(3-hydroxyphenyl)boronic Acid → 3-[1-methyl-4-(8-oxa-3-azabicyclo[3.2.1]oct-3-yl)-1H-pyrazolo[3,4-d]pyrimidin-6-yl]phenol

Participants

Reaction Conditions

Reaction Steps

A mixture of 3-(6-chloro-1-methyl-1H-pyrazolo[3,4-d]pyrimidin-4-yl)-8-oxa-3-azabicyclo[3.2.1]octane (95 mg, 0.34 mmol), 3-hydroxyphenylboronic acid (70 mg, 0.51 mmol), and tetrakis(triphenylphosphine)palladium(0) (39 mg, 10 mol %) in toluene/ethanol (1:1, 3 mL) and 2 M aqueous sodium carbonate solution (2 mL) was heated in a Smith process vial in the microwave reactor for one hour at 120° C. The cooled mixture was partitioned between ethyl acetate and water. The aqueous phase was acidified with 1 M aqueous hydrochloric acid and then extracted three times with ethyl acetate. The combined extracts were washed successively with water, saturated aqueous sodium hydrogen carbonate solution and saturated aqueous sodium chloride solution. The extracts were then dried over anhydrous magnesium sulfate, filtered, and concentrated to dryness under reduced pressure. The crude residue was purified via reverse-phase high performance liquid chromatography using a Phenomenex Prodigy 21 mm×250 mm column, running a gradient elution of 5% acetonitrile/95% of 0.1% aqueous trifluoroacetic acid to 90% acetonitrile to provide, after concentration, 3-[1-methyl-4-(8-oxa-3-azabicyclo[3.2.1]oct-3-yl)-1H-pyrazolo[3,4-d]pyrimidin-6-yl]phenol. MS (ES+): 338.0 (M+H)+

Provenance & Evidence