Ethyl Acetate → Tert-butyl 4-[3-(tetrahydropyran-2-yloxy)phenyl]piperazine-1-carboxylate

Participants

Reaction Steps

A mixturte of tert-butyl piperazine-1-carboxylate (2.94 g, 15.8 mmol), 2-(3-bromophenoxy)tetrahydropyran (3.69 g, 14.4 mmol), palladium acetate (64 mg, 0.29 mmol), BINAP (285 mg, 0.43 mmol) and sodium tert-butoxide (1.8 g, 18.7 mmol) in toluene (40 ml) was refluxed under a nitrogen atmosphere for 2 hours. Ethyl acetate and water were added to the reaction mixture, which was stirred for a while. The insoluble substances were removed by filtration through Celite, and the filtrate was then extracted with ethyl acetate. The extract was washed with brine, dried over magnesium sulfate, and then filtered. The filtrate was concentrated under reduced pressure, and the residue was purified by silica-gel column chromatography (n-hexane/ethyl acetate=20/1) to afford tert-butyl 4-[3-(tetrahydropyran-2-yloxy)phenyl]piperazine-1-carboxylate (5.3 g, yield 99%) as a colorless oil.

Provenance & Evidence