Ester as a blocking group for palladium-catalysed direct forced arylation at the unfavourable site of heteroaromatics: simple access to the less accessible regioisomers
A rhodium(iii)-catalyzed oxidative C–H/C–H cross-coupling of benzimidates with various heteroarenes has been devloped to directly furnish biheteroaryl-2-carbonitriles.