[OH:1][C:2]1[N:7]=[C:6]([SH:8])[N:5]=[C:4]2[NH:9][N:10]=[CH:11][C:3]=12.[CH3:12]I>[OH-].[Na+].O>[OH:1][C:2]1[N:7]=[C:6]([S:8][CH3:12])[N:5]=[C:4]2[NH:9][N:10]=[CH:11][C:3]=124-hydroxy-6-mercapto-pyrazolo[3,4-d]pyrimidine (14 g) was dissolved in a solution of sodium hydroxide (10 g) in water (300 mL). The solution was cooled to 5° C. and shaken with of methyl iodide (12 g). After 15-20 minutes the solution was charcoaled, filtered and acidified with acetic acid to yield crude product. Re-crystallization in acid gave the desired product MS (ES+): 183.0 (M+1)+.
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