Process for the preparation of 4-hydroxy-3[2H]furanones
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United States of America Patent
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May 2, 1995
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app pub date -
Dec 8, 1993
filing date -
Sep 10, 1991
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Abstract
A process is provided 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 carbons, comprising (a) saponifying 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) treating with one or two alkylation reagents which independently may have one to six carbon atoms, and (c) subsequently recovering the 5-alkyl-4-hydroxy-3[2H]furanones and/or 2,5-dialkyl-4-hydroxy-3[2H]furanones.
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