A formation of fused tricyclic [1,3]oxazino[3,4‐a]indol‐1‐ones and dihydropyrimido[1,6‐a]indol‐1(2H)‐ones via Rh(III)‐catalyzed [3+3] or [4+2] annulation of N‐methoxy‐1H‐indole‐1‐carboxamides with sulfoxonium ylides has been developed. These selective annulation reactions were carried out by switching the additives and notable features of this protocol were low catalyst loading and a broad substrate scope providing the corresponding products in up to 99% yields.

Rh(iii)-catalyzed coupling of phenylhydrazines with 1-alkynylcyclobutanols was realized through a hydrazine-directed C–H functionalization and [4+1] annulation pathway.

A novel Rh(III)-Catalyzed annulation of phthalazinones or pyridazinones with varied allenes was developed, leading to the formation of indazole derivatives bearing a quaternary carbon in moderate to good yields. The...

A rhodium(III)-catalyzed [4+1] spiroannulation of N-aryl phthalazine-diones (pyridazine-diones) with diazo compounds to construct spirocyclic indazole derivatives with diverse structures is described. The corresponding spiroannulation products were obtained in moderate to...