An efficient 4-to-5 ring expansion through aryne intermediates is disclosed. A wide variety of iodo-substituted benzo[b]furans are prepared from benzocyclobutenols via unusual oxyiodination of aryne intermediates. The great transformability of the resulting aryl iodides enables access to diverse highly functionalized benzo[b]furans.
Y. Hoshi and S. Yoshida, Chem. Commun., 2026, Accepted Manuscript , DOI: 10.1039/D6CC01989G
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