C(=O)([O-])[O-].[Ca+2].[C:6](Cl)(Cl)=[S:7].[NH2:10][C:11]1[C:19]2[S:18][C:17]([Cl:20])=[N:16][C:15]=2[C:14]([Cl:21])=[CH:13][C:12]=1[F:22]>O.ClCCl>[Cl:20][C:17]1[S:18][C:19]2[C:11]([N:10]=[C:6]=[S:7])=[C:12]([F:22])[CH:13]=[C:14]([Cl:21])[C:15]=2[N:16]=1A suspension of 16.9 g calcium carbonate in 100 ml water was added to a solution of 19.4 g thiophosgene in 100 ml dichloromethane. A solution of 40 g 7-amino-2,4-dichloro-6-fluorobenzothiazole in 500 ml dichloromethane was added, dropwise at 5° C., and the mixture stirred for 8 hours at room temperature. The solid was filtered, the phases were separated, and the organic phase dried over magnesium sulfate and concentrated. The residue was purified by column chromatography (eluent: hexane/ethyl acetate). Yield: 16 g=38% of theory m.p.: 80°-81° C.
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