反应详情

A solution of hexahydro-5-oxo-1H-pyrrolizine 3-carboxylic acid ethyl ester (12.6 g, 0.064 mol) in ethanol (35 ml) is treated with a 2N sodium hydroxide solution (35 ml, 0.07 mol) with stirring for 72 hours. The solution is concentrated at reduced pressure and treated with concentrated hydrochloric acid (6 ml) dropwise. The solution is extracted with dichloromethane. The extracts are dried (MgSO4), filtered, and concentrated to yield an oil. Trituration of the oil with acetone yields hexahydro-5-oxo-1H-pyrrolizine 3-carboxylic acid as a white solid with mp 145°-148° C.

1. concentrationThe solution is concentrated at reduced pressure
2. additiontreated with concentrated hydrochloric acid (6 ml) dropwise
3. extractionThe solution is extracted with dichloromethane
4. dry with materialThe extracts are dried (MgSO4)
5. filtrationfiltered
6. concentrationconcentrated
7. customto yield an oil