Rh( iii )-catalyzed C–H [4 + 2] annulation of oximes with (hetero)cyclic iodonium ylides to access pyrano[4,3- b ]pyridin-5-one derivatives

A Rh-catalyzed C–H [4 + 2] annulation of oximes with iodonium ylides is developed to synthesize pyrano[4,3- b ]pyridin-5-ones. This approach is suitable for various electronically diverse aryl oximes, vinyl oximes, and heterocyclic iodonium ylides.