反应详情

Sodium hydride (0.1702 g, 7.09 mmol) was added slowly to a NaCl ice bath containing EtOH (2.6 mL, 2.7 M) stirring under N2. 4-Phenylpentan-2-one (55) (1.0493 g, 6.47 mmol) and diethyloxalate (0.88 mL, 6.47 mmol) were mixed together, and then added to the chilled NaOEt solution. After stirring for 5 minutes, the reaction was warmed to room temperature. After 90 min, the reaction was quenched at 0° C. with 1N HCl and extracted 2× with CH2Cl2. The combined organics were washed with H2O, dried with Na2SO4, filtered, concentrated to provide 56 (0.7230 g, 42.6%) which was used without further purification in the next step. 1H (CDCl3, 400 MHz): δ 7.34-7.16 (5H, m), 6.30 (1H, s), 4.33 (2H, q, J=7.0 Hz), 3.39-3.26 (1H, m), 2.82 (1H, dd, J=15.1, 6.8 Hz), 2.72 (1H, dd, J=15.1, 7.8 Hz), 1.36 (3H, t, J=7.0 Hz), 1.32 (3H, d, J=6.8 Hz) ppm. HPLC: 10.934 min.

1. stirringAfter stirring for 5 minutes
2. customthe reaction was quenched at 0° C. with 1N HCl
3. extractionextracted 2× with CH2Cl2
4. washThe combined organics were washed with H2O
5. dry with materialdried with Na2SO4
6. filtrationfiltered
7. concentrationconcentrated