WO2003004477A1 - 1,3,4-oxadiazol-2-yl thioesters and their use for acylating 7-aminocephalosporins - Google Patents
1,3,4-oxadiazol-2-yl thioesters and their use for acylating 7-aminocephalosporins Download PDFInfo
- Publication number
- WO2003004477A1 WO2003004477A1 PCT/IN2001/000113 IN0100113W WO03004477A1 WO 2003004477 A1 WO2003004477 A1 WO 2003004477A1 IN 0100113 W IN0100113 W IN 0100113W WO 03004477 A1 WO03004477 A1 WO 03004477A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- formula
- compound
- cephalosporin
- oxo
- methoxyimino
- Prior art date
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- 0 C*CCN=C(C(N=C(C)*C)=O)O Chemical compound C*CCN=C(C(N=C(C)*C)=O)O 0.000 description 3
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D271/00—Heterocyclic compounds containing five-membered rings having two nitrogen atoms and one oxygen atom as the only ring hetero atoms
- C07D271/02—Heterocyclic compounds containing five-membered rings having two nitrogen atoms and one oxygen atom as the only ring hetero atoms not condensed with other rings
- C07D271/10—1,3,4-Oxadiazoles; Hydrogenated 1,3,4-oxadiazoles
- C07D271/113—1,3,4-Oxadiazoles; Hydrogenated 1,3,4-oxadiazoles with oxygen, sulfur or nitrogen atoms, directly attached to ring carbon atoms, the nitrogen atoms not forming part of a nitro radical
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D501/00—Heterocyclic compounds containing 5-thia-1-azabicyclo [4.2.0] octane ring systems, i.e. compounds containing a ring system of the formula:, e.g. cephalosporins; Such ring systems being further condensed, e.g. 2,3-condensed with an oxygen-, nitrogen- or sulfur-containing hetero ring
Definitions
- the present invention relates to novel thioester derivatives of the general formula (I) prepared by the reaction of 4-halogeno-2-methoxyimino-3-oxo-butyric acid (II) with 5- substituted-l,3,4-oxadiazole-2-thiol of formula (III).
- the invention also discloses the use of the new intermediate (I) for the preparation of cephalosporanic antibiotics (VI) in excellent yields and purity.
- R ⁇ represents - C 4 alkyl or phenyl
- Acid chlorides, anhydrides, esters, amide etc. are reported in the chemical literature for activation of carboxylic acid of formula (IV) . Activation in the form of acid chloride required protection and deprotection of NH 2 group.
- US patent 4,767,852 discloses a process for production of cephems by acylating 7-amino- 3-cephem-4-carboxylic acid with 2-mercaptobenzothiazolyl-(Z)-2-(2-aminothiazol-4-yl)-2- methoxyiminoacetate (MAEM).
- US Pat.No.5,026,843 disclosed a process for preparing ceftriaxone disodium hemiheptahydrate by acylation of 7-amino-3-[[(2,5- dihydro-6-hydroxy-2-methyl-5-oxo-l,2,4-triazin-3yl)thio]methyl]3-cephem-4-carboxylic acid (ACT) by using MAEM as acylating agents in good yield and quality.
- MAEM has become the standard acylating agent for the preparation of cephalosporins having an oximino group and a 2-aminothiazolyl group in 7-position of cephem compounds.
- 0 842 937 discloses the formation of amide bond with cephem moiety by reacting with the thioester derivative prepared by using 2,2'-dithio-bis-benzothiazole.
- the preparation of this active thioester involves use of same costly condensing agent triphenylphosphine (TPP) which has been mentioned earlier in the text.
- TPP triphenylphosphine
- 4-halogeno - 2 - methoxyimino-3-oxo-butyric acid represented by formula (II) also suffer with almost in same disadvantages which are commonly prevalent for 2-(2-aminothiazol-4-yl)-2-methoxyiminoacetic acid (IV).
- the primary objective of the invention is to provide new reactive thioester derivatives of 4- halogeno-2-methoxyimino-3-oxo-butyric acid of the general formula (I), which would be suitable for being used in the manufacture of cephalosporin antibiotics and would not be associated with the complexities mentioned above.
- Another objective of the present invention is to provide a process for the preparation of above mentioned new thioesters (I) in good yields.
- One more objective of the present invention is to provide a process for the preparation of cephalosporin antibiotics of the general formula (VI) from the said novel thioester derivatives.
