Ammonium Chloride → Methyl 4-(5-cyano-4-oxo-6-(4-phenoxyphenyl)-1,4-dihydropyridin-2-yl)benzoate

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A mixture of 3-amino-3-(4-phenoxyphenyl)acrylonitrile (0.517 g, 2.188 mmol) and methyl 4-(3-methoxy-3-oxopropanoyl)benzoate (2.068 g, 8.75 mmol) was microwaved at 230° C. for 20 min. After cooling to room temperature, the mixture was poured into saturated ammonium chloride (25 mL) and extracted with ethyl acetate (80 mL). The ethyl acetate phase was washed with saturated ammonium chloride (10 mL), water (10 mL), brine (5 mL), dried (MgSO4) and concentrated. Silica gel chromatography, eluting with 0-80% ethyl acetate in hexanes, gave impure products. The material was triturated with dichloromethane. The white solid was collected by filtration to give methyl 4-(5-cyano-4-oxo-6-(4-phenoxyphenyl)-1,4-dihydropyridin-2-yl)benzoate (0.598 g, 65% yield). 1H NMR (400 MHz, CDCl3) δ ppm 9.25 (1H, br. s), 8.17 (2H, br. s), 8.02 (1H, br. s), 7.71 (2H, br. s), 7.40 (2H, t, J=7.91 Hz), 7.24 (1H, br. s), 7.03-7.16 (4H, m), 6.62 (1H, br. s), 3.95 (3H, s); MS (ES+) m/z: 423 (M−H); LC retention time: 4.118 min (analytical HPLC Method A).

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