Dimethylformamide → Ethyl 2-(4-cyano-3-methoxyphenyl)acetate

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

Ethyl (3-methoxy-4-{[(trifluoromethyl)sulfonyl]oxy}phenyl)acetate (16.6 g) was dissolved in anhydrous dimethylformamide (100 mL). Zinc cyanide (3.4 g, 29 mmol) was added, and the solution was purged thoroughly with nitrogen. Tetrakis(triphenylphosphine)palladium (0) (5.6 g, 4.9 mmol) was then added and the reaction mixture was heated to 80° C. for 4 h. After allowing the reaction mixture to cool to ambient temperature and diluting with water (200 mL), ethyl acetate (400 mL) was added and the mixture was filtered to remove any solids. The filtrate was transferred to a separatory funnel, and the layers separated. The aqueous layer was re-extracted with ethyl acetate (2×100 mL). The organic layers were combined and dried over magnesium sulfate. The dry organics were then filtered and evaporated to dryness under reduced pressure and excess dimethylformamide was removed by evaporation in vacuo at 65° C. for 1.5 h to yield crude product. The crude product was purified through silica gel chromatography (ethyl acetate/hexanes, 2:3) to yield ethyl (4-cyano-3-methoxyphenyl)acetate. 1H NMR (500 MHz, DMSO-d6), δ 7.67 (d, J=8.0 Hz, 1H), 7.18 (s, 1H), 7.0 (d, J=8.0 Hz, 1H), 4.10 (q, J=7.1 Hz, 2H), 3.89 (s, 3H), 3.78 (s, 2H), 1.19 (t, J=7.1 Hz, 3H); LC/MS (M+1)+=220.17; tR=1.36 min.

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