Pyridine → Trifluoroacetic acid

Participants

Reaction Steps

Acetic anhydride (3 μL, 0.034 mmol) was added to a solution of (5-chloro-2-fluorophenyl)(1-(2-(isopropylamino)-5,6,7,8-tetrahydropyrido[3,4-b]pyrazin-3-yl)piperidin-4-yl)methanone TFA salt (9.2 mg, 0.017 mmol) and pyridine (4 μL, 0.051 mmol) in DCM (170 μL) at rt. After 1 h, the mixture was purified by HPLC Method A to give the title compound as a TFA salt (4.0 mg, 40.4%) as a yellow film. 1H NMR (400 MHz, methanol-d4, mixture of rotamers) δ ppm 1.30-1.34 (m, 6H), 1.88-2.04 (m, 4H), 2.19 (s, 1.4H), 2.21 (s, 1.6H), 2.77-2.83 (m, 0.9H), 2.87-2.92 (m, 1.1H), 2.93-3.02 (m, 2H), 3.34-3.43 (m, 1H), 3.50-3.59 (m, 2H), 3.80-3.85 (m, 1.1H), 3.85-3.90 (m, 0.9H), 4.08-4.17 (m, 1H), 4.54 (br s, 2H), 7.25-7.32 (m, 1H), 7.59-7.63 (m, 1H), 7.76 (dd, J=6.1, 2.8 Hz, 1H); ESI-MS m/z [M+H]+ 474.3.

Provenance & Evidence