Metal-free C–H functionalization of 2H-imidazole 1-oxides with pyrrolyl fragments in the design of novel azaheterocyclic ensembles†
Abstract
The methodology of direct C(sp2)–H functionalization has for the first time been applied as an efficient and advanced approach to carry out C–H/C–H coupling of 2H-imidazole 1-oxides and pyrroles. The atom-economical method used does not require either any auxiliary group in the starting substrates, or catalysis by transition metals. As a result, a number of novel 1H-pyrrol-2-yl-2H-imidazoles, that are particularly of interest in the design of bioactive molecules, have been prepared under mild conditions and in good to excellent yields.