Diisopropylethylamine → (2-(4-(2,4-difluorophenoxy)piperidin-1-yl)-3-(isopropylamino)-7,8-dihydropyrido[3,4-b]pyrazin-6(5H)-yl)(tetrahydrofuran-2-yl)methanone

Participants

Reaction Steps

To a solution of tetrahydrofuran-2-carboxylic acid (10.9 μL, 0.113 mmol) in DMA (0.35 mL) at room temperature was added DIPEA (39.5 μL, 0.226 mmol), followed by HATU (43.0 mg, 0.113 mmol). After stirring for 5 min, the reaction mixture was treated with 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 DMA (0.4 mL). The reaction mixture was stirred at 60° C. for 30 min. The reaction mixture was allowed to cool to room temperature and was purified directly 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 (16.0 mg, 34.5%). 1H NMR (400 MHz, methanol-d4) δ ppm 1.31 (m, 6H), 1.97 (m, 4H), 2.16 (m, 4H) 2.82 (m, 2H), 3.10 (m, 2H), 3.45 (m, 2H), 3.89 (m, 4H), 4.14 (m, 1H), 4.44-4.87 (m, 4H), 6.88 (m, 1H), 6.99 (ddd, J=11.2, 8.5, 3.0 Hz, 1H), 7.18 (td, J=9.2, 5.3 Hz, 1H); ESI-MS m/z [M+H]+ 502.6.

Provenance & Evidence