Chemistry of Heterocyclic Compounds p. 497 - 502 (1992)
Update date:2022-08-05
Topics:
Pivovarenko, V. G.
Khilya, V. P.
A study was carried out on the reaction of α-substituted 2-hydroxyacetophenones eith the mixed anhydride of acetic and formic acids in the presence of bases of different strength.Chromones containing a conjugated electron-withdrawing substituent at C(3) are formed in close to quantitative yield in the presence of triethylamine.The preparation of chromones containing an unconjugated substituent under these conditions is recommended only for 5-hydroxychromones.
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