反应详情

The mixture of 3-hydroxy-4-methoxy-benzoic acid ethyl ester (1.75 g, 8.92 mmol), methanesulfonic acid 3,3,3-trifluoro-propyl ester (2.06 g, 10.7 mmol) and anhydrous K2CO3 (2.49 g, 17.8 mmol) in acetone (20 mL) is heated with stirring at reflux temperature overnight. After cooling, the mixture is diluted with AcOEt followed by washing of the organic phase with 2N aqueous NaOH and brine. The organic layer is dried over Na2SO4 and evaporated, and the crude product is purified by silica gel chromatography (eluent: hexane/AcOEt 5:1) to give the title compound as oil. TLC, Rf (hexane/AcOEt 1:1)=0.59. MS: 293.0 [M+H]+. 1H-NMR (CDCl3): δ 1.42 (t, 3H), 2.74 (m, 2H), 3.96 (s, 3H), 4.33 (m, 2H), 4.40 (m, 2H), 6.94 (m, 1H), 7.59 (s, 1H), 7.77 (m, 1H) ppm.

1. temperatureis heated
2. temperatureat reflux temperature overnight
3. temperatureAfter cooling
4. washby washing of the organic phase with 2N aqueous NaOH and brine
5. dry with materialThe organic layer is dried over Na2SO4
6. customevaporated
7. customthe crude product is purified by silica gel chromatography (eluent: hexane/AcOEt 5:1)