WO1997042358A1 - Procedimiento para la sintesis electroquimica de n-acetilcisteina a partir de cistina - Google Patents
Procedimiento para la sintesis electroquimica de n-acetilcisteina a partir de cistina Download PDFInfo
- Publication number
- WO1997042358A1 WO1997042358A1 PCT/ES1997/000113 ES9700113W WO9742358A1 WO 1997042358 A1 WO1997042358 A1 WO 1997042358A1 ES 9700113 W ES9700113 W ES 9700113W WO 9742358 A1 WO9742358 A1 WO 9742358A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- acetylcysteine
- solution
- cystine
- anode
- carried out
- Prior art date
Links
- 0 *C(CSSCC(C(O)=O)N)N Chemical compound *C(CSSCC(C(O)=O)N)N 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
- B01D61/42—Electrodialysis; Electro-osmosis ; Electro-ultrafiltration; Membrane capacitive deionization
- B01D61/44—Ion-selective electrodialysis
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C319/00—Preparation of thiols, sulfides, hydropolysulfides or polysulfides
- C07C319/02—Preparation of thiols, sulfides, hydropolysulfides or polysulfides of thiols
- C07C319/06—Preparation of thiols, sulfides, hydropolysulfides or polysulfides of thiols from sulfides, hydropolysulfides or polysulfides
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C319/00—Preparation of thiols, sulfides, hydropolysulfides or polysulfides
- C07C319/02—Preparation of thiols, sulfides, hydropolysulfides or polysulfides of thiols
- C07C319/12—Preparation of thiols, sulfides, hydropolysulfides or polysulfides of thiols by reactions not involving the formation of mercapto groups
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C319/00—Preparation of thiols, sulfides, hydropolysulfides or polysulfides
- C07C319/22—Preparation of thiols, sulfides, hydropolysulfides or polysulfides of hydropolysulfides or polysulfides
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
Definitions
- the present invention falls within the technical field of the production processes of N-acetylcysteine, which is a product with important applications in the pharmaceutical sector.
- the present invention provides a new method for the electrochemical synthesis of N-acetylcysteine which has clear advantages over conventional procedures, especially as regards product quality as well as environmental impact.
- N-acyl derivatives of cysteine in which the acyl group may be derived from a mono or dicarboxylic acid and, in particular, the mono-acrylated derivatives among which N-acetylcysteine is found, have therapeutic applications such as mucolytic (US Pat. 3,184,505 (1965)), in the treatment of corneal lesions (Bull. Mem. Soc. Fr. Opthalmol. 94,425 (1982)), as an antidote in overdose of aminocetophen (Review.Pharmacological and Biochemical Properties of Drug Substances, vol. 2. ME Goldberg. Ed. (An.Pharm. Assoc.Washington. DC, 1979), pp 479-488).
- the excess of non-transformed zinc metal has to be removed by forming the corresponding lead mercaptan, followed by isolation, treatment with hydrogen sulphide, removal of the formed sulfide, solution lyophilization and subsequent recrystallizations with solvents, to achieve a final yield of approximately 48% (MWPirie et al. Biohemical Journal 2, 614 (1931); MW Pirle et al. Ibid, 27, 1716 (1933); Smith, Gorin. J. Org. Chem. 26, (1961); and Greenstem. Chemistry of the Mino Ac ⁇ ds. Vol. 3. Ed Krieger. Florida 1984).
- the present invention refers to a new method for the electrochemical synthesis of N-acetylcysteine from cystine.
- the process of the present invention comprises a first phase of acetylation of the cystine of formula (III):
- reaction solution containing the bis-acetyl-L-cystine (IV) produced, alkali metal or aicalineoteric acetate, preferably sodium acetate, and 97/42358 PC ⁇ 7ES97 / 00113
- This solution is subjected to an electrochemical treatment of desalination and reduction that can be carried out sequentially or simultaneously, said electrochemical treatment being the object of the present invention.
- the solution containing (IV) is first subjected to a desalination process through the use of conventional, reverse or cascade electrodialysis, to obtain a solution that will have lost most of its saline content (alkaline acetate or alkaline earth). This solution is then subjected to an electrochemical reduction process. After completing this process, a solution of (I) with a low saline content is obtained, which can be optimally treated to isolate the desired product (I), with a quality capable of meeting the requirements of the American formacopea.
