NEW CEPHALOSPORIN DERIVATIVES AND ANTIBIOTICS CONTAINING THE SAME

Abstract: New cephalosporin derivatives of a general formula (I) and non-toxic salts and non-toxic esters thereof are provided: (wherein R represents an acyclic or cyclic lower alkyl group having l-6 carbon atoms, which may optionally be substituted by a halogen atom; the steric configuration as asterisked (*) includes an optical-active (R)-form or (S)-form or an optical-inactive (RS)-form; n is 0 or l, n¹ is 0 to 3, n² is 0 to 3; and when n¹ is 0, n² is 3; when n¹ is l, n² is 2; when n¹ is 2, n² is l; when n¹ is 3, n² is 0). The new derivatives of the formula (I) and non-­ toxic salts and esters thereof have high bactericidal activity with broad antibacterial spectra, and these are useful as active ingredients in bactericides.

Description: The present invention relates to novel cephalosporin compounds having a 1-alkylpyridinium-4-ylthiomethyl group in the 3-position and an acyl group or a branched 1-alkyl-1-carboxymethoxyiminoaminothiazoleacetic acid in the 7-position as well as to antibiotics containing the compound. Cephalosporins have widely been utilized as antibiotics for mammals including humans. Various studies have extensively been made in this technical field for the purpose of intensifying the effectiveness and the safety of the cephalosporin antibiotics, and the outlines are described say in "Penicillin and Cephalosporin" (written by Edwin H. Flynn and published by Academic Press Co., in 1972) or "Structure Activity Relationships among the semisynthetic Antibiotics" (written by D. Perlman and published by Academic Press Co., in 1977). According to the disclosure of these publications, various kinds of cephalosporin-type compounds having an increased anti bacterial activity may be obtained by introducing various kinds of substitutes in the 7-acyl group or 3-substituent in the compounds. For example, the introduction of an acyl group as derived from an α-alkoxyiminoaminothiazoleacetic acid into the 7-position of cephalosporin compounds has been noticed in these years, and U.S. Patent Nos. 4,098,888 and 4,166,115 and British Patent No. 2,022,090 describe compounds having a residue derived from an α-methoxyiminoaminothiazoleacetic acid, and in addition, German Patent No. 2,921,316 describes compounds having a residue derived from an α-dimethylcarbomethoximinoaminothiazoleacetic acid. Thus, various studies have widely been made in this technical field to vary the part of the alkoxy-substituent in the α-alkoxyimino part of the aminothiazoleacetic acid residue in the cephalosporin compounds. In the FR-A 2 426 694 for example there are disclosed cephalosporins in which the α-carbon atom of the carboxyloxiimino group is substituted by two C₁-C₄ alkyl groups, or a C₃-C₇ cycloalkylidene group. However, in the FR-A 2 441 629 the carbon atom of the carboxyloxyimino group is always unsubstituted. On the other hand, the introduction of residues of various kinds of heterocyclic compounds in the 3-positioned substituent of cephalosporin compounds has heretofore been tried. However, there are only some few compounds into which a pyridinium quaternary salt residue is introduced via a sulfur atom in the form of a 1-alkylpyridinium-4-ylthiomethyl group, and Japanese Patent Application OPI No. 90590/83 and No. 89289/80 describes some of these compounds. (The term "OPI" as used herein means an "unexamined published application"). These compounds are insufficient in the anti-bacterial activity and have some problems in the actual and practical use thereof. In the EP-A- 088 853 there are disclosed cephalosporin compounds having an α-alkoxyiminoaminothiazoleacetic acid in the 7-position and haloalkylpyridinium-4-ylthiomethyl group in the 3-position wherein the sulfur atom of the cephem nucleus is covalently bound to an oxygen atom. In order to solve problem of the compounds in the practical use, the present inventors have prepared new cephalosporin compounds having a 1-fluoroethylpyridinium-4-ylthiomethyl group in the 3-position and have already filed a prior patent application of Japanese Patent Application. No. 254517/84. Afterwards, the present inventors have further made various studies on the point of the stereochemical configuration of the alkoxyimino part in the 7-side position of the cephem nucleus of the cephalosporin compounds and have found new compounds having an improved anti bacterial activity against antibiotic-resistant bacteria and having an increased practical usability, and thus have solved the problems now in question. SUMMARY OF THE INVENTION Accordingly, one subject matter of the present invention is to provide cephalosporin derivatives of a general formula (I) and non-toxic salts and non-toxic esters thereof: wherein R represents an acyclic or cyclic lower alkyl group having up to 6 carbon atoms, which may optionally be substituted by a halogen atom; the steric configuration as asterisked (*) includes an optical-active (R)-form or (S)-form or an optical-inactive (RS)-form; and n is 0 or 1, X is CH₃, CH₂F, CHF₂ or CF₃ . Another subject matter of the present invention is to provide bactericides containing a component selected from the new caphalosporin derivatives of the general formula (I) and non-toxic salts or non-toxic esters thereof, as an active ingredient. DETAILED DESCRIPTION OF THE INVENTION Examples of the compounds of the present invention, as represented by the above general formula (I), are given below. The compounds of the general formula (I) of the present invention may be obtained, for example, as follows: 1. Formation of compounds to be introduced into the 7- positioned side chain in the formula (I): The compounds may be obtained according to any of the following processes (A), (B) and (C). (A) In case the asterisked (*) part in the compounds of the formula (I) is an (RS)-form, the compounds are formed as shown in the following reaction formula, in accordance with the method of Belgian Patent No. 823, 651: (In the reaction formula, TR represents an triphenylmethyl group, A