Trifluoroacetic acid → HCID 71280175, compound

Participants

Reaction Conditions

Reaction Steps

To a pale yellow solution of N-tert-butyl-2-(1-(3-(3,3-difluoroazetidin-1-yl)propyl)-5-(difluoromethoxy)-1H-indazol-3-yl)-5-((2-(trimethylsilyl)ethoxy)methyl)-5H-pyrrolo[2,3-b]pyrazine-7-carboxamide (38 mg, 57.2 μmol) in dichloromethane (4.00 mL) was added TFA (1.48 g, 1.00 mL, 13.0 mmol27), the reaction mixture turned orange and was stirred at 25° C. for 18 h, mixture concentrated and the residue was re-dissolved in 5 mL of a solution of (dichloromethane/MeOH/ammonium hydroxide; 60:10:1) and stirred at 25° C. for 1 h, then evaporated to a yellow solid, which was dissolved in dichloromethane and purified by chromatography (spherical silica 20-45 μm, 23 g, Versaflash Supelco) eluting with 0 to 5% over 20 min (MeOH containing 10% ammonium hydroxide)/dichloromethane. The pure product dissolved in dichloromethane and cyclohexane added to allow solid formation, off-white solid was separated by decantation and dried under high vacuum to give N-tert-butyl-2-(1-(3-(3,3-difluoroazetidin-1-yl)propyl)-5-(difluoromethoxy)-1H-indazol-3-yl)-5H-pyrrolo[2,3-b]pyrazine-7-carboxamide (29.5 mg, 55.3 μmol, 96.6%). MS (M+H)+=534; 1H NMR (DMSO-d6) δ: 9.07 (s, 1H), 8.37 (s, 1H), 8.19 (s, 1H), 7.81-7.96 (m, 2H), 7.40 (d, J=8.3 Hz, 1H), 7.19 (t, J=74.4 Hz, 1H), 4.56 (br. s., 2H), 3.56 (t, J=12.5 Hz, 4H), 2.54 (br. s., 2H), 1.95 (m, J=6.2 Hz, 2H), 1.49 (s, 9H).

Provenance & Evidence