WO1990014335A1 - Process for the n-monoacylation of cysteine - Google Patents
Process for the n-monoacylation of cysteine Download PDFInfo
- Publication number
- WO1990014335A1 WO1990014335A1 PCT/SE1990/000322 SE9000322W WO9014335A1 WO 1990014335 A1 WO1990014335 A1 WO 1990014335A1 SE 9000322 W SE9000322 W SE 9000322W WO 9014335 A1 WO9014335 A1 WO 9014335A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- cysteine
- process according
- acid halide
- chloride
- alkali carbonate
- Prior art date
Links
Classifications
-
- 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
Definitions
- the present invention relates to an improved and simplified process for the selective N-monoacylation of cysteine.
- N-acylderivatives of L-cysteine typified by N-acetyl-L-cysteine and N-isobutyryl-L-cysteine have unique mucolytic properties and are of value for treatment of respiratory diseases.
- N-monoacylated-L-cysteine is a straight forward process
- several problems occur, i.a. to avoid the formation of N,S-diacylated compounds resp. to eliminate free acid formed by using acid anhydride.
- the object of the present invention is to provide an improved and simplified method for obtaining N-monoacylated-L-cysteine by acylation of L-cysteine with one chemical equivalent of acid halide R-CO-X, wherein R is CH 2 CH 3 , CH(CH 3 ) 2 , C(CH 3 ) 3 , (CH 2 ) 3 CH 3 or CH 2 CH(CH 3 ) 2 and X prefereably is CI, without racemization of the starting material or by reaction of N,S-diacylated-L- cysteine
- the starting material L-cysteine
- the starting material is acylated with one chemical equivalent of acid halide, i.e.
- N,S-diacylated-L-cysteine and one chemical equivalent of L-cysteine in water containing alkali carbonate or a suitable mixture of water containing alkali carbonate and any reaction stable organic solvent will result in N-monoacylated-L-cysteine.
- alkali carbonate preferably potassium carbonate
- water as a buffer, giving the desired pH of about 7.1 about 10 in the reaction mixture, prefereably 8 - 9.5.
- N-monoacylated-L-cysteine After the reaction is completed, pH is reduced momentarily down to below 4, and prefereably below 2 by the addition of a strong acid, such as cone, hydrochloric acid.
- a strong acid such as cone, hydrochloric acid.
- the N-monoacylated-L-cysteine then crystallizes, eventually after cooling of the reaction mixture and/or the addition of petroleumether and/or after evaporation of part of the organic solvent and then the crystals may be filtered off and dried.
- the monoacylation is performed in water buffered with alkali carbonate, prefereably sodium or potassium carbonate, or in a mixture of water and an against acid halide non-reactive organic solvent.
- Suitable solvents to be used in mixture with water are alkyl chlorides such as methylene chloride, lower aliphatic cyclic ethers such as tetrahydrofuran, alkylethers such as tert . - butylmetyleter, alkylacetates such as etyl-, propyl- and butylacetat, alkylketons, alkylesters.
- alkyl chlorides such as methylene chloride
- lower aliphatic cyclic ethers such as tetrahydrofuran
- alkylethers such as tert . - butylmetyleter
- alkylacetates such as etyl-, propyl- and butylacetat, alkylketons, alkylesters.
- Potassium carbonate 180 g is dissolved in water (500 ml). Methylene chloride (500 ml) is added and the mixture is cooled to -8°C. Isobutyryl chloride (87 g, 0.82 mol) is added followed by the addition of L-cysteine (100 g, 0.82 mol). The temperature is adjusted to 20 - 25°C and after 2 hours at this temperature hydrochloric acid cone. (150 ml) is added to pH ⁇ 1. The heavy methylene chloride phase containing the product is separated. N- isobutyryl-L-cysteine is crystallized by addition of petroleumether (500 ml), filtered off and dried at 50°C in vacuum.
- N,S-diisobutyrylcysteine is dissolved in a mixture of 200 ml water, 200 ml methylene chloride and 56.7 g potassium carbonate. 38.0 g L-cysteine is added at room temperature. After 1 hour hydrochloric acid cone. (75 ml) is added to a pH of 0.54. The water phase is discharged. N-isobutyrylcysteine is crystallized by addition of petroleumether (40 - 65°), the crystals are filtered off and dried.
