反応手順
A solution of N-(2,2-difluoroethyl)-3-(4-(2,4-difluorophenoxyl)piperidin-1-yl)-7-methyl-5,6,7,8-tetrahydropyrido[3,4-b]pyrazin-2-amine TFA salt (10 mg, 0.018 mmol), 2,2-difluoroacetic anhydride (4.7 mg, 0.027 mmol), and DIPEA (7.0 mg, 0.054 mmol) in DCM (90 μL) was stirred at room temperature for 2 h. The crude reaction mixture was diluted in DMF, filtered through a hydrophilic PTFE 0.45 μm filter (Millipore® Millex-LCR), and purified via HPLC Method A to give the title compound as a TFA salt (5 mg) as a white solid. 1H NMR (400 MHz, methanol-d4, mixture of rotamers) δ ppm 1.21 (d, J=7.1 Hz, 1.2H), 1.29 (d, J=6.6 Hz, 1.8H), 1.92-2.03 (m, 2H), 2.09-2.19 (m, 2H), 2.58-2.69 (m, 1H), 2.98-3.07 (m, 2.4H), 3.11-3.17 (m, 0.6H), 3.35-3.44 (m, 2H), 3.78 (td, J=14.5, 4.3 Hz, 2H), 4.11 (d, J=17.2 Hz, 1H), 4.42-4.51 (m, 1H), 4.60-4.67 (m, 0.6H), 4.73-4.77 (m, 0.4H), 5.05 (d, J=17.7 Hz, 0.6H), 5.11-5.18 (m, 0.4H), 5.89-6.22 (m, 1H), 6.39-6.73 (m, 1H), 6.85-6.91 (m, 1H), 6.99 (ddd, J=11.4, 8.6, 3.0 Hz, 1H), 7.18 (td, J=9.3, 5.4 Hz, 1H); ESI-MS m/z [M+H]+ 517.9.
