Water → tert-butyl 2-(2-oxo-6-(4-(trifluoromethyl)phenyl)-3,4-dihydroquinolin-1(2H)-yl)acetate

Participants

Reaction Steps

To a solution of 6-(4-(trifluoromethyl)phenyl)-3,4-dihydroquinolin-2(1H)-one (291 mg, 1.0 mmol) in anhydrous N,N-dimethylformamide (2.5 ml) was added potassium carbonate (276 mg, 2.0 mmol), and the mixture stirred at room temperature for 5 minutes in a 5 ml Personal Chemistry microwave reaction vial. To the above mixture was added tert-butyl 2-bromoacetate (390 mg, 2.0 mmol), the vial was sealed, and subjected to microwave irradiation at 120° C. for 5 min, and then at 140° C. for 40 min until most of the 6-(4-(trifluoromethyl)phenyl)-3,4-dihydroquinolin-2(1H)-one was converted. The reaction mixture was cooled, poured into water (40 mL), extracted with ethyl acetate (2×40 mL), the combined organic phase was washed with water (40 mL), 2N sodium carbonate (10 mL), brine (40 mL), dried over sodium sulfate, and the solvent was removed under reduced pressure. The crude product was dissolved in a mixture of N,N-dimethylformamide-methanol (1 and 2 mL respectively), subjected to reverse phase HPLC with a gradient of acetonitrile/water (2% to 98%) to afford tert-butyl 2-(2-oxo-6-(4-(trifluoromethyl)phenyl)-3,4-dihydroquinolin-1(2H)-yl)acetate (247 mg, 0.61 mmol, 61%). LCMS mz 350.0 (M−56+H), 428.0 (M+Na), anal HPLC>98% in purity, 1H NMR (400 MHz; CDCl3) δ 7.67 (m, 4H); 7.40-7.50 (m, 2H); 6.86 (d, J=8.6 Hz, 1H); 4.63 (s, 2H); 3.04 (t, J=7.4 Hz, 2H); 2.76 (t, J=7.4 Hz, 2H), 1.48 (s, 9H).

Provenance & Evidence