HCID 53999905, compound → HCID 20238644, compound

Participants

Reaction Steps

Ethyl 4,4-diethoxy-2-(3-nitrophenylmethylene)-3-oxobutanoate (21.75 g, 62 mmoles) and ethyl 3-amino-4-fluoro-2-butenoate (9.17 g, 68 mmoles) were heated at 125° for 1.5 hours. The reaction mixture was dissolved in ethyl acetate (150 ml), washed with water and saturated brine, dried (MgSO4) and the solvent was removed in vacuo. The residue was dissolved in tetrahydrofuran (195 ml) and 50% aqueous hydrochloric acid (292 ml) was added slowly. After 30 minutes the reaction mixture was extracted with ethyl acetate and the organic extract washed with saturated aqueous sodium bicarbonate, water, dried (MgSO4) and the solvent was removed in vacuo. The residue was chromatographed on silica eluting with ethyl acetate/petroleum ether (60°-80°) mixtures. Crystallisation from 2-propanol gave the title compound (4.6 g), mp 88°-90°.

Provenance & Evidence