Efficient Phenolic Oxidations to Construct ortho-Spirolactone Structures Using Oxo-Bridged Hypervalent Iodine(III) Compound
摘要:
The intramoleular ortho-spirocyclization of naphthols 1 bearing carboxylic acid moieties as internal nucleophiles using hypervalent iodine reagents is described. The use of the mu-oxo-bridged hypervalent iodine(III) compound is remarkably effective for this transformation, and spirolactones 2 were obtained in good to excellent yields using the mu-oxo-bis[trifluoroacetato(phenyl)iodine] 4 [PhI(OCOCF(3))O(OCOCF(3))IPh].
A high-performance enantioselective quaternary ammonium hypoiodite catalysis was developed for the dearomatization of arenols using oxone as an environmentally benign oxidant. The oxidation of not only 1- and 2-naphthols but also phenols, which were hardly reactive using the previous hypoiodite catalysis, readily proceeded under mild conditions, and only inorganic wastes were generated from the oxidant
IODOARENE DERIVATIVE, METHOD FOR PRODUCING OPTICALLY ACTIVE SPIROLACTONE COMPOUND USING SAME, AND METHOD FOR PRODUCING OPTICALLY ACTIVE CYCLIZATION ADDUCT
申请人:National University Corporation Nagoya University