Convenient Synthesis of Quinoline‐4‐carboxylate Derivatives through the Bi(OTf)3‐Catalyzed Domino Cyclization/Esterification Reaction of Isatins with Enaminones in Alcohols

An efficient Bi(OTf)(3)-catalyzed method for the synthesis of quinoline-4-carboxylates through a domino cyclization/esterification reaction of isatins with enaminones in alcohols is reported. The salient features are the formation of the quinoline ring and an acyl-oxygen bond in one step, the use of readily available starting materials, and the wide substrate scope.