Water → 8-[1-(Pyridin-3-yl)vinyl]-10-methoxymethyl-10H-pyrazino[2,3-b][1,4]benzothiazine

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To a solution of 303 mg of 1-(10-methoxymethyl-10H-pyrazino[2,3-b][1,4]benzothiazin-8-yl)1-(pyridin-3-yl)ethanol in dichloromethane was added in a nitrogen atmosphere 0.32 ml of methyl chlorosulfonate and the resulting mixture was heated under reflux for 2 hours. Then the reaction mixture was brought back to room temperature and distributed into water and ethyl acetate. The extract was dried over anhydrous magnesium sulfate and filtered. After distilling off the solvent under reduced pressure, the residue was purified by silica gel column chromatography (eluted with dichloromethane/methanol) to thereby give 230 mg of the title compound as a yellow solid.

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