represents a carboxylic acid-protective group, X represents a halogen atom, and R has the same meaning as above.) According to the above reaction formula, an α-hydroxyiminoaminothiazoleacetic acid derivative of the formula (II) is reacted with an α-halocarboxylic acid derivative of the formula (III), which has a desired alkyl group R, in the presence of a strong base, to obtain a compound of the formula (IV) having the R-group in the alkoxime part therein. The compound (IV) is optionally subjected to optical resolution, to obtain its optical-active (R)-form and (S)-form. As the case may be, the carboxylic acid of the starting compound (II) is preferably optionally protected. (B) In case the asterisked (*) part in-the compounds of the formula (I) is an optical-active (R)-form or (S)-form and these optical active compounds (I) are to be directly obtained, an optical-active α-hydroxycarboxylic acid of the formula (V) having a desired alkyl group R is used, and this acid (V) is reacted with an alcohol in accordance with Mitsunobu Reaction, which is a general dehydration reaction between an alcohol and an acidic group. (In the reaction formula,  represents a phenyl group, and R, TR and A have the same meanings as above.) According to the above reaction formula, a compound of the formula (V) is reacted with N-hydroxyphthalimide in the presence of triphenylphosphine and diethyl azodicarboxylate by dehydration reaction, to obtain an N-alkoxyphtalimide derivative of the formula (VI). This derivative (VI) is treated with hydrazine to remove the phthaloyl group therefrom, to obtain an 0-alkylhydroxyamine derivative of the formula (VII). Next, this compound (VII) is reacted with an α-oxoaminothiazoleacetic acid derivative of the formula (VIII) to obtain an optically active aminothiazoleacetic acid derivative of the formula (IX) where the foot part of the alkyl group R is optically active. The compounds of the formula (VIII) to be used in the above reaction may be obtained according to the method as illustrated in Japanese Patent Application OPI No. 10899/77. (C) The optical active compounds of the formula (IX) may be obtained according to another method, using the compound of the formula (II) and the compound of the formula (V), as follows: (In the reaction formula, Ts represents a toluenesulfonic acid group, Ms represents a methanesulfonic acid group, and R and A have the same meanings as above.) According to the above reaction formula, an alcohol of the formula (V) is treated with a toluenesulfonic acid chloride (Ts-Cl) or a methanesulfonic acid chloride (Ms-Cl) in the presence of a base to obtain a toluenesulfonate or methanesulfonate of the formula (X). Next, the resulting ester (X) is reacted with a compound of the formula (II) in the presence of a base to obtain the desired product of the formula (IX). In the above methods (B) and (C), the case where the asterisked (*) part in the compound of the formula (IX) has an (S)-configuration is specially mentioned. In the same manner, in case a starting compound of the formula (V) which has the other (R)-configuration is used, another compound of the formula (IX) which has the (R)-configuration may be obtained under the same reaction condition. 2. Formation of the products of the formula (I): The compounds of the formula (I) may be obtained according to the following method (D) or (E): (In the reaction formula, R, TR, A, X, n, n¹ and n² have the same meanings as above.) According to the above reaction formula, the compound of the formula (IV) is condensed with a 7-amino-3-halogenomethylcephalosporin derivative of the formula (XI) to obtain a compound of the formula (XII). Next, this compound (XII) is reacted with a desired pyridothione derivative of the formula (XIII) by substitution-reaction to obtain a compound of the formula (XIV). In the final, the protective groups in the resulting compound (XIV) are removed to obtain the compound of the formula (I) of the present invention. In the above steps, the methods for the formation of the compounds of the formulae (XII) and (XIV) are per se known, which are illustrated say in Japanese Patent Application OPI No. 090590/83. Regarding the formation of the compounds of the formulae (XIII) and (XIV), the present inventors have concurrently filed another Japanese Patent Application No. 024184/85 to claim the methods therefor. In case the compound of the formula (IX) is used as the starting compound in the present reaction, the corresponding compound or the formula (I) may be obtained in the same manner. (E) In the above method (D), the aminothiazole derivative is first introduced into the 7-amino group of the cephalosporin compound and then the 3-positioned group in the resulting intermediate is reacted with the pyridothione derivative. In some other cases, this reaction order is often preferably reversed, as follows: (In the reaction formula, A, n¹ and n² have the same meanings as above.) The resulting compound of the formula (XIV) is deprotected in the same manner as the process (D), to obtain the aimed product of the formula (I) of the present invention. The compounds of the formula (XV) as obtained in the above process are illustrated in the present inventors' own Japanese Patent Application No. 024184/85. The compounds of the present invention thus obtained are important antibiotics which may be applied to mammals including humans, perorally or non-perorally. In case the compounds of the present invention are to be used as a bactericide, for example, against human infectious disease, the compound is perorally or non-perorally administered in an amount of one dose/adult of 50-1500mg, preferably 100-100mg, two times to six times a day. The bactericides of the present invention are, in general, composed of the compound of the formula (I) of the present invention and a solid or liquid vehicle. Regarding the form of the preparations, the present bactericidal compositions are manufactured in the form of solid preparations such as tablets, capsules or powders or of liquid preparations