Cephem derivatives

The invention relates to new amino acid derivatives and to processes for the preparation of the same.
Applicants have found, surprisingly, that, in general, the N-terminal amino group of an amino carboxylic acid, which is stable in acid medium, can react with a ketone in acid medium to form a (cyclo)alkylideneammonio group.
Therefore, in accordance with the present invention, there is provided a new compound which is an amino carboxylic acid derivative comprising, as an N-terminal group, a (cyclo)alkylideneammonio group of formula II ##STR2## wherein X is an anion from an acid HX,
R.sub.1 and R.sub.2 are the same or different and each is a C.sub.1 -C.sub.16 alkyl group or R.sub.1 and R.sub.2, together with the carbon atom to which they are attached, form a cycloalkylidene ring with up to 8 carbon atoms, with the proviso that the compound is not 7.beta.-(cyclo)alkylideneammonio-3-halomethyl-3-cephem-4-carboxylic acid.
In particular, compounds of the invention include .beta.-lactam derivatives and more in particular those of formula (I): ##STR3## wherein ##STR4## R.sub.3 is hydrogen, (lower)alkoxy, (lower)alkylthio, (lower)alkanoyloxy, (lower)alkanoylthio or S--R.sub.4, where R.sub.4 is an optionally substituted heterocyclic ring,
R.sub.3 ' is (lower)alkylidene,
n is 0, 1 or 2 and
R.sub.1, R.sub.2 and X are as defined above.
Preferred compounds of formula (I) include those wherein
W is ##STR5## where R.sub.3 is hydrogen, acetoxy, (1-methyl-1H-tetrazol-5-yl)thio and n is 0 or 1 or
W is ##STR6## and n is 2, X is Cl.sup.--, Br.sup.--, I.sup.--, ClO.sub.4.sup.--, HSO.sub.4.sup.-- CH.sub.3 COO.sup.--, and
R.sub.1 is methyl, R.sub.2 is methyl or R.sub.1 and R.sub.2 together with the carbon atom to which they are attached form cyclopentylidene or cyclohexylidene.
Furthermore, a process is provided for the preparation of an amino carboxylic acid derivative wherein the N-terminal amine group of an amino carboxylic acid is converted into a group of formula (II) as defined above by adding a ketone R.sub.1 R.sub.2 CO to the amino carboxylic acid in the presence of an acid HX, R.sub.1, R.sub.2 and X being as defined for formula (II) above. Any amino carboxylic acid which is stable in acid medium can be used as starting material.
In one embodiment of the invention a new compound which is an amino carboxylic acid derivative as defined above in accordance with the invention is prepared by deprotecting an N-protected amino carboxylic acid in a manner known per se and then by adding a ketone R.sub.1 R.sub.2 in situ. The N-protected amino carboxylic acid is an amino carboxylic acid bearing any conventional protected amino group at its N-terminus.
In particular, a process is provided for the preparation of an amino acid derivative of formula (I), as defined above, from an amino carboxylic acid of the following formula (III): ##STR7## wherein W and n are as defined above in general formula (I),
and A is a protected amino group, by carrying out the following successive steps:
(a) silylating the starting amino carboxylic acid, optionally in situ,
(b) converting the product of step (a) into an imidoyl chloride,
(c) reacting the imidoyl chloride with an alcohol to form the corresponding iminoether and/or the 7-amino derivative, and
(d) adding a ketone R.sub.1 R.sub.2 CO.
The silylation of step (a) is achieved by any suitable known procedure to split off side chains in cephem and penem compounds, for example by treating the starting amino carboxylic acid with trimethylchloro silane or dimethyldichloro silane, and a base like for instance N,N-dimethylaniline, pyridine or quinoline, in methylene chloride. Step (b) is also carried out by any suitable known method such as treatment with phosphorus pentachloride at a low temperature, for example -70.degree. C. to +5.degree. C. In step (c) the imidoyl chloride may be reacted with any alcohol, suitable examples of which include methanol, ethanol, isobutanol and 1,3-propanediol.
In one embodiment all four steps are performed in the same reaction vessel without isolation of the intermediate products. It is alternatively possible to separate the product of one step before performing the next step. All four reaction steps are carried out at a temperature in the range from -80.degree. C. to +150.degree. C., preferably from -60.degree. C. to +100.degree. C.
As used herein, the terms lower alkyl and (lower)alkyl refer to an alkyl group with up to 8 carbon atoms. By R.sub.n-n+m is meant: R.sub.n, R.sub.n+1 . . . R.sub.n+m. The (cyclo)alkylideneammonio group can alternatively be referred to as a (cyclo)alkylideneiminium group.
The term amino carboxylic acid as used herein refers to a compound comprising at least a primary amino group and a carboxylic acid group. If the primary amino group has been N-protected, the protective group can be hydrolyzed in conventional fashion. Conversion to an N-(cyclo)alkylideneammonio group can then be effected by adding a ketone.
If necessary, an acid medium can be created by the addition of any inorganic or organic acid. The acid is typically added as a con-centrated solution. Suitable acids include hydrogen chloride, hydrogen, bromide, hydrogen iodide, sulfuric acid, perchloric acid and acetic acid.
When R.sub.3 is the group S--R.sub.4, the hetercyclic ring R.sub.4 is suitable pyridine, pyrimidine, pyridazine, pyrrole, imidazole, pyrazole, isoxazole, isothiazole, thiazole, triazole, oxadiazole, thiadiazole, triazine, thiatriazole or tetrazole linked by a ring carbon atom to the sulfur atom. The heterocyclic ring R.sub.4 is unsubstituted or substituted on a ring carbon atom, examples of suitable substituents including optionally substituted lower alkyl, cyano, chloro, di(lower)-alkylamino, (lower)alkyloxy such as methoxy, (lower)alkyloxycarbonyl, di(lower)alkylcarbamoyl, hydroxy, sulfo and carboxy. One or more ring nitrogen atoms of the heterocyclic group R.sub.4 can be substituted by an optionally substituted lower alkyl. Examples of suitable substituents attached to the first or the second carbon atom of a lower alkyl group attached either to a ring carbon or ring nitrogen atom of the heterocyclic ring R.sub.4 include di(lower)alkylamino, chloro, cyano, methoxy, (lower)alkyloxycarbonyl, N,N-dimethylcarbamoyl, hydroxy, carboxy and sulfo.
Conventional "protected amino groups" as used in this specification include amino groups of the formula ##STR8## which can by introduced by cephalosporin and penicillin fermentation, R.sub.5 being an optionally substituted methyl group --CH.sub.2 R.sub.6 which can be introduced by penicillin fermentation and wherein R.sub.6 is hydrogen, aryl, alkyl, cycloalkyl, alkenyl, aryloxy arylthio, alkylthio, etc., or R.sub.5 is an optionally substituted aryl group.
The present invention provides a new and general method of protecting an amino group as a (cyclo)alkylideneammonio group, which is a powerful means in synthesis wherein amino carboxylic acids have to be protected. Compounds of the invention are therefore useful as synthetic intermediates.
Among these compounds .beta.-lactam derivatives are valuable as intermediates in the preparation of various therapeutically useful antibiotics. For instance, 3-acetoxymethyl-4-carboxy-7-(cyclo)alkylideneammonio-3-cephem bromide compounds of the invention may be converted into 7-amino-3-substituted methyl-3-cephem-4-carboxylic acid derivatives such as 7-amino-3-[[1-methyl-1H-tetrazol-5-yl)thio]methyl]-3-cephem-4-carboxylic acid and 7-ammonio-4-carboxy-3-[1-pyridinio)methyl]-3-cephem diiodide.
The following Examples further illustrate the invention.
Examples I-IX show the preparation of certain new (cyclo)alkylideneammonio-3-acetoxymethyl-3-cephem compounds and Examples X-XV the preparation of certain new (cyclo)alkylideneammonio-3-methyl-3-cephem compounds.
Examples XVI-XVIII illustrate the preparation of new (cyclo)alkylideneammonio-3-[[(1-methyl-1H-tetrazol-5-yl)thio]methyl]-3-cephem derivatives and Examples XIX-XXI the preparation of new (cyclo)alkylideneammonio-3-vinyl-3-cephem derivatives.
Example XXII shows the preparation of a (cyclo)alkylidene-1-oxo-3-cephem, Example XXXIII of a (cyclo)alkylideneammonio-1,1-dioxo-penam, Example XXIV of a (cyclo)alkylideneammonio-2-cepham, Example XXV of a (cyclo)alkylidene-3-methylene-cepham and Example XXVI of a (cyclo)alkylidene-.beta.-alaninium derivative.
The Examples XXVII-XXX show "one-pot" syntheses of (cyclo)alkylideneammonio-3-cephem compounds from corresponding protected amino-3-cephem compounds.
Finally, Examples XXXI and XXXII illustrate the conversion of these new (cyclo)alkylideneammonio compounds into the corresponding amino derivatives. EXAMPLE I
Preparation of 3-acetoxymethyl-4-carboxy-7-isopropylideneammonio-3-cephem chloride from 7-amino-3-acetoxymethyl-3-cephem-4-carboxylic acid
After addition of 20.0 g (purity 90%; 70.5 mmoles) of 7-amino-3-acetoxymethyl-3-cephem-4-carboxylic acid to 50 ml of acetic acid saturated with hydrochloric acid at 20.degree. C. a clear solution was obtained in about 3 minutes. Then 110 ml of acetone were added, the mixture was cooled down and a white precipitate was formed. After stirring for another 30 minutes and adding 80 ml of acetone the precipitate was filtered off, washed with acetone and dried giving 26.5 g (purity 90%) of the title product. Yield 97%.
IR (KBr-disc, values in cm.sup.-1): 3000, 2820, 2570, 1980, 1785, 1720, 1665, 1635, 1500, 1380, 1340, 1225, 1160, 1115, 1035, 975, 920, 875, 810, 720, 700, 440. NMR (360 MHz; CF.sub.3 COOD; tetramethylsilane as a reference; .delta.-values in ppm): 1.99 (s, 3H); 2.52 (s, 3H); 2.62 (s, 3H); 3.45, 3.55 (AB-q, 2H; J=18 Hz); 4.98, 5.20 (AB-q, 2H; J=14.4 Hz); 5.27 (d, 1H; J=4.6 Hz); 5.84 (d, 1H; J=4.6 Hz).
EXAMPLE II
Preparation of 3-acetoxymethyl-4-carboxy-7-isopropylideneammonio-3-cephem bromide from 7-amino-3-acetoxymethyl-3-cephem-4-arboxylic acid
To a mixture of 1.0 g (purity 97%; 3.56 mmoles) of 7-amino-3-acetoxymethyl-3-cephem-4-carboxylic acid and 0.8 ml of a HBr solution in acetic acid (33%), 5 ml of acetone were added gradually. The precipitate formed was filtered off, washed with acetone and dried, giving 0.85 g of the title product.
IR (KBr-disc, values in cm.sup.-1): 3185, 3050, 2940, 2905, 2715, 1795, 1735, 1710, 1665, 1625, 1520, 1415, 1405, 1375, 1335, 1230, 1215, 1195, 1165, 1110, 1060, 1040, 975, 920, 820, 790, 720, 700, 440. NMR (360 MHz; CF.sub.3 COOD; tetramethylsilane as a reference; .delta.-values in ppm): 1.99 (s, 3H); 2.53 (s, 3H); 2.63 (s, 3H); 3.49, 3.56 (AB-q, 2H; J=18 Hz); 5.00, 5.19 (AB-q, 2H; J=14.4 Hz); 5.33 (d, 1H; J=4.6 Hz); 5.88 (d, 1H; J=4.6 Hz).
EXAMPLE III
Preparation of 3-acetoxymethyl-4-carboxy-7-isopropylideneammonio-3-cephem bromide from 7-amino-3-acetoxymethyl-3-cephem-4-carboxylic acid
To a suspension of 10.0 g (purity 96%; 35.3 mmoles) of 7-amino-3-acetoxymethyl-3-cephem-4-carboxylic acid in 100 ml of acetone and 20 ml of acetic acid, 6.7 ml of a HBr solution in water (47%) were added. After stirring for 210 minutes at 0.degree. C. the precipitate formed was filtered off, washed with acetone and dried in vacuo, giving 10.77 g (purity 100%) of the title product. Yield 77%.
EXAMPLE IV
Preparation of 3-acetoxymethyl-4-carboxy-7-isopropylideneammonio-3-cephem bromide from 7-amino-3-acetoxymethyl-3-cephem-4-carboxylic acid
To a suspension of 10.0 g (purity 96%; 35.5 mmoles) of 7-amino-3-acetoxymethyl-3-cephem-4-carboxylic acid in 50 ml of acetone, 9.8 ml of a HBr solution in acetic acid (33%) were added at 0.degree. C. during 5 minutes. After stirring for 60 minutes at 0.degree. C. the precipitate formed was filtered off, washed with acetone (3.times.25 ml) and dried in vacuo, giving 13.7 g (purity 93%) of the title product. Yield 91%.
EXAMPLE V
Preparation of 3-acetoxymethyl-4-carboxy-7-isopropylideneammonio-3-cephem iodide from 7-amino-3-acetoxymethyl-3-cephem-4-carboxylic acid
To a suspension of 5 g (17.9 mmoles) of 7-amino-3-acetoxymethyl-3-cephem-4-carboxylic acid in a mixture of 10 ml of acetone and 5 ml of acetic acid, 4.0 ml of a hydrogen iodide solution in water (57%) were added. After stirring for about 90 minutes at 0.degree. C., the crystals formed were filtered off, washed with acetone and dried giving 2.69 g of the title product.
IR (KBr-disc, values in cm.sup.-1): 3180, 3040, 2900, 2760, 1795, 1740, 1715, 1675, 1630, 1510, 1415, 1400, 1380, 1230, 1205, 1165, 1115, 1065, 1045, 975, 920, 840, 815, 785, 715, 700, 440. NMR (360 MHz; CF.sub.3 COOD; tetramethylsilane as a reference; .delta.-values in ppm): 1.99 (s, 3H); 2.53 (s, 3H); 2.64 (s, 3H); 3.50, 3.57 (AB-q, 2H; J=18 Hz); 5.00, 5.19 (AB-q, 2H; J=14.4 Hz); 5.35 (d, 1H; J=4.6 Hz); 5.89 (d, 1H; J=4.6 Hz).
EXAMPLE VI
Preparation of 3-acetoxymethyl-4-carboxy-7-cyclopentylideneammonio-3-cephem bromide from 7-amino-3-acetoxymethyl-3-cephem-4-carboxylic acid
In a centrifuge tube 0.8 ml of a hydrogen bromide solution (33%) in acetic acid was added to 1.0 g (purity 96%; 3.53 mmoles) of 7-amino-3-acetoxymethyl-3-cephem-4-carboxylic acid at 0.degree. C. with stirring. After adding gradually 5 ml of cyclopentanone a crystalline precipitate was obtained after 30 minutes, which was filtered off, washed with acetone and cyclopentanone, and dried giving 1.17 g (80%) of the title product.
IR (KBr-disc, values in cm.sup.-1): 3180, 3000, 2900, 2630, 1795, 1740, 1715, 1680, 1630, 1500, 1415, 1380, 1340, 1235, 1210, 1160, 1110, 1070, 1045, 975, 920, 825, 790, 715, 455. NMR (360 MHz; CF.sub.3 COOD; tetramethylsilane as a reference; .delta.-values in ppm): 2.02 (s, 3H); 2.02 (m, 4H); 3.02 (m, 4H); 3.52 and 3.58 (AB-q, 2H; J=18.4 Hz); 5.01, 5.23 (AB-q, 2H; J=14.1 Hz); 5.31 (d, 1H; J=4.3 Hz); 5.75 (d, 1H; J=4.3 Hz).
EXAMPLE VII
Preparation of 3-acetoxymethyl-4-carboxy-7-cyclohexylideneammonio-3-cephem chloride from 7-amino-3-acetoxymethyl-3-cephem-4-carboxylic acid
A mixture of 165 mg (0.606 mmole) of 7-amino-3-acetoxymethyl-3-cephem-4-carboxylic acid, 0.08 ml of a concentrated HCl solution and 0.10 ml (0.96 mmole) of cyclohexanone was stirred vigorously in an ultrasonic bath for 15 minutes. During the next 80 minutes more cyclohexanone (0.2 ml) was added in 2 portions. Collection and washing of the precipitate with acetonitrile and ether afforded 197 mg (84%) of the title product.
IR (KBr-disc; values in cm.sup.-1): 3440, 1804, 1731, 1715, 1656, 1620, 1525, 1418, 1380, 1229, 1065, 1039, 876, 721 and 704. NMR (360 MHz; CF.sub.3 COOD; tetramethylsilane as a reference; .delta.-values in ppm): 1.66 (m, 2H); 1.92 (m, 4H); 1.99 (s, 3H); 2.77 (m, 4H); 3.45 and 3.57 (2.times.d, 2H; J=18.0 Hz); 4.99 and 5.19 (2.times.d, 2H; J=14.4 Hz); 5.27 (d, 1H; J=4.4 Hz); 5.87 (d, 1H; J=4.4 Hz).
EXAMPLE VIII
Preparation of 3-acetoxymethyl-4-carboxy-7-cyclohexylideneammonio-3-cephem bromide from 7-amino-3-acetoxymethyl-3-cephem-4-carboxylic acid
To 165 mg (purity 96%; 0.58 mmole) of 3-acetoxymethyl-7-amino-cephem-carboxylate was added 0.12 ml of a concentrated HBr solution and 0.1 ml of cyclohexanone at 0.degree. C. with vigorous stirring. When stirring was continued initially a clear reaction mixture was obtained but after some time a thick crystalline precipitate was formed. After adding 0.5 ml of cyclohexanone and stirring for another 30 minutes the crystalline precipitate was filtered off and dried giving 234 mg of the title product with a purity of 93%. Yield 92%.
IR (KBr-disc; values in cm.sup.-1): 3440, 2945, 2850, 1810, 1731, 1651, 1625, 1510, 1417, 1230, 1196, 1067, 1041, 833 and 702. NMR (360 MHz; CF.sub.3 COOD; tetramethylsilane as a reference; .delta.-values in ppm): 1.70 (m, 2H); 1.93 (m, 4H); 1.99 (s, 3H); 2.69 (m, 4H); 3.28 and 3.36 (2.times.d, 2H; J=17 Hz); 4.57 and 4.74 (2.times.d, 2H; J=12 Hz); 4.85 (d, 1H; J=4.5 Hz); 5.36 (d, 1H; J=4.5 Hz).
