US20040087787A1 - Novel thioester derivatives of thiazolyl acetic acid and their use in the preparation of cephalosporin compounds - Google Patents
Novel thioester derivatives of thiazolyl acetic acid and their use in the preparation of cephalosporin compounds Download PDFInfo
- Publication number
- US20040087787A1 US20040087787A1 US10/250,655 US25065503A US2004087787A1 US 20040087787 A1 US20040087787 A1 US 20040087787A1 US 25065503 A US25065503 A US 25065503A US 2004087787 A1 US2004087787 A1 US 2004087787A1
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- United States
- Prior art keywords
- methyl
- formula
- organic solvent
- alkyl
- compound
- Prior art date
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- -1 cephalosporin compounds Chemical class 0.000 title claims abstract description 38
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 title claims abstract description 34
- 150000007970 thio esters Chemical class 0.000 title abstract description 25
- 229930186147 Cephalosporin Natural products 0.000 title abstract description 17
- 229940124587 cephalosporin Drugs 0.000 title abstract description 17
- 238000002360 preparation method Methods 0.000 title abstract description 11
- 125000000335 thiazolyl group Chemical group 0.000 title abstract description 7
- 238000000034 method Methods 0.000 claims abstract description 30
- 238000006243 chemical reaction Methods 0.000 claims abstract description 25
- 150000001875 compounds Chemical class 0.000 claims abstract description 22
- ZMANZCXQSJIPKH-UHFFFAOYSA-N Triethylamine Chemical compound CCN(CC)CC ZMANZCXQSJIPKH-UHFFFAOYSA-N 0.000 claims description 51
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 claims description 39
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 28
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 claims description 25
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 claims description 25
- 239000000203 mixture Substances 0.000 claims description 25
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 23
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 claims description 16
- 239000003960 organic solvent Substances 0.000 claims description 16
- SJRJJKPEHAURKC-UHFFFAOYSA-N N-Methylmorpholine Chemical compound CN1CCOCC1 SJRJJKPEHAURKC-UHFFFAOYSA-N 0.000 claims description 15
- 239000003795 chemical substances by application Substances 0.000 claims description 13
- 229910052739 hydrogen Inorganic materials 0.000 claims description 13
- 239000001257 hydrogen Substances 0.000 claims description 13
- 125000004435 hydrogen atom Chemical group [H]* 0.000 claims description 13
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 claims description 12
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 claims description 12
- 239000002253 acid Substances 0.000 claims description 9
- 150000007530 organic bases Chemical class 0.000 claims description 9
- RYHBNJHYFVUHQT-UHFFFAOYSA-N 1,4-Dioxane Chemical compound C1COCCO1 RYHBNJHYFVUHQT-UHFFFAOYSA-N 0.000 claims description 8
- 238000009833 condensation Methods 0.000 claims description 8
- 230000005494 condensation Effects 0.000 claims description 8
- 125000006701 (C1-C7) alkyl group Chemical group 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 claims description 7
- 125000001181 organosilyl group Chemical group [SiH3]* 0.000 claims description 7
- 229910052701 rubidium Inorganic materials 0.000 claims description 7
- 125000002221 trityl group Chemical group [H]C1=C([H])C([H])=C([H])C([H])=C1C([*])(C1=C(C(=C(C(=C1[H])[H])[H])[H])[H])C1=C([H])C([H])=C([H])C([H])=C1[H] 0.000 claims description 7
- VHYFNPMBLIVWCW-UHFFFAOYSA-N 4-Dimethylaminopyridine Chemical compound CN(C)C1=CC=NC=C1 VHYFNPMBLIVWCW-UHFFFAOYSA-N 0.000 claims description 6
- 230000010933 acylation Effects 0.000 claims description 6
- 238000005917 acylation reaction Methods 0.000 claims description 6
- 125000004178 (C1-C4) alkyl group Chemical group 0.000 claims description 5
- SGUVLZREKBPKCE-UHFFFAOYSA-N 1,5-diazabicyclo[4.3.0]-non-5-ene Chemical compound C1CCN=C2CCCN21 SGUVLZREKBPKCE-UHFFFAOYSA-N 0.000 claims description 5