such as injections, suspensions or syrups. Any known solid or liquid vehicles may be used for the formation of these preparations, which are generally used in this technical field. The effect of the present invention will be described below. The compounds of the formula (I) of the present invention have high bactericidal activity with broad bactericidal spectra, and the bactericidal spectra of some typical compounds of the present invention against various pathogenic bacteria in vitro are given in the following Table-1, as represented by the minimum growth-inhibitory concentration (MIC). The compounds of the present invention have been obtained as the result of the stereochemical investigation on the alkoxyimino part in the 7-positioned substituent of the cephem nucleus of cephalosporin compounds, as described above. It has heretofore been said, that the bactericidal activity of cephalosporin compounds will increase because of the increment of the bulkiness of the substituent B of the alkoxyimino part in the compounds, as represented by: Despite of such conventional knowledge, the present inventors have found that the increment of the bactericidal activity of cephalosporin compounds apparently results from the stereochemical factor of the part of the substituent B. More precisely, the bactericidal activity of the compounds increases in the order of (S)-form > (RS)-form > (R)-form. This fact is proved by the above-described Table-1, and further, this is more apparently clarified by the following Table-2. The Table-2 shows the result of the comparison of the bactericidal activity of the compounds in which B represents -CH₂-COOH, From the interpretation of the bulkiness of the substituent B, the bactericidal activity of the compound in which B is is theoretically to be middle between the compound in which B is -CH₂-COOH and that in which B is and in fact, the optically inactive compound with (RS)-configuration was actually found to follow this theory, in the experiment by the present inventors. However, the compound with (S)-configuration was found to have a higher bactericidal activity than the compound in which B is more bulky or Regarding the toxicity of the compounds of the present invention, the result in the acute toxicity test where the compound was applied to mice by intravenous injection proved that LD₅₀ of the compounds was 3g/kg or more. The present invention will be explained in greater detail by reference to the following examples, which, however, are not intended to be interpreted as limiting the scope of the present invention. Referential Example 1: (a) Diphenylmethyl (2R)-2-(phenoxyacetyloxy) propionate: 4.00g (15.6mmol) of diphenylmethyl (2S)-2-hydroxypropionate, 2.49g (15.6mmol) of phenoxyacetic acid and 4.90g (18.7mmol) of triphenylphosphine were dissolved in 100ml of THF, and after cooled with ice, 2.96ml (18. 7mmol) of diethyl asodicarboxylate was added thereto and the whole was stirred for 1 hour at the same temperature. The solvent was distilled out, and the residue was purified by silicagel-chromatography (solvent: toluene), to obtain 5.70g of the above-entitled compound. ¹H-NMR (90MHz, CDCl₃, δppm) 1.47 (3H,d,J=6.8Hz), 4.62(2H,s), 5.30 (1H,q,J=6.8Hz), 6.84 (1H,s), 6.70-7.40 (15H,m) [α] D + 29 (C=5.0 CHCl₃) (b) Diphenylmethyl (2R)-2-hydroxypropionate: 5.70g (14.6mmol) of diphenylmethyl (2R)-2-(phenoxyacetyloxy)propionate was dissolved in 40ml of methanol, 0.7ml of 25%-aqueous ammonia was added thereto and the whole was stirred for 1 hour at room temperature, and thereafter 1N-HCl was added thereto to adjust the pH value thereof to 7.0 and the solvent was distilled out therefrom. The residue was dissolved in ethyl acetate, washed with water, dried and concentrated and thereafter purified by silicagel-chromatography (toluene/ethyl acetate=10/1) to obtain 2.71g of the above-entitled compound. ¹H-NMR (90MHz, CDCl₃, δppm) 1.42 (3H,d,J=6.8Hz), 2.76 (1H,s), 4.33 (1H,q,J=6.8Hz), 6.89 (1H,s), 7.10-7.40 (10H,m) [α] D + 9.1 (C=5.00, CHCl₃) (c) Diphenylmethyl (2S)-2-phthaloyloxypropionate: 2.27g (8.86mmol) of diphenylmethyl (2R)-2-hydroxypropionate, 1.44g (8.86mmol) of N-hydroxyphtalimide and 2.78g (10.6mmol) of triphenylphosphine were dissolved in 70ml of THF, and after cooled with ice, 1.68ml (10. 6mmol) of diethyl azodicarboxylate was added thereto and stirred for 3 hours at the same temperature and then concentrated. The residue was purified by silicagelchromatography (toluene/ethyl acetate=5/1), to obtain 3. 20g of the above-entitled compound. ¹H-NMR (90MHz, CDCl₃, δppm) 1.64 (3H,d,J=6.BHz), 5.02 (1H,q,J=6.8Hz), 6.89 (1H,s), 7.10-7.80 (14H,m) [α] D - 59 (C=5.0, CHCl₃) (d) 2-(2-tritylamino-4-thiazolyl)-2-(1S)-(1-diphenylmethoxycarobnyl)ethoxyimino acetic acid-syn isomer: 1.0g (2.49mmol) of diphenylmethyl (2S)-phthaloyloxypropionate was dissolved in 80ml of THF, and 122µl (2.49mmol) of hydrazine (mono-hydrate) was added thereto and stirred for 1 hour at room temperature, and after cooled with ice, 0.4ml of 6N-HCl aqueous solution was added thereto and further stirred for 30minutes at the same temperature and then filtrated. 20ml of methanol and 1.03g (2.49mmol) of 2-(2-tritylamino-4-thiazolyl)glyoxalic acid were added to the resulting filtrate and stirred for 3 hours, while the pH value of the solution was adjusted to 4.5-5.5. The reaction solution was concentrated and the resulting residue was dissolved in ethyl acetate, and after the solution was washed with an acidic water (pH 2.0), this was concentrated to 15ml and crystallized to obtain 1.2g of the above-entitled compound. ¹H-NMR (90MHz, CDCl₃, δppm) 1.50 (3H,d,J=7.0Hz), 5.07 (1H,q,J=7.0Hz), 6.64 (1H,s), 6.88 (1H,s), 7.10-7.50 (25H,m) [α] D - 10.2 (C=5.0, CHCl₃) Referential Example 2: (a) Diphenylmethyl (2R)-2-phthaloyloxypropionate: According to the treatment of the step (c) in the Referential Example 1, diphenylmethyl (2S)-2-hydroxypropionate was used and the above-entitled compound was obtained. [α] D + 63 (C=5.0, CHCl₃) (b) (2-tritylamino-4-thiazolyl)-2-{(1R)-(1-diphenylmethoxycarbonyl)ethoxyimino}acetic