反应详情

567 mg (3.6 mmol) of L-serine methyl ester hydrochloride are dissolved in 0.5 ml of water, and 610 mg (3.6 mmol) of ethyl benzimidate in 10 ml of dichloromethane are added thereto. After 48 h at reflux, the mixture is concentrated to a volume of 50 ml of dichloromethane and washed with NaHCO3 (3×10 ml), and the aqueous phase is extracted with ethyl acetate (2×10 ml). Column chromatography (15×5 cm, hexane/ethyl acetate 1:1) yields 3.0 g of A2a (91% of theory).

1. temperatureAfter 48 h at reflux
2. concentrationthe mixture is concentrated to a volume of 50 ml of dichloromethane
3. washwashed with NaHCO3 (3×10 ml)
4. extractionthe aqueous phase is extracted with ethyl acetate (2×10 ml)
5. customColumn chromatography (15×5 cm, hexane/ethyl acetate 1:1) yields 3.0 g of A2a (91% of theory)