[C:1]([O:5][C:6]([N:8]1[CH2:13][CH2:12][N:11]([C:14]2[N:22]=[CH:21][N:20]=[C:19]3[C:15]=2[N:16]([CH2:28][C:29]#[C:30][CH3:31])[C:17](=[O:27])[N:18]3CCC#N)[CH2:10][CH2:9]1)=[O:7])([CH3:4])([CH3:3])[CH3:2].[H-].[Na+].O.Cl>C(O)C>[C:1]([O:5][C:6]([N:8]1[CH2:9][CH2:10][N:11]([C:14]2[N:22]=[CH:21][N:20]=[C:19]3[C:15]=2[N:16]([CH2:28][C:29]#[C:30][CH3:31])[C:17](=[O:27])[NH:18]3)[CH2:12][CH2:13]1)=[O:7])([CH3:4])([CH3:3])[CH3:2]4-[7-(2-Butynyl)-9-(2-cyano-ethyl)-8-oxo-8,9-dihydro-7H-purin-6-yl]piperazine-1-carboxylic acid t-butyl ester (1.22 g) was dissolved in ethanol (20 mL). Sodium hydride (60%, in oil) (344 mg) was then added slowly to this solution. After stirring the reaction solution at room temperature for 72 hours, water (50 mL) and 1 N hydrochloric acid (10 mL) were added to the reaction solution, and this was extracted using ethyl acetate. The obtained organic layer was washed with water and saturated brine. The obtained organic layer was then dried over magnesium sulfate, and concentrated under reduced pressure to give the title compound (1.25 g).
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