2-[6-(Aminomethyl)-2-pyridyl]-4H-1,3-benzothiazine-4-one trifluoroacetic acid salt (330 mg, 0.86 mmol) was dissolved in N,N-dimethylacetamide (10 ml), and benzoyl chloride (264 mg, 1.87 mmol) was added thereto. The reaction mixture was stirred at 60° C. for 14 hrs and combined with ethyl acetate and water. The organic layer was washed with saturated brine and dried over anhydrous magnesium sulfate. The solvent was evaporated, and the residue was subjected to a silica gel column chromatography. The fractions eluted with hexane-ethyl acetate (1:3, v/v) were collected, concentrated and recrystallized from hexane-tetrahydrofuran to give the titled compound (125 mg, 39%) as white crystals.