- Another objective of the present invention is to provide a process for the preparation of cephalosporin antibiotics e.g. cefotaxime, ceftriaxone, cefetamet, ceftiofur, cefpodoxime etc. which comprises condensation of new reactive derivatives (I) with cephem compounds (V) and insitu cyclisation with thiourea to obtain targeted antibiotics(VI) in excellent yields and purity.
- Still another objective of the present invention is to produce cephalosporin antibiotics that are highly pure and free from toxic byproducts.
- the present invention provides novel thioester derivatives of 4-halogeno-2-methoxyimino- 3-oxo-butyric acid of the general formula (I) also , the invention provides a method by which the said thioester derivatives can be prepared by reacting of 4-halogeno-2- methoxyimino-3-oxo-butyric acid of the general formula (II) with 2-mercapto-5- substituted- 1,3, 4-oxadiazole of the general formula (III) (preparation of m, J. Am. Chem.
- the present invention provides new thioesters of 4-halogeno-2-methoxyimino-3-oxo- butyric acid of general formula (I).
- the synthesis of compound (I) is achieved by preparing activated complex of 4-halogeno-2-methoxyimino-3-oxo-butyric acid (II) with DMF-POCI 3 followed by the reaction with thio-oxadiazoles of the general formula (III) in organic solvent in presence of an organic base at the temperature between -30°C and +20°C.
- the reactive active ester is obtained quantitative yields (95-99%).
- Ri represents C 1 -C alkyl or phenyl
- the reactive thioester were characterized by NMR, IR and Mass spectra . A major side
- X is chloro , bromo or iodo.
- the organic solvent is selected from the group comprising dichloromethane, tetrahydrofuran, dioxane, N,N-dimethylformamide, acetonitrile and mixtures thereof.
- the organic base is selected from the group comprising triethylamine, diethylamine, tributylamine, pyridine, N-alkylanilines, and mixtures thereof.
- cephalosporin antibiotics obtained are of high purity (90-99%).
- the method gives an excellent yield (70-95%) of cephalosporin without necessitating the protection of the amino group of the acylating agents, and the toxic byproduct 2-mercaptobenzothiazole is not produced.
- the cephalosporin antibiotic were synthesized by following two methods: Method-I The reactive thioester (I) was reacted with 7-aminocephem compound (V)
- Ri represents - alkyl or phenyl
- R 2 represents H , CH 3 , CH 2 OCH 3 , CH 2 OCOCH 3 ,
- R 3 is hydrogen, salt or carboxylic protecting group.
- R is hydrogen or silyl. in organic solvent in the presence of base to obtained condensed product , which was not isolated and is directly cyclised with thiourea in mixture of water and a polar organic solvent like tetrahydrofuran, dimethylformamide, dioxane, alcohol to obtain desired cephalosporanic antibiotics of very good purity and excellent yields.
- Method -II In this approach, starting from active ester of formula (I) final product was prepared in one pot reaction.
- the process comprises cyclization of active ester in the first step and in same reactor addition of amino cephem compound in mixture of water and a polar organic solvent like tetrahydrofuran, dimethylformamide, dioxane, alcohols to obtain desired cephalosporanic antibiotics of equally good purity and yields as compared to first approach.
- This approach provides a simple , cheap and commercially viable method without the necessity of isolating thioester and without producing any toxic byproduct namely 2-mercaptobenzothiazole.
- the substituent R 2 in cephem compound (V) and (VI) represents hydrogen, methyl, acetyloxymethyl, methoxymethyl, 2,5-dihydro-6-hydroxy-2-methyl-5-oxo- 1 ,2,4-triazine-3- thiol, furanyl-2-carbonyl thiol or a standard cephalosporin substituents.
- R 3 in cephem compound (V) and (VI) represents hydrogen , salt or a ester group which can be easily removed e.g. p-methoxybenzyl , p-nitrobenzyl , diphenylmethyl , phenacyl , trimethylsilyl etc.
- the organic base may be selected from the group consisting of triethylamine, N-methylmorpholine, pyridine, N-methylanilines, 1,5- diazabicyclo[4.3.0] non-5-ene, l,4-diazabicyclo[2.2.2]octane, 4-dimethylaminopyridine, and mixtures thereof.
- the aqueous layer is subjected for charcoal treatment.
- Thiourea (18.4g) and sodium acetate (4.2g) were added to the filtered aqueous layer and stirred for 1.0 hr to get the cefotaxime which was isolated with subsequent acidification of the aqueous layer with dil. HC1 at 10°C to pH 3.0.