- the solution containing (IV) is subjected to a simultaneous electrochemical desalination and reduction process by means of a suitable electrochemical reactor.
- a solution containing (I) with a low salt content is obtained in a single electrochemical stage which, as before, can be optimally treated to separate the desired product, with the required quality.
- the solution is fed into the compartment labeled "dilution solution", while as “solution to concentrate” an aqueous solution of sodium acetate will be used.
- the “anodic reaction” and “cathodic reaction” will be formed by the same or different saline solutions, of dissociated acids or bases.
- a “cathode” a flat or three-dimensional electrode is used and made of a material selected from the following relationship: metals, conductive oxides or derivatives of carbonaceous or graphite compounds, gas diffusion cathode.
- the “anode” uses a stable electrode selected from: Ti-Pt, Ti-Pb, DSA oxygen, DSA chlorine, Pb0 2 , vitreous carbons, gas diffusion anode.
- the cathode and anode would not be limiting of the invention.
- the membranes used for electrodialysis will be a set of anionic and cationic membranes chosen from: Nafión, Neosepta, Asahi, Aqualytic or any other commercial. To operate the system, current densities between 1 and 1000 mA / cm 2 will be set, the current density may be constant or variable over time. After completing the electrodialysis process, a "concentrated solution" is obtained which has increased its content in alkali metal or alkaline earth metal acetate and a "diluted solution” is obtained containing IV and in which the content in said acetate has decreased. outright
- the electrodialysis operation can be carried out with the following composition of the solutions:
- Acetate of an alkaline or alkaline earth cation whose concentration range can vary between 0.01 M and the maximum concentration that allows its solubility in that medium, and N-acetylcystine in a concentration range of 0.01 to 4 M
- the pH can range between 2.5 and 10.
- Solution compartment to concentrate Any saline solution, preferably acetate of a alkaline or alkaline earth cation whose concentration range can range between 0.01 M and the maximum concentration that allows its solubility in that medium.
- the acetate is sodium acetate and its concentration is between 0.01 and 20 M.
- the solution containing IV called “diluted solution” is subjected to an electroreduction process in an electrochemical reactor or cell or electrosynthesis cell that will consist of at least one cathode and an anode, a catholyte and an anolyte separated by suitable separation means, such as an ion exchange membrane or any other appropriate separator.
- suitable separation means such as an ion exchange membrane or any other appropriate separator.
- electrodes consisting of graphite, carbon or its derivatives, tin lead, zinc, copper, platinized titanium, any steel or alloy in which iron, aluminum or its alloys with gallium, indium or thallium, diffusion cathodes of diffusion can be used gas, or preferably, a graphite electrode, carbon or its derivatives in three-dimensional form with a suitable current collector.
- anode a stable electrode selected from: Ti-Pt, Ti-Pb, DSA oxygen, DSA chlorine, Pb0 2 , vitreous carbons, graphite, gas diffusion anode is used without these electrodes being limiting of the invention.
- the electrosynthesis cell includes one or more anodes constituted by DSA-Oxygen, in order to avoid the corrosion problems detected in other types of anodes used and which could lead to a quality product with no counter pharmaceutical ⁇ tica (US Pharmacopeia).
- the catholyte, or solution in contact with the cathode will be formed by the solution coming from the EL ⁇ CTRODIALISIS ("diluted solution") and containing IV.
- the anolyte, or solution that is in contact with the anode may be formed by an aqueous solution of any saline electrolyte, for example, an aqueous solution of sodium sulfate.
- the catholyte and the anolyte must be necessarily separated by suitable separation means, such as an ion exchange membrane, preferably a selective membrane that allows the passage of cations but not of anions, or any other type of separator. These membranes will be chosen among the commercials Nafion, Neosepta, Sybron, lonic ⁇ , Aqualytic or any other commercial.
- the electrodes can be flat or they can have any shape or structure and can be arranged in a filtroprense or similar type grouping.
- three-dimensional electrodes should be used.
- connection of the electrodes to the source can be monopolar, bipolar or mixed, preferably, bipolar by the specific design of the electro-synthesis cell. Electrolysis can be performed at a temperature between 0 and 90 ° C.