acid-syn isomer: According to the treatment of the step (d) in the Referential Example 1, diphenylmethyl (2R)-2-phthaloyloxypropionate was used and the above-entitled compound was obtained. [α] D + 10.0 (C=5.0, CHCl₃) Referential Example 3: (a) Diphenylmethyl (2S)-2-(p-toluenesulfonyloxy) propionate: 1g (4.0mmol) of diphenylmethyl (2S)-2-hydroxypropionate was dissolved in 10ml of methylene chloride, and 1.29ml (16mmol) of pyridine and 2.3g (12mmol) of tosyl chloride were added thereto, while cooled with ice, and reacted for one night at room temperature. The solvent was removed out and the resulting residue was dissolved in ethyl acetate, washed with water, 1N-HCl and aqueous sodium bicarbonate solution, and dried, concentrated and then purified by silicagel-chromatography (toluene) to obtain 1.31g of the above-entitled compound. ¹H-NMR (90MHz, CDCl₃, δppm) 1.50 (3H,d,J=7Hz), 2.35 (3H,s), 5.05(1H,q,J=7Hz), 6.85 (1H,s), 7.05-7.75 (14H,m) (b) Allyl 2-(2-tritylamino-4-thiazolyl)-2-(1R)-(1-diphenylmethoxycarobnyl)ethoxyimino acetate-syn isomer: 1.30g (3.17mmol) of diphenylmethyl (2S)-2-(p-toluenesulfonyloxy)propionate and 0.74g (1.59mmol) of allyl 2-(2-tritylamino-4-thiazolyl)-2-hydroxyiminoacetate-syn isomer were dissolved in 4.7ml of DMF, and 0.66g (4.8mmol) of potassium carbonate was added thereto and reacted for one night. Ethyl acetate was added to the reaction solution, washed with water and 1N-HCl, and dried and concentrated and then purified by silicagel-chromatography (toluene/ethyl acetate=50/1) to obtain 0.75g of the above-entitled compound. ¹H-NMR (90MHz, CDCl₃, δppm) 1.50 (3H,d,J=7.0Hz), 4.40-6.20 (6H,m), 6.65 (1H,s), 6.85 (1H,s), 7.10-7.50 (25H,m) (c) 2-{(2-tritylamino-4-thiazolyl)-2-(1R)-(1-diphenylmethoxycarbonyl)ethoxyimino} acetic acid-syn isomer: 750mg (1.06mmol) of allyl 2-(2-tritylamino-4-thiazolyl)-2-{(1R)-(1-diphenylmethoxycarbonyl) ethoxyimino}acetate-syn isomer was dissolved in 7.5ml of methylene chloride, and 26mg of triphenylphosphine and 26mg of tetrakis(triphenylphosphine)palladium (0) were added thereto in N₂-stream. After complete dissolution, ethyl acetate solution containing 200mg (1.1mmol) of potassium 2-ethyl-hexanoate was added to the resulting solution and reacted for 10 minutes. After the reaction, the solvent was distilled out and isopropylether was added to obtain a precipitate. The precipitate formed was dissolved in ethyl acetate, and the pH value of the resulting solution was adjusted to 2, and the solution was washed with water and dried and then concentrated to obtain crystalline 700mg of the above-entitled compound. ¹H-NMR (90MHz, CDCl₃, δppm) 1.50 (3H,d,J=7Hz), 5.05 (1H,q,J=7Hz), 6.50 (1H,s), 6.85 (1H,s), 7.10-7.50 (25H,m) Referential Example 4: p-Methoxybenzyl 3-chloromethyl-7-[2-(2-tritylamino-4-thiazolyl)-2-{(diphenylmethoxycarbonyl)ethoxyimino} acetamido}-ceph-3-em-4-carboxylate-syn isomer: 97mg (0.24mmol) of p-methoxybenzyl 7-amino-3-chloromethyl-ceph-3-em-4-carboxylate hydrochloride and 120mg (0.27mmol) of 2-(2-tritylamino-4-thiaozlyl)-2-{diphenylmethoxycarbonyl)ethoxyimino}acetic acid-syn isomer were dissolved in 3ml of methylene chloride, and 98µl (1.2mmol) of pyridine and 24µl (0.27mmol) of phosphorus oxychloride were added thereto, while cooled with ice, and reacted for 10 minutes. After the reaction, 12ml of chloroform was added and the resulting solution was washed twice with 6ml of water and dried with magnesium sulfate and then, the solvent was distilled out. The resulting residue was purified by silicagel-chromatography (benzene/ethyl acetate=20/1) to obtain 180mg of the above-entitled compound. ¹H-NMR (90MHz, CDCl₃, δppm) 1.54,1.60 (3H,d,J=7.3Hz), 3.10,3.30,3.45,3.57 (2H,ABq,J=18Hz), 3.80 (3H,s), 4.31,4.37,4.58,4.60 (2H,ABq,J=12Hz), 4.92,4.93 (1H,d,J=5Hz), 5.00-5.30 (1H,m), 5.20 (2H,s), 5.87,5.91 (1H,dd,J-5Hz8Hz) 6.70 (1H,s), 6.80-7.50 (30H,m) Referential Example 5: p-Methoxybenzyl 7-{2-(2-tritylamino-4-thiazolyl)-2-(diphenylmethoxycarbonylethoxyimino)acetamido}-3-[{1-(2-fluoroethyl)pyridinium}-4-ylthiomethyl]-ceph-3-em-4-carboxylate iodide: 157mg (0.24mmol) of p-methoxybenzyl 3-{1-(2-fluoroethyl)-pyridinium-4-ylthiomethyl}-7-amino-ceph-3-em-4-carboxylate iodide hydrochloride and 120ml (0. 27mmol) of 2-(2-tritylmaino-4-thiazolyl)-2-{(diphenylmethoxycarbonyl) ethoxyimino}acetic acid-syn isomer were dissolved in 3ml of methylene chloride, and 98µl (1.2mmol) of pyridine and 24µl (0.27mmol) of phosphorus oxychloride were added thereto, while cooled with ice, and reacted for 15 minutes. After the reaction, the solvent was distilled out and isopropylether was added to the resulting residue to form a precipitate. This precipitate was dried and then purified by silicagel-chromatography (chloroform/methanol=10/1) to obtain 200mg of the above-entitled compound. ¹H-NMR (90MHz, CDCl₃, δppm) 1.57 (3H,d,J=7.2Hz), 3.35,3.50 (2H,ABq,J=18Hz), 3.75 (3H,s), 4.35(2H,s), 4.50-5.20 (5H,m), 4.95,4.96 (1H,d,J=5Hz), 5.16 (2H,s), 5.74,5.75 (1H,dd,J=5Hz,8Hz), 6.65 (1H,s), 6.70-7.30 (30H,m), 7.65,8.73 (4H,ABq,J=6.3Hz) Example 1: (6R,7R)-7-{(Z)-2-(2-Aminothiazol-4-yl)-2-(1-carboxyethoxyimino)acetamido}-3-[{1-(2-fluoroethyl) pyridinium}-4-ylthiomethyl]-ceph-3-em-4-carboxylate: 280mg (0.28mmol) of p-methoxybenzyl 3-chloromethyl-7-[{2-tritylamino-4-thiazolyl)-2-(1-diphenylmethoxycarbonyl-ethoxyimino)acetamido}-ceph-3-em-4-carboxylate-syn isomer was dissolved in 3ml of acetone, and 1.0ml of acetone solution containing 60mg (0.4mmol) of sodium idodide was added to the resulting solution at room temperature and reacted for 40 minutes. After the reaction, the solvent was distilled out, and methylene chloride was added to the resulting residue, the insoluble materials were filtered off, and the remaining filtrate was concentrated under reduced pressure, to obtain p-methoxybenzyl 3-iodomethyl-7-{2-(2-tritylamino-4-thiazolyl)-2-(1-diphenylmethoxycarbonyl-ethoxyimino)acetamido}-ceph-3-em-4-carboxylate-syn isomer. To this was added 52mg (0. 