Pyridine → Trifluoroacetic acid

Participants

Reaction Steps

Acetic anhydride (7 μL, 0.075 mmol) was added to a solution of 3-(4-((2,4-difluorophenyl)fluoromethyl)piperidin-1-yl)-N-isopropyl-5,6,7,8-tetrahydropyrido[3,4-b]pyrazin-2-amine TFA salt (20.1 mg, 0.038 mmol) and pyridine (9 μL, 0.113 mmol) in DCM (380 μL) at rt. After 1 h, the mixture was purified by HPLC Method A to give the title compound as a TFA salt (20.1 mg, 93%) as a yellow film. 1H NMR (400 MHz, methanol-d4) δ ppm 1.29 (dd, J=6.4, 1.9 Hz, 6H), 1.46 (br s, 1H), 1.56-1.77 (m, 2H), 2.00 (d, J=12.9 Hz, 1H), 2.04-2.15 (m, 1H), 2.18 (s, 1.3H), 2.20 (s, 1.7H), 2.76 (qd, J=12.8, 2.4 Hz, 3H), 2.87 (t, J=5.9 Hz, 1H), 3.40-3.56 (m, 2H), 3.78-3.83 (m, 1.1H), 3.83-3.89 (m, 0.9H), 4.09-4.17 (m, 1H), 4.52 (s, 2H), 5.53 (dd, J=46.7, 7.6 Hz, 1H), 6.97-7.08 (m, 2H), 7.47-7.55 (m, 1H); ESI-MS m/z [M+H]+ 462.4.

Provenance & Evidence