Methods of manufacturing derivatives of beta-hydroxycarboxylic acids
First Claim
Patent Images
1. A method for preparing a β
- -hydroxycarboxylic acid ester comprising reacting a hydroxycarboxylic acid, or salt thereof, with an alcohol in the presence of an esterification catalyst and the absence of solvent other than the alcohol under substantially anhydrous conditions at atmospheric pressure and a temperature less than reflux temperature to produce the ester.
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Abstract
Preparation of derivatives of β-hydroxycarboxylic acid, including β-hydroxycarboxylic acid esters, α,β-unsaturated carboxylic acids, esters of α,β-unsaturated carboxylic acid, and alkoxy derivatives.
41 Citations
49 Claims
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1. A method for preparing a β
- -hydroxycarboxylic acid ester comprising reacting a hydroxycarboxylic acid, or salt thereof, with an alcohol in the presence of an esterification catalyst and the absence of solvent other than the alcohol under substantially anhydrous conditions at atmospheric pressure and a temperature less than reflux temperature to produce the ester.
- View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A process for preparing a β
- -hydroxycarboxylic acid ester comprising;
(a) providing a fermentation broth comprising a β
-hydroxycarboxylic acid, or salt thereof;
(b) forming a solution comprising the β
-hydroxycarboxylic acid, or salt thereof, from the fermentation broth; and
(c) reacting the β
-hydroxycarboxylic acid, or salt thereof, with an alcohol in the presence of an esterification catalyst and the absence of solvent other than the alcohol under substantially anhydrous conditions at atmospheric pressure and a temperature less than reflux temperature to produce the ester.
- -hydroxycarboxylic acid ester comprising;
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9. A method for preparing a β
- -hydroxycarboxylic acid ester comprising reacting a β
-hydroxycarboxylic acid with an alcohol containing between 1 and 7 carbon atoms, inclusive, in the presence of an esterification catalyst in a water-immiscible extractant to produce a reaction mixture comprising the ester and the extractant. - View Dependent Claims (10, 11, 12)
- -hydroxycarboxylic acid ester comprising reacting a β
-
13. A method for preparing a β
- -hydroxycarboxylic acid ester comprising;
(a) providing a fermentation broth comprising a β
-hydroxycarboxylic acid, or salt thereof;
(b) treating the broth with a water-immiscible extractant to form an extract comprising the β
-hydroxycarboxylic acid and the extractant;
(c) combining the extract with an alcohol containing between 1 and 7 carbon atoms, inclusive, and an esterification catalyst; and
(d) reacting the β
-hydroxycarboxylic acid with the alcohol in the presence of the extractant and the catalyst to produce the ester.
- -hydroxycarboxylic acid ester comprising;
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14. A method for preparing an α
- ,β
-unsaturated carboxylic acid, or salt thereof, comprising;
(a) providing an aqueous solution comprising a β
-hydroxycarboxylic acid salt; and
(b) heating the solution to dehydrate the salt and form an α
,β
-unsaturated carboxylic acid, or salt thereof. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22)
- ,β
-
23. A method for preparing an α
- ,β
-unsaturated carboxylic acid, or salt thereof, comprising;
(a) providing a fermentation broth comprising a β
-hydroxycarboxylic acid or salt thereof;
(b) forming an aqueous solution comprising the β
-hydroxycarboxylic acid, or salt thereof, from the fermentation broth; and
(c) heating the aqueous solution to dehydrate the β
-hydroxycarboxylic acid, or salt thereof, and form an α
,β
-unsaturated carboxylic acid, or salt thereof. - View Dependent Claims (24, 25, 26, 27)
- ,β
-
28. A method for preparing an α
- ,β
-unsaturated carboxylic acid, comprising;
(a) providing a fermentation broth comprising a β
-hydroxycarboxylic acid;
(b) forming a solution comprising the β
-hydroxycarboxylic acid from the fermentation broth; and
(c) vaporizing the solution in the presence of a dehydration catalyst to convert the β
-hydroxycarboxylic acid to an α
,β
-unsaturated carboxylic acid. - View Dependent Claims (29, 30, 31, 32, 33, 34, 35, 36)
- ,β
-
37. A method for preparing an α
- ,β
-unsaturated carboxylic acid ester comprising;
(a) providing an aqueous solution comprising a β
-hydroxycarboxylic acid or ester thereof, an alcohol, and a dehydration catalyst; and
(b) heating the solution to form the α
,β
-unsaturated carboxylic acid ester. - View Dependent Claims (38, 39, 40, 41, 42)
- ,β
-
43. A method of preparing an alkoxy derivative of a β
- -hydroxycarboxylic acid comprising;
(a) providing an aqueous solution comprising a β
-hydroxycarboxylic acid, or salt thereof, an alcohol, and a basic catalyst in a closed reactor; and
(b) heating the reactor to react the alcohol and the hydroxyl group of the β
-hydroxycarboxylic acid to form an alkoxy derivative of the β
-hydroxycarboxylic acid. - View Dependent Claims (44, 45, 46, 47, 48)
- -hydroxycarboxylic acid comprising;
-
49. A method for preparing an α
- ,β
-unsaturated carboxylic acid ester comprising heating a solution comprising a β
-hydroxycarboxylic acid, an alcohol containing between 1 and 7 carbon atoms, inclusive, and a water-immiscible solvent to form the α
,β
-unsaturated carboxylic acid ester.
- ,β
Specification