Preparation of gamma-pyrones from 3-substituted furans

Details Preparation of gamma-pyrones from 3-substituted furans Preparation of gamma-pyrones from 3-substituted furans

C - Chemistry, Metallurgy

07

D

260/359.1

C07D 309/40 (2006.01)

Patent

CA 1109478

Abstract of the Disclosure Gamma-pyrones are prepared by contacting a 3-halo-furfuryl alcohol or a 3-alkoxy-furfuryl alcohol with one equivalent of a halogen, peracid or peroxide oxidant and then heating until hydrolysis of the formed 4-substituted-dihydropyran intermediate is substantially complete. Maltol (2-methyl-3-hydroxy-4H-pyran- 4-one) is prepared by this process from 2-(1-hydroxyethyl)-3- alkoxy furans or 2-(1-hydroxyethyl)-3-halo-furans. Gamma-pyrones are also prepared by contacting the corresponding 3-substituted- 2,5-dialkoxy-furfuryl alcohols with acid until conversion to the gamma-pyrones is substantially complete.

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