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 claims description 5
- KLDLRDSRCMJKGM-UHFFFAOYSA-N 3-[chloro-(2-oxo-1,3-oxazolidin-3-yl)phosphoryl]-1,3-oxazolidin-2-one Chemical compound C1COC(=O)N1P(=O)(Cl)N1CCOC1=O KLDLRDSRCMJKGM-UHFFFAOYSA-N 0.000 claims description 4
- FXHOOIRPVKKKFG-UHFFFAOYSA-N N,N-Dimethylacetamide Chemical compound CN(C)C(C)=O FXHOOIRPVKKKFG-UHFFFAOYSA-N 0.000 claims description 4
- JUJWROOIHBZHMG-UHFFFAOYSA-N Pyridine Chemical compound C1=CC=NC=C1 JUJWROOIHBZHMG-UHFFFAOYSA-N 0.000 claims description 4
- 150000003839 salts Chemical class 0.000 claims description 4
- VZGDMQKNWNREIO-UHFFFAOYSA-N tetrachloromethane Chemical compound ClC(Cl)(Cl)Cl VZGDMQKNWNREIO-UHFFFAOYSA-N 0.000 claims description 4
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 claims description 4
- 229910052783 alkali metal Inorganic materials 0.000 claims description 3
- 150000005215 alkyl ethers Chemical class 0.000 claims description 3
- HPNMFZURTQLUMO-UHFFFAOYSA-N diethylamine Chemical compound CCNCC HPNMFZURTQLUMO-UHFFFAOYSA-N 0.000 claims description 3
- 150000008282 halocarbons Chemical class 0.000 claims description 3
- 239000012535 impurity Substances 0.000 claims description 3
- 125000006239 protecting group Chemical group 0.000 claims description 3
- IMFACGCPASFAPR-UHFFFAOYSA-N tributylamine Chemical compound CCCCN(CCCC)CCCC IMFACGCPASFAPR-UHFFFAOYSA-N 0.000 claims description 3
- IMNIMPAHZVJRPE-UHFFFAOYSA-N triethylenediamine Chemical compound C1CN2CCN1CC2 IMNIMPAHZVJRPE-UHFFFAOYSA-N 0.000 claims description 3
- JABYJIQOLGWMQW-UHFFFAOYSA-N undec-4-ene Chemical compound CCCCCCC=CCCC JABYJIQOLGWMQW-UHFFFAOYSA-N 0.000 claims description 3
- HZONRRHNQILCNO-UHFFFAOYSA-N 1-methyl-2h-pyridine Chemical class CN1CC=CC=C1 HZONRRHNQILCNO-UHFFFAOYSA-N 0.000 claims description 2
- AFBPFSWMIHJQDM-UHFFFAOYSA-N N-methylaniline Chemical class CNC1=CC=CC=C1 AFBPFSWMIHJQDM-UHFFFAOYSA-N 0.000 claims description 2
- 239000012043 crude product Substances 0.000 claims description 2
- 238000001556 precipitation Methods 0.000 claims description 2
- 238000000746 purification Methods 0.000 claims description 2
- UMJSCPRVCHMLSP-UHFFFAOYSA-N pyridine Natural products COC1=CC=CN=C1 UMJSCPRVCHMLSP-UHFFFAOYSA-N 0.000 claims description 2
- LMBFAGIMSUYTBN-MPZNNTNKSA-N teixobactin Chemical compound C([C@H](C(=O)N[C@@H]([C@@H](C)CC)C(=O)N[C@@H](CO)C(=O)N[C@H](CCC(N)=O)C(=O)N[C@H]([C@@H](C)CC)C(=O)N[C@@H]([C@@H](C)CC)C(=O)N[C@@H](CO)C(=O)N[C@H]1C(N[C@@H](C)C(=O)N[C@@H](C[C@@H]2NC(=N)NC2)C(=O)N[C@H](C(=O)O[C@H]1C)[C@@H](C)CC)=O)NC)C1=CC=CC=C1 LMBFAGIMSUYTBN-MPZNNTNKSA-N 0.000 claims description 2
- 239000002585 base Substances 0.000 claims 1
- 125000001271 cephalosporin group Chemical group 0.000 claims 1
- 150000001780 cephalosporins Chemical class 0.000 abstract description 19
- 230000003115 biocidal effect Effects 0.000 abstract description 3
- 238000004128 high performance liquid chromatography Methods 0.000 description 15
- 239000003242 anti bacterial agent Substances 0.000 description 14
- 229940088710 antibiotic agent Drugs 0.000 description 14
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 12
- YXIWHUQXZSMYRE-UHFFFAOYSA-N 1,3-benzothiazole-2-thiol Chemical compound C1=CC=C2SC(S)=NC2=C1 YXIWHUQXZSMYRE-UHFFFAOYSA-N 0.000 description 10
- 0 [2*]C1=NN=C(SC(=O)/C(=N\C)C2=CSC(N)=N2)O1 Chemical compound [2*]C1=NN=C(SC(=O)/C(=N\C)C2=CSC(N)=N2)O1 0.000 description 10
- QTBSBXVTEAMEQO-UHFFFAOYSA-M Acetate Chemical compound CC([O-])=O QTBSBXVTEAMEQO-UHFFFAOYSA-M 0.000 description 9
- 239000007787 solid Substances 0.000 description 9
- 125000000738 acetamido group Chemical group [H]C([H])([H])C(=O)N([H])[*] 0.000 description 7
- 230000015572 biosynthetic process Effects 0.000 description 7
- 150000001782 cephems Chemical group 0.000 description 7
- 239000010410 layer Substances 0.000 description 7
- 238000003786 synthesis reaction Methods 0.000 description 7
- WEVYAHXRMPXWCK-UHFFFAOYSA-N Acetonitrile Chemical compound CC#N WEVYAHXRMPXWCK-UHFFFAOYSA-N 0.000 description 6
- IAZDPXIOMUYVGZ-WFGJKAKNSA-N Dimethyl sulfoxide Chemical compound [2H]C([2H])([2H])S(=O)C([2H])([2H])[2H] IAZDPXIOMUYVGZ-WFGJKAKNSA-N 0.000 description 6
