Rh(III)‐Catalyzed C−H Activation/Annulation of N‐Methyl Arylhydrazines with Iodonium Ylides toward Ring‐fused Cinnolines

Abstract The first Rh(III)‐catalyzed annulation of N‐methyl arylhydrazines with iodonium ylides was developed. This transformation undergoes cascade C−H activation/annulation, dehydration and demethylative aromatization under very simple reaction conditions, providing a series of oxycycloalkyl‐fused cinnolines in good yields.