[CH3:1][C:2]1[CH:7]=[C:6]([O:8][CH3:9])[CH:5]=[C:4]([CH3:10])[C:3]=1[O:11][CH3:12].CN(C)CCN(C)C.C([Li])CCC.[CH:26](=[O:33])[C:27]1[CH:32]=[CH:31][CH:30]=[N:29][CH:28]=1>CCOCC.CCCCCC.O>[N:29]1[CH:30]=[CH:31][CH:32]=[C:27]([CH:26]([OH:33])[C:5]2[C:4]([CH3:10])=[C:3]([O:11][CH3:12])[C:2]([CH3:1])=[CH:7][C:6]=2[O:8][CH3:9])[CH:28]=13.0 g of 1,3-dimethyl-2,5-dimethoxybenzene and 3.1 g of tetramethylethylenediamine were dissolved in 30 ml of dry ether and 17 ml of a 1.6M solution of n-butyllithium in hexane was added dropwise thereto in a nitrogen atmosphere at room temperature. After 1 hour, the mixture was cooled to -65° C. and a solution of 2.9 g of nicotinaldehyde in 10 ml of ether was added thereto. After 30 minutes, the reaction was ceased by adding water and the reaction mixture was extracted with ethyl acetate. The organic layer was dried over magnesium sulfate. After distilling off the solvent, 6.4 g of a crude product of the title compound was obtained.
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