Hydrochloric Acid → 3-iodo-1-tetrahydro-1H-3-pyrrolyl-1H-pyrazolo[3,4-d]pyrimidin-4-amine hydrochloride

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Reaction Steps

To a solution of 3-iodo-1H-pyrazolo[3,4-d]pyrimidin-4-amine (5.610 g, 21.49 mmol) in tetrahydrofuran (200 mL) was added rac-tert-butyl 3-hydroxy-1-pyrrolidinecarboxylate (6.039 g, 32.25 mmol), triphenylphosphine (11.273 g, 42.98 mmol), and diethyl azodicarboxylate (7.485 g, 6.77 mL, 42.98 mmol). The reaction mixture was stirred at room temperature for 6 days and then concentrated to afford an orange-brown oil. Acetone (100 mL) and 5 N hydrochloric acid (50 mL) were added and the solution was heated at 40° C. for 18 h and then cooled to room temperature. The resulting yellow precipitate was filtered, and the filter cake was washed with diethyl ether and dried to afford rac-3-iodo-1-tetrahydro-1H-3-pyrrolyl-1H-pyrazolo[3,4-d]pyrimidin-4-amine monohydrochloride as an off-white solid (5.153 g, 65%). RP-HPLC Rt 4.079 min, 99% purity (5% to 85% acetonitrile/0.1M aqueous ammonium acetate, buffered to pH 4.5, over 20 min at 1 mL/min; λ=254 nm; Deltapak C18, 300 Å, 5 μm, 150×3.9 mm column); m/z 331 (MH+).

Provenance & Evidence