FC(F)(F)C(O)=O.[NH2:8][CH2:9][CH2:10][C:11]1[N:16]=[C:15]([C:17]2[S:18][C:19]3[CH:27]=[CH:26][CH:25]=[CH:24][C:20]=3[C:21](=[O:23])[N:22]=2)[CH:14]=[CH:13][CH:12]=1.C(=O)([O-])[O-].[K+].[K+].[CH3:34][N:35]([CH3:39])[C:36](Cl)=[O:37]>C(#N)C>[CH3:34][N:35]([CH3:39])[C:36]([NH:8][CH2:9][CH2:10][C:11]1[CH:12]=[CH:13][CH:14]=[C:15]([C:17]2[S:18][C:19]3[CH:27]=[CH:26][CH:25]=[CH:24][C:20]=3[C:21](=[O:23])[N:22]=2)[N:16]=1)=[O:37]A mixture of 2-[6-(2-aminoethyl)-2-pyridyl]-4H-1,3-benzothiazine-4-one trifluoroacetic acid salt (0.45 g, 1.1 mmol), potassium carbonate (0.46 g, 3.3 mmol) and acetonitrile (20 ml) was stirred at room temperature for 20 minutes. Successively N,N-dimethylcarbamoyl chloride (0.47 g, 4.3 mmol) was added to the mixture, and the mixture was stirred at room temperature for 3 hrs. The precipitates were filtered, and the filtrate was concentrated. The residue was subjected to a silica gel column chromatography. The fractions eluted with chloroform-ethanol (20:1, v/v) were collected, concentrated and recrystallized from chloroform-hexane to give the titled compound (0.31 g, 77%) as white crystals.
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