Allyl acetate → 2-Allyl-2-phenylcyclohexanone

Beteiligte Stoffe

Reaktionsschritte

To a solution of 2-phenylcyclohexanone (2 g, 11.48 mmol) in 50 ml of anhydrous DME in an ice bath was added 1M sodium bis(trimethylsilyl)amide (12.63 mL, 12.63 mmol) dropwise and the solution was stirred at the same temp for 20 minutes. In a separated flask allylpalladium chloride dimer (0.104 g, 0.287 mmol) was dissolved in 10 ml of anhydrous DME, and was added triphenylphosphine (0.151 g, 0.574 mmol) to the solution. It was stirred for 20 minutes at room temp and then allyl acetate (1.300 mL, 12.05 mmol) was added. This solution was added to the anion solution dropwise and the mixture was stirred at room temp for 2 hrs. The reaction was quenched with saturated NH4Cl and extracted with hexane. The organic layer was washed with brine. The combine aqueous layers were back-extracted with hexane once and combined. Dried over Na2SO4 and evaporated to give an oily residue. It was purified by Combiflash (120 g silica gel) eluting with hexane followed by 1:9 EtOAc-hexane to give 2.24 g of 2-allyl-2-phenylcyclohexanone. 1H NMR (400 MHz, CCl3D) δ ppm 7.35 (2H, t, J=7.58 Hz), 7.21-7.27 (1H, m), 7.12-7.18 (2H, m), 5.35-5.52 (1H, m), 4.82-4.97 (2H, m), 2.61-2.72 (1H, m), 2.39-2.55 (2H, m), 2.24-2.38 (2H, m), 1.89-1.99 (1H, m, J=9.39, 6.15, 2.88, 2.88 Hz), 1.62-1.81 (4H, m).

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