Dimethyl malonate → HCID 75967836, compound

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Reaction Steps

A solution of 3-sec-butyl-5-(3-(4-chlorophenyl)-3-oxoprop-1-enyl)-2-hydroxybenzaldehyde of formula III (0.5 g, 1.46 mmol), dimethyl malonate (0.19 g, 1.46 mmol) in methanol (30 mL) was treated with N-methyl morpholine (0.3 mL) and refluxed. Most of the excess solvent was evaporated under reduced pressure, and the residue was neutralized with acetic acid. To this residue water (25 mL) was added and extracted 3-fold with 25 mL of CHCl3. The combined organic layers were dried on Na2SO4, filtered, and concentrated to dryness under reduced pressure. The residue was chromatographed over silica gel (SiO2, 230-400 flash), eluting with a gradient of 20% ethyl acetate in hexane to 40% ethyl acetate in hexane. Concentration provides methyl 8-sec-butyl-6-(3-(4-chlorophenyl)-3-oxoprop-1-enyl)-2-oxo-2H-chromene-3-carboxylate (General Formula IV). (0.49 g, 80% yield). White solid, m. p. 145-146° C.; 1H NMR (CDCl3, 300 MHz); δ 8.59 (s, 1H), 7.99 (d, 2H, J=8.5 Hz), 7.84-7.75 (m, 3H), 7.58-7.47 (m, 3H), 4.0 (s, 3H), 3.45-3.36 (m, 1H), 1.78-1.69 (m, 2H), 1.32 (d, 3H, J=7.0 Hz), 0.89 (t, 3H, J=7.3 Hz): 13C NMR (CDCl3, 75 MHz); δ 188.6, 163.4, 156.1, 154.0, 149.1, 143.1, 139.5, 136.7, 136.2, 131.6, 131.4, 130.0, 129.0, 127.3, 122.3, 118.4, 118.2, 52.9, 33.5, 29.6, 20.4. 12.0; ESI-MS (m/z): 425 (M+H)+.

Provenance & Evidence