Diethyl Ether → Isopropyl 3-[2-chloro-4-fluoro-5-(tetrahydro-1,3,7-trioxo-1H-imidazo [5,1-c][1,4]thiazin-2(3H)-yl) phenyl]tetrahydro-5-methyl-2,4,6-trioxo-s-triazine-1(2H)-acetate

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A mixture of isopropyl 3-{2-chloro-4-fluoro-5-[5,6,8,8a-tetrahydro-1,3-dioxo-1H-imidazo[5,1-c][1,4]-thiazin-2(3H)-yl]phenyl}tetrahydro-5-methyl-2,4,6-trioxo-s-triazine-1(2H)-acetate (0.95 g, 1.75 mmol) in methanol (10 mL) is added over 15 minutes to a solution of sodium periodate (0.38 g, 1.78 mmol) in water (10 mL) which is previously cooled to 0°-5° C. After the addition is complete, the reaction mixture is stirred at room temperature overnight, diluted with methylene chloride, washed sequentially with a one molar KH2PO4 solution and brine, dried over anhydrous magnesium sulfate, and concentrated in vacuo to obtain a yellow foam. Flash column chromatography of the foam using silica gel, a 10% ether in methylene chloride solution and a 2.5% methanol in methylene chloride solution gives the title product as a white foam (0.59 g, mp 175°-180° C.).

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