EXAMPLE IX
Preparation of 3-acetoxymethyl-4-carboxy-7-cyclohexylideneammonio-3-cephem hydrogen sulphate from 7-amino-3-acetoxymethyl-3-cephem-4-carboxylic acid
To a solution of 1.0 g (3.53 mmoles) of 7-amino-3-acetoxy methyl-3-cephem-4-carboxylic acid in 5 ml of acetic acid and 0.2 ml of sulphuric acid were added 5 ml of cyclohexanone. After standing overnight at 2.degree. C. the crystalline precipitate formed was filtered off, washed with cyclohexanone and acetone and dried in vacuo yielding 1.41 g (89%) of the title product.
IR (KBr-disc, values in cm.sup.-1): 2960, 2880, 1810, 1725, 1710, 1665, 1535, 1410, 1390, 1360, 1310, 1280, 1230, 1165, 1050, 980, 850, 710, 580, 440. NMR (360 MHz; CF.sub.3 COOD; tetramethylsilane as a reference; .delta.-values in ppm): 1.68 and 1.94 (m, 6H); 2.02 (s, 3H); 2.79 (m, 4H); 3.45 and 3.61 (AB-q, 2H; J=17.7 Hz); 5.01, 5.20 (AB-q, 2H; J=14.1 Hz); 5.31 (d, 1H; J=4.3 Hz); 5.90 (d, 1H; J=4.3 Hz).
EXAMPLE X
Preparation of 4-carboxy-7-isopropylideneammonio-3-methyl-3-cephem chloride from 7-amino-3-methyl-3-cephem-4-carboxylic acid
To a mixture of 1.0 g (purity 98%; 4.57 mmoles) of 7-amino-3-methyl-3-cephem-4-carboxylic acid and 2.5 ml of acetic acid saturated with hydrogen chloride, 3 ml of acetone were gradually added with vigorous stirring. After stirring for 10 minutes another 5 ml of acetone were added, the reaction mixture was stored in the refrigerator for 2 hours and the precipitate formed was filtered off, washed with acetone and dried, giving 1.26 g of the title product with a purity of 100% according to NMR assay. Yield 95%.
IR (KBr-disc, values in cm.sup.-1): 3010, 2660, 1985, 1780, 1720, 1665, 1625, 1535, 1415, 1395, 1365, 1285, 1205, 1185, 1115, 1080, 1050, 1000, 970, 955, 910, 880, 800, 740, 715, 690, 565, 510. NMR (360 MHz; CF.sub.3 COOD; tetramethylsilane as a reference; .delta.-values in ppm): 2.18 (s, 3H); 2.51 (s, 3H); 2.62 (s, 3H); 3.24, 3.33 (AB-q, 2H; J=18 Hz); 5.25 (d, 1H; J=4.3 Hz); 5.71 (d, 1H; J=4.3 Hz).
EXAMPLE XI
Preparation of 4-carboxy-7-isopropylideneammonio-3-methyl-3-cephem chloride from 7-amino-3-methyl-3-cephem-4-carboxylic acid
With stirring 1.0 g (purity 98%; 4.57 mmoles) of 7-amino-3-methyl-3-cephem-4-carboxylic acid was added to a mixture of 10 ml of acetic acid, 10 ml of acetone and 0.45 ml of a HCl solution in water (37%) at 0.degree. C. Stirring for 45 minutes, filtration of the precipitate formed, washing with acetone and drying yielded 1.16 g (87%) of the title product.
EXAMPLE XII
Preparation of 4-carboxy-7-isopropylideneammonio-3-methyl-3-cephem bromide from 7-amino-3-methyl-3-cephem-4-carboxylic acid
To a mixture of 1.0 g (purity 98%; 4.57 mmoles) of 7-amino-3-methyl-3-cephem-4-carboxylic acid and 0.9 ml of a 33% of a solution of HBr in acetic acid (33%) 6 ml of acetone was added. This mixture was stirred vigorously for 25 minutes while crystals were formed. Filtration, washing with acetone and drying yielded 1.18 g of the title product.
IR (KBr-disc, values in cm.sup.-1): 3120, 2820, 2740, 1785, 1725, 1660, 1630, 1525, 1395, 1365, 1285, 1205, 1185, 1115, 1080, 1050, 965, 955, 910, 865, 805, 780, 715, 690, 565, 505. NMR (360 MHz; CF.sub.3 COOD; tetramethylsilane as a reference; .delta.-values in ppm): 2.18 (s, 3H); 2.52 (s, 3H); 2.64 (s, 3H); 3.21, 3.37 (AB-q, 2H; J=18 Hz); 5.28, (d, 1H; J=4.3 Hz); 5.75 (d, 1H; J=4.3 Hz).
EXAMPLE XIII
Preparation of 4-carboxy-7-isopropylideneammonio-3-methyl-3-cephem bromide from 7-amino-3-methyl-3-cephem-4-carboxylic acid
To a suspension of 1.0 g (purity 98.5%; 4.60 mmoles) of 7-amino-3-methyl-3-cephem-4-carboxylic acid in a mixture of 10 ml of acetic acid and 15 ml of acetone, 0.86 ml of hydrogen bromide solution in water (47%) was added. After filtering off the white crystals formed, washing and drying, 1.47 g of the title product was obtained with a purity of 96%. Yield 92%.
EXAMPLE XIV
Preparation of 4-carboxy-7-cyclohexylideneammonio-3-methyl-3-cephem bromide from 7-amino-3-methyl-3-cephem-4-carboxylic acid
To a solution of 500 mg (2.33 mmoles) of 7-amino-3-methyl-3-cephem-4-carboxylic acid in 0.45 ml of a concentrated HBr solution (47%), 0.50 ml of cyclohexanone was added at ambient temperature. After 20 minutes crystallization started and then during the next 6 hours 2.0 ml of cyclohexanone were added in portions. After standing overnight, the crystals formed were filtered off, washed and dried, yielding 590 mg (67%) of the title product.
IR (KBr-disc, values in cm.sup.-1): 3430, 2870, 1796, 1709, 1658, 1630, 1517, 1401, 1354, 1214, 1195, 828, 705. NMR (360 MHz; CF.sub.3 COOD; tetramethylsilane as a reference; .delta.-values in ppm): 1.63 (m, 2H); 1.92 (m, 4H); 2.17 (s, 3H); 2.78 (m, 4H); 3.25 (d, 1H; J=16.2 Hz); 3.38 (d, 1H; 16.2 Hz); 5.28 (d, 1H; J=4.5 Hz); 5.78 (d, 1H; J=4.5 Hz).
EXAMPLE XV
Preparation of 4-carboxy-7-cyclohexylideneammonio-3-methyl-3-cephem perchlorate from 7-amino-3-methyl-3-cephem-4-carboxylic acid
In an ultrasonic bath 130 mg (0.61 mmole) of 7-amino-3-methyl-3-cephem-4-carboxylic acid was dissolved in 0.175 ml of a perchloric acid solution at 0.degree. C. and 0.1 ml of cyclohexanone was added over a period of 30 minutes. After another 30 minutes the crystals were filtered off, washed and dried, giving 171 mg (71%) of the title product.
IR (KBr-disc, values in cm.sup.-1): 3430, 3205, 3110, 3010, 1790, 1716, 1658, 1635, 1521, 1410, 1357, 1218, 1196, 1140, 1100, 1050, 835, 703, 621. NMR (360 MHz; CF.sub.3 COOD; tetramethylsilane as a reference; .delta.-values in ppm): 1.58 (m, 2H); 1.87 (m, 4H); 2.13 (s, 3H); 2.73 (m, 4H); 3.21 (s, 2H); 5.20 (d, 1H; J=4.5 Hz); 5.67 (d, 1H; J=4.5 Hz).
EXAMPLE XVI
Preparation of 4-carboxy-7-isopropylideneammonio-3-[[(1-methyl-1H-tetrazol-5-yl)thio]methyl]-3-cephem chloride from 7-amino-3-[[(1-methyl-1H-tetrazol-5-yl)thio]methyl]-3-cephem-4-carboxylic acid
To 2 ml of acetic acid saturated with hydrochloric acid 1 g (purity 95%; 2.9 mmoles) of 7-amino-3-[[(1-methyl-1H-tetrazol-5-yl)thio]methyl]-3-cephem-4-carboxylic acid and 3 ml of acetone were added at about 5.degree. C. After stirring at 0.degree. C. for 40 minutes the crystalline material was filtered off, washed with acetone and dried giving 1.1 g of the title compound.
IR (KBr-disc, values in cm.sup.-1): 2950, 2910, 2830, 1800, 1715, 1655, 1625, 1525, 1470, 1405, 1350, 1250, 1235, 1180, 1110, 1060, 835, 710, 695. NMR (360 MHz; CF.sub.3 COOD; tetramethylsilane as a reference; .delta.-values in ppm): 2.52 (s, 3H); 2.62 (s, 3H); 3.63, 3.74 (AB-q, 2H; J=18 Hz); 3.97 (s, 3H); 4.01, 4.51 (AB-q, 2H; J=13.2 Hz); 5.32 (d, 1H; J=4.3 Hz); 5.83 (d, 1H; J=4.3 Hz).
EXAMPLE XVII
Preparation of 4-carboxy-7-isopropylideneammonio-3-[[(1-methyl-1H-tetrazol-5-yl)thio]methyl]-3-cephem bromide from 7-amino-3-[[(1-methyl-1H-tetrazol-5-yl)thio]methyl]-3-cephem-4-carboxylic acid
1 g (purity 95%; 2.9 mmoles) of 7-amino-3-[[(1-methyl-1H-tetrazol-5-yl)thio]methyl]-3-cephem-4-carboxylic acid was added to 0.8 ml of a hydrogen bromide solution (33%) in acetic acid at 0.degree. C. Gradually 10 ml of acetone were added and stirring was continued for 30 minutes at 0.degree. C. After filtration, washing the crystals and drying 1.14 g of the final product was obtained.
IR (KBr-disc, values in cm.sup.-1): 3180, 2945, 2900, 2730, 1795, 1720, 1655, 1625, 1515, 1455, 1395, 1370, 1345, 1230, 1175, 1105, 1055, 995, 930, 820, 770, 705. NMR (360 MHz; CF.sub.3 COOD; tetramethylsilane as a reference; .delta.-values in ppm): 2.52 (s, 3H); 2.64 (s, 3H); 3.64, 3.76 (AB-q, 2H; J=18 Hz); 3.97 (s, 3H); 4.06, 4.57 (AB-q, 2H; J=13.2 Hz); 5.37 (d, 1H; J=4.3 Hz); 5.85 (d, 1H; J=4.3 Hz).
EXAMPLE XVIII
Preparation of 4-carboxy-7-isopropylideneammonio-3-[[(1-methyl-1H-tetrazol-5-yl)thio]methyl]-3-cephem bromide from 7-amino-3-[[(1-methyl-1H-tetrazol-5-yl)thio]methyl]-3-cephem-4-carboxylic acid
To a suspension of 1.0 g (2.9 mmoles) of 7-amino-3-[[(1-methyl-1H-tetrazol-5-yl)thio]methyl]-3-cephem-4-carboxylic acid in 7 ml of acetone, 0.81 ml of a HBr solution in acetic acid (33%) was added. The reaction mixture was stirred for 30 minutes at 0.degree. C. and stored overnight in the refrigerator. Filtration, washing with acetone and drying off the precipitate gave 1.35 g of the title product.
EXAMPLE XIX
Preparation of 4-carboxy-7-isopropylideneammonio-3-vinyl-3-cephem chloride from 7-amino-3-vinyl-3-cephem-4-carboxylic acid
To 0.5 g (2.1 mmoles) of 7-amino-3-vinyl-3-cephem-4-carboxylic acid 2 ml of acetic acid with 7% of hydrochloric acid were added. With stirring a yellow solution was obtained, which solidified gradually. After adding 5 ml of acetone the precipitate dissolved and then a crystalline product was formed. Stirring was continued for 30 minutes at 0.degree. C. and the crystals were filtered off, washed with acetone and dried, giving 0.62 g (98%) of the title product.
IR (KBr-disc, values in cm.sup.-1): 2980, 2820, 2500, 2000, 1780, 1710, 1660, 1420, 1400, 1370, 1350, 1200, 1175, 1150, 1130, 1060, 995, 935, 845, 720, 695. NMR (360 MHz; CF.sub.3 COOD; tetramethylsilane as a reference; .delta.-values in ppm): 2.50 (s, 3H); 2.60 (s, 3H); 3.46, 3.52 (AB-q, 2H; J=18 Hz); 5.28 (d, 1H; J=4.3 Hz); 5.48 (d, 1H; J=10.8 Hz); 5.62 (d, 1H; J=16.8 Hz); 5.74 (d, 1H; J=4.3 Hz); 7.27 (dd, 1H; J=10.8 and 16.8 Hz).
EXAMPLE XX
Preparation of 4-carboxy-7-isopropylideneammonio-3-vinyl-3-cephem bromide from 7-amino-3-vinyl-3-cephem-4-carboxylic acid
To 0.4 ml of a hydrogen bromide solution (33%) in acetic acid 0.5 g of 7-amino-3-vinyl-3-cephem-4-carboxylic acid was added at 0.degree. C. After pulverizing the solid material gradually 5 ml of acetone was added with vigorous stirring. Then the reaction mixture was stirred for another 30 minutes at 0.degree. C., and the crystals formed were filtered off, washed with acetone and dried giving 0.62 g (88%) of the title compound.
IR (KBr-disc, values in cm.sup.-1): 2940, 2810, 2740, 1795, 1715, 1655, 1610, 1580, 1515, 1395, 1340, 1190, 1170, 1120, 1055, 1020, 990, 935, 800, 775, 725, 690, 425. NMR (360 MHz; CF.sub.3 COOD; tetramethylsilane as a reference; .delta.-values in ppm): 2.54 (s, 3H); 2.66 (s, 3H); 3.54 (s, 2H); 5.29 (d, 1H; J=4.3 Hz); 5.51 (d, 1H; J=10.8 Hz); 5.63 (d, 1H; J=16.8 Hz); 5.78 (d, 1H; J=4.3 Hz); 7.32 (dd, 1H; J=10.8 and 16.8 Hz).
EXAMPLE XXI
Preparation of 4-carboxy-7-cyclohexylideneammonio-3-vinyl-3-cephem bromide from 7-amino-3-vinyl-3-cephem-4-carboxylic acid
To 0.12 ml of a concentrated hydrogen bromide solution (47%) in water subsequently 140 mg (purity 95%; 0.59 mmoles) of 7-amino-3-vinyl-3-cephem-4-carboxylic acid, 0.15 ml of cyclohexanone (1.4 mmole) and 0.1 ml of acetonitrile was added at 0.degree. C. After storing the reaction mixture in the refrigerator overnight, the precipitate formed was filtered off, washed with cyclohexanone and ether and dried, yielding 159 mg (70%) of the title compound.
IR (KBr-disc, values in cm.sup.-1); 3440, 2870, 1798, 1710, 1655, 1575, 1517, 1394, 1350, 1212, 978, 943, 702. NMR (360 MHz; CF.sub.3 COOD; tetramethylsilane as a reference; .delta.-values in ppm): 1.63 (m, 2H); 1.91 (m, 4H); 2.79 (m, 4H); 3.49 (d, 1H; J=16.2 Hz); 3.57 (d, 1H; 16.2 Hz); 5.32 (d, 1H; J=4.5 Hz); 5.49 (d, 1H; J=10.8 Hz); 5.64 (d, 1H; J=15.1 Hz); 5.82 (d, 1H; J=4.5 Hz); 7.30 (dd, 1H; J=10.8 and 15.1 Hz).
EXAMPLE XXII
Preparation of 4-carboxy-7-isopropylideneammonio-3-methyl-1-oxo-3-cephem bromide from 7-amino-3-methyl-3-cephem-1-oxo-4-carboxylic acid
With stirring 0.4 ml of a hydrogen bromide solution (33%) in acetic acid was added to 1 g (2.1 mmoles) of 7-amino-3-methyl-1-oxo-3-cephem-4-carboxylic acid at 0.degree. C. After adding gradually 5 ml of acetone a crystalline precipitate was obtained, which was filtered off, washed with acetone and dried giving 0.60 g (79%) of the title product.
IR (KBr-disc, values in cm.sup.-1): 2960, 2740, 1790, 1715, 1550, 1505, 1400, 1360, 1200, 1190, 1150, 1115, 1040, 1010, 980, 910, 845, 810, 790, 720, 690. NMR (360 MHz; CF.sub.3 COOD; tetramethylsilane as a reference; .delta.-values in ppm): 2.03 (s, 3H); 2.48 (s, 3H); 2.52 (s, 3H); 3.68, 3.82 (AB-q, 2H; J=18 Hz); 5.42 (d, 1H; J=4.5 Hz); 6.03 (d, 1H; J=4.5 Hz).
EXAMPLE XXIII
Preparation of 3-carboxy-6-isopropylideneammonio-2,2-dimethyl-1,1-dioxo-penam chloride from 6-amino-2,2-dimethyl-1,1-dioxo-penam-3-carboxylic acid
In a centrifuge tube 1.0 ml of a hydrogen chloride solution (7%) in acetic acid was added to 0.5 g (2 mmoles) of 6-amino-2,2-dimethyl-1,1-dioxo-penam-3-carboxylic acid at 0.degree. C. with stirring. After adding gradually 3 ml of acetone a crystalline precipitate was obtained, which was filtered off, washed with acetone and dried giving 0.55 g (85%) of the title product.
IR (KBr-disc, values in cm.sup.-1); 3000, 2900, 2620, 1815, 1760, 1665, 1525, 1465, 1430, 1400, 1325, 1210, 1190, 1150, 1115, 1085, 965, 855, 745, 645, 555. NMR (360 MHz; CF.sub.3 COOD; tetramethylsilane as a reference; .delta.-values in ppm): 1.68 (s, 3H); 1.81 (s, 3H); 2.88 (s, 3H); 2.90 (s, 3H); 4.90 (s, 1H); 5.54 (d, 1H; J=4.2 Hz); 6.40 (d, 1H; J=4.2 Hz).
EXAMPLE XXIV
Preparation of 4-carboxy-7-isopropylideneammonio-3-methyl-2-cephem bromide from 7-amino-3-methyl-2-cephem-4-carboxylic acid
In a centrifuge tube 0.4 ml of a hydrogen bromide solution (33%) in acetic acid was added to 0.5 g (2.3 mmoles) of 7-amino-3-methyl-2-cephem-4-carboxylic acid at 0.degree. C. with stirring. Thereafter 2 ml of acetone was added gradually. After precipitation started another 5 ml of acetone was added. After standing overnight at 2.degree. C. the crystals formed were filtered off, washed with acetone and dried, giving 0.560 g (73%) of the title product.
IR (KBr-disc, values in cm.sup.-1): 2800, 2740, 1775, 1730, 1665, 1370, 1240, 1180, 1150, 1025, 950, 880, 840, 820, 795, 705, 645, 600. NMR (360 MHz; CF.sub.3 COOD; tetramethylsilane as a reference; .delta.-values in ppm): 1.69 (d, 3H; J=1 Hz); 2.40 (s, 3H); 2.49 (s, 3H); 4.75 (s, 1H); 5.43 (d, 1H; J=4.3 Hz); 5.66 (m, 1H); 5.70 (d, 1H; J=4.3 Hz).
