Ethyl Bromide → HCID 58934952, compound

Participants

Reaction Steps

To a solution of 0.3 g (1.04 mmol) of 6-ethyl-7-hydroxy-2-(trifluoromethyl)-2H-chromene-3-carboxylic acid in 5 mL of anhydrous dimethylformamide was added 255 mg (0.78 mmol) of cesium carbonate in one portion, followed by addition of 103 uL (1.7 mmol) of ethyl bromide. The reaction was stirred at room temperature overnight. The reaction was added to 100 mL of ethyl acetate. The organic phase was washed with brine three times, and dried over anhydrous magnesium sulfate. After removing the volatiles, the residue was purified by silica chromatography with EtOAc/hexane (3:7) to afford 0.21 g (67%) of a light yellow solid: 1H NMR (CDCl3/400 MHz) 7.68(s, 1H), 7.00(s, 1H), 6.42(s, 1H), 5.63 (q, J=7.2 Hz, 1H), 5.38(s, 1H), 4.28(m, 2H), 2.54(q, J=7.2 Hz, 2H), 1.31(t, J=7.2 Hz, 3H), 1.20(t, J=7.6 Hz, 3H), MS (ESI+) 317 (M+1, 100).

Provenance & Evidence