WO1998058898A1 - Use of an acid of mean strength as izomerisation catalyst of an epoxide with a carbonyl function in the epoxide alpha - Google Patents
Use of an acid of mean strength as izomerisation catalyst of an epoxide with a carbonyl function in the epoxide alpha Download PDFInfo
- Publication number
- WO1998058898A1 WO1998058898A1 PCT/FR1998/001331 FR9801331W WO9858898A1 WO 1998058898 A1 WO1998058898 A1 WO 1998058898A1 FR 9801331 W FR9801331 W FR 9801331W WO 9858898 A1 WO9858898 A1 WO 9858898A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- acid
- epoxide
- oxygen
- whose
- carbonyl function
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C67/00—Preparation of carboxylic acid esters
- C07C67/30—Preparation of carboxylic acid esters by modifying the acid moiety of the ester, such modification not being an introduction of an ester group
- C07C67/31—Preparation of carboxylic acid esters by modifying the acid moiety of the ester, such modification not being an introduction of an ester group by introduction of functional groups containing oxygen only in singly bound form
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C67/00—Preparation of carboxylic acid esters
- C07C67/30—Preparation of carboxylic acid esters by modifying the acid moiety of the ester, such modification not being an introduction of an ester group
- C07C67/333—Preparation of carboxylic acid esters by modifying the acid moiety of the ester, such modification not being an introduction of an ester group by isomerisation; by change of size of the carbon skeleton
Definitions
- the present invention relates to the use of medium strength acid to catalyze the isomerization of an epoxide having a carbonyl function in alpha of the epoxide. It relates more particularly to the isomerization of an alpha beta epoxide ester into an alpha hydroxylated ester having an ethylenic bond.
- the present invention relates in particular to the isomerization of the compounds of formula (I) below:
- R 1 may be hydrogen, hydroxylated, or even advantageously chosen from hydrocarbon groups (that is to say containing hydrogen and carbon), preferably from alkoxyls.
- R 1 advantageously has at most about 20 carbon atoms, preferably at most 10 carbon atoms, although this is not preferred, R 1 may be a branch of a resin; where R2, R3 and R4, similar or different, are chosen from hydrogen and hydrocarbon groups (that is to say containing hydrogen and carbon); for R2, R3 and R4 advantageously among the aryls and the alkyls, preferably among the alkyls [in the present description ALCO-y / e is taken in its etymological sense of hydrocarbon residue of an ALCO-O / after ignorance of the function alcohol (or ol)].
- the carbon carrying the epoxide and not linked to the carbonyl function carries two hydrocarbon radicals, advantageously aryl or alkyl.
- the compounds of formula (I) are generally subjected to isomerization to lead, on the one hand, to an alkyl function and, on the other hand, to an ethylenic function in the allylic position of the alcohol function.
- this reaction leads to numerous side reactions, among which mention may be made of the polymerization of the starting compound and of the ending compound. This polymerization is catalyzed by acids.
- benzene carrying an alkyl substituent such as, for example, toluene, xylene, trimethylbenzene and ethylbenzene.
- APTS paratoluenesulfonic acid
- Another object of the present invention is to provide a process which reduces the subsequent transposition of the desired product.
- Another object of the present invention is to provide a method of the above type allowing the use of inexpensive acid and easy to recover, recycle and destroy to avoid environmental problems.
- the quantity of acid used should be limited to a value advantageously at most equal to 10% by mass, preferably to 5% by mass relative to the reaction medium.
- Said weakly polar medium advantageously has a dielectric constant ⁇ (epsilon) at most equal to 10. To do this, it is necessary to choose weakly polar solvents.
- slightly polar solvent we mean a solvent whose dielectric constant [which changes little depending on the temperature, but which is advantageously measured around 20 ° C, for the dielectric constant values we can refer to the fourth edition of the work published by John WILEY and sons "TECHNIQUES OF CHEMISTRY; ORGANIC SOLVENTS, physical properties and methods of purification", by John A RIDDICK, William B. BUNGER, Théodore K. SAKANO] is at most equal to about 10 (constant relative dielectric ⁇ ). This value of ⁇ is valid for the main constituent of the solvent, but it is preferable that the whole solvent meets this constraint.
- the maximum value of ⁇ is at most equal to 10 (two significant figures), preferably to 5 (value of chlorobenzene).
- the main constituent of the solvent is not very basic, that is to say that its donor index or number donor is at most equal to about 20, preferably at most equal to 20 (two significant digits).
- the lower bound is not critical.
