反应详情

A mixture of N-(carbobenzyloxy)-3-fluoroaniline (1.000 g, 4.08 mmol) in dry tetrahydrofuran (10 ml) is cooled with a dry ice/acetone bath to about -78° and then nbutyllithium (1.87 ml of a 1.6M mixture in hexanes, 2.91 mmol) is added. (R)-glycidyl butyrate (0.420 g or 0.413 ml, 2.91 mmol) is then added via syringe and the cooling bath allowed to dissipate overnight, with the reaction mixture reaching 20°-25°. The reaction mixture is quenched by the careful addition of saturated aqueous ammonium chloride, the entire mixture transferred to a separatory funnel with dichloromethane washings, and the mixture extracted with dichloromethane. The combined organic extracts are dried over sodium sulfate, filtered and concentrated under reduced pressure to give a concentrate which is purified by chromatography over silica gel, eluting with acetonitrile/chloroform (10/90) containing 1% methanol, to give the title compound.

1. temperatureis cooled with a dry ice/acetone bath to about -78°
2. customreaching 20°-25°
3. customThe reaction mixture is quenched by the careful addition of saturated aqueous ammonium chloride
4. customthe entire mixture transferred to a separatory funnel with dichloromethane washings
5. extractionthe mixture extracted with dichloromethane
6. dry with materialThe combined organic extracts are dried over sodium sulfate
7. filtrationfiltered
8. concentrationconcentrated under reduced pressure
9. customto give
10. concentrationa concentrate which
11. customis purified by chromatography over silica gel
12. washeluting with acetonitrile/chloroform (10/90)
13. additioncontaining 1% methanol