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A copper(I) catalyst promotes cycloisomerization in the synthesis of pentacyclic compounds, indicating potential efficiency in organic synthesis.
A protocol for the efficient and expeditious synthesis of the pentacyclic C2-spiropseudoindoxyl scaffold that relies on a copper(I)-catalyzed 6-endo-dig cycloaddition/internal redox (IR)/anthranil formation/oxaziridine formation/ring-opening spirocyclization/reduction cascade of 1H-indole N-tethered o-alkynylnitroarenes is described.
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Shang et al. (2025) studied this question.
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