- the current density can be between 1 mA / cm 2 and 5,000 mA / cm 2 and does not necessarily have to remain constant during electrolysis.
- the electroreduction operation is carried out with the composition of the solutions: Catolite: Acetate of an alkaline or alkaline earth cation whose concentration range can range between 0.01 M and the maximum concentration that allows its solubility in that medium, and N-acetylcystine in a concentration range of 0.01 to 4 M.
- the pH can range between 2.5 and 10.
- Anolyte Aqueous solution of any saline electrolyte.
- the acetate is sodium acetate and its concentration may be between 0.01 M and 20 M.
- the catholyte undergoes a distillation process under reduced pressure in which the water is removed. Then an alcohol is added to the residue, preferably one of the following: ethanol, isopropanol, methanol. A solution of hydrochloric acid is added to the resulting solution until the pH reaches a value lower than 2. A white precipitate will appear that is separated. The resulting solution is subjected to distillation under reduced pressure until all the solvent is removed, leaving a solid corresponding to the desired product (I). This white solid is crystallized and recrystallized from water, obtaining a white solid that meets the characteristics of the desired product for use as a pharmaceutical product. These analytical characteristics are:
- the solution containing IV (IV + Acetate in fig. 2) is subjected to an electroreduction + desalination process in an electrochemical cell or reactor or electrosynthesis cell that will consist of at least one cathode and an anode, a catholyte , an anolyte, a dilute and a concentrate, separated by suitable separation means (MA and MC of Fig. 2), such as an ion exchange membrane or any other appropriate separator.
- suitable separation means MA and MC of Fig. 2
- cathode electrodes consisting of graphite, carbon or its derivatives, lead, tin, zinc, copper, platinized titanium, any steel or alloy in which iron, aluminum or its alloys with gallium, indium or thallium, diffusion cathodes can be used of gas, or preferably, a graphite electrode, carbon or its derivatives in three-dimensional form with a suitable current collector.
- anode a stable electrode selected from: Ti-Pt, Ti-Pb, DSA oxygen, DSA chlorine, Pb0 2 , vitreous carbons, graphite, gas diffusion anode is used without these electrodes being limiting of the invention.
- the electrosynthesis cell includes one or more anodes constituted by DSA-Oxygen, in order to avoid the corrosion problems detected in other types of anodes used and that could lead to a product with non-pharmaceutical quality.
- Ethics US Pharmacopeia.
- the catholyte and the dilute (fig. 2) will be fed by the same solution from the acetylation of III and containing IV + acetate.
- the anolyte and concentrate may be fed by the same aqueous solution of any saline electrolyte, for example, an aqueous solution of sodium acetate (NaAc).
- anolyte and the dilute, and the catholyte and the concentrate, respectively, must necessarily be separated by suitable separation means, such as an ion exchange membrane, preferably a selective membrane that allows the passage of anions but not cations ( MA) in, or by any other type of separator.
- suitable separation means such as an ion exchange membrane, preferably a selective membrane that allows the passage of anions but not cations ( MA) in, or by any other type of separator.
- ion exchange membrane preferably a selective membrane that allows the passage of anions but not cations ( MA) in, or by any other type of separator.
- MA anions but not cations
- the dilute and the concentrate must necessarily be separated by suitable separation means, such as an ion exchange membrane, preferably a selective membrane that allows the passage of cations but not anions (MC) in, or by any other type. of separator.
- suitable separation means such as an ion exchange membrane, preferably a selective membrane that allows the passage of cations but not anions (MC) in, or by any other type. of separator.
- MC anions
- the electrodes can be flat or can have any shape or structure, and can be arranged in a filter-press type grouping or the like. Preferably, three-dimensional electrodes should be used.
- connection of the electrodes to the source can be monopolar, bipolar or mixed, preferably, bipolar by the specific design of the electro-synthesis cell. Electrolysis can be performed at a temperature between 0 and 90ec
- the current density can be between 1 mA / cm 2 and 5,000 mA / cm 2 and does not have to remain cer, necessarily, constant during electrolysis.
