[CH2:1]([N:5]1[C:13]2[N:12]=[CH:11][N:10]([CH2:14][CH:15]=[CH2:16])[C:9]=2[C:8](=[O:17])[NH:7][C:6]1=[O:18])[CH2:2][CH2:3][CH3:4].[C:19]([O-])([O-])=O.[Na+].[Na+].CI.C([O-])([O-])=O.[K+].[K+]>CN(C=O)C>[CH2:1]([N:5]1[C:13]2[N:12]=[CH:11][N:10]([CH2:14][CH:15]=[CH2:16])[C:9]=2[C:8](=[O:17])[N:7]([CH3:19])[C:6]1=[O:18])[CH2:2][CH2:3][CH3:4]A stirred solution of 3-butyl-7-(2-propen-1-yl)-3,7-dihydro-1H-purine-2,6-dione (1.0 g, 4.03 mmol) in anhydrous DMF (10 ml) was treated with Na2CO3 (470 mg, 4.43 mmol) followed by Methyliodide (275 ul, 4.43 mmol). The mixture was heated at 35° C. for 17 hours. K2CO3 (500 mg, 3.6 mmol) and Methyliodide (275 ul, 4.43 mmol) were added and then stirred at 50° C. for a further 18 hours. The reaction mixture was allowed to cool then partitioned between 2M HCl (aq) and EtOAc. The organic layer was separated and the aqueous extracted once more with EtOAc. The combined extracts were washed with brine, dried (MgSO4) and concentrated giving a yellow/brown oil (1.24 g). The product was purified by silica SPE (10 g), eluting with EtOAc/cyclohexane mixtures. The product fractions were combined and concentrated to afford the title compound as a pale yellow solid (1.11 g, quant.); m/z 263.3[MH+].
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