- the solvents can be mixtures, including petroleum fractions. Naturally, under the operating conditions the solvents must be inert with respect to the substrates and the reagents used.
- the preferred families of solvents are chosen from the group consisting of hydrocarbons, aromatic derivatives, ethers, esters and halogenated solvents.
- halogenated aliphatic derivatives dichloromethane, dichloro-1, 2-ethane, trichloro-1, 1, 1-ethane, as aromatic derivatives toluene and as halogenated aromatic derivatives chlorobenzene, as esters ethyl acetate and isopropyl acetate, as ethers, tert-butyl methyl oxide as well as anisole and heavy alcohols, that is to say meeting the constraints d 'immiscibility as specified above.
- the solvent is distillable under atmospheric pressure or under primary or secondary vacuum.
- said slightly polar solvent is chosen from solvents of aromatic character, that is to say from solvents which have at least one aromatic nucleus.
- This aromatic ring can either be present in a minor or major constituent of the solvent, or, when the solvent consists of a single compound, be present in this compound.
- the solvent should be chosen so that its melting point is lower than the temperature at which the reaction is to take place.
- the slightly polar solvent is a solvent chosen from aliphatic and / or aromatic carbides of halogenated aromatic derivatives, esters, phenol ethers and their mixtures.
- said slightly polar medium advantageously comprises at least one aromatic solvent, advantageously whose boiling point (under atmospheric pressure) is between 70 and 150 ° C.
- an acid of medium strength is an acid whose pKa (measured in water) is greater than zero and at most equal to approximately 7.
- the pKa (measured in aqueous medium) is at most equal to 5, advantageously to 3.
- the pKa (measured in aqueous medium) the acid used in free form (alone) is advantageously between zero and 3.
- the carboxylic acids are not desirable and have a catalytic power of low to very low.
- a basic compound is used together with the acid. This then makes it possible to use a wider spectrum of pKa and in particular to use strong acids (aryl- or alkyl sulfonic pKa at most equal to zero), (a minimum solubility is also required see above).
- strong acids aryl- or alkyl sulfonic pKa at most equal to zero
- sulfonic or phosphorous acids advantageously have at least 5 carbon atoms.
- the basic compounds giving salts are advantageously chosen from medium bases, in particular amines and advantageously tertiary phosphines; the preferred bases are, however, the bases whose basicity is linked to the presence of a pyridine ring (for example quinolines, picolines, pyridine stricto sensu, etc.) in the molecule.
- the number of carbon atoms in these bases is advantageously at least 5, in particular for reasons of solubility of the salt, and in general at most 30.
- the acid is a strong acid, it is preferable that it is introduced with a stoichiometric amount to form the salt with the above base, or a quasi-stoichiometric amount (between 1, 1 and 0.9 QS, of preferably between 1.05 and 0.95).
- the acid is a medium acid
- the values below are advantageous, but quantities can be easily used under stoichiometric.
- the medium strength acid is a salt of a strong acid with a base of sufficient strength to form a salt, generally a base of medium strength.
- said acid is an oxygenated acid, advantageously an acid of which at least one oxygen is engaged in a double bond (including donor acceptor bond).
- said acid is an oxygenated acid whose acidic hydrogen
- said acid is carried by an oxygen whose carrier atom is linked to more than one other oxygen. More specifically, said acid is an oxygenated acid, the acidic hydrogen of which is carried by an oxygen, the carrier atom of which is doubly linked to one oxygen and to at least one more oxygen.
- said acid comprises an amide function.
- said acid be an oxygenated acid, the acidic hydrogen of which is carried by an oxygen, the carrier atom of which is linked to a nitrogen atom.
- the nitrogen atom may be substituted although this is not preferred.
- said acid can be an oxygenated acid whose acid hydrogen is carried by an oxygen whose carrier atom is linked to a nitrogen atom to form an amide function (including anilide).
- said acid is a sulfamic acid optionally substituted on nitrogen.
- sulfamic acid is particularly suitable for this type of reaction; in fact it is slightly soluble but sparingly soluble in the reaction medium at the reaction temperature, but its solubility decreases when cold, which makes it possible to separate it from the reaction medium and to recover it.
- the carbonyl function is an ester function. It is also desirable for the carbon carrying the epoxide and not linked to the carbonyl function to be carrying two hydrocarbon radicals.
- the present invention further relates to the use of an acid as an isomerization catalyst of an epoxide having a carbonyl function in alpha of the epoxide where said acid is of medium strength and has at least some solubility in the benzene. In this case it is desirable that said carbonyl function is an ester function.