EXAMPLE XXV
Preparation of 4-carboxy-7-isopropylideneammonio-3-methylene-cepham bromide from 7-amino-3-methylenecepham-4-carboxylic acid
To 0.8 ml of a hydrogen bromide solution (33%) in acetic acid 1.0 g (purity 96%; 4.49 mmoles) of 7-amino-3-methylenecephem-4-carboxylic acid was added at 0.degree. C. With stirring a yellow precipitate was obtained. After adding gradually 10 ml of acetone the syrupy material changed into a crystalline product. Stirring for another 30 minutes at 0.degree. C., filtration of the precipitate, washing with acetone and drying yielded 1.30 g (86%) of the title product.
IR (KBr-disc, values in cm.sup.-1): 2840, 2750, 1775, 1730, 1655, 1525, 1420, 1370, 1230, 1180, 1140, 1075, 935, 800, 790, 730, 590. NMR (360 MHz; CF.sub.3 COOD; tetramethylsilane as a reference; .delta.-values in ppm): 2.47 (s, 3H); 2.59 (s, 3H); 3.24, 3.53 (AB-q, 2H; J=14.4 Hz); 5.20 (s, 1H); 5.23 (s, 1H); 5.26 (d, 1H); 5.61 (d, 1H; J=4.3 Hz); 5.71 (d, 1H; J=4.3 Hz).
EXAMPLE XXVI
Preparation of N-cyclohexylidene-.beta.-alaninium bromide from .beta.-alanine
Cyclohexanone was added to a solution of .beta.-alanine in a hydrogen bromide solution (33%) in acetic acid. After standing for an hour in the refrigerator the formed crystals were filtered off, washed with cyclohexanone and ether, and dried.
IR (KBr-disc, values in cm.sup.-1): 3440, 2930, 2555, 1740, 1680, 1527, 1458, 1371, 1323, 1210, 980, 947, 878, 859, 828, 797, 668, 629. NMR (360 MHz; CF.sub.3 COOD; tetramethylsilane as a reference; .delta.-values in ppm): 1.67 (m, 2H); 1.87 (m, 4H); 2.72 (m, 4H); 2.98 (t, 2H); 4.03 (m, 2H).
EXAMPLE XXVII
Preparation of 3-acetoxymethyl-4-carboxy-7-isopropylideneammonio-3-cephem chloride from the sodium salt of cephalosporin C
To a suspension of 12.4 g (purity 95%; 24.8 mmoles) of the sodium salt of cephalosporin C dihydrate in 115 ml methylenechloride and 19.4 ml (153 mmoles) of N,N-dimethylaniline, 18 ml (141.5 mmoles) of trimethylsilyl chloride was added gradually. After stirring the reaction mixture at 35.degree. C. during 90 minutes the temperature was lowered to -50.degree. C. 7.5 g (36 mmoles) of phosphorus pentachloride were added and stirring was continued at -40.degree. C. for 2 hours. After the temperature was lowered to -50.degree. C., 38 ml of methanol were added and stirring was continued at -30.degree. C. for 90 minutes. To the reaction mixture 200 ml of acetone were added during 10 minutes. After stirring for another hour at 2.degree. C. the crystalline precipitate formed was filtered off, washed with acetone and dried, yielding 9.86 g of the title product. Purity 70% Yield 80%.
EXAMPLE XXVIII
Preparation of 3-acetoxymethyl-4-carboxy-7-cyclohexylideneammonio-3-cephem chloride from the sodium salt of cephalosporin C
According to the same method as described in the example XXVII the title product was prepared by adding 90 ml of cyclohexanone instead of 200 ml of acetone, concentrating the reaction mixture and adding 25 ml of a HCl solution in water (37%).
EXAMPLE XXIX
Preparation of 3-acetoxymethyl-4-carboxy-7-cyclohexylideneammonio-3-cephem bromide from cephalosporin C
24.7 g of cephalosporin C (purity 96%; 50 mmoles) were silylated with a mixture of 35.9 ml (283 mmoles) of trimethylsilylchloride and 38.7 ml (305 mmoles) of N,N-dimethylaniline in 225 ml of methylene chloride at 35.degree. C. during 90 minutes with stirring. After cooling down to -50.degree. C., 14.7 g (70.5 mmoles) of phosphorus pentachloride were added and stirring was continued at -40.degree. C. for 100 minutes. After the temperature was lowered to -50.degree. C., 75 ml of methanol were added and stirring was continued at -30.degree. C. for 90 minutes.
To 50 ml of this reaction mixture 25 ml of chilled (0.degree. C.) cyclohexanone were added, methanol and methylene chloride were evaporated and 5 ml of a HBr solution in water (47%) were added. After keeping the temperature at 0.degree. C. for about 190 minutes and at -20.degree. C. for 30 minutes the crystalline precipitate was isolated by centrifugation, washed with cyclohexanone and acetone and dried, giving 2.68 g of the title product. Purity 84%. Yield 77%.
EXAMPLE XXX
Preparation of 3-methyl-4-carboxy-7-isopropylideneammonio-3-cephem chloride from 7-phenylacetamido-3-methyl-3-cephem-4-carboxylic acid
12 g of 7-phenylacetamido-3-methyl-3-cephem-carboxylic acid (34.6 mmoles) were silylated with a mixture of 15.1 ml (119.1 mmoles) of N,N-dimethylaniline and 8.3 ml (65.3 mmoles) of trimethylsilyl chloride in 100 ml of methylene chloride at 10.degree. C. during 5 minutes with stirring. After cooling down to -65.degree. C. 8.3 g (39.9 mmoles) of phosphorus pentachloride were added and stirring was continued at -30.degree. C for 100 minutes. After the temperature was lowered to -65.degree. C., a mixture of 55 ml of isobutyl alcohol and 200 ml of acetone was added and stirring was continued at -30.degree. C. for 30 minutes. Then the temperature raised to 0.degree. C. stirring was continued for 4 hours and the precipitate was filtered off, washed and dried, giving 8.9 g (85%) of the title product. A sample (2.5 g) was purified by dissolving this product in cold formic acid, adding some isobutyl alcohol and phosphorus pentachloride, filtering off and drying the precipitate, giving 2.1 g of the pure product.
EXAMPLE XXXI
Preparation of 7-amino-3-[[(1-methyl-1H-tetrazol-5-yl)thio]methyl]-3-cephem-4-carboxylic acid from 3-acetoxymethyl-4-carboxy-7-cyclohexylideneammonio-3-cephem bromide
To a mixture of 0.437 g (1.01 mmoles) of 3-acetoxymethyl-4-carboxy-7-cyclohexylideneammonio-3-cephem bromide, 0.283 g (2.43 mmoles) of 2-mercapto-1-methyl-1H-tetrazole and 5 ml of acetonitrile, 0.62 ml of trifluoromethanesulfonic acid in 5 ml of acetonitrile was added at room temperature. After stirring for 40 minutes 10 ml of icewater and 10 ml of acetone were added. Then the pH was adjusted to 3.7 with ammonia (ice-bath) and the reaction mixture was kept overnight in the refrigerator. The precipitate formed was filtered off, washed with water and acetone and dried. Isolated was 0.248 g of 7-amino-3-[[(1-m-ethyl-1H-tetrazol-5-yl)thio]methyl]-3-cephem-4-carboxylic acid having a purity of 91%. Yield 88%.
IR-spectrum (KBr-disc; values in cm.sup.-1): 3440, 2620, 1804, 1617, 1540, 1512, 1413, 1389, 1350, 1293, 1229, 1172, 1119, 1062, 1009, 803, 790, 700, 690 and 430. NMR-spectrum (60 MHz; CD.sub.2 O.sub.2 ; sodium 3-(trimethylsilyl)-1-propane sulfonate as a reference; .delta.-values in ppm): 3.40 and 3.84 (AB-q, 2H; J=12 Hz); 4.00 (s, 3H); 3.98 and 4.35 (AB-q, 2H; J=9 Hz); 5.02 (d, 1H; J=4.5 Hz); 5.40 (d, 1H; J=4.5 Hz).
EXAMPLE XXXII
Preparation of 7-ammonio-4-carboxy-3-[(1-pyridinio)methyl]-3-cephem diiodine from 3-acetoxymethyl-4-carboxy-7-isopropylideneammonio-3-cephem chloride
To a suspension of 1.4 g (purity 90%; 3.62 mmoles) of 3-acetoxymethyl-4-carboxy-7-isopropylideneammonio-3-cephem chloride in 20 ml of methylene chloride 3.0 ml of N,O-bis(trimethylsilyl)trifluoroacetamide were added at room temperature. The silylation was accomplished by refluxing for 120 minutes. After the solution was cooled in an ice-bath, 1.14 ml (8 mmoles) of trimethylsilyl iodide was added, the temperature was raised to 22.degree. C. and stirring was continued for 30 minutes. The reaction mixture was cooled again (2.degree. C.), 1.93 ml (24 mmoles) of pyridine was added and the solution was stirred at 2.degree. C. for 20 minutes. After addition of 1.6 ml of methanol and 0.2 ml of water during 20 minutes and stirring for another 10 minutes, the crystals formed were filtered off, washed with methylene chloride and dried, giving 2.11 g of the title product with a purity of 75%. Yield 80%.
IR-Spectrum (KBr-disc; values in cm.sup.-1): 3400, 1785, 1735, 1530, 1480, 1400, 1350, 1155, 745 and 675. NMR-Spectrum (60 MHz; CD.sub.2 O.sub.2 ; sodium 3-(trimethylsilyl)-1-propanesulfonate as a reference; .delta.-values in ppm): 3.21, 3.52, 3.66 and 3.96 (AB-q, 2H; J=18.5 Hz); 5.20 and 5.29 (d, J=5.2 Hz); 5.34 and 5.42 (d, 1H; J=5.2 Hz); 5.29, 5.54, 5.75 and 5.95 (AB-q, 2H; J=14.7 Hz); 7.97 to 9.14 (m, 5H).
Particularly important is the application of the inventive process to the formation of 3-substituted methyl-3-cephem-4-carboxylic acid derivative of formula IV ##STR9## wherein P is --COOH; or --COO when Q is --CH.sub.2 R.sub.8, or Q is CH.sub.2 X
X is halogen or a mixture thereof
R.sub.8 is a ##STR10## group, R.sub.6 is alkyl, with up to 8 carbon atoms,
R.sub.7 is alkyl, with up to 8 carbon atoms,
whereby R.sub.4 and R.sub.5 are the same or different or R.sub.4, R.sub.5 together with the carbon atom to which they are attached form cycloalkylidene with up to 8 carbon atoms;
starting from 3-methyl-3-cephem-4-carboxylic acid 1 .beta.-oxide derivatives of formula V, ##STR11## wherein B is ##STR12## .HX, --NH.sub.2 or --NH.sub.2.HX, T is --CH.sub.3 when B is ##STR13## or T is --CH.sub.2 X where X is halogen or a mixture thereof when B is ##STR14## .HX or X is bromo or chloro or a mixture thereof when B is --NH.sub.2 or --NH.sub.2.HX,
R.sub.6 and R.sub.7 are as defined above,
R.sub.9 is an optionally substituted methyl group --CH.sub.2 R.sub.10 which can be introduced by penicillin fermentation, and wherein R.sub.10 is hydrogen, aryl, alkyl, cycloalkyl, alkenyl, aryloxy, alkyloxy, arylthio, alkylthio, or R.sub.6 is an optionally substituted aryl group, by carring out subsequently the following reactions preferably in the same reaction vessel without isolation of the intermediate products:
when P, Q, R.sub.6-8 and X are as defined above, and
B is ##STR15## and T, R.sub.9 and R.sub.10 are as defined above: by carrying out reactions a-f
and adding a ketone R.sub.6 R.sub.7 CO;
a) silylation of the carboxy group, optionally carried out in situ,
b) light-induced bromination of the 3-methyl group of a compound of formula II to give a compound with the 3-bromomethyl group, using a N-bromo-amide or a N-bromo-imide as brominating agent,
c) if necessary, replacement of any bromine introduced in step b) in the methylene group adjacent to the sulfur atom in the dihydrothiazine ring by hydrogen by reaction with a trialkyl or triaryl phosphite,
d) deoxygenation of the sulfoxy group employing phosphorus pentachloride in the presence of an olefinic compound having at least one carbon-carbon double bond with no more than two hydrogen atoms attached thereto, and optionally in the presence of added or already present catalyst or --CH additive,
e) an imidechloride forming reaction splitting the 7.beta.-acylamino substituent according to known procedures by adding sequentially N,N-dimethylaniline or other suitable tertiary amine and phosphorus pentachloride,
f) a reaction of the imidechloride with an alcohol such as isobutanol or 1,3-dihydroxypropane to form the corresponding iminoether and or the 7-amino-cephem derivative,
when Q is --CH.sub.2 Br and P, X, R.sub.6 and R.sub.7 are as defined above, and
B is ##STR16## and T, R.sub.9 and R.sub.10 are as defined above: by carrying out reactions a-f as described above, and
adding a ketone R.sub.6 R.sub.7 CO in the presence of an acid other than HCl;
when Q is --CH.sub.2 Cl and P, X, R.sub.6 and R.sub.7 are as defined above, and
B is ##STR17## and T, R.sub.9 and R.sub.10 are as defined above; by carrying out reactions a-f as described above,
and adding a ketone R.sub.6 R.sub.7 CO in the presence of hydrogen chloride or in the presence of a chloride providing agent together with a nitrogen containing base;
when Q is --CH.sub.2 X, and P, X, R.sub.6 and R.sub.7 are as defined above, and
B is ##STR18## .HX, is other one than being prepared or B is --NH.sub.2.HX, and T, X, R.sub.6 and R.sub.7 are as defined above;
addition of a suitable ketone R.sub.6 R.sub.7 CO, corresponding B.
For instance, compounds of formula IV are prepared and isolated from compounds of formula V wherein
B is ##STR19## and T, R.sub.9 and R.sub.10 are as defined above; Q is --CH.sub.2 X where X is bromo or chloro, and P is as defined above, and
B is ##STR20## and T, R.sub.9 and R.sub.10 are as defined above; Q is --CH.sub.2 R.sub.1 or --CH.sub.2 .sup.+ R.sub.2 X.sup.- where
R.sub.1 is
(1,2,3-triazol-5-yl)thio,
(1-methyl-tetrazol-5-yl)thio,
(5-methyl-1,3,4-thiadiazol-2-yl)thio,
(6-hydroxy-2-methyl-5-oxo-1,2,4-triazol-3-yl) thio,
(1,3,4-thiadiazol-5-yl)thio,
R.sub.2 is (1-pyridinio),
(quinuclidinio-1-ylio)
(1-methylpyrrolidin-1-ylio)
(cyclopenta[b]pyridin-1-ylio),
and P and X are as defined above, and
B is --NH.sub.2, --NH.sub.2.HX or ##STR21## .HX where R.sub.6, R.sub.7 is isopropylidene, cyclopentylidene or cyclohexylidene and T and X are as defined above;
B is ##STR22## .HCl where R.sub.6, R.sub.7 is isopropylidene or cyclopentylidene, another one than being prepared, or B is --NH.sub.2 or --NH.sub.2.HX, and T and X are as defined above, and
B is --NH.sub.2, and T is as defined above.
The present invention also provides new halo-substituted cephlosporins of the general formula VI and salts and esters thereof ##STR23## wherein X is a halogen and R.sub.6 and R.sub.7 are defined as above
The various aspects of the present invention are depicted in scheme I, wherein m is 0 or 1 and n is 0, 1 or 2.
All the reactions involving these new intermediates are carried out in inert organic solvents at -60.degree. C. to 150.degree. C., preferably at -40.degree. C. to +100.degree. C. With lower alkyl or (lower)alkyl in a compound, an alkyl group with up to 8 carbon atoms is meant. R.sub.n -.sub.n+m is meant: R.sub.n, R.sub.n+1 . . . R.sub.n+m.
With "halogen or a mixture thereof" and "bromo or chloro or a mixture thereof", respectively, is meant that the compounds with formula IV and V may be pure compounds regarding X or a mixture of compounds with different halogen atoms and bromo or chloro atoms, respectively.
The heterocyclic radical R.sub.3 may be pyridine, pyrimidine, pyridazine, pyrrole, imidazole, pyrazole, isoxazole, isothiazole, thiazole, triazole, oxadiazole, thiadiazole, triazine, thiatriazole and tetrazole linked by a ring carbon atom to the sulfur atom, whereby optional substituents attached to a ring carbon atom of a heterocyclic ring include optionally substituted lower alkyl, cyano, chloro, di(lower)alkylamino, (lower)alkyloxy like methoxy, (lower)alkyloxycarbonyl, di(lower)alkylcarbamoyl, hydroxyl, sulfo and carboxy, while ring nitrogen atoms of the heterocyclic thio group can have attached thereto an optionally substituted lower alkyl group, and optional substituents attached to the first or the second carbon atom of a lower alkyl group attached to a carbon or a nitrogen atom of a heterocyclic ring may include di(lower) alkylamino, chloro, cyano, methoxy, (lower)alkyloxycarbonyl, N,N-dimethylcarbamoyl, hydroxy, carboxy and sulfo.
The positively charged nitrogen group R.sub.2 may be for instance a ##STR24## group wherein, R.sub.11 is alkyl, with up to 8 carbon atoms
R.sub.12 is alkyl, with up to 8 carbon atoms
R.sub.13 is alkyl, with up to 8 carbon atoms whereby R.sub.11, R.sub.12 and R.sub.13 are the same or different;
or two of them form cycloalkyl with up to 8 carbon atoms and the third one is alkyl, with up to 8 carbon atoms, for instance R.sub.11, R.sub.12 together with the nitrogen atom form a pyrrolidine ring, R.sub.13 is methyl;
or R.sub.11, R.sub.12 and R.sub.13 form with the nitrogen a heterocyclic ring as a 1-pyridinium or quinuclidinium group optionally having substituents attached to the heterocyclic ring.
It will be clear that the possibility of the introduction of a new substituent at the end of a sequence of reactions as described in this application will enlarge the flexibility of a manufacture plant and lower the costs of the products produced therein. Thus, an advantage of the present process is the introduction of the substituent in a late phase thereof so that the uniformity of the process will be longer maintained.
A further important advantage of this process is that there are no special demands relating to the form wherein the thiol compounds have to be added to the cephalosporin derivatives. Contrary to the process described in the above-mentioned EPA No. 0,137,534 or in the European Patent Specification No. 0,045,760 surprisingly it does not make difference whether the thiol compound is added as such, as thiolates (with or without crystal water) or as silyl derivative. The water optionally present does not cause any side-reaction.
