EP1423350A1 - Verfahren zur herstellung von oxo-cyclohexyl- oder oxo-cyclohexylenderivaten - Google Patents
Verfahren zur herstellung von oxo-cyclohexyl- oder oxo-cyclohexylenderivatenInfo
- Publication number
- EP1423350A1 EP1423350A1 EP02767362A EP02767362A EP1423350A1 EP 1423350 A1 EP1423350 A1 EP 1423350A1 EP 02767362 A EP02767362 A EP 02767362A EP 02767362 A EP02767362 A EP 02767362A EP 1423350 A1 EP1423350 A1 EP 1423350A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- radical
- graphite
- cell
- cathode
- divided
- 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- Withdrawn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
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B3/00—Electrolytic production of organic compounds
- C25B3/20—Processes
- C25B3/25—Reduction
Definitions
- the present invention relates to a process for the preparation of compounds of the general formula I or I '
- R 1 is an oxo-cyclohexyl radical which is optionally substituted by a hydroxyl radical, an alkoxy radical and / or alkyl radicals or an oxo-cyclohexenyl radical which is optionally substituted by a hydroxyl radical, an alkoxy radical and / or alkyl radicals
- the oxo groups in the form of an acetal, Ketons or enolethers can be present
- R 2 represents a hydroxyl group or a protective group which can be converted into a hydroxyl group by hydrolysis
- EP-A 0 005, 748 describes a further process for the partial reduction of an alkynediol, likewise with zinc / acetic acid.
- the disadvantage of the zinc / acetic acid method is the insufficient selectivity. Side reactions e.g. the formation of spiro compounds that cannot be converted into the desired secondary products in the further course of the synthesis can lead to significant losses in yield.
- EP-A-0 085 763 describes an electrochemical process for reducing alkynediols. Lead electrodes are electrolyzed in a basic solution in a divided electrolytic cell.
- the reaction conditions are not suitable for the present compounds, since decomposition reactions occur in the alkaline.
- alkoxy radicals with which the oxocyclohexyl radicals or oxocyclohexenyl radicals can be substituted are preferably C 1 -C 4 -alkoxy radicals.
- alkyl radicals with which the oxocyclohexyl radicals or oxocyclohexenyl radicals can be substituted are preferably C 1 -C 4 -alkyl radicals, particularly preferably methyl radicals.
- the oxo groups are in the acetal form, they are preferably derived from primary Ci to C ⁇ monoalkyl alcohols or diprimary Ci to C 6 dialkyl alcohols.
- the oxo group is in the form of an enol ether.
- these two oxygen atoms can also be connected to one another by a Ca. to C 4 alkylene unit which may be substituted by alkyl radicals.
- Suitable protective groups for R 2 which can be converted into a hydroxyl group by hydrolysis are functional groups which can be converted relatively easily into a hydroxyl group.
- Examples include ether groups such as benzyloxy and tert-butyloxy, silyl ether groups such as -O-Si (CH 3 ) 3 , -O-Si (CH 2 CH 3 ) 3 , -O-Si (i-propyl) 3 , -O-Si (CH 3 ) 2 (tert-butyl) and -O-Si (CH 3 ) 2 (n-hexyl), or substituted methyl ether groups, such as the ⁇ -alkoxyalkyl ether groups of the formulas:
- pyranyl ether groups such as the tetrahydropyranyloxy group and the 4-methyl-5, 6-dihydro-2H-pyranyloxy group.
- R 3 , R 4 and R 5 independently of one another are hydrogen or optionally substituted C 1 -C 4 -alkyl.
- alkyl radicals for R 3 and R 4 linear or branched C 1 -C 4 -Al yl chains may be mentioned, for example methyl, ethyl, n-propyl, 1-methylethyl, n-butyl, 1-methylpropyl, 2-methylpropyl, and 1, 1-dimethylethyl called.
- Preferred alkyl radicals are methyl and ethyl.
- the radicals R 3 and R 4 can also form a cycloheptyl or cyclohexyl ring together with the carbon atom to which they are attached.
- Linear or branched C 1 -C 4 -acyl chains for example formyl, acetyl, propionyl, isopropionyl, may be mentioned as substituents for R 5 .
