[Br:1][C:2]1[NH:3][C:4]([C:11]([O:13][CH3:14])=[O:12])=[C:5]([C:7]([O:9][CH3:10])=[O:8])[N:6]=1.Br[CH2:16][CH:17]=[C:18]([CH3:20])[CH3:19].C(=O)([O-])[O-].[K+].[K+].O>CN(C)C=O>[Br:1][C:2]1[N:6]([CH2:16][CH:17]=[C:18]([CH3:20])[CH3:19])[C:5]([C:7]([O:9][CH3:10])=[O:8])=[C:4]([C:11]([O:13][CH3:14])=[O:12])[N:3]=1A mixture of 12.20 g (46 mmol) dimethyl 2-bromo-imidazole-4,5-dicarboxylate, 7.16 g (48 mmol) 1-bromo-3-methyl-2-butene and 7.19 g (52 mmol) potassium carbonate in 150 ml of dimethylformamide were stirred for two hours at 50° C. Then 100 ml of water were added, and the mixture was extracted three times with ethyl acetate. The extracts were dried and evaporated down. The crude product thus obtained was purified by column chromatography (silica gel; eluant: cyclohexane/ethyl acetate 4:1->2:1).
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