Generally, yields are similar with the yields obtained according to the process described in EPA No. 0137,534. Sometimes it may be preferable to add a ketone to the reaction mixture after having carried out the iminoether forming reaction in order to obtain ammonium compounds.
The invention also relates to new intermediates, viz. 7.beta.-(cyclo) alkylideneammonio-3-halomethyl-3-cephem-4-carboxylic acid derivatives of the general formula VI (depicted above) and salts and esters thereof, wherein
X is halogen, and
R.sub.6, R.sub.7 are as defined above;
and to 7.beta.-amino/ammonio-3-bromomethyl-3-cephem-4-carboxylic acid and 7.beta.-amino/ammonio-3-chloromethyl-3-cephem-4-carboxylic acid derivatives of the general formula VII (depicted below) and salts and esters thereof ##STR25## X is bromo or chloro, and m is 0 or 1,
and to the isolation of these compounds from the reaction mixture.
A number of new cephalosporin derivatives formed in the course of the above-described process can be isolated. This concerns in the first place a mixture of 7.beta.-(cyclo)alkylideneammonio-3-bromomethyl-3-cephem-4-carboxylic acid and 7.beta.-(cyclo)alkylideneammonio-3-chloromethyl-3-cephem-4-carboxylic acid derivatives. They can be isolated as a crystalline material after adding a ketone to the reaction mixture, simply by filtration. It is also possible to carry out the reaction in such a way that either the 3-bromo or 3-chloromethyl compound are formed. The 3-bromomethyl compound can be formed adding an acid other than hydrogen chloride before or simultaneously with the ketone. The 3-chloromethyl compound, for instance can be prepared by adding a sufficient amount of hydrogen chloride. Sofar in the literature only cefalosporanic acid derivatives with an aldimine substituent at the 7-position have been described for instance by W. A. Spitzer, T. Goodson, R. J. Smithey and I. G. Wright, J.C. Soc. Chem. Comm., 1338 (1972).
According to an aspect of the invention the proportion of both halogen compounds in 7.beta.-(cyclo)-alkylideneammonio-3-halomethyl-3cephem-4-carboxylic acid derivatives can be influenced. Generally, more of the 3-bromomethyl compound seems to be formed in "acid" medium, while more of the chloromethyl compound is formed in a less "acid" medium. If, for instance, tetraethylammonium bromide is added to the reaction mixture, more of the chloromethyl compound is formed than without addition of this compound in spite of a larger amount of bromide present. Adding a chloride providing agent like a pentachloride in the presence of N,N-dimethylaniline does increase the yield of the chloromethyl compound. Generally, if an acid is added, a higher yield of the bromomethyl compound is obtained except in the case of an excess of hydrogen chloride. In that case the chloromethyl compound is formed in excess. These 7-(cyclo)alkylideneammonio-3-bromomethyl derivates are valuable intermediates for the preparation of many antibiotics, while the starting materials can be obtained in an economic way from penicillins.
Furthermore a mixture of 7.beta.-ammonio-3-bromomethyl-3-cephem-4-carboxylic acid and 7.beta.-ammonio-3-chloromethyl-3-cephem-4-carboxylic acid derivatives or the corresponding amino compounds (indicated throughout this text as 3-bromo/chloromethyl) can be isolated. For this type of compounds intermolecular substitution could be expected, but this does not occur. In Spanish patent ES 461095 (no equivalents found) both the 3-bromomethyl and the 3-chloromethyl compound have been mentioned in the examples as starting compounds in a process to prepare 7.beta.-amino-3-substituted methyl-3-cephem-4-carboxylic acid compounds in which the 7.beta.-amino group temporarily has been protected with an aldehyde. In no way in this patent the source of these unknown and usually highly reactive starting compounds has been described, so it seems justified to ignore the only mention of these compounds in this patent.
According to another aspect of the invention 7.beta.-amino-3-substituted methyl-3-cephem-4-carboxylic acid derivatives of formula I, with R.sub.1 is as defined before, can be prepared directly from these new intermediates replacing the halogen atom by introduction of the desired substituent and, if necessary, by hydrolysis of the ammoniogroup. For instance, 7.beta.-ammonio-4-carboxy-3[(1-pyridinio)-methyl]-3-cephem dichloride can be prepared in this way from 3-bromomethyl-4-carboxy-7.beta.-isopropylideneammonio-3-cephem bromide in a nearly quantitative yield. In this way very interesting starting materials are available which easily can be converted in a simple one-step synthesis into 7.beta.-amino-3-substituted methyl-3-cephem-4-carboxylic acid derivatives. An advantage of a process starting with 7.beta.-(cyclo)alkylideneammonio-3-halomethyl-3-cephem-4-carboxylic acid derivatives, compared to the one described in the European Patent Application No. 0137534, is that virtually no deacetoxycephalosporin derivatives will be found in the end-products. The new intermediates (7.beta.-(cyclo)alkylideneammonio-3-halomethyl-3-cephem-4-carboxylic acid derivatives and 7.beta.-amino/ammonio-3-bromo- or chloromethyl-3-cephem-4-carboxylic acid) can also nearly quantitatively be converted in each other by addition of a suitable ketone or by hydrolysis of the ammoniogroup.
If during the one-pot process by addition of a ketone a mixture of the 3-bromomethyl and the 3-chloromethyl compound of a 7.beta.-(cyclo)alkylideneammonio- derivative (indicated as 3-bromo/chloromethyl) has been formed, this mixture can be used to prepare the 3-substituted methyl derivatives. The same applies to the isolation of 7.beta.-amino/ammonio-3-bromo/chloromethyl-3-cephem-4-carboxylic acid derivatives from the one-pot process mixture. It is also possible to prepare the pure 3-halomethyl compound, for instance a pure 7.beta.-amino/ammonio-3-bromomethyl-3-cephem-carboxylic acid derivative from a corresponding pure 7.beta.-(cyclo)alkylideneammonio-3-bromomethyl derivative.
Both for the 7.beta.-(cyclo)alkylideneammonio- as for the 7.beta.-amino/ammonio-3-substituted methyl compound it is possible to convert the salt forming anion into another one.
The following non-limitative examples illustrate the invention. The preparation of the solution containing trimethylsilyl protected starting materials is described in the following "Preparation", which precedes the examples.
PREPARATION
Conversion of 7.beta.-phenylacetamido-3-methyl-3-cephem-4-carboxylic acid 1.beta.-oxide to a mixture containing trimethylsilyl 7.beta.-phenylacetamido-3-bromomethyl-3-cephem-4-carboxylate 1.beta.-oxide and a minor amount of trimethylsilyl 7.beta.-phenylacetamido-2-bromo-3-bromomethyl-3-cephem-4-carboxylate 1.beta.-oxide
According to the process described in European Patent Application No. 0137534, a suspension of 113.0 g (316 mmoles in view of the actual content of 97.5% by weight) of 7.beta.-phenylacetamido-3-methyl-3-cephem-4-carboxylic acid 1.beta.-oxide, of 11.0 g (110 mmoles) of succinimide, and of 0.3 g (1.64 mmoles) of saccharine in 2200 ml of dichloromethane was boiled without reflux in nitrogen atmosphere to remove traces of moisture by boiling off 200 ml of dichloromethane.
Subsequently 40 ml (188 mmoles) of hexamethyl disilazane were added. Upon stirring and passing over the surface of the reaction mixture nitrogen at a rate of 8 l per hour to remove developing ammonia, boiling was continued at reflux. After about 3 hours the solution was clear and the generated gas no longer contained ammonia according to, titration with acid.
Cooling down the solution to room temperature, 5 g (51 mmoles) of sulfaminic acid were added and thereafter upon stirring cooled to -4.degree. C. Subsequently the mixture was circulated by pumping from a cooled container through a double faced jacket enveloping a turned on fluorescence tube of 140 W with a peak at 350 nm. Operating under nitrogen atmosphere 40 g (225 mmoles) of N-bromo-succinimide were added at a temperature of -4.degree..+-.2.degree. C. After 5 minutes a second portion of 40 g of N-bromo-succinimide was introduced, whereupon irradiation was continued for about 65 minutes. The resulting solution weighed 2870 g, and contained according to HPLC-assay 0.070 mmol/g of trimethylsilyl 7.beta.-phenylacetamido-3-bromomethyl-3-cephem-4-carboxylate 1.beta.-oxide, which corresponds to a direct yield of 63.5%. Besides a relatively much smaller amount of trimethylsilyl 7.beta.-phenylacetamido-2-bromo-3-bromomethyl-3-cephem-4-carboxylate 1.beta.-oxide was present. In the subsequent examples this byproduct was reduced in situ to trimethylsilyl 7.beta.-phenylacetamido-3-bromomethyl-3-cephem-4-carboxylate 1.beta.-oxide by the action of a trisubstituted phosphite, after which the content of this intermediate was again determined by HPLC-assay.
If such solutions containing the mixture of the monobromide and the dibromide are submitted to selective monodebromination directly after their preparation, the yield of the monobromide after debromination of the dibromide may be in the order of 70%. In the examples however, stock-solutions were employed normally so that the total content of the monobromide after debromination usually was in the order of 60% with respect to the initially used amount of 7.beta.-phenylacetamido-3-methyl-3-cephem-4-carboxylic acid 1.beta.-oxide, this being the consequence of storing the stock-solution for several days at about -25.degree. C.

EXAMPLE I
Preparation of the monosodium salt of 7.beta.-amino-3-[[(1-sulfomethyl-tetrazol-5-yl)thio]methyl]-3-cephem-4-carboxylic acid from 7.beta.-phenylacetamido-3-methyl-3-cephem-4-carboxylic acid 1.beta.-oxide
a) In the usual fashion, as described in European Patent Application No. 0137534, 2920 g of a solution in dichloromethane containing 173.2 mmoles of trimethylsilyl 7.beta.-phenylacetamido-3-bromomethyl-3-cephem-4-carboxylate 1.beta.-oxide and 40 mmoles of trimethylsilyl 7.beta.-phenylacetamido-2-bromo-3-bromomethyl-3-cephem-4-carboxylate 1.beta.-oxide was prepared by catalyzed hexamethyldisilazane silylation of 113 g (316 mmoles) of 7.beta.-phenylacetamido-3-methyl-3-cephem-4-carboxylic acid 1.beta.-oxide followed by light-induced bromination with N-bromo-succinimide in situ.
Continuously applying anhydrous conditions the solution obtained was treated in situ with 31.4 ml (116 mmoles) of tributyl phosphite during 15 minutes at -18.degree..+-.3.degree. C., followed by cooling to -58.degree. C. 31.6 ml (242 mmoles) of cis-cyclooctene, 4.35 ml (34.3 mmoles) of N,N-dimethylaniline, 6.5 ml (84.3 mmoles) of N,N-dimethylformamide and 63.1 g (303 mmoles) of phosphorus pentachloride were added sequentially in situ, causing a rise in temperature to -47.degree. C. After 30 minutes stirring at -47.degree. C., 65.1 ml (513.5 mmoles) of N,N-dimethylaniline and 63.1 g (303 mmoles) of phosphorus pentachloride were introduced, followed by 70 minutes stirring at -48.degree. C. Subsequently 210 ml (226 mmoles) of isobutanol were added at -60.degree. C. followed by 2 hours stirring at about -45.degree. C., resulting in a mixture of 7.beta.-ammonio-3-bromomethyl-3-cephem-4-carboxylic acid chloride and corresponding iminoethers of the 3-bromomethyl and/or 3-chloromethyl compounds.
b) To the well stirred solution obtained as described hereinabove was added in 3 minutes a solution of 95 g (90.5%, 358 mmoles) of the disodium salt of 1-sulfomethyl-tetrazol-5-yl-thiol in 400 ml of water, whereby a temperature of -13.degree. C. was attained. The resulting mixture was stirred additionally for 22 minutes at -15.degree. C. to -8.degree. C., whereupon 65 ml of 25% sodium hydroxide in water were introduced to raise the pH from about -0.85 to about -0.15 at 0.degree. C. After standing for 25 minutes at 0.degree. C. the layers were separated and the organic phase was extracted with 120 ml of water. After removal by filtration of a small amount of precipitate, the aqueous layers combined were washed with 200 ml of dichloromethane and thereafter treated sequentially with 5 g (26 mmoles) of sodium metabisulphite, 950 ml of methanol and 208.5 ml of 25% sodium hydroxide in water to give pH 4.05. The resulting solution was left standing for about 16 hours at 3.degree. C., whereupon the precipitated crystalline product was collected by filtration, followed by washings with 75 ml of a 3:2 mixture of methanol and water, and with acetone, respectively. After drying in vacuo at 45.degree. C., 75.98 g of a monosodium salt of 7.beta.-amino-3-[[(1-sulfomethyl-tetrazol-5-yl)thio]-3-cephem-4-carboxylic acid were obtained in the form of heavy small cream-coloured crystalls. According to HPLC-assay the purity of the isolated product was 82% by weight, from which it is calculated that the actual overall yield starting from 7.beta.-phenylacetamido-3-methyl-3-cephem-4-carboxylic acid 1.beta.-oxide was 46%. This product could be purified as follows:
It was mixed with 335 ml of water in a 1.5 l beaker glass, followed by dissolution by means of adding 46.7 ml of 4N sodium hydroxide to give pH 8. While stirring, 4 g of sodium metabisulphite, 30 g of activated carbon and 650 ml of methanol were added, whereupon the pH was readjusted to 8 by addition of 2.8 ml of 4N hydrochloric acid. The mixture was filtered through a Seitz filter and the filter cake was washed with a mixture of 135 ml of methanol and 80 ml of water. The filtrates combined were diluted with 325 ml of methanol. While stirring, 41.5 ml of 4N hydrochloric acid were introduced slowly to give pH 4.0. The mixture was left standing for 16 hours at 3.degree. C., whereafter the precipitated crystalline product was washed with 75 ml of 60% methanol and acetone. After drying in vacuo the yield was 64.49 g. As according to HPLC assay the purity was 87.5% by weight, the actual overall yield now amounted to about 41.5%.
IR (KBr-disc, values in cm.sup.-1): 1800, 1615, 1530, 1405, 1340, 1220, 1040, 995 and 590. PMR (D.sub.2 O+NaHCO.sub.3, .delta.-values in ppm, 60 Mc, int. ref. 2,2-dimethylsilapentane-5-sulphonate): 3.21, 3.51, 3.64 and 3.93 (AB-q, J=18 Hz, 2H); 3.95, 4.18, 4.32 and 4.54 (AB-q, J=13.5 Hz, 2H); 4.71 (d, J=4.5 Hz, 1H); 4.99 (d, J=4.5 Hz, 1H); 5.51 (s, 2).
EXAMPLE II
Preparation of 7.beta.-amino-3-[[(1,2,3-triazol-5-yl)thio]methyl]-3-cephem-4-carboxylic acid from 7.beta.-phenylacetamido-3-methyl-3-cephem-4-carboxylic acid 1.beta.-oxide.
a) According to the method described in Example Ia, 415.4 g of a dichloromethane solution containing trimethylsilyl 7.beta.-phenylacetamido-3-bromomethyl-3-cephem-4-carboxylate 1.beta.-oxide and trimethylsilyl 7.beta.-phenylacetamido-2-bromo-3-bromomethyl-3-cephem-4-carboxylate 1.beta.-oxide (prepared from 44.73 mmoles of 7.beta.-phenylacetamido-3-methyl-3-cephem-4-carboxylic acid 1.beta.-oxide) were first treated with 4.44 ml (16.4 mmoles) of tributyl phosphite during 15 minutes at -15.degree. C., resulting in a content of 29.43 mmoles of trimethylsilyl 7.beta.-phenylacetamido-3-bromomethyl-3-cephem-4-carboxylate 1.beta.-oxide according to HPLC assay. Thereafter the mixture was submitted in situ to sulphoxide reduction using 5.85 ml (44.9 mmoles) of cis-cyclooctene, 0.62 ml (8 mmoles) of N,N-dimethylformamide and 9.4 g (45.2 mmoles) of phosphorus pentachloride during 30 minutes at about -45.degree. C., subsequently treated with 9.82 ml (77.5 mmoles) of N,N-dimethylaniline and 8.4 g (40.2 mmoles) of phosphorus pentachloride during 40 minutes at about -45.degree. C., and finally subjected to treatment with 30 ml (323 mmoles) of isobutanol during 60 minutes at - 40.degree. C. to -35.degree. C.
b) To the well stirred solution of 7.beta.-ammonio-3-bromomethyl-3-cephem-4-carboxylic acid chloride obtained as described hereinabove was added at fast rate a solution of 11.0 g (46.8 mmoles) of the pentahydrate of the disodium salt of 1,2,3-triazol-5-yl-thiol in 60 ml of water, resulting in a mixture of -10.degree. C. After 60 minutes additional stirring at -10.degree. C., the aqueous phase was separated from the organic phase, which organic phase was extracted with 20 ml of water. The water-layers combined were first washed with 50 ml of dichloromethane, whereupon 0.5 g of sodium metabisulphite and 125 ml of methanol were added. By slow addition of 16.7 ml of 25% sodium hydroxide in water the pH was raised from 0.25 to 4.0 at about 10.degree. C. This resulted in an amorphous precipitate, which was collected by filtration and washed with 25 ml of 60% methanol and with acetone, respectively. After drying in vacuo at 45.degree. C. the cream-coloured 7.beta.-amino-3-[[(1,2,3-triazol-5-yl)thio]methyl]-3-cephem-4-carboxylic acid herewith obtained weighed 8.04 g. As according to HPLC assay the purity of the product was 89% by weight, the actual overall yield based on the initially used amount of 7.beta.-phenylacetamido-3-methyl-3-cephem-4-carboxylic acid 1.beta.-oxide was 51%.
IR (KBr-disc, values in cm.sup.-1): 1810, 1620, 1540, 1410, 1345, 1290, 1230, 1150, 1115, 1060, 1000, 800 and 790. PMR (DCOOD, .delta.-values in ppm, 360 Mc, int. ref. TMS): 3.84 and 3.92 (AB-q, 2H; J=18 Hz); 4.28 (s, 2H); 5.47 (d, 1H; J=4.5 Hz); 5.50 (d, 1H; J=4.5 Hz); 8.36 (s, 1H).
