Simultaneously Electrogenerated Cycloaddition Partners for Regiospecific Inverse-Electron-Demand Diels−Alder Reactions: A Route for Polyfunctionalized 1,4-Benzoxazine Derivatives
2-alkylamino-1,4-benzoxazine derivatives is described. The reactions are regiospecific and diastereospecific in the case of heterocyclic annulation. This cascade sequence, wherein both cycloaddition partners are generated in situ, at room temperature, undermetal-freeconditions, allows the inverse-electron-demand Diels−Alder reaction of an o-iminoquinone diene and a secondary alkylenamine dienophile, two
Regiospecific Inverse-Electron-Demand Diels–Alder Reaction of Simultaneously Electrogenerated Diene and Dienophile: An Expeditious Route to Polyfunctionalized 1,4-Benzoxazine Derivatives