C[O-].[Na+].[CH3:4][O:5][C:6]1[CH:15]=[C:14]([CH:16]=O)[C:9]2[CH:10]=[CH:11][CH2:12][O:13][C:8]=2[C:7]=1[O:18][CH3:19].[CH2:20]([O:22][CH2:23][CH2:24][C:25]#[N:26])C>CO.O.C(OCC)C>[CH3:4][O:5][C:6]1[CH:15]=[C:14]([CH:16]=[C:24]([CH2:23][O:22][CH3:20])[C:25]#[N:26])[C:9]2[CH:10]=[CH:11][CH2:12][O:13][C:8]=2[C:7]=1[O:18][CH3:19]A mixture of sodium methoxide (7.02 g, 0.13 mole), 7,8-dimethoxy-5-formyl-2H-1-benzopyran (57 g, 0.26 mole) and 3-ethoxypropanenitrile (28.35 g, 0.286 mole) in methanol (150 mL) was heated at reflux for 4 hr, allowed to cool and diluted with water (150 mL) and ethylether (500 mL). The layers were separated and the ether portion was washed with water (3×250 mL and 1×100 mL) and dried over magnesium sulfate. The ether solution was concentrated to give 55 g (73%) of an amber oil which was used without further purification.
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