Copper-catalysed site-selective arylation of pyrazoles

Article excerpt

Nature Chemistry, Published online: 12 June 2026; doi:10.1038/s41557-026-02148-z N-aryl pyrazole is a prevalent motif among pharmaceuticals across various therapeutic areas but can be challenging to synthesize due to the high similarity of the two nitrogen atoms. Now it has been shown that the use of copper catalysis and arynes provides a switchable protocol to access both regioisomers.