Oxidation of o-hydroxyphenyl alkyl ketones with Phl(OAc)2/KOH–MeOH leads to 2,2-dimethoxycoumaran-3-ones which in the case of o-hydroxy-α-phenylpropiophenone offers a convenient route to aurone and isoaurone.
R. M. Moriarty, O. Prakash, I. Prakash and H. A. Musallam, J. Chem. Soc., Chem. Commun., 1984, 1342 DOI: 10.1039/C39840001342
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