- 239000006227 byproduct Substances 0.000 description 6
- 239000011541 reaction mixture Substances 0.000 description 6
- 239000002904 solvent Substances 0.000 description 5
- 231100000331 toxic Toxicity 0.000 description 5
- 230000002588 toxic effect Effects 0.000 description 5
- HSHGZXNAXBPPDL-HZGVNTEJSA-N 7beta-aminocephalosporanic acid Chemical compound S1CC(COC(=O)C)=C(C([O-])=O)N2C(=O)[C@@H]([NH3+])[C@@H]12 HSHGZXNAXBPPDL-HZGVNTEJSA-N 0.000 description 4
- ZAFNJMIOTHYJRJ-UHFFFAOYSA-N Diisopropyl ether Chemical compound CC(C)OC(C)C ZAFNJMIOTHYJRJ-UHFFFAOYSA-N 0.000 description 4
- GPRBEKHLDVQUJE-VINNURBNSA-N cefotaxime Chemical compound N([C@@H]1C(N2C(=C(COC(C)=O)CS[C@@H]21)C(O)=O)=O)C(=O)/C(=N/OC)C1=CSC(N)=N1 GPRBEKHLDVQUJE-VINNURBNSA-N 0.000 description 4
- 229960000479 ceftriaxone sodium Drugs 0.000 description 4
- 239000003610 charcoal Substances 0.000 description 4
- FDRNWTJTHBSPMW-GNXCPKRQSA-L disodium;(6r,7r)-7-[[(2e)-2-(2-amino-1,3-thiazol-4-yl)-2-methoxyiminoacetyl]amino]-3-[(2-methyl-6-oxido-5-oxo-1,2,4-triazin-3-yl)sulfanylmethyl]-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylate Chemical compound [Na+].[Na+].S([C@@H]1[C@@H](C(N1C=1C([O-])=O)=O)NC(=O)/C(=N/OC)C=2N=C(N)SC=2)CC=1CSC1=NC(=O)C([O-])=NN1C FDRNWTJTHBSPMW-GNXCPKRQSA-L 0.000 description 4
- 150000002148 esters Chemical class 0.000 description 4
- 229940093499 ethyl acetate Drugs 0.000 description 4
- 235000019439 ethyl acetate Nutrition 0.000 description 4
- FFUAGWLWBBFQJT-UHFFFAOYSA-N hexamethyldisilazane Chemical compound C[Si](C)(C)N[Si](C)(C)C FFUAGWLWBBFQJT-UHFFFAOYSA-N 0.000 description 4
- FYSNRJHAOHDILO-UHFFFAOYSA-N thionyl chloride Chemical compound ClS(Cl)=O FYSNRJHAOHDILO-UHFFFAOYSA-N 0.000 description 4
- RIOQSEWOXXDEQQ-UHFFFAOYSA-N triphenylphosphine Chemical compound C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1 RIOQSEWOXXDEQQ-UHFFFAOYSA-N 0.000 description 4
- 238000001644 13C nuclear magnetic resonance spectroscopy Methods 0.000 description 3
- 238000005160 1H NMR spectroscopy Methods 0.000 description 3
- FOHWXVBZGSVUGO-UHFFFAOYSA-N 5-phenyl-3h-1,3,4-oxadiazole-2-thione Chemical compound O1C(S)=NN=C1C1=CC=CC=C1 FOHWXVBZGSVUGO-UHFFFAOYSA-N 0.000 description 3
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- FZWLAAWBMGSTSO-UHFFFAOYSA-N Thiazole Chemical group C1=CSC=N1 FZWLAAWBMGSTSO-UHFFFAOYSA-N 0.000 description 3
- 230000004913 activation Effects 0.000 description 3
- IJOOHPMOJXWVHK-UHFFFAOYSA-N chlorotrimethylsilane Chemical compound C[Si](C)(C)Cl IJOOHPMOJXWVHK-UHFFFAOYSA-N 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- NLARCUDOUOQRPB-WTKPLQERSA-N (2z)-2-(2-amino-1,3-thiazol-4-yl)-2-methoxyiminoacetic acid Chemical compound CO\N=C(/C(O)=O)C1=CSC(N)=N1 NLARCUDOUOQRPB-WTKPLQERSA-N 0.000 description 2
- YTUNICCSPPTMJY-URYLQHRCSA-N (6r)-7-amino-3-[(2-methyl-5,6-dioxo-1h-1,2,4-triazin-3-yl)sulfanylmethyl]-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid Chemical compound CN1NC(=O)C(=O)N=C1SCC1=C(C(O)=O)N2C(=O)C(N)[C@H]2SC1 YTUNICCSPPTMJY-URYLQHRCSA-N 0.000 description 2
- ZNVOUDVNEIRTGV-BBZZFXJRSA-N (6r)-7-amino-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-4-carboxylic acid Chemical class S1C(C(O)=O)C=CN2C(=O)C(N)[C@H]21 ZNVOUDVNEIRTGV-BBZZFXJRSA-N 0.000 description 2
- MIHIJWOEDDPOLG-UHFFFAOYSA-N 2-methoxyiminoacetic acid Chemical compound CON=CC(O)=O MIHIJWOEDDPOLG-UHFFFAOYSA-N 0.000 description 2
- SMJRBWINMFUUDS-UHFFFAOYSA-N 2-thienylacetic acid Chemical compound OC(=O)CC1=CC=CS1 SMJRBWINMFUUDS-UHFFFAOYSA-N 0.000 description 2
- VQBXUKGMJCPBMF-UHFFFAOYSA-N 5-methyl-1,2-oxazole-4-carboxylic acid Chemical compound CC=1ON=CC=1C(O)=O VQBXUKGMJCPBMF-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- AOQVJKYIWRIMOD-YWEYNIOJSA-N C/N=C(\C(=O)O)C1=CSC(N)=N1 Chemical compound C/N=C(\C(=O)O)C1=CSC(N)=N1 AOQVJKYIWRIMOD-YWEYNIOJSA-N 0.000 description 2
- QNAYBMKLOCPYGJ-UHFFFAOYSA-N D-alpha-Ala Natural products CC([NH3+])C([O-])=O QNAYBMKLOCPYGJ-UHFFFAOYSA-N 0.000 description 2
- QOSSAOTZNIDXMA-UHFFFAOYSA-N Dicylcohexylcarbodiimide Chemical compound C1CCCCC1N=C=NC1CCCCC1 QOSSAOTZNIDXMA-UHFFFAOYSA-N 0.000 description 2
