4-[5-fluoro-3-(3-oxo-2,3-dihydro-4H-1,4-benzothiazin-7-ylthio)phenyl]-4-methoxytetrahydropyran 、
碘甲烷 以to give 4-[5-fluoro-3-(4-methyl-3-oxo-2,3-dihydro-4H-1,4-benzothiazin-7-ylthio)phenyl]-4-methoxytetrahydropyran in 41% yield, m.p. 131-133° C.的产率得到4-[5-fluoro-3-(4-methyl-3-oxo-2,3-dihydro-4H-1,4-benzothiazin-7-ylthio)phenyl]-4-methoxytetrahydropyran