Acetic acid, 2-(triphenylphosphoranylidene)-, ethyl ester → (E)-Ethyl 3-(2-cyanophenyl)acrylate

関与物質

反応条件

反応手順

2-Formylbenzonitrile (5 g, 38.1 mmol) was added to a round bottom flask, equipped with a stir bar, and dissolved in toluene (50 mL). (Carbethoxymethylene)triphenylphosphorane (14.6 g, 41.9 mmol) was then added to the mixture. The reaction was heated at 110° C. for 20 hours. The solution was concentrated under vacuum, and the residue was redissolved in dichloromethane. The solution was passed though a plug of silica (dichloromethane eluent) to provide the title compound. 1H NMR (300 MHz, CDCl3) δ ppm 1.37 (t, 3H, J=7.12 Hz), 4.30 (q, 2H, J=7.12 Hz), 6.61 (d, 1H, J=15.94 Hz), 7.47 (dt, 1H, J=7.71 Hz, J=1.19 Hz), 7.62 (dt, 1H, J=7.80 Hz, J=1.36 Hz), 7.7-7.75 (m, 2H), 7.97 (d, 1H, J=15.94 Hz); MS (DCI+) m/z 218.9 [M+NH3]+.

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