[N+:1]([CH3:4])([O-:3])=[O:2].C(=O)([O-])[O-].[Cs+].[Cs+].[Br:11][C:12]1[N:16]([CH2:17][CH:18]=[C:19]([CH3:21])[CH3:20])[C:15]([C:22]([O:24][CH3:25])=[O:23])=[C:14]([CH:26]=[O:27])[N:13]=1.C(O)(=O)C>CO.C(Cl)Cl>[Br:11][C:12]1[N:16]([CH2:17][CH:18]=[C:19]([CH3:21])[CH3:20])[C:15]([C:22]([O:24][CH3:25])=[O:23])=[C:14]([CH:26]([OH:27])[CH2:4][N+:1]([O-:3])=[O:2])[N:13]=135 ml nitromethane are added to 1.14 g caesium carbonate in 15 ml of methanol at ambient temperature. Then the mixture is combined with a solution of 3.50 g methyl 2-bromo-3-(3-methyl-2-buten-1-yl)-5-formyl-3H-imidazole-4-carboxylate in 20 ml of methanol and 5 ml methylene chloride and stirred for 15 minutes at ambient temperature. Then 0.5 ml acetic acid are added and the solution is evaporated down in vacuo. The flask residue is combined with aqueous sodium hydrogen carbonate solution and extracted with ethyl acetate. The combined organic phases are dried over magnesium sulphate and evaporated down.
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