- the carbon carrying the epoxide and not linked to the carbonyl function carries two hydrocarbon radicals.
- the following nonlimiting examples illustrate the invention.
- Procedure 500 g of anhydrous toluene and x g of catalyst are loaded into a 2.5 I reactor. In certain cases, drying is carried out, using a Dean Stark, of toluene at reflux (oil around 140 ° C.). The distillation is stopped when no more water comes out.
- the mixture is left to stir for 10 minutes at 70/80 ° C., and the stirring is stopped; the mixture is left to settle for 10 minutes.
- This neutralization is carried out for all the tests except for the test of Example 2 which will then be the subject of the stability tests.
- the upper organic layer and the aqueous layer are weighed, and the organic layer containing the EHMB is assayed by the analysis laboratory. We finally calculate the isomerization yield.
- the loss of EHMB corresponds, according to the results, to a decomposition in ketoester and heavy.
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP98933703A EP0993434A1 (en) | 1997-06-24 | 1998-06-24 | Use of an acid of mean strength as izomerisation catalyst of an epoxide with a carbonyl function in the epoxide alpha |
JP50391599A JP2002504920A (en) | 1997-06-24 | 1998-06-24 | Use of medium-strength acids as catalysts for isomerization of epoxides containing a carbonyl function at the α-position to the epoxide. |
AU83431/98A AU8343198A (en) | 1997-06-24 | 1998-06-24 | Use of an acid of mean strength as izomerisation catalyst of an epoxide with a carbonyl function in the epoxide alpha |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR97/07873 | 1997-06-24 | ||
FR9707873A FR2764885B1 (en) | 1997-06-24 | 1997-06-24 | USE OF MEDIUM STRENGTH ACID AS A CATALYST FOR ISOMERIZATION OF AN EPOXIDE HAVING A CARBONYL FUNCTION IN ALPHA OF THE EPOXIDE |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1998058898A1 true WO1998058898A1 (en) | 1998-12-30 |
Family
ID=9508357
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR1998/001331 WO1998058898A1 (en) | 1997-06-24 | 1998-06-24 | Use of an acid of mean strength as izomerisation catalyst of an epoxide with a carbonyl function in the epoxide alpha |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP0993434A1 (en) |
JP (1) | JP2002504920A (en) |
CN (1) | CN1261343A (en) |
AU (1) | AU8343198A (en) |
FR (1) | FR2764885B1 (en) |
WO (1) | WO1998058898A1 (en) |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5793933A (en) * | 1980-12-03 | 1982-06-11 | Nisshin Flour Milling Co Ltd | Preparation of 2-hydroxy-3-butenoic acid derivative |
-
1997
- 1997-06-24 FR FR9707873A patent/FR2764885B1/en not_active Expired - Fee Related
-
1998
- 1998-06-24 AU AU83431/98A patent/AU8343198A/en not_active Abandoned
- 1998-06-24 WO PCT/FR1998/001331 patent/WO1998058898A1/en not_active Application Discontinuation
- 1998-06-24 CN CN 98806584 patent/CN1261343A/en active Pending
- 1998-06-24 JP JP50391599A patent/JP2002504920A/en active Pending
- 1998-06-24 EP EP98933703A patent/EP0993434A1/en not_active Withdrawn
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5793933A (en) * | 1980-12-03 | 1982-06-11 | Nisshin Flour Milling Co Ltd | Preparation of 2-hydroxy-3-butenoic acid derivative |
Non-Patent Citations (2)
Title |
---|
DATABASE WPI Week 8229, Derwent World Patents Index; AN 82-60181e, XP002055560 * |
PETER YATES ET AL.: "Synthesis of piperazine-2,5-diones related to bicyclomycin:1,4-dibenzyl-3-hydroxy-3-(1-(2-methoxyethyl)ethenyl)piperazine-2,5-dione.2.Route via cyclic intermediates", CANADIAN JOURNAL OF CHEMISTRY., vol. 61, 1983, OTTAWA CA, pages 1397 - 1404, XP002055559 * |
Also Published As
Publication number | Publication date |
---|---|
FR2764885B1 (en) | 1999-09-10 |
AU8343198A (en) | 1999-01-04 |
EP0993434A1 (en) | 2000-04-19 |
FR2764885A1 (en) | 1998-12-24 |
CN1261343A (en) | 2000-07-26 |
JP2002504920A (en) | 2002-02-12 |
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