untouched and suitable for further downstream functionalisation. Aryl halides bearing more sensitive functional groups were also viable coupling partners, with examples containing a sulfonamide, aldehyde, and benzylic alcohol remaining unreacted during the transformation, giving products 45, 46 and 47 in synthetically useful yields. While substitution in the meta-position of aryl halides had no effect on the reaction yield, with products 48 and 49 being formed in high yields, ortho-substitution proved deleterious, generating products only in very low yields or displaying no reactivity (see supporting information for details on incompatible aryl halide coupling partners). Exploring heterocyclic scaffolds, which are highly prevalent in APIs, we found that 2-, 3-and 4-bromo-pyridine isomers were suitable coupling partners, with the position of the bromide substituent relative to the pyridine nitrogen resulting in little difference to the final product yield (50-54). 2-Bromo-6-chloropyridine also reacted exclusively at the carbonbromide bond, with the chloride substituent remaining unfunctionalised under the reaction conditions (53).