反应详情

4-(4-(1-n-Propyl)phenyl)butanoic acid (19.3 g) was disolved in dichloromethane and 25 mL of oxalyl chloride was added. After gas evolution ceased (~3 h) the mixture was concentrated in vacuo. To a solution of 4(S)-phenylmethyl-2-oxazolidinone (16.6 g, 93.6 mmol) in 250 mL of dry THF at -78° C. was added butyl lithium (64.4 mL, 1.6M, 102.99 mmol). After 5 min, a solution of the acid chloride in THF was added via cannula. After 15 min, the reaction was partitioned between ethyl acetate and 2N hydrchloric acid and the layers separated. The organics were washed twice with 2N hydrochloric acid and three times with dilute sodium bicarbonate then dried over sodium sulfate, filtered, and concentrated in vacuo. The product was purified by flash filtration through silica-gel eluting with 10% ethyl acetate in hexane to give a pale-yellow oil which crystallized upon dissolution in 5% ethyl acetate in hexane. The mixture was concentrated and recrystallized from hexane to afford the title compound as colorless needles (20.8 g): 400 MHz 1H NMR (CDCl3) δ 7.4-7.0 (m, 9H), 4.63 (m, 1H), 4.14 (m, 2H), 3.20 (dd, 1H, J=3.30, 13.27 Hz), 2.97 (m, 2H), 2.73 (dd, 1H, J=9.72, 13.42 Hz), 2.67 (t, 2H, J=7.68 Hz), 2.53 (t, 2H, J=7.61 Hz), 2.00 (m, 2H), 1.61 (m, 2H), 0.92 (t, 3H, J=7.33 Hz).

1. custom(~3 h)
2. concentrationwas concentrated in vacuo
3. waitAfter 15 min
4. customthe reaction was partitioned between ethyl acetate and 2N hydrchloric acid
5. customthe layers separated
6. washThe organics were washed twice with 2N hydrochloric acid and three times with dilute sodium bicarbonate
7. dry with materialthen dried over sodium sulfate
8. filtrationfiltered
9. concentrationconcentrated in vacuo
10. filtrationThe product was purified by flash filtration through silica-gel
11. washeluting with 10% ethyl acetate in hexane
12. customto give a pale-yellow oil which
13. customcrystallized upon dissolution in 5% ethyl acetate in hexane
14. concentrationThe mixture was concentrated
15. customrecrystallized from hexane