Trifluoroacetic acid → HCID 71288774, compound

Participants

Reaction Steps

To a solution of 2-(1-methyl-1H-thieno[3,2-c]pyrazol-3-yl)-5-(2-trimethylsilanylethoxymethyl)-5H-pyrrolo[2,3-b]pyrazine-7-carboxylic acid [(R)-2-(3-cyano-azetidin-1-yl)-1-methyl-2-oxo-ethyl]-amide (131 mg, 0.23 mmol) in CH2Cl2 (2 mL) was added TFA (0.75 mL). The reaction mixture was stirred at room temperature for 5 h then concentrated. The residue was redissolved in 10:90:0.5 MeOH/CH2Cl2/NH4OH (3 mL) and stirred at room temperature for 3 h. The reaction mixture was concentrated and the residue was purified by silica gel chromatography with 0% to 10% MeOH/CH2Cl2 to afford 83 mg (83%) of 2-(1-methyl-1H-thieno[3,2-c]pyrazol-3-yl)-5H-pyrrolo[2,3-b]pyrazine-7-carboxylic acid [(R)-2-(3-cyano-azetidin-1-yl)-1-methyl-2-oxo-ethyl]-amide as a white solid. MS (M+Na)+=457; mp=310-320° C.; 1H NMR (DMSO-d6, 300 MHz): δ (ppm) 12.93 (br. s., 1H), 9.07 (s, 1H), 8.46 (d, J=11.0 Hz, 1H), 8.19 (d, J=7.9 Hz, 1H), 7.82 (d, J=5.3 Hz, 1H), 7.32 (d, J=5.3 Hz, 1H), 4.42-4.77 (m, 3H), 4.13-4.21 (m, 1H), 4.12 (s, 3H), 3.97-4.08 (m, 1H), 3.76-3.89 (m, 1H), 1.51 (dd, J=6.8, 2.6 Hz, 3H).

Provenance & Evidence