Trifluoroacetic acid → 2-(1-azetidin-3-ylmethyl-6-fluoro-1H-indazol-3-yl)-5H-pyrrolo[2,3-b]pyrazine-7-carboxylic acid tert-butyl amide trifluoroacetate

Participants

Reaction Steps

To a stirred solution of tert-butyl 3-((3-(7-(tert-butylcarbamoyl)-5-((2-(trimethylsilyl)ethoxy)methyl)-5H-pyrrolo[2,3-b]pyrazin-2-yl)-6-fluoro-1H-indazol-1-yl)methyl)azetidine-1-carboxylate (70 mg, 107 μmol) in dichloromethane (5 mL) was added trifluoroacetic acid (1 mL). After 15 h the mixture was concentrated in vacuo and the residue dissolved in 25 mL of a Jan. 10, 1960 mixture of ammonium hydroxide/methanol/dichloromethane. After 1 h the mixture was concentrated in vacuo. Purification by chromatography (silica, 24 g Analogix column, 0-6% methanol containing 10% ammonium hydroxide in dichloromethane) followed by SFC chromatography (eluent contained TFA) gave 2-(1-azetidin-3-ylmethyl-6-fluoro-1H-indazol-3-yl)-5H-pyrrolo[2,3-b]pyrazine-7-carboxylic acid tert-butyl amide trifluoroacetate (10 mg, 17%). MS (M+H)+=422; 1H NMR (DMSO-d6) δ: 9.09 (s, 1H), 8.49 (dd, J=8.9, 5.4 Hz, 1H), 8.40 (s, 1H), 7.92 (s, 1H), 7.77 (dd, J=9.8, 1.9 Hz, 1H), 7.20 (d, J=2.1 Hz, 1H), 4.77 (d, J=7.0 Hz, 2H), 3.87-4.18 (m, 4H), 1.52 (s, 9H), 1.24 (d, J=4.5 Hz, 1H).

Provenance & Evidence