Sodium Carbonate → (R)-tert-Butyl 3-(4-amino-3-(4-phenoxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)piperidine-1-carboxylate

Participants

Reaction Conditions

Reaction Steps

A mixture of (R)-tert-butyl 3-[4-amino-3-iodo-1H-pyrazolo[3,4-d]pyrimidin-1-yl]piperidine-1-carboxylate (1 g, 2.25 mmol, 1.00 equiv), (4-phenoxyphenyl)boronic acid (530 mg, 2.48 mmol, 1.10 equiv), sodium carbonate (480 mg, 4.53 mmol, 2.01 equiv) and tetrakis(triphenylphosphine)palladium (78 mg, 0.07 mmol, 0.03 equiv) in 1,4-dioxane (60 mL) and water (15 mL) was stirred under nitrogen at 90° C. for 24 h. The reaction mixture was cooled to room temperature and then concentrated under vacuum. The residue was dissolved in 500 mL of dichloromethane. The resulting solution was washed with 200 mL of water, dried over anhydrous sodium sulfate and concentrated under vacuum. The residue was purified on a silica gel column eluted with dichloromethane/methanol (100/1) to give 700 mg (64%) of (R)-tert-butyl 3-[4-amino-3-(4-phenoxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl]piperidine-1-carboxylate as a yellow solid.

Provenance & Evidence