Pd-Catalyzed Ortho-C−H Acylation/Cross Coupling of Aryl Ketone O-Methyl Oximes with Aldehydes Using tert-Butyl Hydroperoxide as Oxidant

A Pd-catalyzed protocol for direct C-H bond acylation by cross coupling of aryl ketone oximes and aldehydes using tert-butyl hydroperoxide (TBHP) as oxidant was developed. With oximes as a directing group for the C-H activation, the coupling with aldehydes was achieved with remarkable regioselectivity. The acylation reactions exhibit excellent functional group tolerance, and both aliphatic and heteroaromatic aldehydes can be effectively coupled to the oximes.