EXAMPLE III
Preparation of 7.beta.-amino-3-[[(1-carboxymethyl-tetrazol-5-yl)thio]methyl]-3-cephem-4-carboxylic acid from 7.beta.-phenylacetamido-3-bromomethyl-3-cephem-4-carboxylic acid 1.beta.-oxide.
a) A process was carried out described in Example Ia. Silylation, bromination and debromination in one pot applied on the starting material 7.beta.-phenylacetamido-3-methyl-3-cephem-4-carboxylic acid 1.beta.-oxide (43.2 mmoles) afforded 325 ml of a solution in dichloromethane, containing 26.6 mmoles of trimethylsilyl 7.beta.-phenylacetamido-3-bromomethyl-3-cephem-4-carboxylate 1.beta.-oxide according to HPLC-assay. Then 5.2 ml (40 mmoles) of cis-cyclooctene, 0.71 ml of N,N-dimethylaniline, 1.35 ml of N,N-dimethylformamide, and 9.9 g (47.5 mmoles) of phosphorus pentachloride were added at -45.degree. C., followed by 30 minutes additional stirring at -45.degree. C. 10.6 ml (83.6 mmoles) of N,N-dimethylaniline and 9.9 g (47.5 mmoles) of phosphorus pentachloride were further introduced, whereafter the mixture was stirred again for 30 minutes at the same temperature. Addition of 31.5 ml of isobutanol and 60 minutes additional stirring were carried out at -35.degree. C.
b) To the solution of crude 7.beta.-ammonio-3-bromomethyl-3-cephem-4-carboxylic acid chloride thus prepared were added 10.6 g (52 mmoles) of the disodium salt of 1-carboxymethyl-tetrazol-5-yl-thiol. The temperature of the well stirred mixture was raised to 0.degree. C., followed by 60 minutes stirring at 0.degree. C. After introduction of 50 ml of cold water and 15 minutes stirring at 0.degree. C., the organic phase was separated from the aqueous phase. The organic phase was two times extracted with 40 ml of cold water and was thereafter discarded. The water-layers combined were washed with dichloromethane, and thereafter diluted with 300 ml of cold methanol. After slow addition of 4N sodium hydroxide to give pH 3.6 the preparation was left standing overnight at 0.degree. C. The precipitate formed was collected by filtration, washed with a cold 1:1 mixture of methanol and water and with acetone, respectively, and thereafter dried in vacuo over phosphorus pentaoxide. Isolated were 7.5 g of a crude product which apart from impurities contained the desired compound for about 75% as the amino dicarboxylic acid and 25% as a monosodium salt thereof, which was revealed by titration with sodium hydroxide on a small sample. According to PMR-assay with the help of a weighed amount of an internal reference the crude product contained 16.53 mmoles of 7.beta.-amino-3-[[(1-carboxymethyl-tetrazol-5-yl)thio]methyl]-3-cephem-4-carboxylic acid/carboxylate (a purity of 87% by weight) corresponding with an overall actual yield of 38.6%, as calculated from the amount of 7.beta.-phenylacetamido-3-methyl-3 -cephem-4-carboxylic acid 1.beta.-oxide.
c) The title compound devoid of remaining monosodium salt was obtained in about 34% overall yield and with a purity of 95.6% by weight according to PMR-assay by dissolution of the crude product in a minimal volume of water with the help of 4N hydrochloric acid to pH 1.4, dilution with three parts of methanol, filtration and addition of 4N sodium hydroxide to pH 2.6. The precipitate was collected by filtration, washed with a small volume of a cold 1:1 mixture of methanol and water and with acetone, and dried in vacuo to constant weight.
IR (KBr-disc, values in cm.sup.-1): 1820, 1635, 1550, 1370, 1130, 1080. PMR (DCO.sub.2 D, .delta.-values in ppm, 250 Mc, int. ref. TMS): 3.83, 3.90, 3.90, 3.97 (AB-q, J=18 Hz, 2H); 4.50, 4.55, 4.64, 4.69 (AB-q, J=14 Hz, 2H); 5.43, 5.45, 5.47, 5.49 (AB-q, J about 5 Hz, 2H); 5.50 (s, 2H).
EXAMPLE IV
Preparation of 7.beta.-amino-3-[[(1-(2-dimethylamino)ethyltetrazol-5-yl)thio]methyl]-3-cephem-4-carboxylic acid from a solution of crude 7.beta.-phenylacetamido-3-bromomethyl-3-cephem-4-carboxylic acid 1.beta.-oxide
a) A process was carried out as described in Example Ia. Silylation, bromination and debromination in one pot applied on the starting material 7.beta.-phenylacetamido-3-methyl-3-cephem-4-carboxylic acid 1.beta.-oxide (33.1 mmoles) afforded 260 ml of a solution in dichloromethane, containing 19.9 mmoles of trimethylsilyl 7.beta.-phenylacetamido-3-bromomethyl-3-cephem-4-carboxylate 1.beta.-oxide according to HPLC-assay. At -55.degree. C. were added 3.80 ml (29.2 mmoles) of cis-cyclooctene and 7.66 g (36.8 mmoles) of phosphorus pentachloride, followed by 30 minutes stirring at -45.degree. C. Then 7.62 ml (60.1 mmoles) of N,N-dimethylaniline and 7.66 g (36.8 mmoles) of phosphorus pentachloride were introduced at -45.degree. C. After 30 minutes stirring at the same temperature 27 ml of isobutanol were added at -35.degree. C., whereupon the mixture was stirred for 60 minutes at -35.degree. C.
b) To the well stirred solution obtained as described hereinabove were added 6.37 g (36.8 mmoles) of pulverized 1-(2-dimethylamino)ethyl-tetrazol-5-yl-thiol followed by stirring for 60 minutes at -10.degree. C. and for 30 minutes at 0.degree. C. Stirring was continued during 10 minutes after dilution with 100 ml of cold water, whereupon the aqueous phase was separated from the organic phase which was extracted twice with 50 ml of cold water. The aqueous layers combined were washed with dichloromethane, and thereafter stirred with activated carbon which was removed by filtration. Triethylamine was added to the filtrate to give pH 3.2, whereupon the solution was concentrated azeotropically in vacuo with n-butanol to give a volume of about 100 ml. Ethanol was added slowly to achieve complete precipitation. While stirring the preparation was kept at 0.degree. C. during 45 minutes, whereupon the precipitate was collected by filtration, followed by washings with 70% ethanol, 96% ethanol and acetone, respectively. After drying in vacuo the yield of 7.beta.-amino-3-[[(1-(2-dimethylamino)ethyl-tetrazol-5-yl)thio]methyl]-3-cephem-4-carboxylic acid chloride was 5.4 g. As indicated by quantitative PMR-assay on a solution of weighed amounts of the product and of a reference compound, the purity was 88% by weight. Calculating from the initially employed amount of 7.beta.-phenylacetamido-3-methyl-3-cephem-4-carboxylic acid 1.beta.-oxide the actual overall yield was 35.2%.
PMR (D.sub.2 O, .delta.-values in ppm, 60 Mc, int. ref. 2,2-dimethylsilapentane-5-sulphonate): 3.07 (s, 6H); 3.77, 3.86, 3.96 (t, J=6 Hz, 2H); 3.83 (s, 2H); 4.32 (s, 2H); 4.92, 5.02, 5.12, 5.21 (t, J=6 Hz, 2H); 5.12, 5.21 (d, J=5.2 Hz, 1H); 5.27, 5.35 (d, J=5.2 Hz, 1H). IR (KBr-disc, values in cm.sup.-1): 3360, 1802, 1618, 1530, 1410, 1345, 1285.
EXAMPLE V
Preparation of 7.beta.-amino-3-[[(1-methyl-tetrazole-5-yl)thio]methyl]-3-cephem-4-carboxylic acid from 7.beta.-phenylacetamido-3-methyl-3-cephem-4-carboxylate 1.beta.-oxide
In the usual fashion, as described in the European Patent Application No. 0137534, a suspension of 100 g (purity 97.5%; 280 mmoles) of 7.beta.-phenylacetamido-3-methyl-3-cephem-4-carboxylic acid 1.beta.-oxide in 2000 ml of dichloromethane was silylated with hexamethyl disilazane and subsequently brominated with N-bromo-succinimide giving 2855 g of a reaction mixture containing a mixture of trimethylsilyl 7.beta.-phenylacetamido-3-bromomethyl-3-cephem-4-carboxylate 1.beta.-oxide and trimethylsilyl 7.beta.-phenylacetamido-2-bromo-3-bromomethyl-3-cephem-4-carboxylate 1.beta.-oxide. Continuous applying anhydrous conditions 248.8 g of this stock-solution were cooled down to -60.degree. C. and treated in situ with 2.5 ml (9.2 mmoles) of tributyl phosphite for 45 minutes. According to HPLC analysis, the reaction mixture contained 14.89 mmoles of trimethylsilyl 7.beta.-phenylacetamido-3-bromomethyl-3-cephem-4-carboxylate, which corresponds to a yield of 61%. 2.7 ml (20.7 mmoles) of cyclooctene, 0.3 ml (2.7 mmoles) of N,N-dimethyl aniline and 0.5 ml (6.8 mmoles) of N,N-dimethylformamide were then added in situ followed by 5 g (24.1 mmoles) of phosphorus pentachloride after 5 minutes. After stirring for another 40 minutes 5.1 ml (40.5 mmoles) of N,N-dimethylaniline and 5 g (24.1 mmoles) of phosphorus pentachloride were added. After stirring for 200 minutes at -50.degree. C. a solution of 4.5 g (30 mmoles) of sodium iodide in 100 ml of methanol was added. The temperature was allowed to rise to -10.degree. C. and stirring was continued for 105 minutes. After adding 4.36 g (37.5 mmoles) of 5-mercapto-1-methyl-tetrazole, stirring for 50 minutes, keeping the reaction mixture overnight and stirring for another 180 minutes, the reaction mixture was added dropwise to a chilled mixture of 130 ml of water, 20 ml of butyl acetate and 8.3 g of sodium bisulphite. Meanwhile the pH was kept at 8 with a 4N potassium hydroxide solution. After separating the layers and extracting the organic layer with 3.5 ml of water, the combined water layers were washed with 25 ml of butyl acetate and brought to pH 3.5 with a 4N hydrochloric acid solution. After maintaining the mixture at 2.degree. C. for 16 hours, the precipitate was filtered off, washed subsequently with a 3:7 mixture of propanol-2 and water, a 1:1 mixture of acetone and water and acetone, respectively, and dried in vacuo, thus yielding 3.27 g of the title compound. According to HPLC essay the purity was 83% by weight. The mother liquor contained another 6% of the title compound. The isolated overall yield starting from 7.beta.-phenylacetamido-3-methyl-3-cephem-4-carboxylic acid 1.beta.-oxide amounted to 33%.
EXAMPLE VI
Preparation of 7.beta.-amino-3-[[(5-methyl-1,3,4-thiadiazol-2-yl)thio]methyl]-3-cephem-4-carboxylic acid from 7.beta.-phenylacetamido-3-methyl-3-cephem-4-carboxylate 1.beta.-oxide
341.6 g of the stock solution obtained as described in example V, containing a mixture of trimethylsilyl 7.beta.-phenylacetamido-3-bromomethyl-3-cephem-4-carboxylate 1.beta.-oxide and trimethylsilyl 7.beta.-phenylacetamido-2-bromo-3-bromomethyl-3-cephem-4-carboxylate 1.beta.-oxide, were treated with 3.4 ml (12.4 mmoles) of tributyl phosphite for 45 minutes at -60.degree. C. Next, the reduction of the sulphoxide was carried out with 3.7 ml (28.1 mmoles) of cyclooctene, 0.5 ml (3.7 mmoles) of N,N-dimethylaniline, 0.7 ml (9.2 mmoles) of N,N-dimethylformamide and 6.8 g (32.6 mmoles) of phosphorus pentachloride. After stirring for 40 minutes at -60.degree. C. 7 ml (54.9 mmoles) of N,N-dimethylaniline and 6.8 g (32.6 mmoles) of phosphorus pentachloride were added and stirring was continued for 200 minutes at -50.degree. C. After adding a solution of 6.1 g (40.6 mmoles) of sodium iodide in 100 ml of methanol, the temperature was allowed to rise to -10.degree. C. and stirring was continued for 105 minutes. 6.7 g (50.8 mmoles) of 2-mercapto-5-methyl-1,3,4-thiadiazole were then added, after which the reaction mixture was stirred for one hour at -10.degree. C. and kept overnight at 0.degree. C. After adding 50 ml of water and stirring for 15 minutes at 0.degree. C., the layers were separated and the organic layer extracted with another 50 ml of water. To the combined water layers 50 ml of isobutanol were added and the pH was adjusted to 7.9 with ammonia. After separating the layers and extracting the isobutanol layer with water, the pH of the combined water layers was adjusted to 3.5 with a 4N sulfuric acid solution. After keeping the reaction mixture for 20 hours in the refrigerator the precipitate was filtered off, washed with water and acetone and dried in vacuo, yielding 5.85 g of the title product. The purity according to HPLC was 86.6%. The overall yield amounted to 44%.
EXAMPLE VII
Preparation of 7.beta. -amino-[[(1,2,3-triazol-5-yl)thio]methyl]-3-cephem-4-carboxylic acid from 7.beta.-phenylacetamido-3-methyl-3-cephem-4-carboxylic acid 1.beta.-oxide in the presence of acetone
a) According to the method described in Example Ia, 526.5 g of a dichloromethane solution containing trimethylsilyl 7.beta.-phenylacetamido-3-bromomethyl-3-cephem-4-carboxylate 1.beta.-oxide and trimethylsilyl 7.beta.-phenylacetamido-2-bromo-3-bromomethyl-3-cephem-4-carboxylate 1.beta.-oxide were cooled down to -52.degree. C. and treated with 5.25 ml (19.4 mmoles) of tributyl phosphite during 48 minutes at -50.degree..+-.2.degree. C.
Thereafter the mixture was submitted in situ to sulphoxide reduction using 5.7 ml (43.7 mmoles) of cis-cyclooctene, 0.75 ml (5.9 mmoles) of N,N-dimethylaniline, 1.1 ml (14.3 mmoles) of N,N-dimethylformamide and 10.6 g (50.9 mmoles) of phosphorus pentachloride during 30 minutes at about -45.degree. C., subsequently treated with 10.9 ml (86.0 mmoles) of N,N-dimethylaniline and 10.6 g (50.9 mmoles) of phosphorus pentachloride during 4 hours and 5 minutes at about -50.degree. C., and finally subjected to treatment with 40 ml (431 mmoles) of isobutanol and 225 ml (3.06 mol) of acetone. The obtained solution was stirred during one hour at -40.degree. C. whereafter it was preserved during the night in the refrigerator at -28.degree. C. The reaction mixture was stirred for another two hours at -25.degree. C. Stirring a sample was taken which contained 3-bromo/chloromethyl-4-carboxy-7.beta.-isopropylideneammonio- 3-cephem chloride.
To the well stirred solution obtained as described hereinabove was added at fast rate a solution of 13.0 g (55.3 mmoles) of the dihydrate of the disodium salt of 1,2,3-triazol-5-yl-thiol in 70 ml of water, resulting in a mixture of -5.degree. C. Because a separation of the organic and water layer could not be obtained the solution was evaporated to a volume of 230 ml at the rotavapor at low temperature (0.degree. C.). To the concentrate obtained after about half an hour 100 ml of trichloromethane and 25 of H.sub.2 O were added whereafter the layers were separated. The water-layers combined were first washed with 10 ml of trichloromethane, whereupon 0.6 g of sodium metabisulphite and 150 ml of methanol were added. By slow addition of 25% sodium hydroxide in water under cooling the pH was raised from 0.3 to 1.7 at about 15.degree. C. Then the pH was raised within 1.5 hour to pH 2.4 at room temperature where crystallization occurs. Finally the pH was brought at 3.93 within 10 minutes. There was 38 of 25% (7.95N) sodium hydroxide used. After a night standing in the refrigerator the crystal was filtered and washed with 25 ml of 60% methanol and with acetone, respectively. After drying in vacuo at 40.degree. C. the cream-coloured 7.beta.-amino-3-[[(1,2,3-triazol-5-yl)thio]methyl]-3-cephem-4-carboxylic acid herewith obtained weighed 9.0625 g. As according to HPLC assay the purity of the product was 85.5% by weight, the actual overall yield based on the initially used amount of 7.beta.-phenylacetamido-3-methyl-3-cephem-4-carboxylic acid 1.beta.-oxide was 48%. The structure was confirmed by spectroscopic means.
EXAMPLE VIII
Preparation of 3-bromomethyl-4-carboxy-7.beta.-isopropylideneammonio-3-cephem bromide from a solution of 7.beta.-phenylacetamido-3-methyl-3-cephem-4-carboxylic acid 1.beta.-oxide
a) According to the method described in Example Ia, 390.65 g of a dichloromethane solution containing trimethylsilyl 7.beta.-phenylacetamido-3-bromomethyl-3-cephem-4-carboxylate 1.beta.-oxide and trimethylsilyl 7.beta.-phenylacetamido-2-bromo-3-bromomethyl-3-cephem-4-carboxylate 1.beta.-oxide were cooled down to -65.degree. C. and treated with 3.85 ml (14.2 mmoles) of tributyl phosphite during 70 minutes at -60.degree..+-.2.degree. C.
Thereafter the mixture was submitted in situ to sulphoxide reduction using 4.2 ml (32.2 mmoles) of ciscyclooctene, 0.5 ml (3.9 mmoles) of N,N-dimethylaniline, 0.8 ml (10.4 mmoles) of N,N-dimethylformamide and 7.65 g (36.7 mmoles) of phosphorus pentachloride during 65 minutes at about -66.degree. C., subsequently treated with 4.8 ml (37.9 mmoles) of N,N-dimethylaniline and 7.65 g (36.7 mmoles) of phosphorus pentachloride during 2 hours and 15 minutes at about -66.degree. C., and subjected to treatment with 28 ml (30.3 mmoles) of isobutanol. After 1 hour and 30 minutes stirring at about -65.degree. C. the reaction mixture was finally subjected to treatment with 345 ml (4.7 mol) of acetone and 19 ml (166 mmoles) of a solution of HBr, 47%.
The crystal was filtered and washed with methylene chloride and with acetone. After drying in vacuo at 40.degree. C. the white-pink coloured 3-bromomethyl-4-carboxy-7.beta.-isopropylideneammonio-3-cephem bromide herewith obtained weighed 8.1387 g.
IR-spectrum (KBr-disc; values in cm.sup.-1): 3420, 1790, 1692, 1650, 1610, 1512, 1397, 1347, 1215, 1180, 1091, 1059, 992, 820, 720, 697, 620. NMR-spectrum (360 MHz; CF.sub.3 CO.sub.2 D; .delta.-values in ppm; int. ref. maleic acid; .delta.=6.35); 2.54 (s, 3H); 2.63 (s, 3H); 3.53, 3.58 (AB-q or d, 2H; J=17.3 Hz); 4.29, 4.33 (AB-q or d, 2H; J=10.7 Hz); 5.33 (d, 1H; J=4.5 Hz); 5.83 (d, 1H, J=4.5 Hz).
