EP1284955A1 - Verfahren zur herstellung von acyloxyacetaldehyden - Google Patents
Verfahren zur herstellung von acyloxyacetaldehydenInfo
- Publication number
- EP1284955A1 EP1284955A1 EP01943323A EP01943323A EP1284955A1 EP 1284955 A1 EP1284955 A1 EP 1284955A1 EP 01943323 A EP01943323 A EP 01943323A EP 01943323 A EP01943323 A EP 01943323A EP 1284955 A1 EP1284955 A1 EP 1284955A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- formula
- compound
- radical
- alkyl
- acetal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C67/00—Preparation of carboxylic acid esters
- C07C67/10—Preparation of carboxylic acid esters by reacting carboxylic acids or symmetrical anhydrides with ester groups or with a carbon-halogen bond
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C67/00—Preparation of carboxylic acid esters
- C07C67/10—Preparation of carboxylic acid esters by reacting carboxylic acids or symmetrical anhydrides with ester groups or with a carbon-halogen bond
- C07C67/11—Preparation of carboxylic acid esters by reacting carboxylic acids or symmetrical anhydrides with ester groups or with a carbon-halogen bond being mineral ester groups
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C67/00—Preparation of carboxylic acid esters
- C07C67/28—Preparation of carboxylic acid esters by modifying the hydroxylic moiety of the ester, such modification not being an introduction of an ester group
- C07C67/29—Preparation of carboxylic acid esters by modifying the hydroxylic moiety of the ester, such modification not being an introduction of an ester group by introduction of oxygen-containing functional groups
Definitions
- the invention relates to a process for the preparation of acyloxyacetaldehydes from the corresponding carboxylates via the diacetals with subsequent acetal cleavage.
- Acyloxyacetaldehydes are valuable starting materials in organic synthesis. For example, they are used as a starting material for the production of synthetic nucleosides with non-natural, heteroatom-containing carbohydrate units, such as 1,3-oxathiolanes with antiviral properties.
- alkene diol dialkylate such as butene-1,4-diol dibutyrate.
- alkene diol dialkylates are first obtained by reacting an alkenediol with an acid chloride ,
- WO 00/09494 proposes the reduction of a glyoxal monodialkyl acetal with NaBH 4 and subsequent reaction of the dialkyl acetal alcohol thus obtained with an acyl chloride.
- the desired acyloxyacetaldehydes can also be prepared starting from solketal (glycerol dimethyl ketal) by reaction with an acyl chloride and subsequent cleavage, and reduction with NalO 4 or by reaction of ethane-1,2-diol with an acyl chloride and subsequent oxidation ,
- the disadvantages of the previously known production variants are due, among other things, to the use of critical oxidizing agents, such as periodate, etc., to carrying out the reaction in a complicated or complex manner and / or to the difficult-to-access or expensive starting materials.
- the object of the invention was to find a new process for the preparation of acyloxyacetaldehydes which starts from easily accessible starting materials and leads to the desired end product in a few simple steps.
- the invention accordingly relates to a process for the preparation of acyloxyacetaldehydes of the formula
- R can mean an optionally mono- or polysubstituted alkyl, aryl, heteroaryl, alkaryl, alkylheteroaryl or aralkyl radical or an optionally mono- or polysubstituted heterocycle or alkyl heterocycle, which is characterized in that a compound of the formula
- R is as defined above and M can be an alkali or an alkaline earth atom, in a suitable solvent with a compound of the formula
- Ri and R 2 independently of Ri and R 2 represent an alkyl CiC ⁇ or together a C2-C6 alkylene radical and X represents a halogen atom to give the corresponding dialkyl acetal of the formula in which R, Ri and R 2 are as defined above, whereupon an acetal cleavage to the desired acyloxyacetaldehyde of the formula (I) is carried out.
- acyloxyacetaldehydes of the formula (I) are prepared.
- R denotes an optionally mono- or polysubstituted alkyl, aryl, heteroaryl, alkaryl, alkylheteroaryl or aralkyl radical or an optionally mono- or polysubstituted radical. substituted heterocycle or alkyl heterocycle.
- Alkyl is to be understood as meaning saturated or mono- or polyunsaturated, linear, branched or cyclic, primary, secondary or tertiary hydrocarbon radicals. These are preferably C 1 -C 2 -alkyl radicals, such as methyl, ethyl, propyl, isopropyl, butyl, isobutyl, t-butyl, pentyl, cyclopentyl, isopentyl, neopentyl, hexyl, iso-hexyl , Cyclohexyl, cyclohexylmethyl, 3-methylpentyl, 2,2-dimethylbutyl, 2,3-dimethylbutyl, octyl, cyclooctyl, decyl, cyclodecyl, dodecyl, cyclododecyl, etc.
