[Cl:1][C:2]1[N:3]=[C:4]([C:9]2[CH:14]=[CH:13][CH:12]=[CH:11][CH:10]=2)[NH:5][C:6]=1[CH:7]=[O:8].CS(O[CH2:20][CH2:21][CH2:22][CH2:23][O:24][CH3:25])(=O)=O.C(=O)([O-])[O-].[Cs+].[Cs+]>CN(C)C(=O)C.O>[Cl:1][C:2]1[N:3]=[C:4]([C:9]2[CH:10]=[CH:11][CH:12]=[CH:13][CH:14]=2)[N:5]([CH2:20][CH2:21][CH2:22][CH2:23][O:24][CH3:25])[C:6]=1[CH:7]=[O:8]
To a solution of 4-chloro-2-phenyl-1H-imidazole-5-carbaldehyde (500 mg) and 4-methoxybutyl methanesulfonate (660 mg) in N,N-dimethylacetamide (10 ml) was added cesium carbonate (2.4 g), and the mixture was stirred at 90° C. for 7 hr. After cooling to room temperature, the reaction mixture was diluted with water and extracted with ethyl acetate. The extract was washed with saturated brine, and dried over anhydrous magnesium sulfate. The solvent was evaporated under reduced pressure. The residue was subjected to silica gel column chromatography, and a fraction eluted with ethyl acetate-hexane (5:95-3:7) was concentrated under reduced pressure to give the object product (702 mg).
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