2-Hydroxyphenyl arylalkyl and alkyl ketones have been cyclised in high yield to the corresponding isoflavones and chromones by treatment with BF3–Et2O and MeSO2Cl in HCONMe2.
R. J. Bass, J. Chem. Soc., Chem. Commun., 1976, 78 DOI: 10.1039/C39760000078
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