Tetrahydrofuran → 6-Oxo-1-phenyl-1,6-dihydropyridine-3-carboxylic acid

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Reaction Steps

Lithium hydroxide monohydrate (0.366 g, 8.73 mmol) was added to a mixture of methyl-6-oxo-1-phenyl-1,6-dihydropyridine-3-carboxylate (1.0 g, 4.37 mmol), tetrahydrofuran (9 mL) and water (6 mL) at 0° C. The mixture was stirred for 1 hour, diluted with water and washed with ethyl acetate. The pH of the aqueous layer was adjusted to 2 using 2 N hydrochloric acid and the precipitate was filtered to give the title compound as a brown solid (0.740 g, 79%). m.p. 256-263° C.; 1H NMR (400 MHz, DMSO-d6) δ 6.53 (d, J=9.4 Hz, 1H), 7.40-7.49 (m, 5H), 7.87 (dd, J=2.5, 9.8 Hz, 1H), 8.23 (d, J=2.5 Hz, 1H); IR (KBr) u 3446, 1708, 1645, 1577, 1263, 1228 cm−1; MS 214 (M−1).

Provenance & Evidence