反应详情

温度

100 °C

To a thick-walled vessel was charged with 2-bromo-3-nitrophenol (1.16 g, 5.32 mmol), ethyl acrylate (666 mg, 0.72 mmol), tri-(o-tolyl)phosphine (65 mg, 0.21 mmol), palladium acetate (12 mg, 0.05 mmol), and triethylamine(10 mL). The vessel was then sealed and the resulting mixture was heated to 100° C. overnight. In the morning, the vessel was cooled to rt and the mixture was poured into water. The mixture was acidified with hydrochloric acid and extracted with ethyl acetate (2×50 mL). The combined organic layer was washed with water, brine and dried over anhydrous sodium sulfate. The residue was purified with silica gel flash chromatography by using hexane/ethyl acetate (2/1) as the eluant to give ethyl (2E)-3-(2-hydroxy-6-nitrophenyl)prop-2-enoate (883 mg, 70%): Rf0.16 (3/1 hexane/ethyl acetate); 1H NMR (CDCl3) δ 7.6(d, J=16.1 Hz, 1H), 7.05-7.23 (m, 3H), 6.71 (dd, J=16.1, 0.8 Hz, 1H), 4.18 (q, J=7.1 Hz, 2H), 1.26 (t, J=7.1 Hz, 2H).

1. customThe vessel was then sealed
2. temperatureIn the morning, the vessel was cooled to rt
3. extractionextracted with ethyl acetate (2×50 mL)
4. washThe combined organic layer was washed with water, brine
5. dry with materialdried over anhydrous sodium sulfate
6. customThe residue was purified with silica gel flash chromatography