Preparation of gamma-pyrones

Details Preparation of gamma-pyrones Preparation of gamma-pyrones

C - Chemistry, Metallurgy

07

D

260/359.1

C07D 309/40 (2006.01) C07D 309/32 (2006.01)

Patent

CA 1095921

ABSTRACT OF THE DISCLOSURE Gamma-pyrones, particularly maltol (2-methyl-3-hydr- oxy-4H-pyran-4-one) and ethyl maltol (2-ethyl-3-hydroxy-4H- pyran-4-one) are prepared by hydrolyzing certain pyran inter- mediates prepared by reacting furfuryl alcohols, particularly 1(2-furyl)-1-ethanol, in aqueous solution with a halogen-con- taining oxidant. Novel 4-halo-dihydropyran intermediates and the preparation thereof are also disclosed.

279922

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