- Tert.-butylmetyleter 80 ml is added to a mixture of water (115 ml), potassium carbonate (37.5 g) and L-cysteine (20.2 g) and the temperature is adjusted to 8°C.
- Isobutyryl chloride (17.8 g) is added dropwise and the reaction mixture is heated to 25°C. pH of the mixture is 9.5. After 1 hour at 25°C, hydrochloric acid cone. (35 ml) is added to pH 0.5. The reaction mixture is cooled whereby the product crystallizes. The crystals are filtered of f and dried.
- Example 5 Butylacetate (80 ml) is added to a mixture of water (115 ml), potassium carbonate (37.5 g) and L-cysteine (20.2 g) and the temperature is adjusted to 4°C. Isobutyryl chloride (17.8 g) is added dropwise and the reaction mixture is heated to 25°C. pH of the mixture is 9.5. After 1 hour at 25°C hydrochloric acid cone. (35 ml) is added to pH 0.53. The water phase is discharged. 14 % of the organic phase is evaporated, the reaction mixture is cooled, and the product crystallizes. Petroleumether (40 - 65°) is added, the crystals are filtered off at 2°C and dried.
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE8901766 | 1989-05-17 | ||
SE8901766-9 | 1989-05-17 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1990014335A1 true WO1990014335A1 (en) | 1990-11-29 |
Family
ID=20375973
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/SE1990/000322 WO1990014335A1 (en) | 1989-05-17 | 1990-05-15 | Process for the n-monoacylation of cysteine |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0472634A1 (en) |
AU (1) | AU5678290A (en) |
WO (1) | WO1990014335A1 (en) |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1197637A (en) * | 1956-07-21 | 1959-12-02 | Rech S Et Propagande Scient | Process for the production of cysteine ester derivatives and novel derivatives which can be prepared by this process |
GB954268A (en) * | 1962-02-26 | 1964-04-02 | Mead Johnson & Co | Decongestant compositions comprising n-acylated sulphydryl compounds |
US4093740A (en) * | 1973-02-16 | 1978-06-06 | Deutsche Gold- Und Silber-Scheideanstalt Vormals Roessier | Fodder for ruminants |
EP0304778A1 (en) * | 1987-08-21 | 1989-03-01 | Degussa Aktiengesellschaft | Process for the production of N-acylated mercapto-alpha-amino acids |
EP0317540A1 (en) * | 1987-11-19 | 1989-05-24 | Aktiebolaget Draco | Cysteine derivatives, processes for their preparation and their use |
-
1990
- 1990-05-15 AU AU56782/90A patent/AU5678290A/en not_active Abandoned
- 1990-05-15 EP EP19900908715 patent/EP0472634A1/en not_active Withdrawn
- 1990-05-15 WO PCT/SE1990/000322 patent/WO1990014335A1/en not_active Application Discontinuation
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1197637A (en) * | 1956-07-21 | 1959-12-02 | Rech S Et Propagande Scient | Process for the production of cysteine ester derivatives and novel derivatives which can be prepared by this process |
GB954268A (en) * | 1962-02-26 | 1964-04-02 | Mead Johnson & Co | Decongestant compositions comprising n-acylated sulphydryl compounds |
US4093740A (en) * | 1973-02-16 | 1978-06-06 | Deutsche Gold- Und Silber-Scheideanstalt Vormals Roessier | Fodder for ruminants |
EP0304778A1 (en) * | 1987-08-21 | 1989-03-01 | Degussa Aktiengesellschaft | Process for the production of N-acylated mercapto-alpha-amino acids |
EP0317540A1 (en) * | 1987-11-19 | 1989-05-24 | Aktiebolaget Draco | Cysteine derivatives, processes for their preparation and their use |
Also Published As
Publication number | Publication date |
---|---|
EP0472634A1 (en) | 1992-03-04 |
AU5678290A (en) | 1990-12-18 |
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