EXAMPLE IX
Preparation and isolation of 7.beta.-ammonio-3-bromomethyl-4-carboxy-3-cephem chloride from 7.beta.-phenylacetamido-3-methyl-3-cephem-4-carboxylic acid 1.beta.-oxide
According to the process described in Example Ia, 28.91 mmoles of 7.beta.-phenylacetamido-3-methyl-3-cephem-4-carboxylic acid 1.beta.-oxide in dichloromethane were converted by silylation and bromination into 267.7 g of a reaction mixture, containing trimethylsilyl 7.beta.-phenylacetamido-3-bromomethyl-3-cephem-4-carboxylate 1.beta.-oxide and a minor amount of its 2-bromo derivative. The solution was in the usual way treated with 3.2 ml of tributyl phosphite to give a solution containing 17.63 mmoles of trimethylsilyl 7.beta.-phenylacetamido-3-bromomethyl-3-cephem-4-carboxylate 1.beta.-oxide.
The solution obtained was cooled down to -45.degree. C. followed by the introduction of 3.88 ml (30 mmoles) of cis-cyclooctene, 0.42 ml (3.3 mmoles) of N,N-dimethylaniline, 0.38 ml (5 mmoles) of N,N-dimethylformamide and 6 g (28.8 mmoles) of phosphorus pentachloride, respectively, whereafter the mixture was stirred for 30 minutes at -45.degree. C.
6 ml (47.6 mmoles) of N,N-dimethylaniline and 6 g (28.8 mmoles) of phosphorus pentachloride were added at the same temperature. After additional stirring during 30 minutes 22 ml (238 mmoles) of isobutanol were added slowly, followed by 60 minutes stirring at -35.degree. C.
To the resulting reddish brown solution were added 2.6 ml (31.9 mmoles) of pyridine and 4.1 ml (31.9 mmoles) of trimethylsilyl chloride, followed by 30 minutes stirring at -10.degree. C. The preparation was stored for 2 hours at -25.degree. C. resulting in the formation of a precipitate. The precipitate was collected by filtration and washed with dichloromethane. The product obtained was dissolved in a minimal volume of methanol at 0.degree. C., followed by slow addition of 10 ml of cold 1N hydrochloric acid and 200 ml of isopropanol, respectively. The resulting solution was concentrated in vacuo to a small volume. The almost white crystalline product formed hereby was collected by filtration, sequentially washed with cold isopropanol and n-hexane. After drying in vacuo the yield was 2.64 g. By PMR-assay, using a solution in DCO.sub.2 D prepared from weighed amounts of isolated product and maleic acid, it was found that the isolated product was the hydrochloric salt of 7.beta.-amino-3-bromomethyl-3-cephem-4-carboxylic acid in about 85% purity by weight. Therefore, the actual overall yield was about 24%.
PMR (DCO.sub.2 D, .delta.-values in ppm, 300 Mc, int. ref. TMS): 3.79, 3.85, 3.91 (AB-q, J=18 Hz, 2H); 4.68, 4.72, 4.75, 4.79 (AB-q, J=12 Hz, 2H); about 5.50 (unsharp'q, 2 H). IR (KBr-disc, values in cm.sup.-1): 1865, 1630, 1550, 1420, 1360, 1135, 1065, 1018.
In zwitter-ionic form 7.beta.-amino-3-bromomethyl-3-cephem-4-carboxylic acid was also obtained, albeit in much less pure state, from not purified 7.beta.-phenylacetamido-3-bromomethyl-4-carboxylic acid 1.beta.-oxide by, sequentially, silylation with trimethylchlorosilane and N,N-dimethylaniline, sulphoxide reduction and imidechloride formation with phosphorus pentachloride and N,N-dimethylaniline (with or without partial substitution of N,N-dimethylaniline by cis-cyclooctene), treatment with isobutanol and thereafter with a minimal volume of water, and finally isolation of the precipitated compound by addition of sodiumbicarbonate to pH 3.5.
IR (KBr-disc, values in cm.sup.-1): 1860, 1620, 1540, 1410, 1350, 1125, 1060, 1015.
EXAMPLE X
Preparation of 3-bromomethyl-4-carboxy-7.beta.-isopropylideneammonio-3-cephem chloride from a solution of 7.beta.-phenylacetamido-3-methyl-3-cephem-4-carboxylic acid 1.beta.-oxide under various reaction conditions
a) According to the process described in Example Ia, 287 mmoles of 7.beta.-phenylacetamido-3-methyl-3-cephem-4-carboxylic acid 1.beta.-oxide in 2 l dichloromethane were converted into a stock-solution containing trimethylsilyl 7.beta.-phenylacetamido-3-bromomethyl-3-cephem-4-carboxylate 1.beta.-oxide and a minor amount of trimethylsilyl 7.beta.-phenylacetamido-2-bromo-3-bromomethyl-3-cephem-4-carboxylate 1.beta.-oxide and brought to -30.degree. C. 5.0 ml of tributyl phosphite was added to a fourth part by weight of this stock solution during 20 minutes at -25.degree. C.--30.degree. C. to reduce the dibromide into the monobromide.
The solution obtained hereinabove was cooled down to -60.degree. C., followed by the introduction of 1 ml of N,N-dimethylaniline, 1.5 ml of N,N-dimethylformamide, 7.5 ml of cis-cyclooctene and 15 g of phosphorus pentachloride, whereupon the mixture was stirred for 30 minutes at -55.degree. C.--60.degree. C.
15 ml of N,N-dimethylaniline and 15 g of phosphorus pentachloride were added, followed by 120 minutes stirring at -50.degree. C.--55.degree. C. Subsequently 52.5 ml of isobutanol were added, followed by 60 minutes stirring at -25.degree. C.--30.degree. C.
b) The solution of 7.beta.-ammonio-3-bromomethyl-4-carboxy-3-cephem chloride was divided in seven parts by weight. To each part 90 ml of acetone, together with the additives indicated in the table A, were added and the temperature was raised to 20.degree. C.-25.degree. C., then cooled down to 5.degree. C. and stored overnight in the refrigerator. The precipitate was collected by filtration, washed with dichloromethane and acetone and dried in vacuo to constant weight at 20.degree. C.-25.degree. C. The results have been mentioned in table A. The purity of the isolated material has been established by quantitative assay being 70%. The proportion 3-bromomethyl substituted compounds (Br) versus 3-chloromethyl substituted compounds (C1) and the yield of 3-bromomethyl-4-carboxy-7.beta.-isopropylideneammonio-3-cephem chloride, were given in each entry.
TABLE A______________________________________ proportion yield yieldadditive Br:Cl (g) Br (%)______________________________________1. -- 70:30 1.91 24.72. 1 ml H.sub.2 O 84:16 2.03 31.53. 5 ml H.sub.2 SO.sub.4, conc 94:06 1.61 27.94. 5 ml H.sub.3 PO.sub.4, 85% 85:15 1.85 29.15. 5 ml HBr, 47% 94:06 1.96 34.06. 10 ml HBr, 47% 94:06 2.03 35.37. 15 ml HBr, 47% 93:07 1.85 31.8______________________________________
EXAMPLE XI
Preparation of 3-bromomethyl-4-carboxy-7.beta.-isopropylidene-3-cephem chloride, from a solution of 7.beta.-phenylacetamido-3-methyl-3-cephem-4-carboxylic acid 1.beta.-oxide under various reaction conditions
Exactly in the same way as described in example X 3-bromomethyl-4-carboxy-7.beta.-isopropylideneammonio-3-cephem chloride was prepared except that the additives were introduced 15 minutes before the acetone. The results are given in table B.
TABLE B______________________________________ proportion yield yieldadditive Br:Cl (g) Br (%)______________________________________1. -- 49:51 2.33 21.12. 1 ml H.sub.2 O 76:24 2.24 31.53. 5 ml H.sub.2 SO.sub.4, conc 91:09 2.19 36.84. 5 ml H.sub.3 PO.sub.4, conc 80:20 2.22 32.85. 5 ml HBr, 47% 90:10 2.27 37.76. 10 ml HBr, 47% 89:11 2.23 36.77. 15 ml HBr, 47% 88:12 2.08 33.8______________________________________
EXAMPLE XII
Preparation of 4-carboxy-3-chloromethyl-7.beta.-isopropylideneammonio-3-cephem chloride from a solution of 7.beta.-phenylacetamido-3-methyl-3-cephem-4-carboxylic acid 1.beta.-oxide under various reaction conditions
Exactly in the same way as described in example X 4-carboxy-3-chloromethyl-7.beta.-isopropylideneammonio-3-cephem chloride was prepared. The results are given in table C.
TABLE C______________________________________ proportion yield yieldadditive Cl:Br (g) Cl (%)______________________________________1. -- 42:58 2.01 17.72. 2.5 ml DMA* 56:44 1.96 23.03. 2.5 ml DMA* + 2.5 g 58:42 2.02 24.6 PCl.sub.54. 2.5 ml PCl.sub.5 43:57 1.96 17.75. 15 ml HCl 94:06 1.40 27.6______________________________________ *DMA = N,Ndimethylaniline.
EXAMPLE XIII
Preparation of 7.beta.-amino-3-[[(1-methyl-tetrazol-5-yl)thio]methyl]-3-cephem-4-carboxylic acid from 3-bromomethyl-4-carboxy-7.beta.-isopropylideneammonio-3-cephem bromide
800 mg (79% purity; 1.53 mmoles) of 3-bromomethyl-4-carboxy-7.beta.-isopropylideneammonio-3-cephem bromide were added portionwise over about 30 minutes to a stirred solution of 232 mg (2.0 mmoles) of 5-mercapto-1-methyl-tetrazole in 10 ml of a 1:1 mixture of propanol-2 and water at 25.degree. C. After adjusting the pH to 2.6 with 3.3 ml of 1N sodium hydroxide solution, the reaction mixture was stirred for another 45 minutes. After centrifugation, washing with a 1:1 mixture of water and acetone and with acetone, and drying in vacuo at 45.degree. C. 543 mg of the title compound were obtained (purity according to HPLC: 82%; yield 88%).
IR (KBr-disc; values in cm.sup.-1): 1800, 1615, 1535, 1410, 1350, 1290, 1275, 1255, 1170, 1120, 1060, 1010, 800, 790. PMR (DCOOD; .delta.-values in ppm, 360 Mc, int. ref. TMS): 3.92 (s, 2H); 4.18 (s, 3H); 4.54 (s, 2H); 5.46 (d, 1H; J=4.5 Hz); 5.48 (d, 1H; J=4.5 Hz).
EXAMPLE XIV
Preparation of 7.beta.-amino-3-[[(1,3,4-thiadiazol-2-yl)thio]methyl]-3-cephem-4-carboxylic acid from 3-bromomethyl-4-carboxy-7.beta.-isopropylideneammonio-3-cephem bromide
800 mg (79% purity; 1.53 mmoles) of 3-bromomethyl-4-carboxy-7.beta.-isopropylideneammonio-3-cephem bromide were added portionwise over about two hours to a well stirred solution of 236 mg (2.0 mmoles) of 2-mercapto-1,3,4-thiadiazole in 10 ml of a 1:1 mixture of propanol-2 and water at room temperature, while the pH was kept at 2.5 with 1N sodium hydroxide solution. After stirring for another 30 minutes at pH 2.5 the product was isolated by centrifugation and washed with a 1:1 mixture of water and acetone and with acetone, dried in vacuo at 45.degree. C., thus giving 586 mg of the title compound.
IR (KBr-disc; values in cm.sup.-1): 1805, 1620, 1545, 1415, 1370, 1350, 1065 and 805. PMR (CF.sub.3 COOD; .delta.-values in ppm, 360 Mc, int. ref. TMS): 3.60 (s, 2H); 4.43 and 4.58 (AB-q, 2H; J=14.0 Hz); 5.13 (s, 2H); 9.92 (s, 1H).
EXAMPLE XV
Preparation of 7.beta.-amino-3-[[(1,2,3-triazol-5-yl)thio]methyl]-3-cephem-4-carboxylic acid from 3-bromomethyl-4-carboxy-7.beta.-isopropylideneammonio-3-cephem bromide
To a solution of 246 mg (2.0 mmoles) of the sodium salt of 1,2,3-triazol-5-yl-thiol in 3 ml of water 7 ml of acetone were added. After adjusting the pH to 1.7 with 0.5 ml of 1N HCl, 800 mg (purity 79%; 1.53 mmoles) of 3-bromomethyl-4-carboxy-7.beta.-isopropylideneammonio-3-cephem bromide were added portionwise over about 85 minutes while the pH was kept at 1.8 with 1N NaOH. After stirring for another 25 minutes the pH was adjusted to 2.2. After centrifugation, washing with 7.5 ml of a 1:1 mixture of water and acetone and with acetone, and drying in vacuo at 45.degree. C., 378 mg of the title compound was obtained (purity according to HPLC 78%; overall yield 61.5%). The structure was confirmed by spectroscopic means.
EXAMPLE XVI
Preparation of 7.beta.-amino-3-[[(5-methyl-1,3,4-thiadiazol-2-yl)thio]methyl] -3-cephem-4-carboxylic acid 3-bromomethyl-4-carboxy-7.beta.-isopropylideneammonio-3-cephem bromide
800 mg (purity: 79%; 1.53 mmoles) of 3-bromomethyl-4-carboxy-7.beta.-isopropylideneammonio-3-cephem bromide were added to a solution of 265 mg (2.0 mmoles) of 2-mercapto-5-methyl-1,3,4-thiadiazole in 15 ml of a 1:1 mixture of acetone and water at room temperature. The reaction mixture was shaken in an ultrasonic bath for 5 minutes and after one hour for another 5 minutes, diluted with a few milliliters of acetone and centrifugated. After washing the precipitate with acetone and diethylether and drying in vacuo 500 mg of the title compound were obtained with a purity of 84%. The overall yield was 80%.
IR (KBr-disc; values in cm.sup.-1): 1805, 1620, 1545, 1515, 1410, 1380, 1150, 1060, 800 and 790. PMR (CF.sub.3 COOD; 360 Mc, int. ref. TMS; .delta.-values in ppm): 2.83 (s, 3H); 3.54 and 3.62 (AB-q, 2H; J=16.2 Hz); 4.37 and 4.55 (AB-q, 2H; J=13.8 Hz); 5.11 (d, 1H; J=4.5 Hz); 5.14 (d, 1H; J=4.5 Hz).
EXAMPLE XVII
Preparation of 7.beta.-amino-3-[[(5-methyl-1,3,4-thiadiazol-2-yl)thio]methyl]-3-cephem-4-carboxylic acid from 3-bromo/chloromethyl-4-carboxy-7.beta.-cyclopentylideneammonio-3-cephem bromide
According to the procedure of Example XVI 454 mg of 7.beta.-amino-3-[[(2-methyl-1,3,4-thiadiazol-2-yl)thio]methyl]-3-cephem-4-carboxylic acid were obtained by reaction of a mixture of 3-bromomethyl-4-carboxy-7.beta.-cyclopentylideneammonio-3-cephem chloride and the corresponding chloromethyl compound (800 mg); purity: 66% bromo compound, 20% chloro compound; 1.69 mmoles) with 265 mg of 2-mercapto-5-methyl-1,3,4-thiadiazole. Purity 83%, yield 65%.
EXAMPLE XVIII
Preparation of 7.beta.-amino-3-[[(5-methyl-1,3,4-thiadiazol-2-yl)thio]methyl]-3-cephem-4-carboxylic acid from 7.beta.-amino-3-bromomethyl-3-cephem-4-carboxylic acid
A solution of 1N-sodiumhydroxide (about 3.4 ml) was added to 60 mg (0.45 mmol) of 2-mercapto-5-methyl-1,3,4-thiadiazole in 2 ml water till the solution was clear at a pH of 7.5. 100 mg (0.34 mmol) of 7.beta.-amino-3-bromomethyl-3-cephem-4-carboxylic acid were added portionwise. About 2.8 ml of a solution of 0.1N NaOH was necessary to maintain the pH at about 7.5. Then the pH of the solution was adjusted to 4 with 3.6 ml of a solution of 0.1N HCl. The precipitate formed was filtered and washed with water and acetone. After drying in vacuo 61 mg of 7.beta.-amino-3-[[(5-methyl-1,3,4-thiadiazol-2-yl)thio]methyl]-3-cephem-4-carboxylic acid were obtained with a purity of 62.5%. The overall yield was 32.5%.
IR (KBr-disc, values in cm.sup.-1): about 3410, 1800, 1620, about 1540, 1412, 1350, 1060.
EXAMPLE XIX
Preparation of 7.beta.-amino-3-[[(6-hydroxy-2-methyl-5-oxo-1,2,4-triazol-3-yl)thio]methyl]-3-cephem-4-carboxylic acid from 3-bromomethyl-4-carboxy-7.beta.-isopropylideneammonio-3-cephem bromide
800 mg (79% purity; 1.53 mmoles) of 3-bromomethyl-4-carboxy-7.beta.-isopropylideneammonio-3-cephem bromide were added portionwise over 80 minutes to a stirred solution of 318 mg (2.0 mmoles) of 6-hydroxy-1-mercapto-2-methyl-5-oxo-1,2,4-triazole in 10 ml of a 1:1 mixture of acetone and water at room temperature, while the pH was kept at 1.95 with a IN NaOH solution (3.2 ml). After stirring for another 15 minutes the crystalline product was separated by centrifugation, washed with a mixture of acetone and water, with acetone and dried in vacuo, thus yielding 626 mg of the title compound. Purity 92%; yield 100%.
IR (KBr-disc; values in cm.sup.-1): 1795, 1640, 1615, 1585, 1410, 1345, 1290, 1220, 1100, 800 and 785. PMR (D.sub.2 O+NaHCO.sub.3 ; 360 Mc, int. ref. TMS; .delta.-values in ppm): 3.69 (s, 3H); 3.49 and 3.71 (AB-q, 2H; J=18 Hz); 4.09 and 4.40 (AB-q, 2H; J=13.3 Hz); 4.80 (d, 1H; J=5 Hz); 5.10 (d, 1H; J=5 Hz).
EXAMPLE XX
Preparation of 7.beta.-amino-3-[[(6-hydroxy-2-methyl-5-oxo-1,2,4-triazol-3-yl)thio]methyl]-3-cephem-4-carboxylic acid from 3-bromo/chloromethyl-4-carboxy-7.beta.-cyclohexylideneammonio-3-cephem chloride
According to the procedure of Example XVI 703 mg of 7.beta.-amino-3-[[(6-hydroxy-2-methyl-5-oxo-1,2,4-triazol-3-yl)thio]methyl]-3-cephem-4-carboxylic acid were obtained starting from a mixture of 3-bromomethyl-4-carboxy-7.beta.-cyclohexylideneammonio-3-cephem chloride and the corresponding 3-chloromethyl compound (1.3 g; purity: 69% bromo compound, 8.4% chloro compound; 2.76 mmoles) and 6-hydroxy-1-mercapto-2-methyl-5-oxo-1,2,4-triazole in 16 ml of a 1:1 mixture of acetone and water. The reaction temperature was 40.degree. C. The purity of the final product was 92.5%. The yield was 64%.
