L'action d'amines primaires (méthylamine, isopropylamine, benzylamine) en milieu neutre, sur des cinnamoyl‐3 pyrones‐2 s'effectue avec ouverture du cycle suivie d'une décarboxylation. La structure des amino‐7 dioxo‐3,5 octadiènes‐1,6 (2) ainsi obtenus a été déterminée par différentes méthodes: analyse élémentaire, spectrométrie de masse, rmn1H et 13C.
A new series, the N‐(methylene‐4‐oxocoumarinyl)aminoacids were synthesized by condensation of 4‐hydroxycoumarin with α‐aminoacids in the presence of excess ethyl orthoformate.
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