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

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To a solution of tert-butyl N-[1-[3-[(2R)-2-[[4-amino-3-(2-fluoro-4-phenoxy-phenyl)pyrazolo[3,4-d]pyrimidin-1-yl]methyl]pyrrolidin-1-yl]-2-cyano-3-oxo-prop-1-enyl]cyclopropyl]carbamate (27 mg, 0.04 mmol) in DCM (3 mL) was added TFA (1 mL). The solution was stirred for 5 hrs. and then concentrated. The residue was purified by prep-TLC (5% MeOH/DCM) to provide 2.68 mg (12%) of the title compound. MS (pos. ion) m/z: 539 (M+1).

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