反应详情

温度

0 °C

To a dry 250 mL flask under a nitrogen atmosphere was added phenethyl alcohol (2.50 g, 0.02 mol), anhydrous dichloromethane (150 mL), and methyl-4-chloro-4-oxobutyrate (6.02 g, 0.04 mol). The contents of the flask were cooled to 0° C. with an ice bath. To the solution was added aluminum chloride (25 g, 0.2 mol) in portions being careful to avoid a violent exotherm. The resulting yellowish mixture was stirred for 3 hours. At this point the reaction was quenched with ice water. The mixture was diluted with dichloromethane and transferred to a separatory funnel. The organic layer was washed with a saturated solution of sodium bicarbonate, brine and then dried over magnesium sulfate. Filtration and concentration of the filtrate under reduced pressure provided a crude yellow oil. The oil was suspended in anhydrous methanol (100 mL) and sodium metal was added to the mixture until a pH of 9 was obtained. The mixture was stirred for 3 hours. The volume was reduced and then diluted with ethyl acetate. The solution was transferred to a separatory flannel and washed with aqueous 0.05 N hydrochloric acid, brine and dried over magnesium sulfate. The solution was concentrated under reduced pressure to give a crude yellow oil with a mass of 5.88 g. Column chromatography [silica gel; eluent hexanes-ethyl acetate (3:2)] provided the desired product (2.69 g, 57%). 1H (CDCl3) δ(ppm): 2.65 (t, 2H); 2.81 (t, 2H); 3.19 (t, 2H); 3.6 (s, 3H); 3.75 (t, 2H); 7.22 (d, 2H); 7.81 (d, 2H). 13C (CDCl3) δ(ppm): 27.76, 33.03, 38.66, 51.52, 62.68, 127.97, 128.99, 134.47, 144.78, 173.21, 197.64.

1. customAt this point the reaction was quenched with ice water
2. additionThe mixture was diluted with dichloromethane
3. customtransferred to a separatory funnel
4. washThe organic layer was washed with a saturated solution of sodium bicarbonate, brine
5. dry with materialdried over magnesium sulfate
6. filtrationFiltration and concentration of the filtrate under reduced pressure
7. customprovided a crude yellow oil
8. customwas obtained
9. stirringThe mixture was stirred for 3 hours
10. washwashed with aqueous 0.05 N hydrochloric acid, brine
11. dry with materialdried over magnesium sulfate
12. concentrationThe solution was concentrated under reduced pressure
13. customto give a crude yellow oil with a mass of 5.88 g