Three-membered heterocyclic rings, which can be converted into a large number of functional groups,[1] have been invaluable intermediates in organic synthesis. They are easily synthesized from the oxidation of alkenes (oxiranes)[2] or imines (oxaziridines)[3] with preservation of their configuration, and their rings are easily broken through addition reactions. Nitrogen centers functionalized with three different substituents are usually ...
![2-tert-butyl-1-oxa-2-azaspiro[2.5]octane Structure](https://image.chemsrc.com/caspic/279/17363-66-5.png)