反应详情

Ethyl chloroformate (4.4 mL, 0.046 mol) was added to a mixture of 2-(trifluoromethoxy)aniline (8.25 g, 0.0466 mol), sodium carbonate (15 g, 0.14 mol), 1,4-dioxane (70 mL) and water (70 mL) at 0° C. and the the reaction mixture stirred at room temperature overnight. The reaction mixture was then washed with ether, acidified (pH 3) and the product extracted into EtOAc (3×40 mL). The combined extracts were washed with water (40 mL) and brine (40 mL), dried over Na2SO4 and the solvent removed in vacuo to give the desired product in a 84% yield. 1H NMR (400 MHz, CDCl3): δ 1.33 (t, J=5.2 Hz, 3H), 4.25 (q, J=6.8 Hz, 2H), 6.91 (br, 1H), 7.04 (m, 1H), 7.23 (m, 1H), 7.28 (m, 1H) and 8.2 (m, 1H). MS (ES+): m/z 250.12 [MH+].

1. washThe reaction mixture was then washed with ether
2. extractionthe product extracted into EtOAc (3×40 mL)
3. washThe combined extracts were washed with water (40 mL) and brine (40 mL)
4. dry with materialdried over Na2SO4
5. customthe solvent removed in vacuo