反应详情

15 g (55.5 mmol) of ethyl 2-(tetrahydropyran-2-yl)-3-oxa-2,7-diazabicyclo[3.3.0]octane-7-carboxylate are heated under reflux with 8.25 g (56 mmol) of 70% strength perchloric acid in 100 ml of ethanol for 30 minutes. 10.5 g (58 mmol) of 30 strength sodium methylate solution are added, the mixture is concentrated, the residue is taken up in water and the solution is saturated with K2CO3 and extracted with CHCl3. The extract is dried over K2CO3 and concentrated and the residue is distilled.

1. concentrationthe mixture is concentrated
2. extractionextracted with CHCl3
3. dry with materialThe extract is dried over K2CO3
4. concentrationconcentrated
5. distillationthe residue is distilled