C:4]([N:19]2[C:24](=[O:25])[NH:23][C:22](=[O:26])[C:21](C(O)=O)=[N:20]2)[CH:5]=[C:6]([Cl:18])[C:7]=1[CH:8]([C:11]1[CH:16]=[CH:15][C:14]([Cl:17])=[CH:13][CH:12]=1)[C:9]#[N:10].SCC(O)=O.C(=O)([O-])O.[Na+]>O>[Cl:18][C:6]1[CH:5]=[C:4]([N:19]2[C:24](=[O:25])[NH:23][C:22](=[O:26])[CH:21]=[N:20]2)[CH:3]=[C:2]([Cl:1])[C:7]=1[CH:8]([C:11]1[CH:16]=[CH:15][C:14]([Cl:17])=[CH:13][CH:12]=1)[C:9]#[N:10]A mixture of 11.1 parts of 2-[3,5-dichloro-4-[(4-chlorophenyl)cyanomethyl]phenyl]-2,3,4,5-tetrahydro-3,5-dioxo-1,2,4-triazine-6-carboxylic acid (intermediate 5) and 15 parts of 2-mercaptoacetic acid is stirred and heated for 2 hours at 180 degrees C. The reaction mixture is cooled, water is added and the whole is treated with sodium hydrogen carbonate. The product is extracted with trichloromethane. The organic layer is dried, filtered and evaporated. The residue is purified by column chromatography over silica gel using a mixture of trichloromethane and methanol (95:5 by volume) as eluent. The pure fractions are collected and the eluent is evaporated in vacuo. The residue is stirred in 2,2'-oxybispropane. The product is filtered off and dried, yielding 2,6-dichloro-α-(4-chlorophenyl)-4-(4,5-dihydro-3,5-dioxo-1,2,4-triazin-2(3H)-yl)benzeneacetonitrile.
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