TY - JOUR
T1 - The reactions of 4‐hydroxy‐2‐pyrones with 2‐hydroxybenzaldehydes. A note of warning
AU - De March, P.
AU - Moreno‐Mañas, M.
AU - Roca, J. L.
PY - 1984/1/1
Y1 - 1984/1/1
N2 - 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
AB - 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
U2 - 10.1002/jhet.5570210525
DO - 10.1002/jhet.5570210525
M3 - Article
VL - 21
SP - 1371
EP - 1372
JO - Journal of Heterocyclic Chemistry
JF - Journal of Heterocyclic Chemistry
SN - 0022-152X
IS - 5
ER -