- QXNVGIXVLWOKEQ-UHFFFAOYSA-N Disodium Chemical compound [Na][Na] QXNVGIXVLWOKEQ-UHFFFAOYSA-N 0.000 description 2
- 229910006024 SO2Cl2 Inorganic materials 0.000 description 2
- 229910006124 SOCl2 Inorganic materials 0.000 description 2
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 2
- 125000003277 amino group Chemical group 0.000 description 2
- 239000012298 atmosphere Substances 0.000 description 2
- 150000001732 carboxylic acid derivatives Chemical class 0.000 description 2
- MQLRYUCJDNBWMV-GHXIOONMSA-N cefetamet Chemical compound N([C@@H]1C(N2C(=C(C)CS[C@@H]21)C(O)=O)=O)C(=O)\C(=N/OC)C1=CSC(N)=N1 MQLRYUCJDNBWMV-GHXIOONMSA-N 0.000 description 2
- 229960004041 cefetamet Drugs 0.000 description 2
- OKBVVJOGVLARMR-QSWIMTSFSA-N cefixime Chemical compound S1C(N)=NC(C(=N\OCC(O)=O)\C(=O)N[C@@H]2C(N3C(=C(C=C)CS[C@@H]32)C(O)=O)=O)=C1 OKBVVJOGVLARMR-QSWIMTSFSA-N 0.000 description 2
- 229960002129 cefixime Drugs 0.000 description 2
- LTINZAODLRIQIX-FBXRGJNPSA-N cefpodoxime proxetil Chemical compound N([C@H]1[C@@H]2N(C1=O)C(=C(CS2)COC)C(=O)OC(C)OC(=O)OC(C)C)C(=O)C(=N/OC)\C1=CSC(N)=N1 LTINZAODLRIQIX-FBXRGJNPSA-N 0.000 description 2
- 229960004797 cefpodoxime proxetil Drugs 0.000 description 2
- ZBHXIWJRIFEVQY-IHMPYVIRSA-N ceftiofur Chemical compound S([C@@H]1[C@@H](C(N1C=1C(O)=O)=O)NC(=O)\C(=N/OC)C=2N=C(N)SC=2)CC=1CSC(=O)C1=CC=CO1 ZBHXIWJRIFEVQY-IHMPYVIRSA-N 0.000 description 2
- 229960005229 ceftiofur Drugs 0.000 description 2
- 238000010511 deprotection reaction Methods 0.000 description 2
- 239000000706 filtrate Substances 0.000 description 2
- 125000000956 methoxy group Chemical group [H]C([H])([H])O* 0.000 description 2
- 125000001160 methoxycarbonyl group Chemical group [H]C([H])([H])OC(*)=O 0.000 description 2
- 125000004184 methoxymethyl group Chemical group [H]C([H])([H])OC([H])([H])* 0.000 description 2
- 239000012044 organic layer Substances 0.000 description 2
- RLOWWWKZYUNIDI-UHFFFAOYSA-N phosphinic chloride Chemical compound ClP=O RLOWWWKZYUNIDI-UHFFFAOYSA-N 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 125000005344 pyridylmethyl group Chemical group [H]C1=C([H])C([H])=C([H])C(=N1)C([H])([H])* 0.000 description 2
- VYPDUQYOLCLEGS-UHFFFAOYSA-M sodium;2-ethylhexanoate Chemical compound [Na+].CCCCC(CC)C([O-])=O VYPDUQYOLCLEGS-UHFFFAOYSA-M 0.000 description 2
- 125000000446 sulfanediyl group Chemical group *S* 0.000 description 2
- YBBRCQOCSYXUOC-UHFFFAOYSA-N sulfuryl dichloride Chemical compound ClS(Cl)(=O)=O YBBRCQOCSYXUOC-UHFFFAOYSA-N 0.000 description 2
- 229920002554 vinyl polymer Polymers 0.000 description 2
- LYFVEJJFORTCPS-YVLHZVERSA-N (2Z)-2-(2-amino-1,3-thiazol-4-yl)-2-[(2-sulfanylidene-3H-1,3-benzothiazol-4-yl)methoxyimino]acetic acid Chemical compound S1C(N)=NC(C(=N\OCC=2C=3NC(=S)SC=3C=CC=2)\C(O)=O)=C1 LYFVEJJFORTCPS-YVLHZVERSA-N 0.000 description 1
- AGFYEFQBXHONNW-WDZFZDKYSA-N (2z)-2-(2-amino-1,3-thiazol-4-yl)-2-(2-methoxy-2-oxoethoxy)iminoacetic acid Chemical compound COC(=O)CO\N=C(/C(O)=O)C1=CSC(N)=N1 AGFYEFQBXHONNW-WDZFZDKYSA-N 0.000 description 1
- GQLGFBRMCCVQLU-XCGJVMPOSA-N (6r)-7-amino-3-ethenyl-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid Chemical compound S1CC(C=C)=C(C(O)=O)N2C(=O)C(N)[C@H]21 GQLGFBRMCCVQLU-XCGJVMPOSA-N 0.000 description 1
- MMRINLZOZVAPDZ-LSGRDSQZSA-N (6r,7r)-7-[[(2z)-2-(2-amino-1,3-thiazol-4-yl)-2-methoxyiminoacetyl]amino]-3-[(1-methylpyrrolidin-1-ium-1-yl)methyl]-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid;chloride Chemical compound Cl.S([C@@H]1[C@@H](C(N1C=1C([O-])=O)=O)NC(=O)\C(=N/OC)C=2N=C(N)SC=2)CC=1C[N+]1(C)CCCC1 MMRINLZOZVAPDZ-LSGRDSQZSA-N 0.000 description 1
- RJFPBECTFIUTHB-INEUFUBQSA-N (6r,7r)-7-azaniumyl-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylate Chemical compound S1CC=C(C(O)=O)N2C(=O)[C@@H](N)[C@H]21 RJFPBECTFIUTHB-INEUFUBQSA-N 0.000 description 1
- BDSDFCVDQUGOFB-XNCJUZBTSA-N (6s,7s)-7-amino-3-(methoxymethyl)-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid Chemical compound S1CC(COC)=C(C(O)=O)N2C(=O)[C@H](N)[C@H]12 BDSDFCVDQUGOFB-XNCJUZBTSA-N 0.000 description 1
- ODIGIKRIUKFKHP-UHFFFAOYSA-N (n-propan-2-yloxycarbonylanilino) acetate Chemical compound CC(C)OC(=O)N(OC(C)=O)C1=CC=CC=C1 ODIGIKRIUKFKHP-UHFFFAOYSA-N 0.000 description 1
