2-Acetylnaphthalene → alpha-Methylnaphthalene-2-methanol

Participants

Reaction Conditions

Reaction Steps

Tris(triphenylphosphine)ruthenium(II) chloride (3.8 mg, 4 μmol, 1 mol %) and a chiral ligand (M=Ru, R=t-Bu, Ar=3,5-t-Bu2C6H3—, 2.6 μmol, 0.65 mol %) were dissolved in dichloromethane (3 mL) under nitrogen atmosphere, and then heated and stirred for 0.5 h at 40° C. After the mixture was cooled to room temperature, 2-acetonaphthone (0.4 mmol), dichloromethane (2 mL) and an aqueous solution of potassium hydroxide (0.2 mL, 0.2 M) were added thereto. Thereafter, the reaction system was placed in an autoclave, and stirred for 24 h under H2 (10 atm) at 50° C. The solvent was removed under reduced pressure, and the resultants were separated by column chromatography (silica gel column; eluent: ethyl acetate/petroleum ether=1/5). Accordingly, pure 1-(2-naphthyl)ethanol was obtained and the ee value (ee=98%) was measured by GC analysis.

Provenance & Evidence