Tachrosin, 5,7-dimethoxy-8-( 2,3-dihydro-2,2-dimethyl-3-oxofuran-4-y1)flavone (1), was synthesised using the oxidative rearrangement of a 5-aryl-2-hydroxy-pent-4-en-3-one (2) with Tl(NO3)3 in methanol to a 4-aryl-5-methoxytetrahydrofuran-3-one (3) followed by elimination of the elements of methanol to form the dihydrofuranone ring.
S. Antus, L. Farkas, M. Nógrádi and P. Sohár, J. Chem. Soc., Chem. Commun., 1974, 799a DOI: 10.1039/C3974000799A
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