Methanesulfonyl chloride → 2,2,2-Trifluoro-N-[[6-(4-oxo-4H-1,3-benzothiazin-2-yl)-2-pyridyl]methyl]acetamide

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Reaction Steps

2-[6-(Aminomethyl)-2-pyridyl]-4H-1,3-benzothiazine-4-one trifluoroacetic acid salt (350 mg, 0.91 mmol) was dissolved in pyridine (10 ml), and methanesulfonyl chloride (576 mg, 5.04 mmol) was added thereto. The reaction mixture was stirred at room temperature for 3 hrs. The solvent was evaporated, and the residue was subjected to a silica gel column chromatography. The fractions eluted with hexane-ethyl acetate (1:1, v/v) were collected, concentrated and recrystallized from hexane-tetrahydrofuran to give the titled compound (228 mg, 68%) as pale yellow crystals.

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