4-Oxochromene-3-carbaldehyde derivatives react with 2-iodoethanol and potassium carbonate in acetone to produce tetrahydrofuro[2,3-b][1]benzopyran-4-ones.
P. J. Cremins and T. W. Wallace, J. Chem. Soc., Chem. Commun., 1984, 1698 DOI: 10.1039/C39840001698
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