Cl[C:2]1[NH:7][C:6]2[CH:8]=[C:9]([Cl:11])[S:10][C:5]=2[S:4](=[O:13])(=[O:12])[N:3]=1.[F-:14].[Cs+].O.Cl>CS(C)=O>[Cl:11][C:9]1[S:10][C:5]2[S:4](=[O:13])(=[O:12])[N:3]=[C:2]([F:14])[NH:7][C:6]=2[CH:8]=1
A mixture of 3,6-dichloro-4H-thieno[3,2-e]-1,2,4-thiadiazine 1,1-dioxide (257 mg, 1.0 mmol) and cesium fluoride (456 mg, 3.0 mmol) in dry DMSO (1 ml) was stirred for 16 h at 155° C. in a sealed flask. Water (3 ml) was added to the cooled mixture followed by 4M hydrochloric acid to pH <2. The precipitated beige solid was isolated by filtration, washed with water and dried to give 193 mg (80%) of the title compound; 1H-NMR (DMSO-d6): δ7.09 (s, 1H), 7.34 (br s, 1H; MS: m/e 240/242 (M+).
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