- the preferred acyl group is acetyl.
- the compound of the formula Ia and the corresponding cis isomer hereinafter also briefly: “eis-Asta-C15-EN” or “trans-Asta-C15-EN”) from the compound of Prepare formula Ha (hereinafter also briefly: "Asta-C15-IN”).
- cathode materials are preferred as cathode materials.
- the following materials can also be used as the cathode: zinc, copper, silver, tin, stainless steel, all classic hydrogenation metals, in particular Co, Ni, Ru, Rh, Re, Pd, Pt, Os, Ir, and Cd.
- Ni, Co, Ag and Fe can be used as Raney metals, which may be caused by foreign metals such as Mo, Cr, Au, Mn, Hg, Sn or other elements of the periodic table, in particular S, Se, Te, Ge, Ga, P , Pb, As, Bi, or Sb can be doped.
- anode materials preferably graphite, lead dioxide, platinum, oxygen-generating DSA® anodes.
- the current densities are generally 100 to 10,000 A / m 2 , preferably 300 to 5000 A / m 2 .
- the process according to the invention is generally used at temperatures from -10 ° C. to the boiling point of the solvent used in each case, temperatures from 5 ° to 100 ° C., in particular 5 to 30 ° C., being preferred.
- the process according to the invention can be carried out at a pH of 2 to 9, preferably at a pH of 3 to 8, particularly preferably at 4 to 7.
- the type of cell type used, the shape and the arrangement of the electrodes have an influence, so that restrictions in principle must be observed in the following.
- Split cells with a plane-parallel electrode arrangement are preferably used, since the anolyte and catholyte must be separated from one another in order to be able to rule out in the process according to the invention that starting materials such as products undergo chemical side reactions as a result of the anode process.
- Ion exchange membranes, microporous membranes, diaphragms, filter fabrics made of non-electron-conducting materials, glass frits and porous ceramics can be used as separation media.
- Ion exchange membranes, in particular cation exchange membranes are preferably used. These conductive membranes are commercially available e.g. available under the trade names Nafion® (E.T. DuPont de Nemours and Company) and Gore Select® (W.L. Gore & Associates, Inc.).
- the electrodes are preferably arranged plane-parallel, since in this embodiment, with small electrode gaps, with two gaps of 0.01 to 10 mm each, preferably 0.01 to 3 mm in the anodic and / or cathodic gap, there is a homogeneous current distribution.
- the present method can also be carried out in undivided driving mode if the surface of the working electrode (in this case the cathode) and the counter electrodes (in this case the anode) differ greatly in size.
- the area of the anode is preferably reduced to values of 1 to 50% of the cathode area, further preferably to 3 to 30% and particularly preferably to 5 to 20%.
- Electrolysis cells consisting of a monopolar cathode, a monopolar and one or more bipolar electrodes in between are particularly preferred, wherein the cathode and the parts of the bipolar electrodes charged in the same direction together form the working electrode and the anode and the parts of the bipolar electrodes charged in the same direction together form the counter electrode
- the surface of the counter electrode consists of electrochemically active and inactive parts
- the sum of the electrochemically active parts of the surface of the counter electrode is many times smaller than that of the electrochemically active parts of the surface of the working electrode.
- the electrolysis cell is designed as a plate stack cell or a capillary gap cell.
- the material from which the anode (counter electrode) is made is generally selected from the following group: solid graphite, graphite cardboard, solid metal, solid graphite, coated on the electrolyte contact surface with a thin layer of metal foil, solid graphite, coated on the electrolyte contact surface with a cation or anion exchange membrane, which may be coated with a catalyst.
- the material from which the cathode is made is generally selected from the following group: solid graphite, graphite cardboard, solid metal, graphite felt plates, carbon felt plates, fabrics with a carbon-covered electrolyte contact surface, porous solids filled with carbon, porous metals, e.g. Metal sponges.
- the difference in surfaces can e.g. can be achieved by using a material with a large surface area per volume, such as graphite felt, for the large-area working electrode, while the counter electrode consists of solid material with a relatively small surface area per volume, such as graphite plates. Furthermore, the difference between the electrode surfaces can be created or increased by partially covering the counterelectrode with a non-conductive plastic film.
