[C:1]([O:9][CH2:10][CH3:11])(=[O:8])[CH2:2][C:3]([O:5][CH2:6][CH3:7])=[O:4].[CH3:12][O:13][C:14]1[CH:21]=[CH:20][CH:19]=[C:18]([O:22][CH3:23])[C:15]=1[CH:16]=O.N1CCCCC1.C(O)(=O)C>O.C1(C)C=CC=CC=1>[CH3:23][O:22][C:18]1[CH:19]=[CH:20][CH:21]=[C:14]([O:13][CH3:12])[C:15]=1[CH:16]=[C:2]([C:3]([O:5][CH2:6][CH3:7])=[O:4])[C:1]([O:9][CH2:10][CH3:11])=[O:8]A mixture of 1.52 ml of diethyl malonate, 1.66 g of 2,6-dimethoxybenzaldehyde, 0.1 ml of piperidine, 0.11 ml of glacial acetic acid and 100 ml of toluene was boiled at 110° C. on a water separator for 3.5 hours. The solution was extracted with 10% NaHCO3 solution and back-washed with saturated NaCl solution. The organic phase was dried, filtered under suction and evaporated under reduced pressure. There were obtained 2.8 g of diethyl (2,6-dimethoxybenzylidene)malonate, as a dark yellow oil.
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