- C 1 -C 2 -alkyl radicals such as methyl, ethy
- the alkyl group can optionally be substituted one or more times.
- Suitable substituents are OH, carboxylic acid derivatives, such as carboxylic acid esters or carboxylic acid amides, amino, alkylamino, preferably C 1 -C 6 -alkylamino, arylamino, preferably C 6 -C 2 o-arylamino, alkoxy, preferably C 1 -C 6 -alkoxy, aryloxy, preferably C 6 -C 2 o-aryloxy, nitro, cyano, sulfonic acid esters, solfonamides, sulfates, phosphates or phosphonates, either unprotected or protected, as described, for example, in Protective Groups in Organic Synthesis, (1991).
- Aryl is preferably understood to mean C 6 ⁇ C 2 o-aryl groups, such as phenyl, biphenyl, naphthyl, indenyl, fluorenyl, etc
- the aryl group can optionally be substituted one or more times.
- Suitable substituents are again OH, carboxylic acid derivatives, such as carboxylic acid esters or carboxamides, amino, alkylamino, preferably CrC- 6 -alkylamino, arylamino, preferably C 6 -C 2 o-arylamino, alkoxy, preferably Ci-Ce alkoxy, aryloxy, preferably C.
- Alkaryl or alkylaryl are to be understood as meaning alkyl groups, some of them
- Aralkyl or arylalkyl refers to an aryl group with an alkyl substituent.
- Heteroaryl or heterocycle are to be understood as cyclic radicals which contain at least one S, O or N atom in the ring. These are, for example, furyl, pyridyl, pyrimidyl, thienyl, isothiazolyl, imidazolyl, tetrazolyl, pyrazinyl, benzofuranyl, benzothiophenyl, quinolyl, isoquinolyl, benzothienyl, isobenzofuryl, pyrazolyl, indolyl, isoindolyl, benzoimidolylazolyl, benzoimidolylazolyl , 1, 2,4-thiadiazolyl, isoxazolyl, pyrrolyl, quinazolinyl, pyridazinyl, phthalazinyi, etc.
- heteroaryl group or the heterocycle can optionally be substituted one or more times by the substituents already mentioned above.
- Alkyl heteroaryl or alkyl heterocycle is understood to mean alkyl groups which are substituted by a heteroaryl group or by a heterocycle.
- R particularly preferably denotes a saturated, linear or branched C 2 -C 8 -alkyl radical, a benzyl or a phenyl radical, the radicals optionally one or more times by OH, carboxylic acid derivatives, such as carboxylic acid esters or carboxamides, amino, C 1 -C 6 -alkylamino, C 6 -C 2 o-arylamino, C 1 -C 6 alkoxy, C 6 - C 2 o-aryloxy, nitro or Cyano, may be substituted.
- R very particularly preferably denotes a saturated, linear C 2 -C 8 -alkyl radical.
- a compound of the formula (II) is reacted according to the invention with a compound of the formula (II).
- R is as defined in formula (I) and M represents an alkali or an alkaline earth atom.
- Preferred alkali or an alkaline earth atom are Na, K, Ca, Mg.Cs. Na or K are particularly preferred.
- R 1 and R 2 independently of one another denote a Ci-C ⁇ -
- Alkyl radical preferably a -C 4 alkyl radical.
- the alkyl radical can be saturated, linear, branched or cyclic.
- Linear or branched alkyl radicals such as methyl, ethyl, propyl, i-propyl, butyl hexyl, are preferred.
- Methyl, ethyl and propyl are particularly preferred.
- R 1 and R 2 can also together represent a C 2 -C 6 alkylene radical, so that a cyclic acetal is formed.
- C 2 -C 6 alkylene radicals are ethylene, propylene,
- X in the formula (III) is halogen.
- X is preferably F, Cl or Br; particularly preferably Cl or Br.
- the compounds of the formula (II) and of the formula (III) are used in an equimolar amount or one of the two compounds in a molar excess.
- the compound of formula (II) is preferably used in a molar excess. 1.1 to 2 mol of the compound of the formula (II) are preferably used per mol of the compound of the formula (III). If necessary, larger surpluses can also be used.
- the reaction takes place in an organic solvent. Suitable solvents are in particular dipolar, aprotic solvents.
- the solvents preferably contain an amide function. Examples include pyrrolidones, such as 2-pyrrolidone, N-methylpyrrolidone, annides, such as formamide, methyl- or ethylformamide, dimethyl- or diethylformamide.
- the reaction temperature depends on the solvent used and on the starting materials and is between 10 and 300 ° C., preferably between 50 and 250 ° C. and particularly preferably between 80 and 220 ° C.
