Benzenepropanoic acid, 4-nitro-beta-oxo-, ethyl ester → 6-(4-Nitrophenyl)-4-oxo-2-(4-phenoxyphenyl)-1,4-dihydropyridine-3-carbonitrile

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A mixture of 3-amino-3-(4-phenoxyphenyl)acrylonitrile (101 mg, 0.427 mmol) and ethyl 3-(4-nitrophenyl)-3-oxopropanoate (312.8 mg, 1.319 mmol) in N,N-dimethylacetamide (1 mL) was microwaved at 230° C. for 20 min, cooled to room temperature, and concentrated. Silica gel chromatography, eluting with 0-5% methanol in dichloromethane, gave 6-(4-nitrophenyl)-4-oxo-2-(4-phenoxyphenyl)-1,4-dihydropyridine-3-carbonitrile as brown solid (211 mg, 100% yield). 1H NMR (400 MHz, CDCl3) δ ppm 8.31 (2H, δ, J=8.78 Hz), 8.19 (2H, br. s), 7.96 (2H, br. s), 7.39 (2H, t, J=7.91 Hz), 7.18 (1H, t, J=7.40 Hz), 7.06-7.13 (3H, m); MS (ES+) m/z: 410 (M+H); LC retention time: 4.275 min (analytical HPLC Method A).

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