EP2170794A1 - Verfahren zur herstellung von 2-hydroxy-acetalen und den dazu korrespondierenden 2-hydroxyalkanalen - Google Patents
Verfahren zur herstellung von 2-hydroxy-acetalen und den dazu korrespondierenden 2-hydroxyalkanalenInfo
- Publication number
- EP2170794A1 EP2170794A1 EP08774064A EP08774064A EP2170794A1 EP 2170794 A1 EP2170794 A1 EP 2170794A1 EP 08774064 A EP08774064 A EP 08774064A EP 08774064 A EP08774064 A EP 08774064A EP 2170794 A1 EP2170794 A1 EP 2170794A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- formula
- general formula
- branched
- hydroxyacetals
- unbranched
- 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- Withdrawn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
- C07C41/00—Preparation of ethers; Preparation of compounds having groups, groups or groups
- C07C41/48—Preparation of compounds having groups
- C07C41/50—Preparation of compounds having groups by reactions producing groups
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C43/00—Ethers; Compounds having groups, groups or groups
- C07C43/30—Compounds having groups
- C07C43/315—Compounds having groups containing oxygen atoms singly bound to carbon atoms not being acetal carbon atoms
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C45/00—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds
- C07C45/51—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by pyrolysis, rearrangement or decomposition
- C07C45/511—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by pyrolysis, rearrangement or decomposition involving transformation of singly bound oxygen functional groups to >C = O groups
- C07C45/515—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by pyrolysis, rearrangement or decomposition involving transformation of singly bound oxygen functional groups to >C = O groups the singly bound functional group being an acetalised, ketalised hemi-acetalised, or hemi-ketalised hydroxyl group
-
- 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
- C07C67/287—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 halogen; by substitution of halogen atoms by other halogen atoms
Definitions
- the invention relates to a novel process for the preparation of 2-hydroxyacetals and the corresponding 2-hydroxyalkanals 2-hydroxyalkanals and 2-hydroxyacetals, e.g. 2-Hydroxyhexanal- or its dimethyl acetal are important intermediates for the synthesis of pharmaceutical agents.
- 2-hydroxydimethyl acetals are generally obtained by reacting the corresponding ⁇ -haloaldehydes with methanol in the presence of sodium methoxide.
- p. 369 ff summarizes all Bishe ⁇ gen results for the preparation and reaction of ⁇ -Halogenaldehyden until 1988 together.
- the halogenating agent bromine or sulfuryl chloride
- the yields are typically between 30 and 50%.
- the reaction of the reaction product with Nat ⁇ ummethoxid in dry methanol leads to the hydroxyacetal in 40 - 70% yield after dest ⁇ lativer purification of the crude product.
- More recent synthetic routes produce ⁇ -hydroxyacetals by reacting aldehydes with a stoichiometric amount of iodine in an alkaline methanol solution (Zacuto, Tetrahedron LeU 2005, 46, 447-450). Furthermore, ⁇ -haloacetals can be converted into ⁇ -hydroxyacetals by conversion into the corresponding hemiacetal acetates and subsequent reaction with lithium methoxide in high dilution (Ghelfi, Tetrahedron 1994, 50, 7897-7902).
- the invention therefore provides a process for the preparation of 2-hydroxyacetals of the general formula (Ia)
- R 1 is hydrogen, a branched or unbranched C 1 -C 2 -alkyl radical, an electron-deficient C 5 -C 6 -aryl which is substituted or unsubstituted by halogen, a NO 2 -, -CN, -CF 3 , acyl groups or a branched or unbranched alkyl group - or
- R 2 is a branched or unbranched C r Cs-alkyl radical or both R 2 radicals are linked together directly or via a CrC 4 unit,
- R 1 has the meaning given for formula (Ia), with bromine to the corresponding dibromo adduct and subsequent reaction of this dibromo adduct with an alkoxide of the general formula (IQ)
- R 2 has the meaning given for formula (Ia) and
- M is lithium, sodium or potassium.
- the procedure is such that initially introducing the Enolverbmdung and cooled to 0 to 10 ° C, especially 3 to 7 0 C. Subsequently, the bromine is added so that the temperature of the reaction mixture between 0 to 10 0 C, in particular between 3 to 7 0 C is maintained.
- the total dosing time is usually between 0.5 and 3 hours, preferably at 2 hours. Subsequently, the reaction mixture can then be used directly in the next step without further work-up and purification.
- the next step is carried out so that between 1.5 and 4 equivalents, in particular between 2 and 3 equivalents of alkoxide, in particular sodium methylate in dry methanol (content of methanol in methanol 10 to 30 wt .-%, in particular 25 to 30 wt. -%) is introduced and is cooled to 10 0 C. then 1 equivalent of the dibromo adduct of Enolverbmdung of formula (II) is metered in such that the temperature of the reaction mixture from 10 to 30 0 C, in particular between 15 and 25 0 C C.
- the dosing times are between 0.5 and 4 hours, in particular between 1.5 and 2.5 hours.
- the metering is then nachger ⁇ hrt at 20 to 40 0 C for a further 0.5 to 2 hours and then distilled off at 50 to 60 0 C of the solvent used as a solvent, usually methanol, in vacuo.
- the solvent used as a solvent usually methanol, in vacuo.
- the product obtained by the erfmdungsge speciallyen process usually tn a purity of 94 to 96% (GC) in a yield of 80 to 90%, based on the Enolverbmdung used of the formula (II).
