[Cl:1][C:2]1[CH:9]=[CH:8][C:5]([C:6]#[N:7])=[C:4](F)[CH:3]=1.[OH:11][C:12]1[CH:19]=[CH:18][C:15]([CH:16]=[O:17])=[C:14]([O:20][CH3:21])[CH:13]=1.C(=O)([O-])[O-].[Cs+].[Cs+].O>CN(C=O)C>[Cl:1][C:2]1[CH:9]=[CH:8][C:5]([C:6]#[N:7])=[C:4]([O:11][C:12]2[CH:19]=[CH:18][C:15]([CH:16]=[O:17])=[C:14]([O:20][CH3:21])[CH:13]=2)[CH:3]=14-Chloro-2-fluorobenzonitrile (0.60 g, 3.9 mmol), 4-hydroxy-2-methoxybenzaldehyde (0.59 g, 3.9 mmol) and cesium carbonate (1.26 g, 3.9 mmol) were heated with stirring in dry DMF (4 ml) at 50° C. for 21 h. The reaction mixture was cooled, poured into water and extracted with ethyl acetate. The ethyl acetate layer was separated, washed with water, 10% aqueous sodium carbonate (2×), water (2×), brine, and dried over magnesium sulphate. After filtration, the solvent was removed in vacuo to yield 4-chloro-2-(4-formyl-3-methoxy-phenoxy)-benzonitrile (0.93 g, 83%) as an orange solid.
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