A general and direct synthesis of polyhydroxy isoflavones (3-phenyl-4H-1-benzopyran-4-ones) starting from the corresponding unprotected phenols and arylacetic acids is described. The aryl rings may carry additional alkyl, methoxy and/or halogeno groups. Intermediate polyhydroxy deoxybenzoins (1,2-diphenylethanones) can also be isolated in good yield.
K. Wähälä and T. A. Hase, J. Chem. Soc., Perkin Trans. 1, 1991, 3005 DOI: 10.1039/P19910003005
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