反应详情

温度

100 °C

Step B To a solution of 2-(4-hydroxy-tetrahydro-pyran-4-yl)-2-methyl-propionic acid ethyl ester (19.5 g, 90 mmol) in chloroform (100 mL) was added thionyl chloride (13.3 mL, 180 mmol) and dimethylformamide (0.28 mL). The reaction mixture was heated at 100° C. for 18 h, then cooled to room temperature and concentrated. To the resulting residue was added aqueous NaOH solution (10 N) to adjust the “pH” of the mixture to basic. The mixture was then extracted with ethyl acetate twice. The combined organic extracts were washed with water, brine, dried over MgSO4, and concentrated to give 2-(3,6-dihydro-2H-pyran-4-yl)-2-methyl-propionic acid ethyl ester as a brown oil (17.6 g, 99%).

1. temperaturecooled to room temperature
2. concentrationconcentrated
3. additionTo the resulting residue was added aqueous NaOH solution (10 N)
4. extractionThe mixture was then extracted with ethyl acetate twice
5. washThe combined organic extracts were washed with water, brine
6. dry with materialdried over MgSO4
7. concentrationconcentrated