The catalytic reaction of ketoximes with aryliodides via a Beckmann rearrangement in the presence of a catalytic amount of Pd(OAc)2, Ag2O and ZnBr2 gave substituted phenanthridines in good to excellent yield. In the reaction, aromatic ketoximes converted first to acetanilides in the presence of ZnBr2/TFA via a Beckmann rearrangement followed by arylation in the presence of palladium complex. Furthermore
The palladium-catalysed direct arylation of acetanilides by using C-H activation methodology has been demonstrated. Several acetanilides were coupled with aryl iodides in the presence of 10 mol% of Pd(OAc)2, 1·0 equiv of Cu(OTf)2, and 0·6 equiv of Ag2O to afford the corresponding products in moderate to excellent yields. The results showed that the amount of Ag2O was important for this protocol.
An efficient novel protocol for the construction of an hyellazole-inspired compound collection is described. Starting from 2,6-diarylacetanilides, the desired products were obtained using hypervalent iodine promoted electrocyclization. The mechanism of product formation was investigated through intramolecular competition experiments.