Formaldehyde → Trifluoroacetic acid

Participants

Reaction Steps

Sodium triacetoxyhydroborate (9.9 mg, 0.047 mmol) was added to a solution of DIPEA (8 μL, 0.047 mmol), 2-(4-(2,4-difluorophenoxyl)piperidin-1-yl)-N-isopropyl-5,6,7,8-tetrahydropyrido[3,4-b]pyrazin-3-amine TFA salt (12.1 mg, 0.023 mmol) and formaldehyde (2 μL, 0.023 mmol) in MeOH (230 μL) at rt. After 30 min, the mixture was purified by HPLC Method A to give the title compound as a TFA salt (8.9 mg, 71.6%) as a yellow film. 1H NMR (400 MHz, methanol-d4) δ ppm 1.24 (d, J=6.3 Hz, 6H), 1.90-2.00 (m, 2H), 2.08-2.17 (m, 2H), 2.95-3.06 (m, 3H), 3.12 (br s, 4H), 3.35-3.53 (m, 3H), 3.76 (br s, 1H), 4.15 (dt, J=13.1, 6.5, 6.5 Hz, 1H), 4.19-4.38 (m, 2H), 4.48 (tt, J=7.3, 3.7 Hz, 1H), 6.85-6.92 (m, 1H), 6.99 (ddd, J=11.4, 8.5, 3.0 Hz, 1H), 7.17 (td, J=9.2, 5.6 Hz, 1H); ESI-MS m/z [M+H]+ 418.3.

Provenance & Evidence