Preparation of gamma-pyrones

Details Preparation of gamma-pyrones Preparation of gamma-pyrones

C - Chemistry, Metallurgy

07

D

260/359.1

C07D 309/38 (2006.01) A23L 1/226 (2006.01) C07D 307/32 (2006.01) C07D 307/60 (2006.01) C07D 309/32 (2006.01) C07D 309/40 (2006.01) C07D 493/04 (2006.01) C11B 9/00 (2006.01)

Patent

CA 1077501

ABSTRACT OF THE DISCLOSURE Gamma-pyrones of the formula Image where R is lower alkyl of 1 to 6 carbon atoms, lower alkenyl of 2 to 6 carbon atoms or benzyl are prepared from the corresponding Image where R' is C1-6 alkyl. Such an intermediate may be prepared from furfural via (a) the corresponding 1-(2-furyl)-1-alkanol, (b) 2-(1-hydroxy alkyl)2,5-dialkoxy, 2,5-dihydrofuran, and (c) the corresponding 2-alkyl-2H-pyran-3-(6H). The process is of particular use for preparing maltol, pyromeconic acid and ethyl maltol. Certain of the intermediate and reactions for producing the inter- mediates are novel.

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