[CH3:1][C:2]([CH3:15])=[CH:3][CH2:4][NH:5][C:6]1[N:14]=[CH:13][N:12]=[C:11]2[C:7]=1[NH:8][CH:9]=[N:10]2.[Br:16][CH2:17][CH2:18]Br.C([O-])([O-])=O.[K+].[K+].C(OCC)(=O)C>CS(C)=O>[CH3:1][C:2]([CH3:15])=[CH:3][CH2:4][NH:5][C:6]1[N:14]=[CH:13][N:12]=[C:11]2[C:7]=1[N:8]=[CH:9][N:10]2[CH2:18][CH2:17][Br:16]Mixture of 6-[(3-methylbut-2-en-1-yl)amino]purine (2 g, 9.8 mmol), 1,2-dibromoethane (12.94 g, 6 ml, 69 mmol) and K2CO3 (2.5 g, 24 mmol) was stirred in 50 ml DMSO for 12 h. Reaction mixture was poured onto drift ice and after ice dissolution 30 ml ethyl acetate was added. Ethyl acetate layer was purified by charcoal and SiO2 and then it was evaporated in vacuo. The pure product was recrystallised from methanol; yellow solid was obtained. Yield: 70%. 1H NMR (DMSO-d6): 1.75 (3H, s), 1.59 (3H, s), 4.12 (2H, t, J=5.76), 4.10 (2H, s (br)), 4.6 (2H, t, J=5.76), 5.3 (1H, t, J=6.57), 8.1 (1H, s (br)), 8.3 (1H, s).
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