- 125000004504 1,2,4-oxadiazolyl group Chemical group 0.000 description 1
- 125000004514 1,2,4-thiadiazolyl group Chemical group 0.000 description 1
- 125000001781 1,3,4-oxadiazolyl group Chemical group 0.000 description 1
- 125000004520 1,3,4-thiadiazolyl group Chemical group 0.000 description 1
- ASOKPJOREAFHNY-UHFFFAOYSA-N 1-Hydroxybenzotriazole Chemical compound C1=CC=C2N(O)N=NC2=C1 ASOKPJOREAFHNY-UHFFFAOYSA-N 0.000 description 1
- 229940069744 2,2'-dithiobisbenzothiazole Drugs 0.000 description 1
- NGNBDVOYPDDBFK-UHFFFAOYSA-N 2-[2,4-di(pentan-2-yl)phenoxy]acetyl chloride Chemical compound CCCC(C)C1=CC=C(OCC(Cl)=O)C(C(C)CCC)=C1 NGNBDVOYPDDBFK-UHFFFAOYSA-N 0.000 description 1
- UMWWHOXOVPIGFD-UHFFFAOYSA-N 2-methyl-3-sulfanylidene-1,2,4-triazinane-5,6-dione Chemical compound CN1NC(=O)C(=O)N=C1S UMWWHOXOVPIGFD-UHFFFAOYSA-N 0.000 description 1
- QCQCHGYLTSGIGX-GHXANHINSA-N 4-[[(3ar,5ar,5br,7ar,9s,11ar,11br,13as)-5a,5b,8,8,11a-pentamethyl-3a-[(5-methylpyridine-3-carbonyl)amino]-2-oxo-1-propan-2-yl-4,5,6,7,7a,9,10,11,11b,12,13,13a-dodecahydro-3h-cyclopenta[a]chrysen-9-yl]oxy]-2,2-dimethyl-4-oxobutanoic acid Chemical compound N([C@@]12CC[C@@]3(C)[C@]4(C)CC[C@H]5C(C)(C)[C@@H](OC(=O)CC(C)(C)C(O)=O)CC[C@]5(C)[C@H]4CC[C@@H]3C1=C(C(C2)=O)C(C)C)C(=O)C1=CN=CC(C)=C1 QCQCHGYLTSGIGX-GHXANHINSA-N 0.000 description 1
- NFWPZNNZUCPLAX-UHFFFAOYSA-N 4-methoxy-3-methylaniline Chemical compound COC1=CC=C(N)C=C1C NFWPZNNZUCPLAX-UHFFFAOYSA-N 0.000 description 1
- 125000002373 5 membered heterocyclic group Chemical group 0.000 description 1
- ZVGKPQCCKGLQPB-UHFFFAOYSA-N 5-methyl-3h-1,3,4-oxadiazole-2-thione Chemical compound CC1=NN=C(S)O1 ZVGKPQCCKGLQPB-UHFFFAOYSA-N 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-M Bicarbonate Chemical compound OC([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-M 0.000 description 1
- 244000110556 Cyclopia subternata Species 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- QNAYBMKLOCPYGJ-UWTATZPHSA-N L-Alanine Natural products C[C@@H](N)C(O)=O QNAYBMKLOCPYGJ-UWTATZPHSA-N 0.000 description 1
- QNAYBMKLOCPYGJ-REOHCLBHSA-N L-alanine Chemical compound C[C@H](N)C(O)=O QNAYBMKLOCPYGJ-REOHCLBHSA-N 0.000 description 1
- ODGIMMLDVSWADK-UHFFFAOYSA-N Nc1ccc(C(F)(F)F)cc1 Chemical compound Nc1ccc(C(F)(F)F)cc1 ODGIMMLDVSWADK-UHFFFAOYSA-N 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- 125000000066 S-methyl group Chemical group [H]C([H])([H])S* 0.000 description 1
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical class [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 1
- ONIBWKKTOPOVIA-SCSAIBSYSA-N [H][C@]1(C(=O)O)CCCN1 Chemical compound [H][C@]1(C(=O)O)CCCN1 ONIBWKKTOPOVIA-SCSAIBSYSA-N 0.000 description 1
- 229960003767 alanine Drugs 0.000 description 1
- 238000010640 amide synthesis reaction Methods 0.000 description 1
- 150000001408 amides Chemical class 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 150000008064 anhydrides Chemical class 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 150000001735 carboxylic acids Chemical class 0.000 description 1
- 229960002100 cefepime Drugs 0.000 description 1
- 229960004261 cefotaxime Drugs 0.000 description 1
- YGBFLZPYDUKSPT-MRVPVSSYSA-N cephalosporanic acid Chemical compound S1CC(COC(=O)C)=C(C(O)=O)N2C(=O)C[C@H]21 YGBFLZPYDUKSPT-MRVPVSSYSA-N 0.000 description 1
- 150000001805 chlorine compounds Chemical class 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- AFZSMODLJJCVPP-UHFFFAOYSA-N dibenzothiazol-2-yl disulfide Chemical compound C1=CC=C2SC(SSC=3SC4=CC=CC=C4N=3)=NC2=C1 AFZSMODLJJCVPP-UHFFFAOYSA-N 0.000 description 1
- 229940113088 dimethylacetamide Drugs 0.000 description 1
- 125000005982 diphenylmethyl group Chemical group [H]C1=C([H])C([H])=C(C([H])=C1[H])C([H])(*)C1=C([H])C([H])=C([H])C([H])=C1[H] 0.000 description 1
- 230000008034 disappearance Effects 0.000 description 1
- 239000012153 distilled water Substances 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- 125000005842 heteroatom Chemical group 0.000 description 1
- 125000000623 heterocyclic group Chemical group 0.000 description 1