- the compound of the formula (IV) thus obtained is isolated from the reaction mixture.
- this can be done, for example, by extraction or distillation.
- dialkylacetal of the formula (IV) can then be fed to the second step of the process according to the invention, the acetal cleavage, without any further purification.
- the acetal cleavage is carried out by means of acid catalysis with inorganic or organic acid, or with Lewis acids, with acidic cation exchangers or in the presence of lanthanide catalysts.
- Acids such as sulfuric acid, p-toluenesulfonic acid, formic acid, acetic acid etc. are preferably suitable as catalysts for acid catalysis.
- Various compounds of cerium, lanthanum, ytterbium, samarium etc. are suitable as lanthanides. These are especially chlorides, sulfates and carboxylates.
- the acetal cleavage is preferably carried out under acidic catalysis. Formic acid or acetic acid are particularly preferably used for this purpose.
- the dialkyl acetal is cleaved and converted into the desired compound of formula (I).
- Water is used in at least an equimolar amount or in a slight molar excess based on the acetal. Larger molar excesses of water are also possible if desired, but this increases the risk of side reactions. An equimolar amount of water is preferably used.
- the reaction temperature is between 0 ° C and the boiling point of the reaction mixture, preferably between 10 and 70 ° C, particularly preferably between 15 and 50 ° C.
- any excess acid and the alkyl carboxylate which has been split off or formed are separated off after the reaction, for example by distillation or by means of a rotary evaporator.
- the process according to the invention gives the desired acyloxyacetaldehydes of the formula (I) in a simple manner, starting from easily accessible starting materials, in high yields and with high purity.
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT9462000 | 2000-05-31 | ||
AT0094600A AT410791B (de) | 2000-05-31 | 2000-05-31 | Verfahren zur herstellung von acyloxyacetaldehyden |
PCT/EP2001/005069 WO2001092199A1 (de) | 2000-05-31 | 2001-05-04 | Verfahren zur herstellung von acyloxyacetaldehyden |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1284955A1 true EP1284955A1 (de) | 2003-02-26 |
Family
ID=3683380
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01943323A Withdrawn EP1284955A1 (de) | 2000-05-31 | 2001-05-04 | Verfahren zur herstellung von acyloxyacetaldehyden |
Country Status (5)
Country | Link |
---|---|
US (1) | US20030149271A1 (de) |
EP (1) | EP1284955A1 (de) |
AT (1) | AT410791B (de) |
AU (1) | AU6592701A (de) |
WO (1) | WO2001092199A1 (de) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1461041A4 (de) * | 2001-12-14 | 2006-03-29 | Pharmasset Ltd | Herstellung von zur synthese antiviraler nukleoside geeigneten zwischenverbindungen |
JP4653966B2 (ja) * | 2004-04-19 | 2011-03-16 | ダイセル化学工業株式会社 | 2−ベンゾイルオキシアセトアルデヒド誘導体の製造法 |
FR2914920B1 (fr) * | 2007-04-11 | 2011-09-09 | Clariant Specialty Fine Chem F | Procede de deacetalisation d'alpha-aminoacetals. |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3644837A1 (de) * | 1986-12-23 | 1988-07-07 | Hoechst Ag | Verfahren zur herstellung von acyloxyacetaldehyden |
JPH0655686B2 (ja) * | 1988-08-30 | 1994-07-27 | 宇部興産株式会社 | p−ブロモフェノキシアセトアルデヒドジアルキルアセタール類の製造方法 |
-
2000
- 2000-05-31 AT AT0094600A patent/AT410791B/de not_active IP Right Cessation
-
2001
- 2001-05-04 AU AU65927/01A patent/AU6592701A/en not_active Abandoned
- 2001-05-04 US US10/296,380 patent/US20030149271A1/en not_active Abandoned
- 2001-05-04 EP EP01943323A patent/EP1284955A1/de not_active Withdrawn
- 2001-05-04 WO PCT/EP2001/005069 patent/WO2001092199A1/de not_active Application Discontinuation
Non-Patent Citations (1)
Title |
---|
See references of WO0192199A1 * |
Also Published As
Publication number | Publication date |
---|---|
US20030149271A1 (en) | 2003-08-07 |
AT410791B (de) | 2003-07-25 |
ATA9462000A (de) | 2002-12-15 |
AU6592701A (en) | 2001-12-11 |
WO2001092199A1 (de) | 2001-12-06 |
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RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: NIEDERHUMER, GERHARD Inventor name: RIEBEL, PETER Inventor name: BOESTEN, WILHELMUS, HUBERTUS, JOSEPH |
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