The functionalisation of heteroaromatic compounds by transition metal (TM) catalysed C–C bond formation complements classic condensation chemistry as a strategy for polyfunctional heteroaromatic synthesis. 1 Whereas classic heterocyclic synthesis frequently involves the preparation of appropriately substituted acyclic precursors which undergo cyclocondensation as a final step, TM-catalysed cross couplings offer the possibility of ...