反应详情

Trifluoroacetic acid (3 mL) was added to a solution of (S)-methyl 6-(2-(1-(tert-butoxycarbonyl)piperidin-4-yl)-1H-imidazol-4-yl)-5-cyclobutoxy-2-methyl-3,4-dihydroquinoline-1(2H)-carboxylate (0.050 g, 0.09 mmol) in dichloromethane (6 mL), and the reaction mixture stirred at room temperature for 3 h. The reaction mixture was concentrated under vacuum, and the residue was purified via preparative-HPLC (Waters I): Column: Waters HSS C18, 2.1×50 mm, 1.8 um; Mobile Phase water (0.05% ammonium bicarbonate) and acetonitrile (5% to 95% acetonitrile in 10 min, flow rate: 20 mL/min); Detector: UV254&220 nm. This afforded methyl (S)-5-cyclobutoxy-2-methyl-6-(2-(piperidin-4-yl)-1H-imidazol-4-yl)-3,4-dihydroquinoline-1(2H)-carboxylate (0.0039 g, 10%) as an off-white solid. 1H NMR (300 MHz, CD3OD) δ ppm 1.15-1.26 (m, 2H), 1.32-1.68 (m, 3H), 1.95-2.55 (m, 8H), 2.97-3.19 (m, 3H), 3.40-3.47 (m, 2H), 3.77-3.82 (m, 2H), 4.13-4.25 (m, 1H), 4.51-4.71 (m, 3H), 7.28-7.47 (m, 2H), 8.55-8.61 (m, 1H). MS (ESI, pos. ion) m/z 425 [M+H]+.

1. concentrationThe reaction mixture was concentrated under vacuum
2. customthe residue was purified via preparative-HPLC (Waters I)
3. customMobile Phase water (0.05% ammonium bicarbonate) and acetonitrile (5% to 95% acetonitrile in 10 min, flow rate: 20 mL/min)