- the (diluted + catholyte) is subjected to a distillation process under reduced pressure in which the water is removed. Then an alcohol is added to the residue, preferably one of the following: ethanol, isopropanol, methanol.
- a solution of hydrochloric acid is added to the resulting solution until the pH reaches a value lower than 2.
- a white precipitate will appear that is separated.
- the resulting solution is subjected to distillation under reduced pressure until all the solvent is removed, leaving a solid corresponding to the desired product (I).
- This white solid is critalized and recrystallized in water to obtain a white solid that meets the characteristics of the desired product for use as a pharmaceutical product.
- the process of the present invention has clear advantages over the prior art, which can be summarized in the following points: a) It avoids the use of reducing agents (metals). b) The electrochemical reduction is performed. c) It is not necessary to precipitate and isolate the salts, since these are eliminated by another electrochemical technique: Electrodialysis. d) The isolation of the reaction medium is not required. e) The process conditions favor the formation of unwanted impurities. f) Virtually no environmental impact. g) Safety in the handling of reagents, since the dangerous ones (zinc) are eliminated avoiding the uncontrolled release of hydrogen. h) Decrease in the number of process stages. i) Total process automation, j) Higher product quality, as US Pharmacopea specifications are met.
- FIG 1 illustrates the electrochemical device used to carry out the first alternative of the process of the present invention
- A represents “ammonium membrane” and
- C represents “cationic membrane”.
- FIG. 2 illustrates the electrochemical device used to carry out the alternative according to the method of the present invention.
- M.A. represents” ammonium membrane
- M.C. representss” catholic membrane.
- CATIONIC MEMBRANE CMX ANIONIC MEMBRANE: AMX CATHODE: STAINLESS STEEL.
- ANODE Ti / Pt.
- ANODE Dimensionally stable anode MEMBRANE: Naphion
- the catholyte was the solution from the previous stage and cataloged as "diluted solution” and with a pH of 5.3.
- the anolyte was a solution of 4xlO " 2M sulfuric acid. After circulating a charge of 24 Ah maintaining a current density between 25-50 mA / cm 2 , the catholyte solution is rotated by removing water under reduced pressure. Subsequently, the residue is dissolved in methanol and the pH is adjusted with hydrochloric acid to a value of less than 2.
- ANODE DIMENSIONALLY STABLE ANODE.
- CONCENTRATE 0.75 liters of Sodium Acetate 0, 1M CATOLITE + DILUTED: 0.35 liters of the solution obtained in the previous section (contains IV, sodium acetate and water) pH: 7.3
- TOTAL CIRCULATED LOAD 100% Total load to circulate
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Water Supply & Treatment (AREA)
- Health & Medical Sciences (AREA)
- Urology & Nephrology (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
- Electrolytic Production Of Non-Metals, Compounds, Apparatuses Therefor (AREA)
Abstract
Description
Claims
Priority Applications (8)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE69701224T DE69701224T2 (de) | 1996-05-07 | 1997-05-07 | Verfahren zur elektrochemischen synthese von n-acetylcystein aus cystein |
US09/180,385 US6159352A (en) | 1996-05-07 | 1997-05-07 | Process for the electrochemical synthesis of N-acetylcysteine from cystine |
DK97919417T DK0905282T3 (da) | 1997-05-07 | 1997-05-07 | Fremgangsmåde til elektrokemisk syntese af N-acetylcystein ud fra cystin |
