Dichloromethane → 4-Hydroxy-4-(4-pyrimidin-2-ylphenyl)-piperidine-1-carboxylic acid tert-butyl ester

Participants

Reaction Conditions

Reaction Steps

4-(4-bromophenyl)-4-hydroxypiperidine-1-carboxylic acid tert-butyl ester (800 mg, 2.25 mmol), bis(pinacolate)diboron (856 mg, 3.37 mmol), PdCl2(dppf).CH2Cl2 (184 mg, 0.23 mmol), potassium acetate (660 mg, 6.74 mmol) were weighted into a sealed-tube. Methyl sulfoxide (20 ml) was added and the mixture was purged with nitrogen for 20 min before it was heated at 100° C. for 2 hr under nitrogen. The mixture was cooled to r.t. Potassium carbonate (1.55, 11.2 mmol), 2-bromopyrimidine (429 mg, 2.70 mmol) and water (10 ml) were added. The mixture was again purged with nitrogen for 20 min. Palladium tetrakistriphenylphosphine (260 mg, 0.23 mmol) was added and the final mixture was stirred at 100° C. for a further 2 hr. After being cooled to r.t., ethyl acetate and water were added. The mixture was filtered through a pad of Celite. Layers were separated and the organic layer was washed with water (×2). The combined aqueous layers were extracted with ethyl acetate (×1). The combined organic layers were dried (MgSO4) and filtered. Solvents were removed in vacuum and column chromatography [ethyl acetate-hexane, 1:1 (v/v)] gave 4-hydroxy-4-(4-pyrimidin-2-ylphenyl)-piperidine-1-carboxylic acid tert-butyl ester (639 mg, 80%) as colorless oil.

Provenance & Evidence