Enantioselective intermolecular iodoacetalization of enol ethers catalyzed by chiral Co(III)-complex-templated Brønsted acids

•Employing chiral Co(III)-complex-templated Brønsted acids as catalysts.•The asymmetric intermolecular iodoacetalization of enol ethers was achieved.•This method provided an easy access to optically active 3-iodoacetal derivatives.•High yield and up to 83:17 er.