34mmol) of 1-(2-fluoroethyl)-4-pyridothione, and the resulting mixture was dissolved in 3ml of chloroform and reacted for 1 hour at room temperature. After the reaction, the chloroform was distilled out under reduced pressure, and the residue was purified by silicagel-chromatography (chloroform/ethanol=10/1) and dissolved in 0.8ml of anisol, and then, 4.0ml of trifluoroacetic acid was added thereto, while cooled with ice, and reacted for 1 hour. After the reaction, isopropylether was added to the reaction solution to form a precipitate. After dried, 190mg of a powder was obtalnea. To this was added 1ml of water and the pH value of the resulting solution was adjusted to 7.8 with sodium hydrogencarbonate, and the solution was purified with HP-20 resin (methanol/H₂O=1/4) to obtain 110mg of the above-entitled compound. ¹H-NMR (90MHz, D₂O, δppm) 1.40 (3H,d,J=6.8Hz), 3.40,3.70 (2H,ABq,J=17.9Hz), 4.25 (2H,s), 4.50-5.20 (5H,m), 5.17 (1H,d,J=4.6 Hz), 5.60-5.70 (1H,m), 6.84 (1H,s), 7.80,8.37 (4H,ABq,J=6.6Hz) Example 2: (6R,7R)-7-[(Z)-2-(2-Aminothiazol-4-yl)-2-{(1R)-carboxyethoxyimino}acetamido]-3-[{1-(2-fluoroethyl)pyridinium}-4- ylthiomethyl]-ceph-3-em-4-carboxylate: 140mg (0.14mmol) of p-methoxybenzyl 3-chloromethyl-7-[2-(2-tritylamino-4-thiazolyl)-2-{(1R)- diphenylmethoxycarbonyl-ethoxyimino}acetamido]-ceph-3-em-4-carboxylate-syn isomer was dissolved in 1ml of acetone, and 0.5ml of acetone solution containing 30mg (0.2mmol) of sodium iodide was added to the resulting solution at room temperature and reacted for 40 minutes. After the reaction, the solvent was distilled out, methylene chloride was added to the resulting residue, the insoluble materials were filtrated out, and the remaining filtrate was concentrated under reduced pressure to obtain p-methoxybenzyl 3-iodomethyl-7-[2-(2-tritylamino-4-thiazolyl)-2-{(1R)-diphenylmethoxycarbonylethoxyimino}acetamido]-ceph-3-em-4-carboxylate-syn isomer. To this was added 26mg (0. 17mmol) of 1-(2-fluoroethyl)-4-pyridothione, and the resulting mixture was dissolved in 1ml of chloroform and reacted for 1 hour at room temperature. After the reaction, the chloroform was distilled out under reduced pressure, and the resulting residue was purified by silicagel-chromatography (chloroform/methanol=10/1) and dissolved in 0.4ml of anisole. To this was added 2.0ml of trifluoroacetic acid,while cooled with ice, and reacted for 1 hour. After the reaction, isopropylether was added thereto to form a precipitate. After dried, 100mg of a powder was obtained. To this was added 1ml of water and the pH value of the resulting solution was adjusted to 7.8 with sodium hdyrogencarbonate, and the solution was purified with HP-20 resin (methanol/H₂O = 1/4) to obtain 60mg of the above-entitled compound. ¹H-NMR (400MHz, D₂O,δppm) 1.44 (3H,d,J=6.9Hz), 3.50,3.73 (2H,ABq,J=17.9Hz), 4.25,4.37 (2H,ABq,J=14.0Hz), 4.63 (1H,q,J=6.9Hz), 4.66-4.96 (4H,m), 5.20 (1H,d,J=4.6Hz), 5.75 (1H,d,J=4.6Hz), 6.96 (1H,s), 7.89,8.45 (4H,ABq,J=7.9 Hz) Example 3: (6R,7R)-7-[(Z)-2-(2-Aminothiazol-4-yl)-2-{(1S)-carboxyethoxyimino}acetamido]-3-[{1-(2-fluoroethyl)pyridinium}-4-ylthiomethyl]-ceph-3-em-4-carboxylate: 300mg (0.29mmol) of p-methoxybenzyl 3-chloromethyl-7-[2-(2-tritylamino-4-thiazolyl)-2-{(1S)-diphenylmethoxycarbonylethoxyimino}acetamido]-ceph-3-em-4-carboxylate was dissolved in 20ml of acetone, and 1. 0ml of acetone solution containing 60mg (0.44mmol) of sodium idoide was added to the resulting solution at room temperature and reacted for 40 minutes. After the reaction, the solvent was distilled out, and methylene chloride was added to the resulting residue, the insoluble materials were filtrated out, and the remaining filtrate was concentrated under reduced pressure to obtain p-methoxybenzyl 3-iodomethyl-7-[2-(2-tritylamino-4-thiazolyl)-2-{(1S)-diphenylmethoxycarbonylethoxyimino}acetamido]-ceph-3-em-4-carboxylate-syn isomer. To this was added 45mg (0. 32mmol) of 1-(2-fluoroethyl)-4-pyridothione and the resulting mixture was dissolved in 2ml of chloroform and reacted for 1 hour at room temperature. After the reaction, the chloroform was distilled out under reduced pressure, and the residue was purified by silicagel-chromatography (chloroform/methanol=10/1) and dissolved in 0.5ml of anisole, and then, 2.5ml of trifluoroacetic acid was added thereto, while cooled with ice, and reacted for 1 hour. After the reaction, isopropylether was added to the reaction mixture to form a precipitate therein. After dried, 130mg of a powder was obtained. To this was added 1ml of water and the pH value of the resulting solution was adjusted to 7.8 with sodium hydrogencarbonate, and the solution was purified with HP-20 resin (mothanol/H₂O=1/4) to obtain 70mg of the above-entitled compound. ¹H-NMR (400MHz, D₂O,δppm) 1.45 (3H,d,J=7.2Hz), 3.47,3.72 (2H,ABq,J=17.4Hz), 4.21,4.36 (2H,ABq,J=13.8Hz), 4.64 (1H,q,J=7.2Hz), 4.73-4.96 (4H,m), 5.19 (1H,d,J=4.6Hz), 5.79 (1H,d,J=4.6Hz), 6.98 (1H,s), 7.86,8.46 (4H,ABq,J=6.9Hz) Example 4: (6R,7R)-7-{(Z)-2-(2-Aminothaizol-4-yl)-2-(1-carboxypropyloxyimino)acetamido}-3-[{1-(2-fluoroethyl) pyridinium}-4-ylthiomethyl]-ceph-3-em-4-carboxylate: 100mg (0.1mmol) of p-methoxybenzyl 3-chloromethyl-7-{2-(2-tritylamino-4-thiazolyl)-2-(1-diphenylmethoxycarbonylpropyloxyimino)acetamido}-ceph-3-em-4-carboxylate-syn isomer was dissolved in 1ml of acetone, and 0.5ml of acetone solution containing 28mg (0.19mmol) of sodium iodide was added to the resulting solution at room temperature and reacted for 40 minutes. After the reaction, the solvent was distilled out, methylene chloride was added to the residue, the insoluble materials were filtrated out, and the remaining filtrate was concentrated under reduced pressure, to obtain p-methoxybenzyl 3-iodomethyl-7-{2-(2-tritylamino-4-thiazolyl)-2-(1-diphenylmethoxycarbonyl-propyloxyimino) acetamido}-ceph-3-em-4-carboxylate-syn isomer. To this was added 18mg (0.11mmol) of 1-(2-fluoroethyl)-4-pyridothione, and the resulting mixture was dissolved in 1ml of chloroform and reacted for 1 hour at room temperature. After the reaction, the chloroform was distilled out under reduced pressure, and the residue was purified by silicagel-chromatography (chloroform/methanol=10/1) and dissolved in 0.4ml of anisole, and then 1.3ml of trifluoroacetic acid was added thereto,while cooled with ice, and reacted for 1 hour. After the reaction, isopropylether was added to the reaction solution to form a precipitate therein. After dried, 80mg of a powder was obtained. To this was added 1ml of water and the pH value of the resulting solution was adjusted to 7.8 with sodium hydrogencarbonate, and the solution was purified with HP-20 resin (methanol/H₂O=1/4) to obtain 45mg of the above- entitled compound. ¹H-NMR (90MHz, D₂O, δppm) 1.12 (3H,t,J=7.5Hz), 1.97(2H,q,J=7.5Hz), 3.61,3.62,3.91,3.92 (2H,ABq,J=18Hz), 4.47 (2H,s), 4.62-5.42 (6H,m), 5.82-5.92 (1H,m), 7.06(1H,s), 7.98,7.99,8.56,8.57 (4H,ABq,J=6.9Hz) Example 5: (6R,7R)-7-{(Z)-2-(2-Aminothiazol-4-yl)-2-(1-carboxy-1-cyclohexylmethoxyimino-aceta}-3-[{1-(2-fluoroethyl) pyridinium}-4-ylthiomethyl]-ceph-3-em-4-carboxylate: 40mg (0.04mmol) of p-methoxybenzyl 3-chloromethyl-7-{2-(2-tritylamino-4-thiazolyl)-2-(1-diphenylmethoxycarbonyl-1-cyclohexylme)acetamido}-ceph-3-em-4-carboxylate-syn isomer was dissolved in 1ml of acetone, and 0.5ml of acetone solution containing 11mg (0.07mmol) of sodium iodide was added to the resulting solution at room temperature and reacted for 40 minutes. After the reaction, the solvent was distilled out, methylene chloride was added to the resulting residue, the insoluble materials were filtrated out, and the remaining filtrate was concentrated under reduced pressure to obtain p-methoxybenzyl 3-iodomethyl-7-{2-(2-tritylamino-4-thiazolyl)-2-(1-diphenylmethoxycarbonyl-1-cyclohexylme)-acetamido}-ceph-3-em-4-carboylate-syn isomer. To this was added 7mg (0.04mmol) of 1-(2-fluoroethyl)-4-pyridothione, and the resulting mixture was dissolved in 1ml of chloroform and reacted for 1 hour at room temperature. After the reaction, the chloroform was distilled out under reduced pressure, and the residue was purified by silicagel-chromatography (chloroform/methanol=10/1) and dissolved in 0.12ml of anisole,and then, 0.4ml of trifluoroacetic acid was added thereto, while cooled with ice, and reacted for 1 hour. After the reaction, isopropylether was added to the reaction solution to form a precipitate therein. After dried, 30mg of a powder was obtained. To this was added 1ml of water and the pH value of the resulting solution was adjusted to 7.8 with sodium hydrogencarbonate, and the solution was purified with HP-20 resin (methanol/H₂O=1/4) to obtain 14mg of the above-entitled compound. ¹H-NMR (90MHz, D₂O, δppm) 1.08-2.08 (11H,m), 3.60,3.89 (2H,ABq,J=18Hz), 4.38-4.58 (3H,m), 4.88-5.58 (4H,m), 5.36 (1H,d,J=4.5Hz), 5.82,5.83 (1H,d,J=4.5Hz), 7.06 (1H,s), 8.02,8.58 (4H,ABq,J=6.2Hz) Example 6: (6R,7R)-7-{(Z)-2-(2-Aminothiazol-4-yl)-2-(1-carboxy-2-fluoroethoxyimino)acetamido-3-[{1-(2-fluoroethyl)-pyridinium}-4-ylthiomethyl]-ceph-3-em-4-carboxylate: 130mg (0.125mmol) of p-methoxybenzyl 3-chloromethyl-7-{2-(2-tritylamino-4-thiazolyl)-2-(1-diphenylmethoxycarbonyl-2-fluoroethoxy)-acetamido}-ceph-3-em-4-carboxylate-syn isomer was dissolved in 1ml of acetone, and 0.5ml of acetone solution containing 28mg (0.19mmol) of sodium iodide was added to the resulting solution at room temperature and reacted for 40 minutes. After the reaction, the solvent was distilled out, methylene chloride was added to the resulting residue, the insoluble materials were filtrated out, and the remaining filtrate was concentrated under reduced pressure to obtain p-methoxybenzyl 3-iodomethyl-7-{2-(2-tritylamino-4-thiazolyl)-2-(1-diphenylmethoxycarbonyl-2-fluoroethoxy)acetamido}-ceph-3-em-4-carboxylate-syn isomer. To this was added 23mg (0.15mmol) of 1-(2-fluoroethyl)-4-pyridothione, and the resulting mixture was dissolved in 1ml of chloroform and reacted for 1 hour at room temperature. After the reaction, the chloroform was distilled out under reduced pressure, and the residue was purified by silicagel-chromatography (chloroform/methanol=10/1) and dissolved in 0.15ml of anisole, and then, 1.5ml of trifluoroacetic acid was added thereto, while cooled with ice, and reacted for 1 hour. After the reaction, isopropylether was added to the reaction solution to form a precipitate therein. After dried, 70mg of a powder was obtained. To this was added 1ml of water and the pH value of the resulting solution was adjusted to 7.8 with sodium hydrogencarbonate,and the solution was purified with HP-20 resin (methanol/H₂O=1/4) to obtain 32mg of the above-entitled compound. ¹H-NMR (400MHz, D₂O, δppm) 3.48,3.49,3.72 (2H,ABq,J=18.0Hz), 4.22,4.23,4.40,4.41 (2H,ABq), 4.70-5.00 (7H,m), 5.20(1H,d,J=4.4Hz), 5.76,5.79(1H,d,J=4.4Hz), 7.02,7.03 (1H,s), 7.87,8.46(4H,ABq,J=6.9Hz) Example 7: (6R,7R)-7-[(Z)-2-(2-Aminothiazol-4-yl)-2-{(1S)-carboxyethoxyimino}acetamid]-3-(1-methylpyridinium-4-ylthiomethyl)-ceph-3-em-4-carboxylate: 150mg (0.15mmol) of p-methoxybenzyl 3-chloromethyl-7-[2-(2-tritylamino-4-thiazolyl)-2-{(1S)-diphenylmethoxycarobnylethoxyimino}-acetamido]-ceph-3-em-4-carboxylate-syn isomer was dissolved in 3ml of acetone, and 1.0ml of acetone solution containing 33mg (0.22mmol) of sodium idodie was added to the resulting solution at room temperature and reacted for 40 minutes. After the reaction, the solvent was distilled out, methylene chloride was added to the residue, the insoluble materials were filtrated out, and the remaining filtrate was concentrated under reduced pressure to obtain p-methoxybenzyl 3-iodomethyl-7-[2-(2-tritylamino-4-thiaozlyl)-2-{(1S)-diphenylmethoxycarobnyl-ethoxyimino}-acetamido]-ceph-3-em-4-carboxylate-syn isomer. To this was added 21mg (0. 