Regioselective copper-catalyzed N(1)-(hetero)arylation of protected histidine?

Organic & Biomolecular Chemistry Pub Date: 2016-09-05 DOI: 10.1039/C6OB01753C

Abstract

We report regioselective N(1)-arylation of protected histidine using copper(I) iodide as a catalyst, trans-N,N′-dimethylcyclohexane-1,2-diamine as a ligand and readily available aryl iodides as coupling partners under microwave irradiation at 130 °C for 40 min. The reaction provides rapid access to electron-donating, electron-withdrawing and bulky group substituted N-arylated histidines in high yields, including previously inaccessible N-heteroaryl histidines. These N(1)-(hetero)aryl histidines are promising building blocks in peptide-based drug design and discovery.

Graphical abstract: Regioselective copper-catalyzed N(1)-(hetero)arylation of protected histidine
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