[CH2:1]([N:4]1[C:12]2[C:11](=[O:13])[NH:10][C:9](=[O:14])[NH:8][C:7]=2[N:6]=[CH:5]1)[CH:2]=[CH2:3].C([O-])([O-])=O.[K+].[K+].[CH2:21](I)[CH2:22][CH2:23][CH3:24]>CN(C=O)C>[CH2:21]([N:8]1[C:7]2[N:6]=[CH:5][N:4]([CH2:1][CH:2]=[CH2:3])[C:12]=2[C:11](=[O:13])[NH:10][C:9]1=[O:14])[CH2:22][CH2:23][CH3:24]A stirred solution of 7-(2-propen-1-yl)-3,7-dihydro-1H-purine-2,6-dione (10 g, 52 mmol) in anhydrous DMF (100 ml) was treated with K2CO3 (7.91 g, 57.2 mmol) and, after 10 minutes, BuI (6.51 ml, 57.2 mmol). After reacting for 2 days the reaction mixture was partitioned between 2M HCl (aq) and EtOAc. The organic layer was separated, washed with brine, dried (MgSO4) and concentrated in vacuo to give an off-white solid. This was washed with hot cyclohexane and dried under vacuum to give the title compound (8.87 g, 68%); m/z 249.3[MH+].
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