Preparation of 5-hydroxy-4-methyl-2(5h)-furanone

Details Preparation of 5-hydroxy-4-methyl-2(5h)-furanone Preparation of 5-hydroxy-4-methyl-2(5h)-furanone

C - Chemistry, Metallurgy

07

D

C07D 307/60 (2006.01)

Patent

CA 2172669

5-Hydroxy-4-methyl-2(5H)-furanone is prepared by cyclization of alkyl .beta.-formylcrotonates by heating with dilute aqueous hydrochloric acid or, advantageously, in the presence of dilute aqueous hydrochloric acid and catalytic amounts of methanol as solubilizer, subsequent workup of the reaction mixture by distillation and, where appropriate, isomerization of the 5-methoxy- or 5-ethoxy-4-methyl-2(5H)-furanone, which is formed as byproduct, by heating with dilute hydrochloric acid.

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