Trifluoroacetic acid → 1-(3-azetanyl)-3-(4-phenoxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-4-amine

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To a solution of tert-butyl 3-[4-amino-3-(4-phenoxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl]-1-azetanecarboxylate (0.81 g, 0.0018 mol) in dichloromethane (5 mL) was slowly added a 20% solution of trifluoroacetic acid in dichloromethane (10 mL) at 0° C. under an atmosphere of nitrogen. The mixture was warmed to room temperature and stirred for eighteen hours. The solvent was removed under reduced pressure. An aqueous solution of 5 N sodium hydroxide was added to the residue to pH 11 at 0° C. The water phase was extracted with ethyl acetate (2×30 mL). The combined organic extracts were washed with water (1×60 mL) and brine (1×60 mL) and dried over sodium sulfate. The solvent was removed under reduced pressure to yield 1-(3-azetanyl)-3-(4-phenoxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-4-amine (0.44 g, 0.0012 mol).

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