[CH3:1][N:2]1[C:10]2[N:9]=[CH:8][NH:7][C:6]=2[C:5](=[O:11])[NH:4][C:3]1=[O:12].[H-].[Na+].[H][H].Br[CH2:18][CH2:19][CH:20]([CH3:22])[CH3:21]>CN(C=O)C.O>[CH3:21][CH:20]([CH3:22])[CH2:19][CH2:18][N:7]1[C:6]2[C:5](=[O:11])[NH:4][C:3](=[O:12])[N:2]([CH3:1])[C:10]=2[N:9]=[CH:8]1100 g (0.602 mol) of 3-methylxanthine, dissolved in 1200 ml of DMF, were slowly treated with 16 g (0.66 mol) of sodium hydride. The solution was heated to 60° C. and, when the evolution of hydrogen was at an end, treated with 109 g (0.66 mol) of 1-bromo-3-methylbutane. The reaction mixture was stirred at 100° C. for 12 hours and introduced into 2000 ml of water. The precipitate was filtered off with suction, washed with water and dried to constant weight.
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