Sodium Chloride → 2-Phenyl-2-methyl-5-[2-(3-pyridinyl)ethenyl]-3(2H)-furanone

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To a solution of 3-pyridinecarboxaldehyde (1.03 g, 9.6 mM) and 2,5-dimethyl-2-phenyl-3(2H)-furanone (1.0 g, 8 mM) in ethanol (50 mL), was added 1N aqueous sodium hydroxide (2.4 mL, 2.4 mM). The reaction solution was heated at 60° C. for 8 hours. After the reaction solution cooled to room temperature, saturated aqueous sodium chloride (200 mL) was added. The aqueous layer was extracted with diethyl ether (3×100 mL). The combined ethereal extracts were washed with saturated aqueous sodium chloride (50 mL), dried over MgSO4, filtered and concentrated to give a brown solid. The crude product was purified by chromatography (silica gel, pet. ether-ethyl acetate) to afford a yellow crystalline solid (0.8 g, 36.3% yield), m.p. 106°-108° C.

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