Process for preparing 3-(hydroxymethyl)chromen-4-ones

C - Chemistry – Metallurgy – 07 – D

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C07D 311/22 (2006.01)

Patent

CA 2344664

3-(Hydroxymethyl)chromen-4-ones of formula (I) are described and a process for preparing said compounds. The process consists in reacting the compounds of general formula (II) wherein R is hydrogen, halogen, alkyl having 1 to 4 carbon atoms or alkoxy having 1 to 4 carbon atoms optionally substituted by phenyl or halogen, with formaldehyde and a basic catalyst followed by dehydration in an acid medium to form 3-(hydroxymethyl)chromen-4-ones of general formula (I), wherein R is as defined for (II).

La présente invention concerne, d'une part des 3-(hydroxyméthyle)chromène-4-ones représentés par la formule générale (I) et d'autre part l'élaboration de ces composés. A cet effet, on prend des composés représentés par la formule générale (II) où R est hydrogène, halogène, C1-C4 alkyle ou C1-C4 alcoxy éventuellement substitué par un phényle ou halogène, et on les met à réagir avec un formaldéhyde et un catalyseur basique, puis on le soumet à déshydratation dans un milieu acide jusqu'à former les 3-(hydroxyméthyle)chromène-4-ones représentés par la formule générale (I) où R est tel que défini pour la formule générale (II).

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