Diethyl Ether → (R)-3-((R)-3-Methyl-hexanoyl)-4-phenyl-oxazolidin-2-one

Participants

Reaction Steps

To the copper (1) bromide dimethylsulfide complex (13.34 g, 64.87 mmol) in dry THF (150 mL) at −30° C. under Nitrogen was added a 2M ether solution of Propylmagnesiumchloride (64.87 mL, 129.7 mmol) and stirred for 20 minutes. (R)-3-But-2-enoyl-4-phenyl-oxazolidin-2-one (15.0 g, 64.87 mmol) in THF (60 mL) was added over a 15 minute period at −35° C. and let slowly warm up to room temperature over 4 hours. The mixture was cooled to 0° C. and quenched with saturated ammonium chloride solution. The suspension was extracted into ether, washed with 5% ammonium hydroxide solution and then with brine and dried over MgSO4. The solution was concentrated under reduced pressure to afford the titled compound (13.34 g; 100% yield) as a white solid: 1H NMR (400 MHz, CDCl3) δ ppm 0.8 (m, 6H) 1.2 (m, 3H) 1.6 (s, 1H) 2.0 (m, 1H) 2.7 (dd, J=16.1, 8.5 Hz, 1H) 3.0 (dd, J=15.9, 5.4 Hz, 1H) 4.3 (dd, J=8.9, 3.8 Hz, 1H) 4.7 (t, J=8.9 Hz, 1H) 5.4 (dd, J=8.8, 3.9 Hz, 1H) 5.4 (dd, J=8.8, 3.9 Hz, 1H) 7.3 (m, 5H). MS, m/z (relative intensity): 276 [M+1H, 100%].

Provenance & Evidence