COC1C=CC(C[N:8]2[C:13]3[NH:14][N:15]=[C:16]([NH:17][C:18]4[CH:23]=[CH:22][CH:21]=[CH:20][CH:19]=4)[C:12]=3[C:11](=[O:24])[N:10]([CH3:25])[C:9]2=[O:26])=CC=1.C(O)(C(F)(F)F)=O.FC(F)(F)S(O)(=O)=O>C(Cl)Cl>[CH3:25][N:10]1[C:11](=[O:24])[C:12]2[C:16]([NH:17][C:18]3[CH:23]=[CH:22][CH:21]=[CH:20][CH:19]=3)=[N:15][NH:14][C:13]=2[NH:8][C:9]1=[O:26]To a solution of 7-(4-Methoxybenzyl)-5-methyl-3-(phenylamino)-1H-pyrazolo[3,4-d]pyrimidine-4,6(5H,7H)-dione (6.6 g, 17.5 mmol) in CH2Cl2 (200 mL) is added TFA (30 mL) slowly at room temperature, followed by adding trifluoromethanesulfonic acid (10 mL) dropwise. After the reaction-mixture is stirred at r.t. for 2 hours, solvent is removed under reduced pressure, and then 200 mL of 1N NaOH is added with cooling. The mixture is extracted with ethyl acetate five times, dried over Na2SO4, and then filtered. The filtrate is evaporated to dryness to give 4.3 g of crude product as white solids (Yield: 96%). MS (ESI) m/z 258.1 [M+H]+.
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