ethyl 2-[6-hydroxy-1-oxo-2-(2,2,2-trifluoroethyl)-3,4-dihydronaphthalen-2-yl]acetate

反応条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

実験手順: Methane sulfonic acid (12 mL) was added to a solution of 1E (8 g, 26.5 mmol) in ethanol (50 mL), and the mixture was stirred at room temperature for 12 h. Ethanol was removed from reaction mixture under reduced pressure, and the residue was diluted with ethyl acetate and washed with brine solution. The organic layer was dried over sodium sulfate and filtered, and the filtrate was concentrated under reduced pressure. The crude product was purified by flash chromatography using 20% ethyl acetate in hexanes to give the title compound (6 g, 56%) as a syrup. 1H NMR (400 MHz, CDCl3): δ 7.97 (d, J=9.2 Hz, 1H), 6.75 (dd, J1=2.4 Hz, J2=8.8 Hz, 1H), 6.64 (d, J=2.4 Hz, 1H), 4.1 (q, J=6.8 Hz, 2H), 3.0-2.8 (m, 4H), 2.62-2.5 (m, 2H), 2.4 (m, 1H), 2.3 (m, 1H), 1.23 (t, J=7.2 Hz, 3H). ESI-MS m/z: 331 (M+H)+. Ethanol was removed from reaction mixture under reduced pressure the residue was diluted with ethyl acetate washed with brine solution The organic layer was dried over sodium sulfate filtered the filtrate was concentrated under reduced pressure The crude product was purified by flash chromatography