Trifluoroacetic acid → (3S)-3-amino-1-[6-[6-(6-methylpyrazin-2-yl)pyrazolo[4,3-c]pyridin-1-yl]-2-pyridyl]piperidin-2-one

Participants

Reaction Steps

A solution of tert-butyl N-[(3S)-1-[6-[6-(6-methylpyrazin-2-yl)pyrazolo[4,3-c]pyridin-1-yl]-2-pyridyl]-2-oxo-3-piperidyl]carbamate (140 mg, 0.280 mmol) in dichloromethane 4.0 ml and trifluoroacetic acid (0.80 ml, 10 mmol) was stirred at RT 3 h. The reaction was concentrated and diluted with water then extracted with EtOAc. The aqueous layer was basified with 1M NaOH to pH 10 then extracted with EtOAc. The organic layers was dried with sodium sulfate, filtered, and concentrated in vacuum. The crude product was submitted for reverse phase HPLC to give 225 (44 mg, 39% yield). MS (ESI) m/z: 401.1. 1H NMR (400 MHz, DMSO) δ 9.60 (s, 1H), 9.47 (s, 1H), 9.33 (s, 1H), 8.72 (s, 1H), 8.64 (s, 1H), 8.05 (t, J=8.1 Hz, 1H), 7.82 (d, J=8.0 Hz, 1H), 7.74 (d, J=8.1 Hz, 1H), 4.46-4.33 (m, 1H), 4.14-4.02 (m, 1H), 3.58 (dd, J=10.8, 6.4 Hz, 1H), 2.65 (s, 3H), 2.24 (dt, J=11.4, 5.3 Hz, 1H), 2.19-2.00 (m, 2H), 1.77 (ddd, J=23.0, 10.6, 5.1 Hz, 1H).

Provenance & Evidence