- the electrochemical process according to the invention can be carried out either continuously or batchwise.
- the electrochemical process according to the invention is carried out in the presence of an auxiliary electrolyte.
- the auxiliary electrolyte sometimes also serves to control the selectivity of the reaction. This is particularly important in the present case, since the compounds to be reacted show a strongly pH-dependent stability.
- the content of the auxiliary electrolyte is generally at a concentration of 0.1 to 10, preferably 0.2 to 3,% by weight, based in each case on the reaction mixture.
- Protonic acids such as organic acids, e.g. Sulfonic acids such as methylsulfonic acid, benzenesulfonic acid or toluenesulfonic acid, carboxylic acids such as benzoic acids, C ⁇ -C ⁇ -alkanoic acids, especially acetic acid, mineral acids such as sulfuric acid, hydrochloric, bromic and hydroiodic acids and phosphoric acid.
- Buffer solutions which can be prepared from the corresponding acids and their salts are particularly preferred; acetate buffers are particularly preferably used.
- Neutral salts can also be used as auxiliary electrolytes.
- Anions to be mentioned are: fluoride, tetrafluoroborate, sulfonates, such as e.g. Methyl sulfonate, benzenesulfonate, toluenesulfonate, sulfates such as e.g. Sulfate, methyl sulfate, ethyl sulfate, phosphates such as e.g. Methyl phosphate, dirnethyl phosphate, diphenyl phosphate, hexafluorophosphate, phosphonates, such as e.g.
- Methylphosphonate methyl ester and phenylphosphonate methyl ester but also the salts of the above-mentioned organic acids, e.g. Acetate or the halides chloride, bromide and iodide.
- the cations mentioned above can again be used as cations in these compounds.
- buffer systems is particularly preferred in order to obtain the highest possible stability of the starting materials to be reacted and their products.
- Phosphate buffers and acetate buffers and mixtures of acetate buffers are preferably used in combination with other conductive salts.
- protic solvents that is to say solvents which contain and can release protons and / or form hydrogen bonds, such as water, alcohols, amines, carboxylic acids, etc.
- aprotic polar solvents such as THF, 1,2-dirthethoxyethane are also suitable as solvents , Dioxane or mixtures of protic, aprotic and / or water in the process according to the invention.
- lower alcohols such as methanol, ethanol, isopropanol, n-propanol, n-butanol, sec-butanol, tert-butanol, ethers, such as, for example, diethyl ether, 1,2-dimethoxy, are preferably used.
- ethers such as, for example, diethyl ether, 1,2-dimethoxy.
- ethane, furan, THF, acetonitrile and dimethylformamide are used, preferably a mixture of these solvents or more preferably water in a mixture with these solvents in all possible mixing ratios.
- Alcohols their carboxylic acids or amides can also be used.
- the preferred carboxylic acids used are: formic acid, acetic acid, propionic acid 0 and longer-chain branched and unbranched carboxylic acids, and also sulfuric acid, hydrochloric, bromic and hydroiodic acids.
- a further advantage has proven to be the addition of a solvent which forms a two-phase mixture with the starting material to be used and the corresponding conducting salt with water.
- Suitable solvents are the solvents described above.
- Electrode was used as the cathode, and a mixture of 70.5 g of 1M sodium acetate buffer (pH 5) and 70.5 g of THF was used as the catholyte. 7.5 g of the compound of the formula Ha (hereinafter also abbreviated as "Asta-C15-IN”) were dissolved in the catholyte. The catholyte was two-phase.
- the two cell compartments were separated from each other by an ion exchange membrane (Nafion 324).
- ion exchange membrane Nafion 324.
- both cell compartments were filled and pumped around and the electrolysis was carried out at 25 ° C. and a current density of 14 mA / cm 2 . After an applied amount of charge of 2.5 F, the electrolysis was complete.
- test evaluation showed 33% ice-Asta-C15-EN and 11% trans-Asta-C15-EN, a total of 44% valuable product.
- the two cell compartments were separated from each other by an ion exchange membrane (Nafion 324).
