GB1326531A - Cephalosporin compounds - Google Patents
Cephalosporin compoundsInfo
- Publication number
- GB1326531A GB1326531A GB4250269A GB1326531DA GB1326531A GB 1326531 A GB1326531 A GB 1326531A GB 4250269 A GB4250269 A GB 4250269A GB 1326531D A GB1326531D A GB 1326531DA GB 1326531 A GB1326531 A GB 1326531A
- Authority
- GB
- United Kingdom
- Prior art keywords
- group
- compound
- reaction
- formula
- acid
- 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.)
- Expired
Links
Classifications
-
- 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
- C07D501/02—Preparation
- C07D501/04—Preparation from compounds already containing the ring or condensed ring systems, e.g. by dehydrogenation of the ring, by introduction, elimination or modification of substituents
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Cephalosporin Compounds (AREA)
Abstract
1326531 Cephalosporins GLAXO LABORATORIES Ltd 6 Aug 1970 [26 Aug 1969 23 Jan 1970 26 March 1970 10 July 1970] 42502/69 3463/70 14980/70 and 33698/70 Heading C2A Novel cephalosporin 1-sulphoxides of Formula IV or V wherein R<SP>1</SP> is a protected amino group, R<SP>2</SP> is hydrogen or a carboxyl-blocking group, X is Cl, Br or I and Z is H or Br are prepared by brominating a corresponding 3-methyl cephalosporin 1-sulphoxide and in the case of compounds of Formula IV optionally converting the 3-bromomethyl group to a 3-chloromethyl or 3-iodomethyl group. R<SP>1</SP> is preferably an acylamido group containing 1-20 carbon atoms, numerous such groups being listed. R<SP>2</SP> may be the residue of an ester-forming alcohol or phenol R<SP>2</SP>OH, the group-COOR<SP>2</SP> preferably being t-butoxycarbonyl, 2,2,2-trichloroethoxycarbonyl or a silyloxycarbonyl group. The bromination is preferably effected in an inert solvent using bromine itself, 1,3,5-tribromo- 1,2,4-triazole or an N-bromoamide or bromoimide, e.g. N-bromoacetamide, N-bromosuccinimide, N-bromophthalimide, N-bromocaprolactam or a 1,3-dibromo-5,5-dialkylhydantoin. The bromination reaction is initiated by a freeradical initiator such as an azo compound or a peroxide, or by irradiation by ultra-violet or visible light or γ-radiation. Small amounts (e.g. 5% by volume) of water and weak bases, e.g. NaHCO 3 , Na 2 CO 3 , CaCO 3 or sodium acetate, are preferably added to the reaction medium to assist the initiation and improve the yield. The reaction may be conducted under an inert atmosphere. Conversion to 3-chloromethyl or 3-iodomethyl compounds is by reaction of the 3-bromo compound with an alkali metal chloride or iodide, suitably in a solvent such as acetone or dimethyl-formamide. The compounds of Formula V are by-products and are preferably subjected to Zn/acid reduction to re-form the 3-methyl starting material and then re-cycled to give further yields of the compounds of Formula IV. Antibiotically active known cephalosporins of formula VIII and salts thereof, wherein R<SP>10</SP>CO is an acyl group and Y is the residue of a nucleophile, are prepared by subjecting a compound of Formula IV to the following procedures in any order: (a) reduction of the 1-sulphinyl group to the corresponding sulphide; (b) reaction with a nucleophile to displace the group X by a nucleophilic group; (c) removal of the group R<SP>2</SP> to give the 4-carboxyl compound which may optionally be converted to a salt; (d) if required, N-deacylating to give the 7-amino compound and reacylating to introduce R<SP>10</SP>, when this differs from the group R<SP>1</SP>. Reaction (a) may be effected by converting the sulphoxide to the corresponding acyloxy- or alkyloxy-sulphonium salt by reaction with acyl chloride and reducing the salt with sodium dithionite or potassium iodide, or else by treating the sulphoxide with PCl 3 or PBr 3 in a solvent. The nucleophilic displacement (b) is carried out in a solvent which may be the nucleophile itself, at pH 5-8 preferably in the presence of an acid acceptor e.g. triethylamine, and especially in the case of oxygen nucleophiles, in the presence of a salt of Hg, Ag or Au. Many nucleophilic substances are listed, grouped into nitrogen-, sulphur-, carbon- and oxygen-nucleophiles. The