- the solid separated was filtered, washed with water and ethylacetate and then dried under vacuum at 40-45°C to get Cefotaxime, 40.9g (yield 98%).
- Example -5 7-[[(Z)-2-(Aminothiazol-4-yl)-2-methoxyimino]acetamido]-3-methoxymethyl-3-cephem- 4-carboxylic acid [Cefpodoxime acid].
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP01949861A EP1399429A1 (en) | 2001-06-14 | 2001-06-14 | 1,3,4-oxadiazol-2-yl thioesters and their use for acylating 7-aminocephalosporins |
PCT/IN2001/000113 WO2003004477A1 (en) | 2001-06-14 | 2001-06-14 | 1,3,4-oxadiazol-2-yl thioesters and their use for acylating 7-aminocephalosporins |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/IN2001/000113 WO2003004477A1 (en) | 2001-06-14 | 2001-06-14 | 1,3,4-oxadiazol-2-yl thioesters and their use for acylating 7-aminocephalosporins |
Publications (1)
Publication Number | Publication Date |
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WO2003004477A1 true WO2003004477A1 (en) | 2003-01-16 |
Family
ID=11076356
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/IN2001/000113 WO2003004477A1 (en) | 2001-06-14 | 2001-06-14 | 1,3,4-oxadiazol-2-yl thioesters and their use for acylating 7-aminocephalosporins |
Country Status (2)
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EP (1) | EP1399429A1 (en) |
WO (1) | WO2003004477A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2005040175A2 (en) * | 2003-10-22 | 2005-05-06 | Ranbaxy Laboratories Limited | Process for the preparation of cephem carboxylic acids |
CN102993216A (en) * | 2013-01-06 | 2013-03-27 | 瑞普(天津)生物药业有限公司 | Preparation method of ceftiofur hydrochloride |
CN104876948A (en) * | 2015-05-28 | 2015-09-02 | 华北制药河北华民药业有限责任公司 | Preparation method of ceftriaxone sodium |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0030294A2 (en) * | 1979-11-21 | 1981-06-17 | F. HOFFMANN-LA ROCHE & CO. Aktiengesellschaft | Process for the preparation of cephalosporin derivatives; intermediates and their preparation |
US4767852A (en) * | 1980-03-28 | 1988-08-30 | Biochemie | New process for producing cephalosporin antibiotics, and novel intermediates for use in such process and their production |
EP0842937A2 (en) * | 1996-11-19 | 1998-05-20 | Hichem Pharma S.p.A. | Process for the preparation of the cephalosporin derivatives cefotaxime and ceftriaxone |
US5869649A (en) * | 1996-03-18 | 1999-02-09 | Ranbaxy Laboratories Ltd. | Process for producing cephalosporin antibiotics |
-
2001
- 2001-06-14 EP EP01949861A patent/EP1399429A1/en not_active Withdrawn
- 2001-06-14 WO PCT/IN2001/000113 patent/WO2003004477A1/en not_active Application Discontinuation
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0030294A2 (en) * | 1979-11-21 | 1981-06-17 | F. HOFFMANN-LA ROCHE & CO. Aktiengesellschaft | Process for the preparation of cephalosporin derivatives; intermediates and their preparation |
US4767852A (en) * | 1980-03-28 | 1988-08-30 | Biochemie | New process for producing cephalosporin antibiotics, and novel intermediates for use in such process and their production |
US5869649A (en) * | 1996-03-18 | 1999-02-09 | Ranbaxy Laboratories Ltd. | Process for producing cephalosporin antibiotics |
EP0842937A2 (en) * | 1996-11-19 | 1998-05-20 | Hichem Pharma S.p.A. | Process for the preparation of the cephalosporin derivatives cefotaxime and ceftriaxone |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2005040175A2 (en) * | 2003-10-22 | 2005-05-06 | Ranbaxy Laboratories Limited | Process for the preparation of cephem carboxylic acids |
WO2005040175A3 (en) * | 2003-10-22 | 2005-07-28 | Ranbaxy Lab Ltd | Process for the preparation of cephem carboxylic acids |
CN102993216A (en) * | 2013-01-06 | 2013-03-27 | 瑞普(天津)生物药业有限公司 | Preparation method of ceftiofur hydrochloride |
CN104876948A (en) * | 2015-05-28 | 2015-09-02 | 华北制药河北华民药业有限责任公司 | Preparation method of ceftriaxone sodium |
Also Published As
Publication number | Publication date |
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EP1399429A1 (en) | 2004-03-24 |
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