Trifluoroacetic acid → 1-(Azetidin-2-ylmethyl)-3-(2-fluoro-4-phenoxy-phenyl)pyrazolo[3,4-d]pyrimidin-4-amine

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Reaction Steps

To the crude tert-butyl 2-[[4-amino-3-(2-fluoro-4-phenoxy-phenyl)pyrazolo[3,4-d]pyrimidin-1-yl]methyl]azetidine-1-carboxylate (800 mg, 1.63 mmol) dissolved in DCM (4 mL) in ice bath, was dropwise added TFA (2 mL) slowly, stirring for 10 min at which point nostarting material remained by TLC analysis. The solvent was removed and EtOAc added, which was washed with 2M HCl. The combined aq. solution was adjusted with NaOH to pH around 10, and the aq. layer extracted with EtOAc. The combined organic layer was washed with brine, dried over Na2SO4, and the solvent removed to get 450 mg of 1-(azetidin-2-ylmethyl)-3-(2-fluoro-4-phenoxy-phenyl)pyrazolo[3,4-d]pyrimidin-4-amine, which was used in the next step directly without further purification.

Provenance & Evidence