18mmol) of 1-ethyl-4-pyridothione, and the resulting mixture was dissolved in 5ml of chloroform and reacted for 1 hour at room temperature. After the reaction, the chloroform was distilled out under reduced pressure, and the residue was purified by silicagel-chromatography (chloroform/methanol=10/1) and dissolved in 0.2ml of anisole, and then, 1.5ml of trifluoroacetic acid was added thereto, while cooled with ice, and reacted for 1 hour. After the reaction, isopropylether was added to the reaction solution to form a precipitate therein. After dried, 100mg of a powder was obtained. To this was added 1ml of water and the pH value of the resulting solution was adjusted to 7.8 with sodium hydrogencarbonate, and the solution was purified with HP-20 resin (methanol/H₂O=1/4) to obtain 49mg of the above-entitled compound. ¹H-NMR (90MHz, D₂O, δppm) 1.45 (3H,d,J=6.8Hz), 3.42,3.72 (2H,ABq,J=17.6Hz), 4.17 (3H,s), 4.28 (2H,s), 4.77 (1H,q,J=6.8Hz), 5.20 (1H,d,J=4.6Hz), 5.74 (1H,d,J=4.6Hz), 6.93 (1H,s), 7.81,8.34 (4H,ABq,J=6.6Hz) Example 8: (6R,7R)-7-[(Z)-2-(2-Aminothiazol-4-yl)-2-(1S)-carboxyethoxyimino}acetamido]-3-(1-ethylpyridinium-4-ylthiomethyl)-ceph-3-em-4-carboxylate: 150mg (0.15mmol) of p-methoxybenzyl 3-chloromethyl-7-[2-(2-tritylamino-4-thiazolyl)-2-{(1S)-diphenylmethoxycarbonylethoxyimino}acetamido]-ceph-3-em-4-carboxylate-syn isomer was dissolved in 3ml of acetone, and 1.0ml of acetone solution containing 33mg (0.22mmol) of sodium iodide was added to the resulting solution at room temperature and reacted for 40 minutes. After the reaction, the solvent was distilled out, methylene chloride was added to the residue, the insoluble materials were filtrated out, and the remaining filtrate was concentrated under reduced pressure to obtain p-methoxybenzyl 3-iodomethyl-7-[2-(2-tritylamino-4-thiazolyl)-2-{(1S)- diphenylmethoxycarbonyl-ethoxyimino}acetamido]-ceph-3-em-4-carboxylate-syn isomer. To this was added 24mg (0. 18mmol) of 1-ethyl-4-pyridothione, and the resulting mixture was dissolved in 1ml of chloroform at room temperature and reacted for 1 hour. After the reaction, the chloroform was distilled out under reduced pressure, and the residue was purified by silicagel-chromatography (chloroform/methanol=10/1) and dissolved in 0.2ml of anisole, and then, 1.5ml of trifluoroacetic acid was added thereto, while cooled with ice, and reacted for 1 hour. After the reaction, isopropylether was added to the reaction solution to form a precipitate therein. After dried, 93mg of a powder was obtained. To this was added 1ml of water and the pH value of the resulting solution was adjusted to 7.8 with sodium hydrogencarbonate, and the solution was purified with HP-20 resin (methanol/H₂O=1/4) to obtain 55mg of the above-entitled compound. ¹H-NMR (90MHz, D₂O, δppm) 1.46 (3H,d,J=6.8Hz), 1.55 (3H,t,J=7.2Hz), 3.43,3.73 (2H,ABq,J=18Hz), 4.27 (2H,s), 4.39 (2H,q,J=7.2Hz), 4.63 (1H,q,J=6.8Hz), 5.16 (1H,d,J=4.6Hz), 5.70 (1H,d,J=4.6Hz), 6.85 (1H,s), 7.77,8.37 (4H,ABq,J=6.6Hz) Example 9: (6R,7R)-7-[(Z)-2-(2-Aminothiazol-4-yl)-2-{(1R)-carboxyethoxyimino}acetamid]-3-(1-ethylpyridinium-4-ylthiomethyl)-ceph-3-em-4-carboxylate: 190mg (0.19mmol) of p-methoxybenzyl 3-chloromethyl-7-[2-(2-tritylamino-4-thiazolyl)-2-{(1R)-diphenylmethoxycarbonylethoxyimino}-acetamido]-ceph-3-em-4-carboxylate-syn isomer was dissolved in 3ml of acetone, and 0.1ml of acetone solution containing 43mg (0.29mmol) of sodium iodide was added to the resulting solution at room temperature and reacted for 40 minutes. After the reaction, the solvent was distilled out, methylene chloride was added to the residue, the insoluble materials were filtrated out, and the remaining filtrate was concentrated under reduced pressure, to obtain p-methoxybenzyl 3-iodomethyl-7-[2-(2-tritylamino-4-thiazolyl)-2-{(1R)-diphenylmethoxycarbonyl-ethoxyiminno}acetamido]-ceph-3-em-4-carboxylate-syn isomer. To this was added 27mg (0. 21mmol) of 1-ethyl-4-pyridothione, and the resulting mixture was dissolved in 3ml of chloroform and reacted for 1 hour at room temperature. After the reaction, the chloroform was distilled out under reduced pressure, and the residue was purified by silicagel-chromatography (chloroform/methanol=10/1) and dissolved in 0.2ml of anisole, and then, 2.0ml of trifluoroacetic acid was added thereto, while cooled with ice, and reacted for 1 hour. After the reaction, isopropylether was added to the reaction solution to form a precipitate therein. After dried, 100mg of a powder was obtained. To this was added 1ml of water and the pH value of the resulting solution was adjusted to 7.8 with sodium hydrogencarbonate, and the solution was purified with HP-20 resin (methanol/H₂O=1/4) to obtain 65mg of the above-entitled compound. ¹H-NMR (90MHz, D₂O, δppm) 1.43 (3H,d,J=6.8Hz), 1.53 (3H,t,J=7.1Hz), 3.45,3.73 (2H,ABq,J=17.1Hz), 4.26 (2H,s), 4.38 (2H,q,J=7.1Hz), 4.60 (1H,q,J=6.8Hz), 5.17 (1H,d,J=4.6Hz), 5.65 (1H,d,J=4.6Hz), 6.82 (1H,s), 7.77,8.34 (4H,ABq,J=6.8Hz) Example 10: (6R,7R)-7-[(Z)-2-(2-Aminothiazol-4-yl)-2-{(1S)-carboxyethoxyimino}acetamido]-3-[{1-(2,2,2-trifluoroethyl)pyridinium}-4-ylthiomethyl]-ceph-3-em-4-carboxylate: 100mg (0.098mmol) of p-methoxybenzyl 3-chloromethyl-7-[2-(2-tritylamino-4-thiazolyl)-2-{(1S)-diphenylmethoxycarbonylethoxyimino}acetamido]-ceph-3-em-4-carboxylate-syn isomer was dissolved in 1ml of acetone, and 0.5ml of acetone solution containing 29mg (0.20mmol) of sodium iodide was added to the resulting solution at room temperature and reacted for 40 minutes, After the reaction, the solvent was distilled out, methylene chloride was added to the residue, the insoluble materials were filtrated out, and the remaining filtrate was concentrated under reduced pressure, to obtain p-methoxybenzyl 3-iodomethyl-7-[2-(2-tritylamino-4-thiazolyl)-2-{(1S)-diphenylmethoxycarbonyl-ethoxyimino}acetamido]-ceph-3-em-4-carboxylate-syn isomer. To this was added 23mg (0. 