Abstract
AbstractThis study presents a synthesis of 4H‐[1,2,3]triazolo[1,5‐a]indol‐4‐ones. The key step in the synthesis of this new heterocyclic scaffold is an intramolecular cyclization via an unprecedented carbonylative C–H functionalization of 1‐(2‐bromoaryl)‐1,2,3‐triazoles. Isotopic labelling of the carbonyl carbon atom is possible using near stoichiometric amounts of 13CO. Additionally, an alternative pathway via carbonylative Sonogashira coupling followed by a two‐step, one‐pot azidation/cycloaddition is also investigated, giving rise to the same scaffold.magnified image
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