Trifluoroacetic acid → 2-((R)-2-((4-amino-3-(2-fluoro-4-phenoxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)pyrrolidine-1-carbonyl)-4-(ethylamino)-4-methylpent-2-enenitrile

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Reaction Steps

To a solution of tert-butyl 5-((R)-2-((4-amino-3-(2-fluoro-4-phenoxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)pyrrolidin-1-yl)-4-cyano-2-methyl-5-oxopent-3-en-2-yl(ethyl)carbamate (60 mg, 0.089 mmol) in DCM (10 mL) was added 2.5 mL of CF3COOH. The mixture was stirred for 2 h at room temperature. The volatile phase was removed under reduced pressure and the residue was purified on Prep-HPLC. Conditions: (1#-Pre-HPLC-001(SHIMADZU)): Column, SunFire Prep C18, 19*150 mm 5 um; mobile phase, water with 0.05% TFA and CH3CN (40% CH3CN up to 100% in 20 min); Detector, 254 nm. This resulted 12 mg (16%) of the title compound as a white solid and bis TFA salt. LC-MS: m/z 569 (M+H+). H-NMR (400 MHz, CD3OD, ppm): 8.37 (s, 1H), 7.72 (s, 1H), 7.57 (t, J=8.4 Hz, 1H), 7.48 (t, J=8.0 Hz, 2H), 7.28 (t, J=7.2 Hz, 1H), 7.17 (d, 8.0 Hz, 2H), 6.97 (dd, J=8.4 Hz, 2.0 Hz, 1H), 6.91 (dd, J=11.6 Hz, 2.0 Hz, 1H), 4.95-4.82 (m, 2H), 4.70-4.65 (m, 1H), 3.71-3.65 (m, 3H), 3.59-3.55 (m, 1H), 2.15-2.11 (m, 1H), 2.02-1.93 (m, 2H), 1.81-1.79 (m, 1H), 1.53 (s, 3H), 1.47 (s, 3H), 1.29 (t, J=7.2 Hz, 3H).

Provenance & Evidence