12mmol) of 1-(2,2,2-trifluoroethyl)-4-pyridothione, and the resulting-mixture was dissolved in 1ml of chloroform and reacted for 1 hour at room temperature. After the reaction, the chloroform was distilled out under reduced pressure, and the residue was purified by silicagel-chromatography (chloroform/methanol=10/1) and dissolved in 0.34ml of anisole, and then, 1.13ml of trifluoroacetic acid was added thereto, while cooled with ice, and reacted for 1 hour. After the reaction, isopropylether was added to the reaction solution to form a precipitate therein. After dried, 73mg of a powder was obtained. To this was added 1ml of water and the pH value of the resulting solution was adjusted to 7.8 with sodium hydrogencarbonate, and the solution was purified with HP-20 resin (methanol/H20=1/4) to obtain 55mg of the above-entitled compound. ¹H-NMR (90MHz, D₂O,δppm) 1.58 (3H,d,J=6.6Hz), 3.56,3.88 (2H,ABq,J=18Hz), 4.46 (2H,s), 4.68-5.58 (3H,m), 5.33 (1H,d,J=4.5Hz), 5.86 (1H,d,J=4.5Hz), 7.05 (1H,s), 8.04,8.62 (4H,ABq,J=6.9Hz) Example 11: (6R,7R)-7-[(Z)-2-(2-Aminothiazol-4-yl)-2-{(1S)-carboxyethoxyimino}acetamido]-3-[{1-(2,2-difluoroethyl) pyridinium}-4-ylthiomethyl]-ceph-3-em-4-carboxylate: 140mg (0.14mmol) of p-methoxybenzyl 3-chloromethyl-7-[2-(2-tritylamino-4-thiazolyl)-2-{(1S)-diphenylmethoxycarbonylethoxyimino}acetamido]-ceph-3-em-4-carboxylate-syn isomer was dissolved in 1ml of acetone, and 0.5ml of acetone solution containing 30mg (0.2mmol) of sodium iodide was added to the resulting solution at room temperature and reacted for 40 minutes. After the reaction, the solvent was distilled out, methylene chloride was added to the residue, the insoluble materials were filtrated out, and the remaining filtrate was concentrated under reduced pressure, to obtain p-methoxybenzyl 3-iodomethyl-7-[2-(2-tritylamino-4-thiazolyl)-2-{(1S)-diphenylmethoxycarbonylethoxyimino}acetamido]-ceph-3-em-4-carboxylate-syn isomer. To this was added 30mg (0. 17mmol) of 1-(2,2-difluoroethyl)-4-pyridothione, and the resulting mixture was dissolved in 1ml of chloroform and reacted for 1 hour at room temperature. After the reaction, the chloroform was distilled out under reduced pressure, and the residue was purified by silicagel-chromatography (chloroform/methanol=10/1) and dissolved in 0.4ml of anisole, and then, 2.0ml of trifluoroacetic acid was added thereto, while cooled with ice, and reacted for 1 hour. After the reaction, isopropylether was added to the reaction solution to form a precipitate therein. After dried, 110mg of a powder was obtained. To this was added 1ml of water and the pH value of the resulting solution was adjusted to 7.8 with sodium hydrogencarbonate, and the solution was purified with HP-20 resin (methanol/H₂0=1/4) to obtain 55mg of the above-entitled compound. ¹H-NMR (90MHz, D₂O, δppm) 1.50 (3H,d,J=7.0Hz), 3.50,3.80 (2H,ABq,J=18Hz), 4.40 (2H,s), 4.60-5.55 (4H,m), 5.25 (1H,d,J=4.5Hz), 5.80 (1H,d,J=4.5Hz), 7.03 (1H,s), 7.94,8.52 (4H,ABq,J=6.9Hz) Example 12: Preparation for injection: A sterilized injection containing 1000mg (titer) of the compound of the Example 3 was filled in one vial. Example 13: Capsules: Compound of Example 3 250 parts (titer) Lactose 60 parts Magnesium stearate 5 parts These were uniformly blended, and the resulting mixture was encapsulated in an amount of 250mg (titer) /capsule. Example 14: Soft capsules for rectal application: 25 parts (titer) of the compound of the Example 3 were added to a uniform base comprising: Olive oil 160 parts Polyoxyethylene-laurylether 10 parts Sodium hexametaphosphate 5 parts. The resulting mixture was uniformly blended and encapsulated to obtain soft capsules for rectal application each containing 250mg (titer)/capsule.

Claims: Cephalosporin derivatives of a general formula (I) and non-toxic salts and non-toxic esters thereof: (wherein R represents an acyclic or cyclic lower alkyl group having up to 6 carbon atoms, which may optionally be substituted by a halogen atom; the steric configuration as asterisked (*) includes an optical-active (R)-form or (S)-form or an optical-inactive (RS)-form; and n is 0 or 1, X is CH₃, CH₂F, CHF₂ or CF₃). (6R,7R)-7-{(Z)-2-(2-aminothiazol-4-yl)-2-(1-carboxyethoxyimino)acetamido}-3-[{1-(2-fluoroethyl) pyridinium}-4-ylthiomethyl}-ceph-3-em-4-carboxylate. (6R,7R)-7-[(Z)-2-(2-aminothiazol-4-yl)-2-{(1R)-carboxyethoxyimino}acetamido]-3-[{1-(2-fluoroethyl) pyridinium}-4-ylthiomethyl]-ceph-3-em-4-carboxylate. (6R,7R)-7-[(Z)-2-(2-aminothiazol-4-yl)-2-{(1S)-carboxyethoxyimino}acetamido]-3-[{1-(2-fluoroethyl) pyridinium}-4-ylthiomethyl]-ceph-3-em-4-carboxylate. (6R,7R)-7-{(Z)-2-(2-aminothiazol-4-yl)-2-(1-carboxypropyloxyimino)acetamido}-3-[{1-(2-fluoroethyl) pyridinium}-4-ylthiomethyl]-ceph-3-em-4-carboxylate. (6R,7R)-7-{(Z)-2-(2-aminothiazol-4-yl)-2-(1-carboxy-1-cyclohexylmethoxyimino)acetamido}-3-[{1-(2-fluoroethyl)pyridinium}-4-ylthiomethyl]-ceph-3-em-4-carboxylate. (6R,7R)-7-{(Z)-2-(2-aminothiazol-4-yl)-2-(1-carboxy-2-fluoroethoxyimino)acetamido}-3-[{1-(2-fluoroethyl)pyridinium}-4-ylthiomethyl]-ceph-3-em-4-carboxylate. (6R,7R)-7-[(Z)-2-(2-aminothiazol-4-yl)-2-{(1S)-carboxyethoxyimino}acetamido]-3-(1-methylpyridinium-4-ylthiomethyl)-ceph-3-em-4-carboxylate. (6R,7R)-7-[(Z)-2-(2-aminothiazol-4-yl)-2-{(1S)-carboxyethoxyimino)acetamido]-3-(1-ethylpyridinium-4-ylthiomethyl)- ceph-3-em-4-carboxylate. (6R,7R)-7-[(Z)-2-(2-aminothiazol-4-yl)-2-{(1R)-carboxyethoxyimino}-acetamido-3-(1-ethylpyridinium-4-ylthiomethyl)-ceph-3-em-4-carboxylate. (6R,7R)-7-[(Z)-2-(2-aminothiazol-4-yl)-2-{(1S)-carboxyethoxyimino}acetamido]-3-[{1-(2,2,2-trifluoroethyl)-pyridinium)-4-ylthiomethyl]-ceph-3-em-4-carboxylate. (6R,7R)-7-[(Z)-2-(2-aminothiazol-4-yl)-2-{(1S)-carboxyethoxyimin}acetamido]-3-[{1-(2,2-difluoroethyl) pyridinium-4-ylthiomethyl]-ceph-3-em-4-carboxylate. A bactericide containing an active ingredient selected from cephalosporin derivatives of a general formula (I) and non-toxic salts and non-toxic esters thereof: (wherein R represents an acyclic or cyclic lower alkyl group having up to 6 carbon atoms, which may optionally be substituted by a halogen atom; the steric configuration as asterisked (*) includes an optical-active (R)-form or (S)-form or an optical-inactive (RS)-form; and n is 0 or 1, X is CH₃, CH₂F, CHF₂ or CF₃). The bactericide as claimed in claim 13, which contains an active ingredient of the compound as claimed in anyone of claims 2-12.

Inventors: KONDO, SHINICHI ROOM 801, ICHIGAO ANNEX, KUDO, TOSHIAKI, MURAI, YASUSHI, NISHIHATA, KEN, OKONOGI, TSUNEO, SHIBAHARA, SEIJI, YOSHIDA, TAKASHI
Applicants: MEIJI SEIKA KAISHA LTD., MITSUHASHI, SUSUMU
Application year: 1986
Main classification: C07D501
IPC codes: A61P31, A61K31, C07D501