Pentanoic Acid → (4S,5R)-4-Methyl-3-pentanoyl-5-phenyl-oxazolidin-2-one

Temperature

0 °C

To a 0° C. stirred solution of valeric acid (3.83 mL, 35.2 mmol) and Et3N (14.7 mL, 106 mmol) in dry THF (175 mL) was added trimethylacetyl chloride (5.29 mL, 42.3 mmol) dropwise. The mixture was stirred at 0° C. for 1 hour and (4S,5R)-(−)-4-methyl-5-phenyl-2-oxazolidinone (7.50 g, 42.3 mmol) was added followed by LiCl (1.79 g, 42.3 mmol). The reaction was warmed to room temperature overnight with good stirring. The mixture was filtered and the filtrate was concentrated under reduced pressure. Et2O (75 mL) was added to the residue, which was washed with sat. NaHCO3 (3×40 mL), 1N HCl (3×40 mL), and brine (2×40 mL). The organic phase was dried over MgSO4, filtered and concentrated under reduced pressure to give a quantitative yield of crude product.

1. temperatureThe reaction was warmed to room temperature overnight with good stirring
2. filtrationThe mixture was filtered
3. concentrationthe filtrate was concentrated under reduced pressure
4. additionEt2O (75 mL) was added to the residue, which
5. washwas washed with sat. NaHCO3 (3×40 mL), 1N HCl (3×40 mL), and brine (2×40 mL)
6. dry with materialThe organic phase was dried over MgSO4
7. filtrationfiltered
8. concentrationconcentrated under reduced pressure

ORD record

ord-9588e0009edb46169dab5a77c0f54ace

Source dataset

uspto-grants-2007_02

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07179934B2