反应详情

5-Methyl-6-(4-pyridinyl)-2H-1,4thiazin-3(4H)-one (1 g) in methanol (100 ml) and 36N sulfuric acid (0.4 ml) were treated in the same manner as described in Example 1-(4) to give 0.95 g of 5-methyl-6-(4-pyridinyl)-2H-1,4-thiazin-3(4H)-one sulfate as yellow needles.