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To a solution of 2-(4-(2,4-difluorophenoxyl)piperidin-1-yl)-N-isopropyl-5,6,7,8-tetrahydropyrido[3,4-b]pyrazin-3-amine TFA salt (39.0 mg, 0.075 mmol) in DCM (754 μL) at 0° C. was added triethylamine (31.5 μL, 0.226 mmol) and 2-methoxyacetyl chloride (13.8 μL, 0.151 mmol). The reaction was stirred at 0° C. for 30 min. The reaction mixture was concentrated under reduced pressure and was purified by HPLC Method B, with the exception that a Waters SunFire™ C18, 5 μm, ID 30×75 mm column was used, using a 55% to 80% ACN gradient to give the title compound, as a TFA salt, as a yellow oil (14.0 mg, 31.5%). 1H NMR (400 MHz, methanol-d4, mixture of rotamers) δ ppm 1.30 (m, 6H), 1.96 (m, 2H), 2.13 (m, 2H), 2.75 (t, J=5.7 Hz, 0.7H), 2.83 (t, J=5.7 Hz, 1.3H), 3.08 (m, 2H), 3.44 (m, 5H), 3.77 (t, J=5.8 Hz, 1.3H), 3.88 (t, J=5.9 Hz, 0.7H), 4.14 (m, 1H), 4.24 (s, 0.7H), 4.28 (s, 1.3H), 4.49 (td, J=7.1, 3.5 Hz, 1H), 4.56 (s, 0.7H), 4.63 (s, 1.3H), 6.88 (m, 1H), 6.99 (ddd, J=11.2, 8.5, 3.0 Hz, 1H), 7.18 (td, J=9.2, 5.6 Hz, 1H); ESI-MS m/z [M+H]+ 476.5.

1. concentrationThe reaction mixture was concentrated under reduced pressure
2. customwas purified by HPLC Method B, with the exception that a Waters SunFire™ C18, 5 μm, ID 30×75 mm column