Domino Reactions That Combine an Azido-Schmidt Ring Expansion with the Diels−Alder Reaction

The combination of the intramolecular Schmidt reaction with the Diels−Alder reaction provides expedient access to a variety of heterocycles.
Two different modes of reaction planning are presented. In one, the azide and ketone moieties necessary for the intramolecular Schmidt
reaction originate on different molecules that are reacted and subsequently undergo a ring-adjustment step. Alternatively, an azido ketone can
be used provided the ketone is deactivated by its presence in an enone.