[Si]([O:8][CH2:9][C:10]1[CH:11]=[C:12]([NH:16][C:17]2[N:25]=[C:24]3[C:20]([NH:21][C:22](=[O:34])[N:23]3[C:26]3[CH:31]=[CH:30][CH:29]=[CH:28][C:27]=3[O:32][CH3:33])=[C:19]([C:35]([NH2:37])=[O:36])[N:18]=2)[CH:13]=[CH:14][CH:15]=1)(C(C)(C)C)(C)C.[Si](OCC1C=C(NC2N=C3C(NC(=O)N3C3C=CC=CC=3OC)=C(C(OCC)=O)N=2)C=CC=1)(C(C)(C)C)(C)C>CO.N>[OH:8][CH2:9][C:10]1[CH:11]=[C:12]([NH:16][C:17]2[N:25]=[C:24]3[C:20]([NH:21][C:22](=[O:34])[N:23]3[C:26]3[CH:31]=[CH:30][CH:29]=[CH:28][C:27]=3[O:32][CH3:33])=[C:19]([C:35]([NH2:37])=[O:36])[N:18]=2)[CH:13]=[CH:14][CH:15]=12-(3-((tert-Butyldimethylsilyloxy)methyl)phenylamino)-9-(2-methoxyphenyl)-8-oxo-8,9-dihydro-7H-purine-6-carboxamide. Ethyl 2-(3-((tert-butyldimethylsilyloxy)methyl)phenyl-amino)-9-(2-methoxyphenyl)-8-oxo-8,9-dihydro-7H-purine-6-carboxylate. (0.180 g, 3.97 mmol) was dissolved in methanol (10 mL), saturated with ammonia gas, and reacted according to General Procedure G. After 16 h, the solution was condensed under reduced pressure to afford the title compound (0.153 g, 91%). MS (ESI) m/z 521.6. [M+1]+.
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