Methanesulfonyl chloride → Trifluoroacetic acid

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Reaction Steps

A solution of N-(2,2-difluoroethyl)-2-(4-(2,4-difluorophenoxyl)piperidin-1-yl)-5-methyl-5,6,7,8-tetrahydropyrido[3,4-b]pyrazin-3-amine TFA salt (15 mg, 0.027 mmol), DIPEA (14.2 μL, 0.081 mmol), and methanesulfonyl chloride (3.2 μL, 0.041 mmol) in DCM (271 μL) was stirred overnight. Purification by HPLC Method A gave the title compound as a TFA salt (6.4 mg) as a white film. 1H NMR (500 MHz, methanol-d4) δ ppm 1.54 (d, J=6.8 Hz, 3H), 1.91-2.02 (m, 2H), 2.07-2.19 (m, 2H), 2.66 (dd, J=16.8, 3.2 Hz, 1H), 2.91 (s, 3H), 2.93-3.06 (m, 3H), 3.34-3.48 (m, 3H), 3.68-3.88 (m, 2H), 3.98 (dd, J=14.2, 6.4 Hz, 1H), 4.45 (dt, J=7.4, 3.8, Hz, 1H), 4.77 (q, J=6.8 Hz, 1H), 5.87-6.21 (m, 1H), 6.82-6.92 (m, 1H), 6.98 (ddd, J=11.4, 8.7, 2.9 Hz, 1H), 7.17 (td, J=9.2, 5.6 Hz, 1H); ESI-MS m/z [M+H]+ 518.80.

Provenance & Evidence