AU23896/97A AU714021B2 (en) | 1996-05-07 | 1997-05-07 | Process for the electrochemical synthesis of N-acetylcysteine from cystine |
AT97919417T ATE189273T1 (de) | 1996-05-07 | 1997-05-07 | Verfahren zur elektrochemischen synthese von n- acetylcystein aus cystein |
EP97919417A EP0905282B1 (en) | 1996-05-07 | 1997-05-07 | Process for the electrochemical synthesis of n-acetylcysteine from cystine |
JP9539562A JP2000509705A (ja) | 1996-05-07 | 1997-05-07 | シスチンからのn―アセチル―システインの電気化学的合成方法 |
GR20000400724T GR3033038T3 (en) | 1996-05-07 | 2000-03-22 | Process for the electrochemical synthesis of n-acetylcysteine from cystine |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ESP9601014 | 1996-05-07 | ||
ES09601014A ES2108654B1 (es) | 1996-05-07 | 1996-05-07 | Procedimiento para la sintesis electroquimica de n-acetilcisteina a partir de cistina. |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1997042358A1 true WO1997042358A1 (es) | 1997-11-13 |
Family
ID=8294718
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/ES1997/000113 WO1997042358A1 (es) | 1996-05-07 | 1997-05-07 | Procedimiento para la sintesis electroquimica de n-acetilcisteina a partir de cistina |
Country Status (11)
Country | Link |
---|---|
US (1) | US6159352A (es) |
EP (1) | EP0905282B1 (es) |
JP (1) | JP2000509705A (es) |
AT (1) | ATE189273T1 (es) |
AU (1) | AU714021B2 (es) |
CA (1) | CA2253538A1 (es) |
DE (1) | DE69701224T2 (es) |
ES (2) | ES2108654B1 (es) |
GR (1) | GR3033038T3 (es) |
PT (1) | PT905282E (es) |
WO (1) | WO1997042358A1 (es) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN110344077A (zh) * | 2019-07-01 | 2019-10-18 | 吉林大学 | 一种由l-胱氨酸电化学合成n-乙酰-l半胱氨酸的方法 |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ES2137105B1 (es) * | 1997-03-20 | 2000-08-16 | Dsm Deretil S A | Procedimiento para la obtencion de l-cisteinas n-monosustituidas por via electroquimica. |
DE19844061B4 (de) * | 1998-09-25 | 2007-03-29 | Degussa Ag | Verfahren zur Herstellung von N-Alkanoylcysteinen |
US6586810B2 (en) | 1999-06-04 | 2003-07-01 | Mrinal Thakur | Sensor apparatus using an electrochemical cell |
US6448621B1 (en) * | 1999-06-04 | 2002-09-10 | Mrinal Thakur | Sensor apparatus using an electrochemical cell |
DE10039171A1 (de) * | 2000-08-10 | 2002-02-28 | Consortium Elektrochem Ind | Kathode für Elektrolysezellen |
KR101805540B1 (ko) | 2011-06-08 | 2017-12-07 | 삼성에스디아이 주식회사 | 리튬티타네이트의 제조방법 |
US10821395B2 (en) | 2018-02-07 | 2020-11-03 | Palo Alto Research Center Incorporated | Electrochemical desalination system |
US11117090B2 (en) | 2018-11-26 | 2021-09-14 | Palo Alto Research Center Incorporated | Electrodialytic liquid desiccant dehumidifying system |
US11015875B2 (en) * | 2019-04-17 | 2021-05-25 | Palo Alto Research Center Incorporated | Electrochemical heat pump |
US11872528B2 (en) | 2021-11-09 | 2024-01-16 | Xerox Corporation | System and method for separating solvent from a fluid |
US11944934B2 (en) | 2021-12-22 | 2024-04-02 | Mojave Energy Systems, Inc. | Electrochemically regenerated liquid desiccant dehumidification system using a secondary heat pump |
CN115772104A (zh) * | 2022-11-15 | 2023-03-10 | 广东百澳药业有限公司 | 一种n-乙酰-l-半胱氨酸的制备方法 |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1030259A (en) * | 1964-10-29 | 1966-05-18 | Senju Pharma Co | Improvements in the production of n-acetyl-l-cysteine |
JPS523021A (en) * | 1975-06-24 | 1977-01-11 | Nippon Rikagaku Yakuhin Kk | Method for isolation of n-acylcysteine |
FR2577242A1 (fr) * | 1985-02-11 | 1986-08-14 | Air Liquide | Procede de fabrication d'amino-alcools par reduction electrochimique de nitro-alcools |