- NPZTUJOABDZTLV-UHFFFAOYSA-N hydroxybenzotriazole Substances O=C1C=CC=C2NNN=C12 NPZTUJOABDZTLV-UHFFFAOYSA-N 0.000 description 1
- 229910003002 lithium salt Inorganic materials 0.000 description 1
- 159000000002 lithium salts Chemical class 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000012299 nitrogen atmosphere Substances 0.000 description 1
- 230000000269 nucleophilic effect Effects 0.000 description 1
- 125000005646 oximino group Chemical group 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 125000006503 p-nitrobenzyl group Chemical group [H]C1=C([H])C(=C([H])C([H])=C1[N+]([O-])=O)C([H])([H])* 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 125000004368 propenyl group Chemical group C(=CC)* 0.000 description 1
- 125000004076 pyridyl group Chemical group 0.000 description 1
- 125000000714 pyrimidinyl group Chemical group 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052938 sodium sulfate Inorganic materials 0.000 description 1
- 235000011152 sodium sulphate Nutrition 0.000 description 1
- YOBPSXOHCHDCMU-IXIFSOOLSA-M sodium;(6r,7r)-7-[[(2e)-2-(2-amino-1,3-thiazol-4-yl)-2-methoxyiminoacetyl]amino]-3-[(2-methyl-5,6-dioxo-1h-1,2,4-triazin-3-yl)sulfanylmethyl]-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylate Chemical compound [Na+].S([C@@H]1[C@@H](C(N1C=1C([O-])=O)=O)NC(=O)/C(=N/OC)C=2N=C(N)SC=2)CC=1CSC1=NC(=O)C(O)=NN1C YOBPSXOHCHDCMU-IXIFSOOLSA-M 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 125000001424 substituent group Chemical group 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 239000001117 sulphuric acid Substances 0.000 description 1
- 235000011149 sulphuric acid Nutrition 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 150000003573 thiols Chemical class 0.000 description 1
- 231100000167 toxic agent Toxicity 0.000 description 1
- 239000003440 toxic substance Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D417/00—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and sulfur atoms as the only ring hetero atoms, not provided for by group C07D415/00
- C07D417/02—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and sulfur atoms as the only ring hetero atoms, not provided for by group C07D415/00 containing two hetero rings
- C07D417/12—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and sulfur atoms as the only ring hetero atoms, not provided for by group C07D415/00 containing two hetero rings linked by a chain containing hetero atoms as chain links
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D501/00—Heterocyclic compounds containing 5-thia-1-azabicyclo [4.2.0] octane ring systems, i.e. compounds containing a ring system of the formula:, e.g. cephalosporins; Such ring systems being further condensed, e.g. 2,3-condensed with an oxygen-, nitrogen- or sulfur-containing hetero ring
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/50—Improvements relating to the production of bulk chemicals
- Y02P20/55—Design of synthesis routes, e.g. reducing the use of auxiliary or protecting groups
Definitions
- the present invention relates to novel thioester derivatives of thiazolyl acetic acid of the general formula (I).
- the invention also relates to a novel process for preparation of the thioester derivatives.
- the reactive thioester derivatives are useful as intermediate for the preparation of cephalosporin antibiotics having the formula (II).
- the present invention also relates to a process for preparation of cephalosporin antibiotics using the said thioester derivatives.
- R 1 represents H, trityl, CH 3 , CR a R b COOR 3 (R a and R b independently of one another represents hydrogen or methyl and R 3 represents H or C 1 -C 7 alkyl).
- R 2 represents C 1 -C 4 alkyl or phenyl
- Acid chlorides, anhydrides, esters, amide etc. are reported in the chemical literature for activation of carboxylic acid of formula (IV). Activation in the form of acid chloride required protection and deprotection of NH 2 group.
- U.S. Pat. No. 4,767,852 discloses a process for production of cephems by acylating 7-amino-3-cephem-4-carboxylic acid with 2-mercaptobenzothiazolyl-(Z)-2-(2-aminothiazol-4-yl)-2-methoxyiminoacetate (MAEM).
