I[CH2:2][CH3:3].C([O-])([O-])=O.[K+].[K+].[OH:10][C:11]1[CH:12]=[C:13]([CH:16]=[CH:17][C:18]=1[N+:19]([O-:21])=[O:20])[CH:14]=[O:15].O>CN(C=O)C>[CH2:2]([O:10][C:11]1[CH:12]=[C:13]([CH:16]=[CH:17][C:18]=1[N+:19]([O-:21])=[O:20])[CH:14]=[O:15])[CH3:3]At 20° C. iodoethane (3.78 g) was added to a suspension of K2CO3 (1.09 g) and 3-hydroxy-4-nitro-benzaldehyde (1.0 g) in DMF (5 ml). The reaction mixture was stirred at 70° C. for 18 h, poured into water and then extracted with ethyl acetate. The organic phases were combined, dried (MgSO4) and concentrated in vacuo. The title product was obtained as a yellow solid. Yield: 1.17 g. MS-ESI: [M+H]+=196.
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