JPS63112546A (ja) * | 1986-10-29 | 1988-05-17 | Nippon Rikagaku Yakuhin Kk | 高水溶性n−アセチルアミノ酸類の製造方法 |
EP0436055A1 (en) * | 1990-01-04 | 1991-07-10 | The Electrosynthesis Company, Inc. | High yield methods for electrochemical preparation of cysteine and analogues |
ES2032155A6 (es) * | 1990-04-06 | 1993-01-01 | Almu S A | Procedimiento de obtencion de l-carboximetil-cisteina a partir de l-cisteina por metodos electroquimicos. |
WO1996038601A1 (es) * | 1995-06-01 | 1996-12-05 | Derivados Del Etilo, S.A. | Procedimiento para la obtencion de tioeteres para uso farmaceutico por metodos electroquimicos |
-
1996
- 1996-05-07 ES ES09601014A patent/ES2108654B1/es not_active Expired - Fee Related
-
1997
- 1997-05-07 EP EP97919417A patent/EP0905282B1/en not_active Expired - Lifetime
- 1997-05-07 AU AU23896/97A patent/AU714021B2/en not_active Ceased
- 1997-05-07 JP JP9539562A patent/JP2000509705A/ja not_active Ceased
- 1997-05-07 WO PCT/ES1997/000113 patent/WO1997042358A1/es active IP Right Grant
- 1997-05-07 AT AT97919417T patent/ATE189273T1/de not_active IP Right Cessation
- 1997-05-07 PT PT97919417T patent/PT905282E/pt unknown
- 1997-05-07 US US09/180,385 patent/US6159352A/en not_active Expired - Fee Related
- 1997-05-07 CA CA002253538A patent/CA2253538A1/en not_active Abandoned
- 1997-05-07 DE DE69701224T patent/DE69701224T2/de not_active Expired - Fee Related
- 1997-05-07 ES ES97919417T patent/ES2145598T3/es not_active Expired - Lifetime
-
2000
- 2000-03-22 GR GR20000400724T patent/GR3033038T3/el not_active IP Right Cessation
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1030259A (en) * | 1964-10-29 | 1966-05-18 | Senju Pharma Co | Improvements in the production of n-acetyl-l-cysteine |
JPS523021A (en) * | 1975-06-24 | 1977-01-11 | Nippon Rikagaku Yakuhin Kk | Method for isolation of n-acylcysteine |
FR2577242A1 (fr) * | 1985-02-11 | 1986-08-14 | Air Liquide | Procede de fabrication d'amino-alcools par reduction electrochimique de nitro-alcools |
JPS63112546A (ja) * | 1986-10-29 | 1988-05-17 | Nippon Rikagaku Yakuhin Kk | 高水溶性n−アセチルアミノ酸類の製造方法 |
EP0436055A1 (en) * | 1990-01-04 | 1991-07-10 | The Electrosynthesis Company, Inc. | High yield methods for electrochemical preparation of cysteine and analogues |
ES2032155A6 (es) * | 1990-04-06 | 1993-01-01 | Almu S A | Procedimiento de obtencion de l-carboximetil-cisteina a partir de l-cisteina por metodos electroquimicos. |
WO1996038601A1 (es) * | 1995-06-01 | 1996-12-05 | Derivados Del Etilo, S.A. | Procedimiento para la obtencion de tioeteres para uso farmaceutico por metodos electroquimicos |
Non-Patent Citations (2)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 001, no. 045 (C - 011) 4 May 1977 (1977-05-04) * |
PATENT ABSTRACTS OF JAPAN vol. 012, no. 358 (C - 531) 26 September 1988 (1988-09-26) * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN110344077A (zh) * | 2019-07-01 | 2019-10-18 | 吉林大学 | 一种由l-胱氨酸电化学合成n-乙酰-l半胱氨酸的方法 |
Also Published As
Publication number | Publication date |
---|---|
PT905282E (pt) | 2000-05-31 |
CA2253538A1 (en) | 1997-11-13 |
DE69701224D1 (de) | 2000-03-02 |
JP2000509705A (ja) | 2000-08-02 |
ES2108654A1 (es) | 1997-12-16 |
AU714021B2 (en) | 1999-12-16 |
ES2108654B1 (es) | 1998-07-01 |
US6159352A (en) | 2000-12-12 |
DE69701224T2 (de) | 2000-07-27 |
GR3033038T3 (en) | 2000-08-31 |
AU2389697A (en) | 1997-11-26 |
EP0905282B1 (en) | 2000-01-26 |
ATE189273T1 (de) | 2000-02-15 |
EP0905282A1 (en) | 1999-03-31 |
ES2145598T3 (es) | 2000-07-01 |
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