- both cell compartments were filled and pumped around and the electrolysis was carried out at 25 ° C. and a current density of 14 mA / cm 2 . After an applied charge of 2.0 F, the electrolysis was complete.
- the test evaluation showed 12% eis-Asta-C15-EN (compound cis-Ia) and 28% trans-Asta-C15-EN (compound trans-Ia), a total of 40% valuable product.
- the two cell compartments were separated from each other by an ion exchange membrane (Nafion 324).
- ion exchange membrane Nafion 324.
- both cell compartments were filled and pumped over and the electrolysis was carried out at 20 25 ° C. and a current density of 14 mA / cm 2 . After an applied charge of 2.0 F, the electrolysis was complete.
- test evaluation showed 17% eis-Asta-C15-EN (cis-Ia) and 8% 25 trans-Asta-C15-EN (trans-Ia), a total of 25% valuable product.
- the two cell compartments were separated from each other by an ion exchange membrane (Nafion 324).
- both cell compartments were filled and pumped around and the electrolysis was carried out at 25 ° C. and a current density of 14 mA / cm 2 . After an applied charge of 4.5 F, the electrolysis is complete. 5
- the test evaluation showed 4% ice-Asta-C15-EN and 17% trans-Asta-C15-EN, in total 21% product of value.
- Electrode was used as the cathode, and a mixture of 70.5 g of 1M sodium acetate buffer (pH 5) and 70.5 g of THF was used as the catholyte. 7.5 g of Asta-C15-IN were dissolved in the catholyte.
- the catholyte has two phases. 200g of a 2% aqueous sulfuric acid solution, which was combined with a lead dioxide anode, served as the anolyte.
- the two cell compartments were separated from each other by an ion exchange membrane (Nafion 324).
- ion exchange membrane Nafion 324.
- both cell compartments were filled and pumped over and the electrolysis was carried out at 15 25 ° C. and a current density of 14 mA / cm 2 . After an applied charge of 2.0 F, the electrolysis is complete.
- test evaluation showed 48% ice-Asta-C15-EN and 9% trans-20 Asta-C15-EN, a total of 57% valuable product.
- Graphite was used as cathode and a mixture of 70.5 g IM sodium acetate buffer (pH 5) and 70.5 g THF as catholyte. 7.5 g of Asta-C15-IN (Ila) were dissolved in the catholyte 30.
- the catholyte has two phases. 200g of a 2% aqueous sulfuric acid solution, which was combined with a lead dioxide anode, served as the anolyte.
- test evaluation showed 14% eis-Asta-C15-EN (cis-IIa) and 16% trans-Asta-C15-EN (trans-IIa), in total 30% product of value.
- the two cell compartments were separated from each other by an ion exchange membrane (Nafion 324).
- ion exchange membrane Nafion 324.
- both cell compartments were filled and pumped around and the electrolysis was carried out at 25 ° C. and a current density of 14 mA / cm 2 . After an applied charge of 2.0 F, the electrolysis is complete.
- test evaluation showed 34% eis-Asta-C15-EN and 7% trans-Asta-C15-EN, a total of 41% valuable product.
- Graphite was used as the cathode, and a platinum wire was used as the anode.
- the electrolyte consists of a 9.5% solution of Asta-C15-In in 30g dioxane and 30g of an IM sodium acetate buffer pH5 in water.
- the electrolysis is carried out at 25 ° C. and a current density of 14 mA / cm 2 . After an applied amount of 3 F, the electrolysis is complete.
- test evaluation showed 12% eis-Asta-C15-EN and 18% trans-Asta-C15-EN, in total 30% product of value.
- Electrode was used as the cathode, and a mixture of 70.5 g of 0.1M sodium hydroxide solution (pH 13) and 70.5 g of dioxane was used as the catholyte. 7.5 g of the compound of the formula Ila were dissolved in the catholyte. A single-phase, homogeneous solution was obtained. 200g of a 0.1M aqueous sodium hydroxide solution, which was combined with a platinum anode, served as the anolyte.
- the two cell compartments were separated from each other by an ion exchange membrane (Nafion 324).
- ion exchange membrane Nafion 324.