- MAEM 2-mercaptobenzothiazolyl-(Z)-2-(2-aminothiazol-4-yl)-2-methoxyiminoacetate
- MAEM 2-mercaptobenzothiazolyl-(Z)-2-(2-aminothiazol-4-yl)-2-methoxyiminoacetate
- MAEM 2-mercaptobenzothiazolyl-(Z)-2-(2-aminothiazol-4-yl)-2-methoxyiminoacetate
- MAEM 2-mercaptobenzothiazolyl-(Z)-2-(2-aminothiazol-4-yl)
- the primary objective of the invention is to prepare novel thioester derivatives of thiazolyl acetic acid of the general formula (I), which would be better than the existing reactive derivatives and suitable for being used in the manufacture of cephalosporin antibiotics.
- Another objective of the present invention is to provide a process for the synthesis of thioester derivatives of formula (I) from thiazolyl acetic acid of the general formula (IV) and thio-oxadiazoles of the general formula (VI).
- Yet another objective of the present invention is to provide a simple, high yielding and cost-effective process for the preparation of cephalosporin antibiotics of the general formula (II).
- Still another objective of the present invention is to produce cephalosporin antibiotics that are highly pure and free from toxic byproducts.
- One more objective of the present invention is to provide a process for the preparation of cephalosporin antibiotics of the general formula (II) from the said novel thioester derivatives.
- the present invention provides novel thioester derivatives of thiazolyl acetic acid of the general formula (I).
- the invention also provides a method by which the said thioester derivatives can be prepared.
- the thioester derivatives so obtained are reacted with 7-amino-cephem carboxylic acids of the general formula (III) to produce cephalosporin antibiotic compounds having the general formula (II).
- the present invention provides new thioesters of the general formula (I) that are prepared by a novel method which has not been reported in the prior art.
- the use of these compounds in the process for preparing cephem derivatives renders the process entirely new and different from others.
- the novel derivative of thiazolyl acetic acid is represented by the formula (I)
- R 1 represents H, trityl, CH 3 , CR a R b COOR 3 (R a and R b independently of one another represents hydrogen or methyl and R 3 represents H or C 1 -C 7 alkyl).
- R 2 represents C 1 -C 4 alkyl or phenyl
- R 1 represents H, trityl, CH 3 , CR a R b COOR 3 (R a and R b independently of one another represents hydrogen or methyl and R 3 represents H or C 1 -C 7 alkyl).
- R 2 represents C 1 -C 4 alkyl or phenyl
- R 4 is CH 3 , —CH ⁇ CH 2 , CH 2 OCH 3 , CH 2 OCOCH 3 ,
- R 5 is hydrogen, salt or carboxylic protecting group.
- R 6 is hydrogen or silyl.
- the organic solvent is selected from the group comprising dichloromethane, tetrahydrofuran, dioxane, N,N-dimethylformamide, acetone, carbon tetrachloride and mixtures thereof.
- the condensation agent is bis-(2-oxo-oxazolidinyl) phosphinic chloride.
- the organic base is selected from triethylamine, diethylamine, tributylamine, pyridine, N-alkylanilines, 1,8-diazabicyclo[5.4.2]undec-7-ene, 1,5-diazabicyclo[4.3.0]non-5-ene, N-methylmorpholine and mixtures thereof.
- carboxylic group as ester, following group can be used which are easily converted into free carboxylic acid, e.g. p-methoxybenzyl, p-nitrobenzyl, diphenyl methyl, phenacyl trimethylsilyl.
- R 1 , R 2 R 4 , R 5 , & R 6 are as defined above.
- the present invention provides a method by which cephalosporin antibiotics are obtained in high purity (95-99%) and excellent yield (79-95%) without the necessity for protecting the amino group of the acylating agents and the production of toxic byproduct namely 2-mercaptobenzothiazole is avoided.
- R 4 in cephem compound (III) represents methyl, acetyloxymethyl, methoxymethyl, vinyl, pyridylmethyl, propenyl, 2,5-dihydro-6-hydroxy-2-methyl-5-oxo-1,2,4-triazine-3-thiol, furanyl-2-carbonyl thiol or a standard cephalosporin substituents defined by R 4 .
- R 4 represents —CH 2 —X wherein X is a residue of any organic or inorganic nucleophilic compound, e.g., halogen, hydroxy, cyano, mercapto, azido, amino, etc.
- X may preferably represent residue of any 5 or 6 membered heterocyclic thiol.
- the heterocyclic thiol contains one to four hetero atoms selected from a group of nitrogen, oxygen and/or sulfur. Some of the examples of five membered ring are 1,2,4-thiadiazolyl, 1,3,4-thiadiazolyl, 1H-tetrazolyl, 1,2,4-tetrazolyl, 1,2,3-tetrazolyl, 1,3,4-oxadiazolyl, 1,2,4-oxadiazolyl, etc.
- the six membered heterocyclic ring can be exemplified by pyridyl, pyrimidyl, pyridinyl-N-oxide, etc.
- R 5 represents hydrogen, salt or a standard carboxylic protecting group.
- R 6 is hydrogen or silyl.
- cephem compound (III) with thioester (I) is performed by two different methodologies (a) by acylating the compound (III) (when R 6 is H) with compound (I) in aqueous organic solvent; (b) by acylating compound (III) (when R 6 is silyl) with compound (I) in aprotic organic solvents. Both the approaches are comparable and afforded excellent yields and purities of cephem antibiotics (II).
- acylation of compound of formula (III) (when R 6 is silyl) is carried out in aprotic organic solvents like halogenated hydrocarbons, toluene, alkyl ethers etc., but the preferred solvent is dichloromethane.
