An efficient synthesis of 6-allyl-7-hydroxycoumarin, a key intermediate for the preparation of linear coumarins, is described via a regioselective catalysed ortho-Claisen rearrangement of methyl 4′-allyloxy-2′-methoxycinnamate.
N. Cairns, L. M. Harwood, D. P. Astles and A. Orr, J. Chem. Soc., Chem. Commun., 1986, 182 DOI: 10.1039/C39860000182
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