Methanol → 7-(4-methoxybenzyl)-5-methyl-2H-pyrazolo[3,4-d]pyrimidine-4,6(5H,7H)-dione

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To a solution of 6-hydrazinyl-1-(4-methoxybenzyl)-3-methylpyrimidine-2,4(1H,3H)-dione (0.45 g, 1.6 mmol) in DMF (2 mL), POCl3 (0.3 mL, 3.3 mmol) is added dropwise at 0° C. After the reaction mixture is stirred at 0° C. for 1 hour, the mixture is treated with methanol carefully to give white solid. The solid is further purified by chromatography to give 0.4 g product (Yield: 85%). 1H NMR (DMSO-d6) δ 3.23 (s, 3H), 3.71 (s, 3H), 5.05 (s, 2H), 6.85 and 7.31 (AB, 4H, J=11.6 Hz), 8.47 (s, 1H), 13.5 (br, 1H). MS (FAB) m/z 287.21 [M+H]+.

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