de-esterification (c) and N-acyl group replacement (d) are carried out by conventional procedures appropriate to the nature of the groups R<SP>1</SP>, R<SP>10</SP> and R<SP>2</SP>. The 3 - methyl cephalosporin 1 - sulphoxide starting materials are prepared by oxidizing a compound of Formula III wherein R<SP>1</SP> and R<SP>2</SP> are as defined above and the dotted line indicates that the compound may be a #<SP>2</SP> or #<SP>3</SP> cephem compound or a mixture thereof. The oxidation is effected preferably below 10‹ C. in an organic solvent with metaperiodic acid, peracetic acid, permonophthalic acid or m-chloroperbenzoic acid in an amount such as to provide one atom of active oxygen per atom of dihydrothiazine sulphur.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB4250269 | 1969-08-26 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1326531A true GB1326531A (en) | 1973-08-15 |
Family
ID=10424725
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB4250269A Expired GB1326531A (en) | 1969-08-26 | 1969-08-26 | Cephalosporin compounds |
Country Status (3)
Country | Link |
---|---|
GB (1) | GB1326531A (en) |
YU (1) | YU36185B (en) |
ZA (1) | ZA705851B (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4012382A (en) * | 1974-06-05 | 1977-03-15 | Daniel Bouzard | α-Amino and α-formyl-α-(p-acyloxyphenyl)acetamidocephalosporanic acid derivatives |
EP0001149A1 (en) * | 1977-09-07 | 1979-03-21 | Gist-Brocades N.V. | Process for the preparation of 3-bromomethyl-3-cephem-sulphoxide derivatives |
EP0034394A2 (en) * | 1980-02-14 | 1981-08-26 | Gist-Brocades N.V. | Process for the preparation of 3'-bromosubstituted deacetoxycephalosporanic acid sulphoxide derivatives |
EP0047560A2 (en) * | 1980-09-05 | 1982-03-17 | Gist-Brocades N.V. | Process for the preparation of 7-acylamino-3-(thio-substituted)methyl-3-cephem-4-carboxylic acid 1-oxide derivatives |
US4558123A (en) * | 1983-07-22 | 1985-12-10 | Eli Lilly And Company | 3-Exomethylene cephalosporins |
-
1969
- 1969-08-26 GB GB4250269A patent/GB1326531A/en not_active Expired
-
1970
- 1970-08-25 ZA ZA705851A patent/ZA705851B/en unknown
- 1970-08-26 YU YU2150/70A patent/YU36185B/en unknown
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4012382A (en) * | 1974-06-05 | 1977-03-15 | Daniel Bouzard | α-Amino and α-formyl-α-(p-acyloxyphenyl)acetamidocephalosporanic acid derivatives |
EP0001149A1 (en) * | 1977-09-07 | 1979-03-21 | Gist-Brocades N.V. | Process for the preparation of 3-bromomethyl-3-cephem-sulphoxide derivatives |
EP0034394A2 (en) * | 1980-02-14 | 1981-08-26 | Gist-Brocades N.V. | Process for the preparation of 3'-bromosubstituted deacetoxycephalosporanic acid sulphoxide derivatives |
EP0034394A3 (en) * | 1980-02-14 | 1981-11-25 | Gist - Brocades N.V. | Process for the preparation of 3'-bromosubstituted deacetoxycephalosporanic acid sulphoxide derivatives |
US4366315A (en) | 1980-02-14 | 1982-12-28 | Gist-Brocades N.V. | Process for preparing 3'bromo-desacetoxycephalosporanic acid sulfoxide compounds |
EP0047560A2 (en) * | 1980-09-05 | 1982-03-17 | Gist-Brocades N.V. | Process for the preparation of 7-acylamino-3-(thio-substituted)methyl-3-cephem-4-carboxylic acid 1-oxide derivatives |
EP0047560A3 (en) * | 1980-09-05 | 1982-12-01 | Gist - Brocades N.V. | Process for the preparation of 7-acylamino-3-(thio-substituted)methyl-3-cephem-4-carboxylic acid 1-oxide derivatives |
US4558123A (en) * | 1983-07-22 | 1985-12-10 | Eli Lilly And Company | 3-Exomethylene cephalosporins |
EP0132394B1 (en) * | 1983-07-22 | 1988-10-12 | Eli Lilly And Company | Improvements in or relating to the preparation of 3-exomethylene cephalosporins |
Also Published As
Publication number | Publication date |
---|---|
ZA705851B (en) | 1972-04-26 |
YU215070A (en) | 1981-06-30 |
YU36185B (en) | 1982-02-25 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
429A | Application made for amendment of specification (sect. 29/1949) | ||
429H | Application (made) for amendment of specification now open to opposition (sect. 29/1949) | ||
429D | Case decided by the comptroller ** specification amended (sect. 29/1949) | ||
PCNP | Patent ceased through non-payment of renewal fee |