Hydrochloric Acid → (4-(2-Chloro-5-fluorophenyl)piperidin-1-yl)(4,5,6,7-tetrahydro-1Hpyrazolo[4,3-c]pyridin-3-yl) methanone Hydrochloride

Participants

Reaction Steps

To a solution of tert-butyl 3-(4-(2-chloro-5-fluorophenyl)piperidine-1-carbonyl)-6,7-dihydro-1H-pyrazolo[4,3-c]pyridine-5(4H)-carboxylate (49, 78 mg, 0.17 mmol) in CH2Cl2 (2 mL) was added HCl (2N in Et2O, 2 mL). The mixture stirred for 18 h at ambient temperature. The reaction mixture was concentrated under reduced pressure to yield (4-(2-chloro-5-fluorophenyl)piperidin-1-yl)(4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridin-3-yl)methanone hydrochloride (50) as a white solid (64 mg, 94%): 1H NMR (300 MHz, DMSO-d6) δ 9.19 (br s, 2H), 7.49 (dd, J=8.7, 5.4 Hz, 1H), 7.27 (dd, J=10.2, 3.0 Hz, 1H), 7.17-7.07 (m, 1H), 5.34-5.05 (m, 1H), 4.79-4.56 (m, 1H), 4.38-4.19 (m, 2H), 3.44-3.07 (m, 4H, overlaps with H2O), 3.01-2.76 (m, 3H), 1.92-1.73 (m, 2H), 1.71-1.50 (m, 2H), missing N—H pyrazole; ESI MS m/z 363 [M+H]+.

Provenance & Evidence