反应详情

2,6-Difluoro-phenol (10.0 g, 92.47 mmol) was dissolved in 15.0 mL of acetone, K2CO3 (7.40 g, 92.47 mmol) and α-bromoacetate (15.44 g, 10.25 mL, 231.18 mmol) were added and the reaction was allowed to reflux overnight. The mixture was filtered through a plug of cotton and the solvent removed in vacuo to give 18.93 g as a colorless oil, 98% yield. 1H NMR (400 MHz, CDCl3): σ 1.26 (t, J=m Hz, 3H), 2.29 (s, 3H), 4.24 (q, J=Hz, 2H), 4.61 (s, 2H), 6.64 (d, J=Hz, 1H), 6.83 (t, J=Hz, 1H), 7.16 (q, J=Hz, 2H) 13C NMR (CDCl3): 169.37, 156.36, 131.13, 127.51, 126.91, 121.63, 111.43, 65.90, 61.41, 16.39, and 14.34. (2,6-Difluoro-phenoxy)-acetic acid ethyl ester (1.66 g) was dissolved in ethanol (10.0 mL), NaOH (2 eqv's) and 5 drops of H2O was added and the reaction stirred at room temperature overnight. The product was filtered and dried to give a white solid, 1.11 g, 64% yield. 1H NMR (400 MHz, d-DMSO): σ 4.84 (s, 2H), 7.31 (m, 1H), 7.46 (m, 1H), 7.93 (m, 1H), 13.19 (s, 1H)

1. temperatureto reflux overnight
2. filtrationThe mixture was filtered through a plug of cotton
3. customthe solvent removed in vacuo
4. customto give 18.93 g as a colorless oil, 98% yield
5. filtrationThe product was filtered
6. customdried
7. customto give a white solid, 1.11 g, 64% yield