The reactions of 4‐hydroxy‐2‐pyrones with 2‐hydroxybenzaldehydes. A note of warning

P. De March, M. Moreno‐Mañas, J. L. Roca

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20 Citations (Scopus)

Abstract

The reaction between 2‐hydroxybenzaldehyde and 4‐hydroxy‐6‐methyl‐2‐pyrone (triacetic acid lactone) affords 3‐acetoacetyl‐2‐chromenone, 7, instead of 3‐(2‐hydroxybenzylidene)‐6‐methyl‐3,4‐dihydro‐2H‐pyran‐2,4‐dione, 6. The structures previously reported in the literature for the products formed in the reactions of 4‐hydroxy‐2‐chromenone with 2‐hydroxybenzaldehydes in a molar ratio 1:1 are considered erroneous. Thus, the previously reported 3‐(2‐hydroxybenzylidene)chroman‐2,4‐dione, 10, should be formulated as 3‐(2‐hydroxybenzoyl)‐2‐chromenone, 11. Copyright © 1984 Journal of Heterocyclic Chemistry
Original languageEnglish
Pages (from-to)1371-1372
JournalJournal of Heterocyclic Chemistry
Volume21
Issue number5
DOIs
Publication statusPublished - 1 Jan 1984

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