反应详情

7.6 g (30.8 mmol) of ethyl 5-chloro-2,3-dimethyl-2,7-diazabicyclo[3.3.0]octane-7-carboxylate together with 30 ml of concentrated hydrochloric acid are refluxed overnight. The mixture is concentrated, the concentrate is taken up in 30 ml of water, this mixture is rendered alkaline using potassium carbonate and extracted five times using 50 ml portions of chloroform, and the extracts are dried over potassium carbonate, concentrated and distilled.

1. concentrationThe mixture is concentrated
2. extractionextracted five times
3. dry with materialthe extracts are dried over potassium carbonate
4. concentrationconcentrated
5. distillationdistilled