Trifluoroacetic acid → (S)-methyl 2-methyl-6-(1-(piperidin-4-yl)-1H-pyrazol-4-yl)-5-propoxy-3,4-dihydroquinoline-1(2H)-carboxylate

Participants

Reaction Steps

Trifluoroacetic acid (0.5 mL, 6.49 mmol) was added to a solution of (S)-methyl 6-(1-(1-(tert-butoxycarbonyl)piperidin-4-yl)-1H-pyrazol-4-yl)-2-methyl-5-propoxy-3,4-dihydroquinoline-1(2H)-carboxylate (0.090 g, 0.176 mmol) in dichloromethane (2.0 mL) and the reaction mixture stirred at rt for 1 h. The reaction mixture was concentrated and the residue was partitioned between dichloromethane and saturated aqueous sodium bicarbonate solution. The organic phase was separated, dried over anhydrous sodium sulfate, filtered, and concentrated to afford (S)-methyl 2-methyl-6-(1-(piperidin-4-yl)-1H-pyrazol-4-yl)-5-propoxy-3,4-dihydroquinoline-1(2H)-carboxylate (0.070 g, 97%) as an off-white solid. 1H NMR (300 MHz, DMSO-d6) δ ppm 0.97 (t, J=7.48 Hz, 3H), 1.05-1.13 (m, 3H), 1.48 (dq, J=13.05, 6.50 Hz, 1H), 1.63-1.87 (m, 5H), 1.88-2.03 (m, 2H), 2.05-2.19 (m, 2H), 2.53-2.66 (m, 2H), 2.72-2.90 (m, 1H), 3.04 (br d, J=12.61 Hz, 2H), 3.54 (br t, J=6.60 Hz, 2H), 3.67 (s, 3H), 4.11-4.32 (m, 1H), 4.37-4.57 (m, 1H), 7.21-7.31 (m, 1H), 7.31-7.40 (m, 1H), 7.81 (s, 1H), 8.06 (s, 1H). MS (ESI, pos. ion) m/z 413 [M+H]+. MS (ESI, pos. ion) m/z 413 [M+H]+.

Provenance & Evidence