- both cell compartments were filled and pumped over and the electrolysis was carried out at 25 ° C. and a current density of 10 mA / cm 2 . After an applied amount of charge of 2.0 F, the electrolysis is stopped.
- test evaluation did not reveal any valuable product - decomposition in an alkaline medium occurred.
- the two cell compartments were separated from each other by an ion exchange membrane (Nafion 417).
- ion exchange membrane Nafion 417.
- both cell compartments were filled and pumped over and the electrolysis was carried out at 25 ° C. and a current density of 5 mA / cm 2 . After an applied charge of 0.7 F, the electrolysis is stopped.
- the test evaluation showed 1% ice-Asta-C15-EN and 3% trans-Asta-C15-EN, and 4% Asta-C-15-IN as starting material.
- the main part of the Asta-C15-IN was converted into decomposition products.
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Electrolytic Production Of Non-Metals, Compounds, Apparatuses Therefor (AREA)
Abstract
Description
Claims
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10142220 | 2001-08-29 | ||
DE10142220A DE10142220A1 (de) | 2001-08-29 | 2001-08-29 | Verfahren zur Herstellung von Oxo-cyclohexyl- oder Oxo-cyclohexylenderivaten |
DE10143161 | 2001-09-04 | ||
DE10143161A DE10143161A1 (de) | 2001-09-04 | 2001-09-04 | Verfahren zur Herstellung von Oxo-cyclohexyl-oder Oxo-cyclohexylenderivaten |
PCT/EP2002/008986 WO2003020679A1 (de) | 2001-08-29 | 2002-08-10 | Verfahren zur herstellung von oxo-cyclohexyl- oder oxo-cyclohexylenderivaten |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1423350A1 true EP1423350A1 (de) | 2004-06-02 |
Family
ID=26010015
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02767362A Withdrawn EP1423350A1 (de) | 2001-08-29 | 2002-08-10 | Verfahren zur herstellung von oxo-cyclohexyl- oder oxo-cyclohexylenderivaten |
Country Status (5)
Country | Link |
---|---|
US (1) | US20040195108A1 (de) |
EP (1) | EP1423350A1 (de) |
CN (1) | CN1547565A (de) |
CA (1) | CA2458696A1 (de) |
WO (1) | WO2003020679A1 (de) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP4337809A1 (de) * | 2021-05-12 | 2024-03-20 | DSM IP Assets B.V. | Elektrochemische hydrierung spezifischer alkine |
DE102022133773A1 (de) * | 2022-12-16 | 2024-06-27 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung eingetragener Verein | Verfahren zur elektrokatalytischen Hydrierung von Alkinen und elektrochemische Zelle für dieses Verfahren |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ATE13666T1 (de) * | 1982-02-09 | 1985-06-15 | Hoffmann La Roche | Verfahren zur herstellung von cyclohexenderivaten. |
DE4322277A1 (de) * | 1993-07-05 | 1995-01-12 | Basf Ag | Verbessertes Verfahren zur Herstellung von Astaxanthin, neue Zwischenprodukte hierfür sowie ein Verfahren zu deren Herstellung |
DE19533773A1 (de) * | 1995-09-12 | 1997-03-13 | Basf Ag | Plattenstapelzelle |
DE10063195A1 (de) * | 2000-12-19 | 2002-06-20 | Basf Ag | Bipolare quasigeteilte Elektrolysezellen |
-
2002
- 2002-08-10 CA CA002458696A patent/CA2458696A1/en not_active Abandoned
- 2002-08-10 CN CNA028167678A patent/CN1547565A/zh active Pending
- 2002-08-10 US US10/486,201 patent/US20040195108A1/en not_active Abandoned
- 2002-08-10 WO PCT/EP2002/008986 patent/WO2003020679A1/de not_active Application Discontinuation
- 2002-08-10 EP EP02767362A patent/EP1423350A1/de not_active Withdrawn
Non-Patent Citations (1)
Title |
---|
See references of WO03020679A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2003020679A1 (de) | 2003-03-13 |
CN1547565A (zh) | 2004-11-17 |
US20040195108A1 (en) | 2004-10-07 |
CA2458696A1 (en) | 2003-03-13 |
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