EXAMPLE XXI
Preparation of 7.beta.-ammonio-4-carboxy-3-[(1-pyridinio)-methyl]-3-cephem dichloride from 3-bromomethyl-4-carboxy-7.beta.-isopropylideneammonio-3-cephem
A mixture of 4.63 g (purity 85%; 9.5 mmoles) of 3-bromomethyl-4-carboxy-7.beta.-isopropylideneammonio-3-cephem bromide, 50 ml of acetonitrile, 50 ml of acetone and 10 ml (40 mmoles) of N,O-bis(trimethylsilyl)acetamide was stirred under nitrogen at room temperature for 15 minutes and for 30 minutes at 0.degree. C. After adding 10 ml (124 mmoles) of pyridine and stirring for 3 hours at 0.degree. C. a clear orange solution was obtained. After pouring out the reaction mixture into a mixture of 5 ml of water, 10 ml of isopropanol and 5 ml of toluene, the solvents were evaporated. The residual solid was dissolved in 35 ml of a 1N hydrochloric acid solution at 0.degree. C. After adding slowly 195 ml of isopropanol and stirring overnight at 0.degree. C., the precipitate formed was centrifugated, washed with isopropanol and diethylether and dried in vacuo, yielding 3.55 g of the title compound. The yield was 92%.
IR (KBr-disc; values in cm.sup.-1): 1795, 1610, 1487, 1395, 1335, 1280, 1240, 1150, 1050, 800, 770 and 680. PMR (360 MHz; D.sub.2 O; .delta.-values in ppm): 3.40 and 3.77 (2 xd, 2H; J=18 Hz); 5.26 (d, 1H; J=4.8 Hz); 5.35 (d, 1H; J=4.8 Hz); 5.45 and 5.64 (2 xd, 2H; J=14.4 Hz); 8.16 (t, 2H; J about 6 Hz); 8.64 (t, 1H; J about 6 Hz); 9.00 (d, 2H; J about 6 Hz).
EXAMPLE XXII
Preparation of 7.beta.-ammonio-4-carboxy-3-[(1-pyridinio)methyl]-3-cephem dichloride from 3-bromomethyl-4-carboxy-7.beta.-isopropylideneammonio-3-cephem bromide
A mixture of 463 mg (purity 85%, 0.95 mmole) of 3-bromomethyl-4-carboxy-7.beta.-isopropylideneammonio-3-cephem bromide, 5 ml of acetone, 5 ml of acetonitrile and 1.1 ml (4 mmoles) of N,O-bis(trimethylsilyl)trifluoroacetamide was stirred under nitrogen for 30 minutes at 0.degree. C. After addition of 1 ml of pyridine and stirring for three and a half hour the conversion into the title product was quantitative according to HPLC-analysis.
2 ml of water, 2 ml of isopropanol and 2 ml of toluene was added, the mixture was concentrated in vacuo to dryness and the remaining residue in 3.5 ml of a 1N hydrochloric acid solution. After adding slowly 20 ml of isopropanol and stirring for one and a half hour the mixture was centrifugated. Washing the precipitate with isopropanol and ether and drying in vacuo gave 364 mg of the title product with a purity of 93%. The yield was 98%.
EXAMPLE XXIII
Preparation of 7.beta.-ammonio-4-carboxy-3-[(1-methylpyrrolidin-1-ylio)-methyl]-3-cephem dichloride from 3-bromomethyl-4-carboxy-7.beta.-isopropylideneammonio-3-cephem bromide
463 mg (purity 85%, 0.95 mmole) of 3-bromomethyl-4-carboxy-7.beta.-isopropylideneammonio-3-cephem bromide was silylated in a mixture of 5 ml of acetone and 5 ml of acetonitrile with 2 ml (8 mmoles) of N,O-bis(trimethylsilyl)acetamide under nitrogen at room temperature for 15 minutes. After cooling down and stirring for another 30 minutes a 0.degree. C., a mixture of 0.24 ml (2.3 mmoles) of N-methylpyrrolidine, 20 ml of acetone and 20 ml of acetonitrile was added dropwise over a period of 60 minutes and stirring was continued at 0.degree. C.
After addition of 1.5 ml of a 1N hydrochloric acid solution, 5 ml of isopropanol and 5 ml of toluene, the reaction mixture was concentrated in vacuo. Then 2.5 ml of a 1N hydrochloric acid solution and 30 ml of isopropanol was added and the mixture was concentrated to a volume of 20 ml and stored at 0.degree. C. The crystalline precipitate formed was obtained by centrifugation. Washing and drying in vacuo gave 313 mg of the title compound with a purity of 72%. The yield was 64%.
IR (KBr-disc, values in cm.sup.-1): 1790, 1640, 1620, 1600, 1400, 1345, 1290, 1145, 1065, 925 and 800. PMR (360 MHz; D.sub.2 O; .delta.-values in ppm): 2.25 (m, 4 Hz); 3.01 (s, 3H); 3.57 (m, 4 Hz); 3.62 and 3.98 (2 xd, 2H; J=18 Hz); 4.11 and 4.75 (2 xd, 2H; J=13.2 Hz); 5.23 (d, 1H; J=4.5 Hz); 5.44 (d, 1H; J=4.5 Hz).
EXAMPLE XXIV
Preparation of 7.beta.-ammonio-4-carboxylate-3-[(cyclopenta[b]pyridin-1-ylio)methyl]-3-cephem bromide from 3-bromomethyl-4-carboxy-7.beta.-cyclohexylideneammonio-3-cephem bromide
A mixture of 510 mg (purity 85%, 0.95 mmole) of 3-bromomethyl-4-carboxy-7.beta.-cyclohexylideneammonio-3-cephem bromide, 5 ml of methylene chloride and 2 ml (8 mmoles) of N,O-bis(trimethylsilyl)acetamide was stirred for 15 minutes at room temperature and for 30 minutes at 0.degree. C. Then with continuous stirring 0.28 ml of 2,3-cyclopenta[b]pyridine in 5 ml of methylene chloride was added during 10 minutes at 0.degree. C. and stirring was continued for another 3 hours, the temperature for the last 30 minutes being 20.degree. C. After concentrating the reaction mixture in vacuo and dissolving the residue in a mixture of 1 ml of water, 0.3 ml of methanol and 0.5 ml of a 4N hydrobromic acid solution, 12 ml of isopropanol was added slowly. After standing overnight 370 mg of the title compound was obtained by centrifugation, washing with acetone and drying.
IR (KBr-disc, values in cm.sup.-1): 1805, 1785, 1645, 1620, 1595, 1472, 1417, 1350, 1295, 1285, 1146, 1058, 820 and 800. PMR (360 MHz; D.sub.2 O; .delta.-values in ppm): 2.18 (m, 2H); 3.11 (t, 2H; J about 7.5 Hz); 3.21 (t, 2H; J about 7.5 Hz); 3.47 and 3.65 (2 xd, 2H; J=18 Hz); 5.23 (s, 2H); 5.58 and 5.65 (2 xd, 2H; J=13.2 Hz); 7.92 (t, 1H); 8.43 (d, 1H; J about 9 Hz).
EXAMPLE XXV
Preparation of 7.beta.-ammonio-4-carboxylate-3-[(quinuclidin-1-ylio)-methyl]-3-cephem bromide from 3-bromomethyl-4-carboxy-7.beta.-isopropylideneammonio-3-cephem bromide
A mixture of 525 mg (purity 85%, 0.95 mmole) of 3-bromomethyl-4-carboxy-7.beta.-isopropylideneammonio-3-cephem bromide, 2 ml (8 mmoles) of N,O-bis(trimethylsilyl)acetamide and 10 ml of 1,1,2-trichlorotrifluoroethane was stirred under nitrogen for 45 minutes at 0.degree. C. With continuous stirring and maintaining the temperature at 0.degree. C. 266 mg (2.4 mmoles) of quinuclidine in 10 ml of 1,1,2-trichlorotrifluoroethane was added over a period of 2 hours. After stirring for another hour 5 ml of isopropanol, 1 ml of methanol and 4 ml of a 1N hydrochloric acid solution was added with vigorous stirring and furthermore a small amount of water until a clear solution was obtained. After separation of the layers and extracting the organic layer with 2 ml of water the combined water layers were concentrated in vacuo until the volume of the reaction mixture was about 2 ml. Adding slowly 12 ml of isopropanol, filtering off the crystalline precipitate formed, washing and drying yielded 384 mg of the title product with a purity of 89%. The yield was 87%.
IR (KBr-disc, values in cm.sup.-1): 3120, 2940, 2885, 2130, 1790, 1620, 1600, 1492, 1466, 1415, 1400, 1390, 1380, 1345, 1290, 1195, 1142, 1075, 935, 792 and 452. PMR (360 MHz; D.sub.2 O; .delta.-values in ppm, determined in the presence of maleic acid): 1.7 (m, 6H); 1.9 (m, 1H); 3.2-3.4 (m, 6H); 3.49 and 3.61 (2.times.d, 2H; J about 17 Hz); 3.95 and 4.40 (2.times.d, 2H; J about 14 Hz); 4.98 (d, 1H; J=4.5 Hz); 5.23 (d, 1H; J=4.5 Hz).
EXAMPLE XXVI
Preparation of 3-bromo/chloromethyl-4-carboxy-7.beta.-isobutylideneammonio-3-cephem chloride from 7.beta.-phenylacetamido-3-methyl-3-cephem-4-carboxylic acid 1.beta.-oxide
After treating 373 g of a solution obtained as described in example Ia containing a mixture of bromo cephem silyl esters with 3.75 ml (13.9 mmoles) of tributyl phosphite at -37.degree. C. for one hour the reduction of the sulphoxide was carried out with 4.1 ml (31.4 mmoles) of cyclooctene, 0.5 ml (3.9 mmoles) of N,N-dimethylaniline, 0.8 ml (10.4 mmoles) of N,N-dimethylformamide and 7.5 g (36.0 mmoles) of phosphorus pentachloride at -50.degree. C. for 50 minutes. After adding 7.7 ml (60.7 mmoles) of N,N-dimethylaniline and 7.5 g (36.0 mmoles) of phosphorus pentachloride and stirring for 195 minutes at -50.degree. C. a mixture of 30 ml (0.32 mmol) of isobutanol and 125 ml (1.39 mmol) of ethyl methyl ketone was added. Stirring was continued for 30 minutes without cooling and the reaction mixture was kept at 0.degree. C. for 72 hours. Thus the precipitate formed was filtered off and dried in vacuo yielding 7.48 g of a mixture of the title compounds. The ratio of the bromo compound to the chloro compound was 2:1. The overall yield starting from 7.beta.-phenylacetamido-3-methyl-3-cephem-4-carboxylic acid 1.beta.-oxide amounted to 33%.
PMR-spectrum of the bromomethyl compound (360 MHz; CF.sub.3 CO.sub.2 D; .delta.-values in ppm): 1.22 (t, 3H); 2.53 (s, 3H); 2.89 (m, 2H); 4.28 and 4.34 (2.times.d, 2H; J=10.8 Hz); 5.34 (d, 1H; J=4.5 Hz); 5.81 (d, 1H; J=4.5 Hz). PMR-spectrum of the chloromethyl compound (ibidem): 1.22 (t, 3H); 2.53 (s, 3H); 2.89 (m, 2H); 4.42 (s, 2H); 5.34 (d, 1H; J=4.5 Hz); 5.83 (d, 1H; J=4.5 Hz).
EXAMPLE XXVII
Preparation of 3-bromo/chloromethyl-4-carboxy-7.beta.-cyclopentylideneammonio-3-cephem chloride from 7.beta.-phenylacetamido-3-methyl-3-cephem-4-carboxylic acid 1.beta.-oxide
706 g of a stock-solution obtained as described in example Ia containing a mixture of bromo cephem silyl esters were treated with 7.1 ml (26.2 mmoles) of tributyl phosphite and subsequently with 7.7 ml (59.1 mmoles) of cyclooctene, 1 ml (7.9 mmoles) of N,N-dimethylaniline, 1.5 ml (19.5 mmoles) of N,N-dimethylformamide and 14.3 g (68.7 mmoles) of phosphorus pentachloride in the usual way. Then 14.65 ml (115.5 mmoles) of N,N-dimethylformamide and 14.3 g of phosphorus pentachloride were added and stirring was continued at -50.degree. C. for 210 minutes at -50.degree. C. Then the reaction mixture was cooled down to -70.degree. C. and a mixture of 55 ml (592 mmoles) of isobutanol and 25 ml (282 mmoles) of cyclopentanone was added. After stirring for 30 minutes at -40.degree. C. followed by standing for 30 hours at -25.degree. C. another 100 ml (1.13 mmol) of cyclopentanone were added and the temperature was allowed to rise to 28.degree. C. After a further 4 hours at 2.degree. C. the resultant precipitate was collected, washed with cyclopentanone and diethyl ether, and dried in vacuo to give 14.4 g of a mixture of the title compounds. The overall yield starting from 7.beta.-phenylacetamido-3-methyl-3-cephem-4-carboxylic acid 1.beta.-oxide amounted to 45%. The ratio of the bromo compound to the chloro compound was 3:1.
PMR-spectrum of the bromomethyl compound (360 MHz; CF.sub.3 COOD; .delta.-values in ppm): 1.96 (m, 4H); 2.95 (m, 4H); 4.30 (s, 2H); 5.30 (d, 1H; J=4.5 Hz); 5.70 (d, 1H; J=4.5 Hz). PMR-spectrum (ibidem) of the chloromethyl compound: 1.96 (b, 4H); 2.95 (m, 4H); 4.39 (s, 2H); 5.30 (d, 1H; J=4.5 Hz); 5.72 (d, 2H; J=4.5 Hz).
EXAMPLE XXVIII
Preparation of 3-bromo/chloromethyl-4-carboxy-7.beta.-cyclohexylideneammonio-3-cephem chloride from 7.beta.-phenylacetamido-3-methyl-3-cephem-4-carboxylic acid 1.beta.-oxide
455 g of a stock solution obtained as previously described in example Ia containing a mixture of bromo cephem silyl esters were treated with 4.4 ml (16.3 mmoles) of tributyl phosphite at -50.degree. C. for 45 minutes. After adding 4.75 ml (36.4 mmoles) of cyclooctene, 0.65 ml (5.1 mmoles) of N,N-dimethylaniline, 0.9 ml (11.7 mmoles) of N,N-dimethylformamide and 8.8 g (42.3 mmoles) of phosphorus pentachloride stirring was continued at -50.degree. C. for 45 minutes. Then 9.1 ml (71.8 mmoles) of N,N-dimethylaniline and 8.85 g (42.5 mmoles) of phosphorus pentachloride were added, the reaction mixture was stirred at -45.degree. C. for 2 hours and a mixture of 34 ml of isobutanol and 20 ml (193 mmoles) of cyclohexanone was added, carefully maintaining the temperature below -50.degree. C. After stirring for another 90 minutes at -50.degree. C. the reaction mixture was kept overnight at 2.degree. C. The resultant precipitate was filtered off, washed with acetonitrile and diethylether and dried in vacuo to give 11 g of a mixture of the title compounds. The ratio of the bromo compound to the chloro compound was 7:1. The overall yield starting from 7.beta.-phenylacetamido-3-methyl-3-cephem-4-carboxylic acid 1.beta.-oxide amounted to 48%.
PMR-spectrum (360 MHz; CF.sub.3 COOD; .delta.-values in ppm) of the bromomethyl compound: 1.64 (m, 2H); 1.93 (m, 4H); 2.79 (m, 4H); 4.27 and 4.34 (2.times.d, 2H; J=10.5 Hz); 5.34 (d, 1H; J=4.5 Hz); 5.88 (d, 1H; J=4.5 Hz). PMR-spectrum (ibidem) of the chloromethyl compound: 1.64 (m, 2H); 1.93 (m, 4H); 2.79 (m, 4H); 4.39 and 4.45 (2.times.d, 2H; J=12.6 Hz); 5.34 (d, 1H; J=4.5 Hz); 5.91 (d, 1H; J=4.5 Hz).
EXAMPLE XXIX
Preparation of 3-bromo/chloromethyl-4-carboxy-7.beta.-cyclohexylideneammonio-3-cephem bromide from 7.beta.-phenylacetamido-3-methyl-3-cephem-4-carboxylic acid 1.beta.-oxide
399 g of a stock solution obtained as previously described in example Ia containing a mixture of bromo cephem silyl esters were treated with 4.0 ml (14.8 mmoles) of tributyl phosphite at -50.degree. C. for 50 minutes. After adding 4.3 ml (33.0 mmoles) of cyclooctene, 0.5 ml (3.9 mmoles) of N,N-dimethylaniline, 0.8 ml (10.4 mmoles) of N,N-dimethylformamide and 7.9 g (37.9 mmoles) of phosphorus pentachloride stirring was continued at about -47.degree. C. for 40 minutes. Then 4.9 ml (38.7 mmoles) of N,N-dimethylaniline and 7.9 g (37.9 mmoles) of phosphorus pentachloride were added, the reaction mixture was stirred at -50.degree. C. for 1 hour and 35 minutes and 60 ml (650 mmoles) of isobutanol was added. The temperature rised to -35.degree. C. for just a moment, then the mixture was cooled again to -50.degree. C. Then 20 ml of a solution of hydrogen bromide, 47% (174 mmoles HBr) and thereafter 50 ml (482 mmoles) of cyclohexanone were added. After stirring for another 2 hours at -50.degree. C. the reaction mixture was kept for 6 days at 2.degree. C. The resultant precipitate was filtered off, washed with cyclohexanone and acetone and dried in vacuo to give 9.9 g of a mixture of the title compounds. The ratio of the bromo compound to the chloro compound was 9:1. The overall yield starting from 7.beta.-phenylacetamido-3-methyl-3-cephem-4-carboxylic acid 1.beta.-oxide amounted to 46%.
IR-spectrum (KBr-disc; values in cm.sup.-1): 1798, 1702, 1658, 1621, 1515, 1406, 1350, 1211, 1194, 1093, 1060, 996, 987, 702, 620. NMR-spectrum (360 MHz; CF.sub.3 CO.sub.2 D; .delta.-values in ppm; int. ref. maleic acid; .delta.=6.35): 1.5-2.1 (m, 6H); 2.6-2.9 (m, 4H); 3.56 (s, 2H); 4.27, 4.33 (AB-q or d, 2H; J=10.5 Hz); 5.32 (d, 1H; J=4.5 Hz); 5.86 (d, 1H; J=4.5 Hz).
