反应详情

Boron trifluoride diethyl etherate (12.56 mL, 100 mmol) was added to a −78° C. solution of N-carbobenzoxy-dl-alanine (4.47 g, 20 mmol) and benzaldehyde dimethyl acetal (2.97 mL, 19.8 mmol) in diethyl ether (100 mL). After stirring at ambient temperature for 4 days, the reaction mixture was recooled to 0° C., quenched with saturated aqueous sodium bicarbonate and extracted with diethyl ether. The combined organic extracts were dried (sodium sulfate) and concentrated in vacuo. Chromatography over silica eluting with 5-45% ethyl acetate/hexane afforded benzyl 4-methyl-5-oxo-2-phenyl-1,3-oxazolidine-3-carboxylate.

1. customwas recooled to 0° C.
2. customquenched with saturated aqueous sodium bicarbonate
3. extractionextracted with diethyl ether
4. dry with materialThe combined organic extracts were dried (sodium sulfate)
5. concentrationconcentrated in vacuo