- the 2-hydroxyacetal prepared according to the invention can be further purified by means of vacuum distillation. If it is necessary to use the product in solution in the next step, the reaction mixture can be discharged after the metering into the alcoholate solution to boiling water and the as - A -
- Solvent-used alcohol usually methanol, are distilled off simultaneously.
- the aqueous phase can then be extracted with a suitable water-immiscible solvent such as toluene, chlorobenzene or xylene
- R 1 is preferably C 4 -alkyl or phenyl.
- R 1 can also be a C 5 -C 6 -aryl or heteroaryl radical which is substituted, for example, by a halogen, a -CN-, -NO 2 , - CF 3 , acyl or alkyl group, such as, for example, ethyl or iso-propyl be.
- unsubstituted aryl radicals such as phenyl, or branched and unbranched C 5 -C 2 alkyl radicals are possible.
- R 2 can em branched or unbranched C] -Ci 2 alkyl such as methylate, ethylate, propylate, iso-propylate, sec- or tert-butylate or Amylatrest be. Both R 2 radicals can also be linked to one another directly or via a C 1 -C 4 unit.
- R 2 is in particular a methyl or ethyl group and the compounds of general formula (Ia) thus em 2-hydroxy-dimethyl acetal or 2-hydroxy-diethyl acetal.
- the process according to the invention is carried out without the addition of a solvent.
- the 2-hydroxyacetals prepared according to the invention can readily be converted into the corresponding 2-hydroxyalkanals.
- the hydrolysis is carried out immediately after the preparation of the 2-hydroxyacetals by adding a 10% Zirtonen yarns to the Christsl ⁇ sung.
- the preparation of the corresponding 2-hydroxyalkanals from the erfmdungs according to obtained 2-hydroxyacetals is therefore also subject of this invention.
- the yields obtained by the process according to the invention significantly exceed the yields obtained by known processes. Furthermore, the purities achieved make a distillative purification of the product superfluous. Product losses that inevitably occur due to expensive purification and distillation of this sensitive product class can thus be advantageously avoided.
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102007028924A DE102007028924A1 (de) | 2007-06-22 | 2007-06-22 | Verfahren zur Herstellung von 2-Hydroxyacetalen und den dazu korrespondierenden 2-Hydroxyalkanalen |
| PCT/EP2008/057267 WO2009000649A1 (de) | 2007-06-22 | 2008-06-11 | Verfahren zur herstellung von 2-hydroxy-acetalen und den dazu korrespondierenden 2-hydroxyalkanalen |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP2170794A1 true EP2170794A1 (de) | 2010-04-07 |
Family
ID=39708815
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP08774064A Withdrawn EP2170794A1 (de) | 2007-06-22 | 2008-06-11 | Verfahren zur herstellung von 2-hydroxy-acetalen und den dazu korrespondierenden 2-hydroxyalkanalen |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US8143455B2 (de) |
| EP (1) | EP2170794A1 (de) |
| JP (1) | JP2010530859A (de) |
| DE (1) | DE102007028924A1 (de) |
| WO (1) | WO2009000649A1 (de) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2690084B1 (de) * | 2011-03-25 | 2017-04-19 | NOF Corporation | Verfahren zur herstellung einer hydroxylgruppenhaltigen acetalverbindung |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE531336C (de) * | 1929-02-19 | 1931-08-08 | Rhone Poulenc Sa | Verfahren zur Herstellung von ª‡-ª‰-Dihalogenaethylestern |
| CH576410A5 (de) * | 1973-06-29 | 1976-06-15 | Firmenich & Cie | |
| JPS51125208A (en) * | 1975-03-03 | 1976-11-01 | Sankyo Co Ltd | Carbon chain lengthening |
| JPS57144234A (en) * | 1981-03-03 | 1982-09-06 | Sagami Chem Res Center | 1-halophenyl-2-oxy-1-alkanone acetal |
| JPS63287739A (ja) * | 1987-05-19 | 1988-11-24 | Daicel Chem Ind Ltd | クロルアセタ−ル類の製造法 |
| JPH1017518A (ja) * | 1996-07-05 | 1998-01-20 | Nissan Chem Ind Ltd | 光学活性α−ヒドロキシケタール化合物の製造法 |
| AU1379200A (en) * | 1999-06-23 | 2001-01-31 | Solvias Ag | Production of optically active alpha-hydroxyacetals |
| UA79498C2 (en) * | 2002-09-05 | 2007-06-25 | Kissei Pharmaceutical | Intermediates for preparation of phenoxy-acetic derivates and processes of their preparation |
-
2007
- 2007-06-22 DE DE102007028924A patent/DE102007028924A1/de not_active Withdrawn
-
2008
- 2008-06-11 JP JP2010512641A patent/JP2010530859A/ja active Pending
- 2008-06-11 US US12/665,375 patent/US8143455B2/en not_active Expired - Fee Related
- 2008-06-11 EP EP08774064A patent/EP2170794A1/de not_active Withdrawn
- 2008-06-11 WO PCT/EP2008/057267 patent/WO2009000649A1/de not_active Ceased
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2009000649A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2009000649A1 (de) | 2008-12-31 |
| US8143455B2 (en) | 2012-03-27 |
| DE102007028924A1 (de) | 2008-12-24 |
| US20100280276A1 (en) | 2010-11-04 |
| JP2010530859A (ja) | 2010-09-16 |
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| AX | Request for extension of the european patent |
Extension state: AL BA MK RS |
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| RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: DOCKNER, MICHAEL Inventor name: MUELLER, THOMAS-NORBERT |
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| 17Q | First examination report despatched |
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| 18D | Application deemed to be withdrawn |
Effective date: 20120905 |