Trifluoroacetic acid → HCID 71279506, compound

Participants

Reaction Conditions

Reaction Steps

To a pale yellow solution of N-tert-butyl-2-(5-(difluoromethoxy)-1-(3-(3-hydroxyazetidin-1-yl)propyl)-1H-indazol-3-yl)-5-((2-(trimethylsilyl)ethoxy)methyl)-5H-pyrrolo[2,3-b]pyrazine-7-carboxamide (43 mg, 66.8 μmol) in dichloromethane (4.00 mL) was added TFA (740 mg, 0.5 mL, 6.49 mmol, Eq: 97.2), 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 foam, which was dissolved in dichloromethane (with few drops of MeOH) and purified by chromatography (spherical silica 20-45 μm, 23 g, Versaflash Supelco) eluting with 0 to 10% 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-(5-(difluoromethoxy)-1-(3-(3-hydroxyazetidin-1-yl)propyl)-1H-indazol-3-yl)-5H-pyrrolo[2,3-b]pyrazine-7-carboxamide (21 mg, 40.9 μmol, 61.2%). MS (M+H)+=514; 1H NMR (DMSO-d6) δ: 9.06 (s, 1H), 8.37 (s, 1H), 8.19 (s, 1H), 7.81-7.91 (m, 2H), 7.39 (d, J=8.7 Hz, 1H), 7.19 (t, J=74.4 Hz, 1H), 5.23 (d, J=6.4 Hz, 1H), 4.53 (t, J=6.6 Hz, 2H), 4.07-4.25 (m, 1H), 3.50 (t, J=6.4 Hz, 2H), 2.62 (t, J=6.8 Hz, 2H), 2.35 (t, J=6.8 Hz, 2H), 1.78-2.01 (m, 2H), 1.49 (s, 9H).

Provenance & Evidence