A General Method for the α-Acyloxylation of Carbonyl Compounds
摘要:
A simple, one-pot method for the alpha-acyloxylation of carbonyl compounds that proceeds at room temperature in the presence of both moisture and air has been developed. Treatment of a variety of aldehydes and both cyclic and acyclic ketones with N-methyl-O-benzoylhydroxylamine hydrochloride provides the alpha-functionalized product in 69-92% isolated yield. The transformation is tolerant of a wide range of functional groups and, significantly, is reglospecific in the discrimination of secondary over primary centers in the case of nonsymmetrical substrates.