反应详情

A solution of 50.00 g of 1,5-pentanediol dissolved in 100 ml of dimethylformamide was added dropwise to a mixture of 23.00 g of sodium hydride (as a 55% w/w dispersion in mine al oil) in 300 ml of dimethylformamide, whilst ice-cooling at 5° to 7° C. The mixture was stirred at room temperature for one hour, after which 65.79 g of 2-methoxyethoxymethyl chloride dissolved in 100 ml of dimethylformamide were added dropwise, whilst ice-cooling at 5° to 7° C. The mixture was stirred at room temperature for 3 hours, after which it was poured into 2.5 liters of water and then extracted five times with methylene chloride. The combined extracts were washed with water, dried and concentrated by evaporation under reduced pressure. The residue was subjected to column chromatography through 850 g of silica gel and 48.40 g of the title compound were obtained from the fractions eluted with a mixtures of methylene chloride and methanol ranging from 98:2 to 95:5 by volume, as a colorless oil.

1. temperaturewhilst ice-cooling at 5° to 7° C
2. additionwere added dropwise, whilst ice-
3. temperaturecooling at 5° to 7° C
4. stirringThe mixture was stirred at room temperature for 3 hours
5. extractionextracted five times with methylene chloride
6. washThe combined extracts were washed with water
7. customdried
8. concentrationconcentrated by evaporation under reduced pressure