EXAMPLE XXX
Influence of the addition of a quaternary ammonium compound on the chloro/bromo ratio of the preparation of 4-carboxy-3-chloro/bromomethyl-7.beta.-cyclohexylideneammonio-3-cephem chloride from 7.beta.-phenylacetamido-3-methyl-3-cephem-4-carboxylic acid 1.beta.-oxide
434.4 g of a stock solution obtained as previously described containing a mixture of bromo cephem silyl esters were treated with 4.2 ml (15.5 mmoles) of tributyl phosphite at -55.degree. C. for 1 hour. The reduction of the sulphoxide moiety was carried out with 4.55 ml (34.9 mmoles) of cyclooctene, 0.6 ml (4.7 mmoles) of N,N-dimethylaniline, 0.9 ml (11.7 mmoles) of N,N-dimethylformamide and 8.4 g (40.3 mmoles) of phosphorus pentachloride in the usual way. After cooling the reaction mixture down to -66.degree. C., stirring was continued and a mixture of 20 g (95.2 mmoles) of tetraethyl ammonium bromide, 32 ml of isobutanol, 25 ml of methylene chloride and 20 ml (193 mmoles) of cyclohexanone was added. After the reaction mixture was warmed up to 0.degree. C. over 70 minutes, it was maintained at 2.degree. C. overnight. The resultant precipitate was filtered off, washed with methylene chloride and dried to give 9.76 g of a mixture of the title compounds. The ratio of the bromo compound to the chloro compound was 2:3. The overall yield starting from 7.beta.-phenylacetamido-3-methyl-3-cephem-4-carboxylic acid 1.beta.-oxide amounted to 48%.
EXAMPLE XXXI
Preparation of 7.beta.-amino-3-bromomethyl-3-cephem-4-carboxylic acid from 3-bromomethyl-4-carboxy-7.beta.-isopropylideneammonio-3-cephem bromide
In a centrifuge-tube, placed in an ultrasonic bath, 1000 mg (purity 79%, 90% bromo compound, 1.91 mmol) of 3-bromomethyl-4-carboxy-7.beta.-isopropylideneammonio-3-cephem bromide were dissolved in 15 ml 2-methoxy ethanol. After adding 1.0 ml of a 2N hydrogen bromide solution this mixture was shaken and stirred during 10-15 minutes and the solution became clear. Stirring and shaking a solution of 0.60 ml (4.73 mmmoles) of N,N-dimethylaniline in 15 ml acetonitrile was dropped to the mixture.
The precipitate was centrifugated and washed with 25 ml 80% acetonitrile, acetonitrile and ether, respectively. After drying in a nitrogen stream and then in vacuo the yield of 7.beta.-amino-3-bromomethyl-3-cephem-4-carboxylic acid was 647.6 mg with a purity of 82.7%. The overall yield was 95.5%.
IR (KBr-disc, values in cm.sup.-1): 3445, 3180, 1800, 1616, about 1535, 1410, 1350, 1290, 1210, 1150, 1114, 1059, 1001, 800, 791, 519, 432.
EXAMPLE XXXII
Preparation of 7.beta.-amino-3-chloromethyl-3-cephem-4-carboxylic acid from 4-carboxy-3-chloromethyl-7.beta.-isopropylideneammonio-3-cephem chloride
In a centrifuge-tube, placed in an ultrasonic bath, 400 mg (purity 93.9%, 1.15 mmol) of 7.beta.-isopropylideneammonio-4-carboxy-3-chloromethyl-3-cephem chloride were dissolved in 10 ml 2-methoxyethanol. After adding 1.5 ml of 2N hydrogen chloride and shaking and trilling during about 25 minutes a clear solution was obtained. During half an hour 0.45 ml (3.55 mmoles) of N,N-dimethylaniline dissolved in 15 ml acetonitrile was dropped to the mixture.
The precipitate was centrifugated and washed with 25 ml 80% acetonitrile, acetonitrile and ether, respectively. After drying in a nitrogen stream and then in vacuo the yield of 7.beta.-amino-3-chloromethyl-3-cephem-4-carboxylic acid was 207.7 mg with a purity of 95.3%. The overall yield was 68.9%.
IR (KBr-disc, values in cm.sup.-1); about 3440, 3180, 1804, 1622, about 1540, 1412, 1351, 1293, 1257, 1123, 1061, 1010, 889, 802, 792, 521, 430. PMR (CF.sub.3 COOD, .delta.-values in ppm, 360 Mc, int. ref. TMS): 3.52, 4.40, 4.43 (2H; 2.times.d, J=11.9 Hz), 5.13, 5.15 (2H; 2.times.d, J=4.5 Hz).
EXAMPLE XXXIII
Preparation of 7.beta.-ammonio-3-chloro/bromomethyl-3-cephem-4-carboxylate from 3-bromo/chloromethyl-4-carboxy-7.beta.-isopropylideneammonio-3-cephem chloride
A solution of 5 g (9.49 mmoles) of 3-chloro/bromomethyl-4-carboxy-7.beta.-isopropylideneammonio-3-cephem chloride (bromomethyl:chloromethyl=45:26) in 75 ml 2-methoxyethanol and 25 ml of dry acetone was treated with charcoal. After washing with 25 ml of acetone, slowly 30 ml of a mixture of 11.8 mmoles of N,N-dimethylaniline in acetone were dropped into the filtrate. After stirring for ten minutes the precipitate was filtered and washed with acetone and ether respectively. The yield after drying in vacuo was 2.16 g of 7.beta.-ammonio-3-chloro/bromomethyl-3-cephem-4-carboxylate (57.0% 3-chloromethyl, 20.7% 3-bromomethyl as was found by spectroscopic means). The overall yield was 70%.
IR (KBr-disc, values in cm.sup.-1): about 3420, 1800, 1621, about 1545, 1410, 1348, 1056, 1006, 799, 790.
EXAMPLE XXXIV
Preparation of 3-bromo/chloromethyl-4-carboxy-7.beta.-isopopylideneammonio-3-cephem bromide from 7.beta.-ammonio-3-bromo/chloromethyl-3-cephem-4-carboxylate
6.585 g 7.beta.-ammonio-3-bromo/chloromethyl-3-cephem-4-carboxylate (bromomethyl:chloromethyl=31:69) were dissolved in 50 ml concentrated hydrogen bromide and 20 ml water. This mixture was stirred for five minutes whereafter 100 ml acetone PG,71 was slowly added during half an hour. After stirring for one hour, 650 ml of acetone were added.
After four days standing in the refrigerator the precipitate was filtered and washed with acetone and ether. The yield after drying in vacuo was 8.032 g of 3-bromo/chloro-methyl-4-carboxy-7.beta.-isopropylideneammonio-3-cephem bromide (36% 3-bromomethyl, 64% 3-chloromethyl as was found by spectroscopic means).
EXAMPLE XXXV
Preparation of 3-chloromethyl-4-carboxy-7.beta.-cyclopentylideneammonio-3-cephem chloride from 7.beta.-ammonio-3-bromo/chloromethyl-3-cephem-4-carboxylate
In a centrifuge-tube a small amount of 7.beta.-ammonio-3-bromo/chloromethyl-3-cephem-4-carboxylate was dissolved in a small amount of a solution of concentrated hydrogen chloride. An excess of cyclopentanone was added to the solution.
After standing for a week-end in the refrigerator the product was washed with cyclopentanone and ether, respectively, filtered off and dried in vacuo giving 3-chloromethyl-4-carboxy-7.beta.-cyclopentylideneammonio-3-cephem chloride as confirmed by NMR.
IR (KBr-disc, values in cm.sup.-1): about 3410, 1795, 1706, 1681, 1633, 1506, 1405, 1353, 1098, 1061, 791, 691.
EXAMPLE XXXVI
Preparation of chloro/bromomethyl-4-carboxy-7.beta.-cyclohexylideneammonio-3-cephem chloride from 7.beta.-ammonio-3-chloro/bromomethyl-3-cephem-4-carboxylate
200 mg of 7.beta.-ammonio-3-chloro/bromomethyl-3-cephem-4-carboxylate (prepared in example XXXII) were dissolved in 1 ml of a solution of concentrated hydrogen chloride. Then 0.5 ml of cyclohexanone was added. After a short time a crystalline precipitate was formed. After stirring for 20 minutes cyclohexanone (1 ml) was added again, whereafter there was stirred for another 20 minutes. Then 4 ml of cyclohexanone was added slowly. After stirring for 10 minutes the product was filtered and washed with cyclohexanone and ether, respectively.
After drying in vacuo the yield was 235.2 mg of 3-chloro/bromomethyl-4-carboxy-7.beta.-cyclohexylideneammonio-3-cephem chloride (80% 3-chloromethyl, 20% 3-bromomethyl as was found with NMR).
IR (KBr-disc, values in cm.sup.-1): about 3410, 1800, 1706, 1664, 1630, 1526, 1410, 1351, 1187, 1098, 1061, 706, 692.
EXAMPLE XXXVII
Preparation of chloro/bromomethyl-4-carboxy-7.beta.-cycloheptylideneammonio-3-cephem chloride from 7.beta.-ammonio-3-chloro/bromomethyl-3-cephem-4-carboxylate
In a centrifuge-tube a small amount of 7.beta.-ammonio-3-chloro/bromomethyl-3-cephem-4-carboxylate (prepared in example XXXIII) was dissolved in a small amount of a solution of concentrated hydrogen chloride. To the solution thus obtained an excess of cycloheptanone was added. After about one hour a very fine precipitate was formed. Warming the mixture and cooling down again, the mixture was made somewhat more granulated. The precipitate was centrifugated and washed with cycloheptanone and twice with ether, respectively.
After drying in vacuo crystalline 3-chloro/bromomethyl-4-carboxy-7.beta.-cycloheptylideneammonio-3-cephem chloride (93% 3-chloromethyl, 7% 3-bromomethyl as was found with NMR) was formed.
IR (KBr-disc, values in cm.sup.-1): about 3410, 1798, 1710, 1643, 1522, 1405, 1358, 1098, 1061, 685.
EXAMPLE XXXVIII
Preparation of 3-bromo/chloromethyl-4-carboxy-7.beta.-isobutylideneammonio-3-cephem chloride from 3-bromo/chloromethyl-4-carboxy-7.beta.-isopropylideneammonio-3-cephem chloride
In a centrifuge-tube a small amount of 3-bromo/chloromethyl-4-carboxy-7.beta.-isopropylideneammonio-3-cephem chloride was dissolved in a small amount of concentrated hydrogen chloride. An excess of ethyl methyl ketone was added. No precipitate was formed.
After standing for a week-end in the refrigerator the formed, white precipitate was filtered and washed with ethyl methyl ketone and ether, respectively. After drying crystalline 3-bromo/chloromethyl-4-carboxy-7.beta.-secbutylideneammonio-3-cephem chloride was obtained.
IR (KBr-disc, values in cm.sup.-1): about 3410, 1801, 1708, 1656, 1629, 1516, 1405, 1348, 1232, 1183, 1095, 1062, 1000, 708, 689.
EXAMPLE XXXIX
Preparation of 3-bromo/chloromethyl-4-carboxy-7.beta.-cyclopentylideneammonio-3-cephem chloride from 3-bromo/chloromethyl-4-carboxy-7.beta.-isopropylideneammonio-3-cephem chloride
In a centrifuge-tube a small amount of 3-bromo/chloromethyl-4-carboxy-7.beta.-isopropylideneammonio-3-cephem chloride was dissolved in a small amount of concentrated hydrogen chloride. Cyclopentanone was added to the solution. After standing for three hours the precipitate formed was filtered and washed with a little cyclopentanone and with ether, giving white crystalline 3-bromo/chloromethyl-4-carboxy-7.beta.-cyclopentylideneammonio-3-cephem chloride.
IR (KBr-disc, values in cm.sup.-1): about 3400, 1795, 1701, 1680, 1630, 1501, 1403, 1350, 1094, 1059, 715, 688.
EXAMPLE XXXX
Preparation of 3-bromo/chloromethyl-4-carboxy-7.beta.-cyclohexylideneammonio-3-cephem chloride from 3-bromo/chloromethyl-4-carboxy-7.beta.-isopropylideneammonio-3-cephem chloride
In a centrifuge-tube a small amount of 3-bromo/chloromethyl-4-carboxy-7.beta.-isopropylideneammonio-3-cephem chloride was dissolved in a 1:1 mixture of trifluoroacetic acid and concentrated hydrogen bromide.
Then about 1/4 volume of cyclohexanone was added. The mixture was stirred and crystals were formed slowly. After standing for one hour the crystalline product was filtered and washed with ether.
After drying in vacuo crystalline 3-bromo/chloromethyl-4-carboxy-7.beta.-cyclohexylideneammonio-3-cephem chloride was obtained.
IR (KBr-disc, values in cm.sup.-1): about 3410, 1798, 1710, 1656, 1620, 1512, about 1398, about 1342, 1220, 1180, 1090, 1058, 693, about 620.
EXAMPLE XXXXI
Preparation of 3-bromo/chloromethyl-4-carboxy-7-cyclohexylideneammonio-3-cephem bromide from 3-bromo/chloromethyl-4-carboxy-7.beta.-cyclopentylideneammonio-3-cephem chloride
7.5 g of 3-bromo/chloromethyl-4-carboxy-7.beta.-cyclopentylideneammonio-3-cephem chloride were dissolved in 20 ml acetonitrile. 20 ml of concentrated hydrogen bromide (47%) were added and for some minutes the mixture was heated to about 55.degree. C. After a clear solution has been obtained, the mixture was cooled down to 0.degree. C. Then 10 ml of cyclohexanone was added. The mixture was red-brown and after a few minutes some crystals were formed.
After a night standing in the refrigerator the product was filtered, washed with acetonitrile and dried in vacuo. The yield of the creamy white crystalline 3-bromo/chloromethyl-4-carboxy-7.beta.-cyclohexylideneammonio-3-cephem chloride was 6.68 g (purity 67.6% according to NMR-assay). The product contained also 11.6% 3-chloromethyl and some starting material as was found with NMR.
IR (KBr-disc, values in cm.sup.-1): about 3410, 1799, 1710, 1655, 1620, 1512, about 1398, about 1340, 1220, 1180, 1089, 1057, 696, about 615. PMR-spectrum of the bromomethyl compound (360 MHz, CF.sub.3 COOD, .delta.-values in ppm, int. ref. maleic acid, 25.degree. C.): 1.64 (m, 2H); 1.93 (m, 4H); 2.79 (m, 4H); 4.27, 4.34 (AB-q, J=10.5 Hz, 2H); 5.34 (d, J=4.5 Hz, 1H); 5.88 (d, J=4.5 Hz, 1H). PMR-spectrum (ibidem) of the chloromethyl compound: 1.64 (m, 2H); 1.93 (m, 4H); 2.79 (m, 4H); 4.39, 4.45 (AB-q, J=12.6 Hz, 2H); 5.34 (d, J=4.5 Hz, 1H); 5.91 (d, J=4.5 Hz, 1H).
EXAMPLE XXXXII
Preparation of 3-bromo/chloromethyl-4-carboxy-7.beta.-cycloheptylideneammonio-3-cephem bromide from 3-bromo/chloromethyl-4-carboxy-7.beta.-cyclopentylideneammonio-3-cephem chloride
75 mg of 3-bromo/chloromethyl-4-carboxy-7.beta.-cyclopentylideneammonio-3-cephem chloride was dissolved in 0.2 ml acetonitrile. 0.2 ml of concentrated hydrogen bromide (47%) was added. This mixture was shortly heated till a clear solution was obtained. 0.1 ml of cycloheptanone was added to the yellow solution. Slowly, but faster than in example XXXIV crystals were formed. The solution was a little heated to accelerate the crystallisation.
After standing for a week-end in the refrigerator the product was filtered off and washed with acetonitrile and ether. After drying in a nitrogen-stream the yield was 61.0 mg of a white 3-bromo/chloromethyl-4-carboxy-7.beta.-cycloheptylideneammonio-3-cephem bromide (purity 74.6% according to NMR-assay). The product contained also 11.7% of the 3-chloromethyl compound and and some starting material.
IR (KBr-disc, values in cm.sup.-1): about 3405, 1795, 1710, 1638, about 1628, 1508, about 1395, 1340, 1217, 1088, 1056. PMR-spectrum (360 MHz; CF.sub.3 COOD, .delta.-values in ppm, int. ref. maleic acid, 25.degree. C.) of the bromomethyl compound: 1.56 (m, 4H); 1.81 (m, 4H); 3.02 (m, 4H); 4.27, 4.34 (AB-q, J=10.7 Hz, 2H); 5.35 (d, J=4.5 Hz, 1H); 5.80 (d, J=4.5 Hz, 1H). PMR-spectrum (ibidem) of the chloromethyl compound: 1.56 (m, 4H); 1.81 (m, 4H); 3.02 (m, 4H); 4.39, 4.44 (AB-q, J=12.6 Hz, 2H); 5.35 (d, J=4.5 Hz, 1H); 5.83 (d, J=4.5 Hz, 1H).
EXAMPLE XXXXIII
Preparation of 3-bromo/chloromethyl-4-carboxy-7.beta.-cyclopentylideneammonio-3-cephem bromide from 3-bromo/chloromethyl-4-carboxy-7 .beta.-cyclopentylideneammonio-3-cephem chloride.
75 mg of 3-bromo/chloromethyl-4-carboxy-7.beta.-cyclopentylideneammonio-3-cephem chloride were dissolved in 0.2 ml acetonitrile. 0.2 ml of concentrated hydrogen bromide (47%) was added. This mixture was shortly heated till everything was dissolved. The mixture was heated till clearness and very well stirred. The yellow solution was shaken in an ultra-sonic bath and became then somewhat turbid. Slowly some crystals were formed and 0.2 ml of acetonitrile and 0.2 ml of cyclopentanone were added.
After standing in the refrigerator for a week-end the product was filtered and washed with acetonitrile and ether. After drying in vacuo the yield was 38.9 mg of 3-bromo/chloromethyl-4-carboxy-7.beta.-cyclopentylideneammonio-3-cephem bromide with a purity of 83.3%.
IR (KBr-disc, values in cm.sup.-1): about 3400, 1791, 1705, 1673, 1622, 1491, 1392, 1342, 1217, 1089, 1056, 709, about 620. PMR-spectrum (360 MHz; CF.sub.3 COOD, .delta.-values in ppm, 25.degree. C., int. ref. maleic acid): 1.96 (m, 4H); 2.95 (m, 4H); 4.30 (s, 2H); 5.30 (d, J=4.5 Hz, 1H); 5.70 (d, J=4.5 Hz, 1H).

Number	Date	Country	Kind
87201316.4	Jul 1987	EPX
89200034.0	Jun 1989	EPX

Number	Name	Date
4695627	Verweij et al.	Sep 1987
4921954	Witkamp	May 1990
5164494	Witkamp et al.	Nov 1992

Cephem derivatives

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