task-specific ionic liquid via C(sp3)–O and C(sp2)–Obondcleavage of two different types of ethers for the assembly of structurally diverse 4-arylisoxazoles is described. Both the basic ionic liquid [C3NH2mim]Br and NHC–Pd catalyst IPr–Pd–Im–Cl2 played an important role in this transformation. Notably, this new approach provides a practical and straightforward route to access a broad range of privileged 4-arylisoxazole
A novel N‐heterocyclic carbene (NHC)‐palladium‐catalyzed three‐component cascade cyclization/alkynylation for the synthesis of structurally diverse 4‐alkynylisoxazoles was efficiently developed in ionic liquids. The operational simplicity, without additives, no additional ligands, and 0.5 mol % catalyst loading under air are some of the attractive features of this present protocol.