Process for the preparation of 4-hydroxy-3-[2h] furanones

Details Process for the preparation of 4-hydroxy-3-[2h] furanones Process for the preparation of 4-hydroxy-3-[2h] furanones

C - Chemistry, Metallurgy

07

D

C07D 307/58 (2006.01) C07D 307/60 (2006.01)

Patent

CA 2077965

The invention is directed to a process for the preparation of 5-alkyl-4-hydroxy-3[2H]furanones and/or 2,5-dialkyl-4-hydroxy- 3[2H]furanones, wherein each alkyl group independently has one to six carbon atoms, comprising; (a) saponification of an ester selected from the group of 3,4-dihydroxyfurans substituted at the 2- and/or 5-position with one or two carbalkoxy groups, wherein each alkoxy group independently contains one to six carbon atoms, and optionally substituted at the 2- or 5-position with an alkyl group with one to six carbon atoms, or tautomeric forms or keto-enol isomers thereof,. (b) subsequent treatment with one or two alkylation reagents which independently may have one to six carbon atoms (c) subsequent recovery of the 5-alkyl-4-hydroxy- 3[2H]furanones and/or 2,5-dialkyl-4-hydroxy-3[2H]furanones.

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