- Suitable silylating agents used for the reaction are hexamethyldisalazane, bis(trimethyl)silylacetamide and trimethylsilyl chloride.
- the organic base may be selected from triethylamine, diethylamine, tributylamine, N-alkylpyridine, N-alkylanilines, 1,8-diazabicyclo[5.4.2]undec-7-ene, 1,5-diazabicyclo[4.3.0]non-5-ene, N-methylmorpholine, 1,4-diazabicyclo[2.2.2]octane, 4-dimethylamino pyridine and mixtures thereof.
- R 4 represents any of methyl, vinyl, methoxymethyl, pyridylmethyl, acetyloxymethyl, (2,5-dihydro-6-hydroxy-2-methyl-5-oxo-1,2,4-triazin-3-yl)thiomethyl, furylcarbonyl thiomethyl or a standard cephalosporin substituent.
- R 1 represents H, trityl, CH 3 , CR a R b COOR 3 (R a and R b independently of one another represents hydrogen or methyl and R 3 represents H or C 1 -C 7 alkyl).
- R 5 is hydrogen or alkali metal salt.
- the alkali metal salts are selected from sodium, potassium and lithium salts.
- the compound of formula II is a syn isomer.
- R 6 is silyl
- the acylation is achieved by doing the reaction in aprotic organic solvent like halogenated hydrocarbon, toluene, alkyl ether preferably in dichloromethane.
- R 2 is methyl and R 4 represents any of (2,5-dihydro-6-hydroxy-2-methyl-5-oxo-1,2,4-triazin-3-yl)thiomethyl, and purification of this compound is achieved by dissolving the crude product in mixture of water and water miscible organic solvent selected from acetone, IPA, dioxane and mixture thereof.
- the organic base is selected from the group consisting of triethylamine, N-methylmorpholine, N-methylpyridines, N-methylanilines, 1,5-diazabicyclo[4.3.0] non-5-ene, 1,4-diazabicyclo[2.2.2]octane, 4-dimethylaminopyridine, and mixtures thereof.
- R 2 is methyl
- R 4 is (2,5-dihydro-6-hydroxy-2-methyl-5-oxo-1,2,4-triazin-3-yl)thiomethyl
- the colour impurities are separated at ⁇ 10° C. to 0° C. and precipitation by water miscible organic solvent selected from acetone, IPA, dioxane and mixture thereof
- the present invention provides novel thioester derivatives of thiazolyl acetic acid of the general formula (I), also, the invention provides a method by which the said thioester derivatives can be prepared by reacting thiazolyl acetic acid of the general formula (IV) with 2-mercapto-5-substituted-1,3,4-oxadiazole of the general formula (VI) (preparation of VI, J. Am. Chem. Soc., 1955, 77, 400) in a solvent, in presence of an organic base and with the help of condensation agent bis-(2-oxo-oxazolidinyl) phosphinic chloride of the formula (V) (preparation of V, Synthesis, 1980, 547).
- cephalosporin antibiotic compounds having the general formula (II).
- the cephalosporin antibiotics so obtained are of high purity (95-99%).
- the method gives an excellent yield (79-95%) of cephalosporin without necessitating for the protection of the amino group of the acylating agents, and the toxic byproduct 2-mercaptobenzothiazole is not produced.
- Triethylamine (11.9 ml) was added in 2-3 hours at 5° C. maintaining the pH 7.5-8.5. The reaction progress was monitored by HPLC. After the reaction was complete, the mixture was extracted with dichloromethane (3 ⁇ 100 ml). The aq. layer was separated and treated with charcoal (0.2 g). A solution of sodium-2-ethylhexanoate (30.5 g) in acetone was added to filtrate at 10-15° C. and stirred for 1.5 hours (400 ml) of acetone was added in 1 hour at 10-15° C. to complete the crystallization. The product was filtered under N 2 atmosphere and wet cake was dissolved in mixture of water and acetone (1:2), and cooled to ⁇ 10° C.
- the aqueous layer is subjected for charcoal (0.125 g) treatment.
- Ethylacetate was added to the filtrate and the solution was acidified with dil. HCl at 10° C. to pH 3.0.
- the solid separated was filtered, washed with water and ethylacetate and then dried under vacuum at 40-45° C. to get Cefotaxime, 40.9 g (yield 98%).
- the aqueous layer was diluted with 15 ml THF and pH was lowered to 3 by addition of 1N HCl. The solution is saturated by salt. The organic layer was separated and pH was further adjusted to 0.5 by concentrated HCI. IPE (250 ml) was added to precipitate the hydrochloride salt of Ceftiofur, 4.43 g (yield 79.0%).
Abstract
The present invention provides novel thioester derivatives of thiazolyl acetic acid of the general formula (I), also, the invention provides a method for preparation of the thioester derivatives and reaction of the thioester derivatives with cephem carboxylic acids to produce cephalosporin antibiotic compounds having general formula (II).
Description
- The present invention relates to novel thioester derivatives of thiazolyl acetic acid of the general formula (I). The invention also relates to a novel process for preparation of the thioester derivatives. The reactive thioester derivatives are useful as intermediate for the preparation of cephalosporin antibiotics having the formula (II). In addition, the present invention also relates to a process for preparation of cephalosporin antibiotics using the said thioester derivatives.
- wherein, R1 represents H, trityl, CH3, CRaRbCOOR3 (Ra and Rb independently of one another represents hydrogen or methyl and R3 represents H or C1-C7 alkyl).
- R2 represents C1-C4 alkyl or phenyl
-
- Activation of acid (IV) is reported by SO2Cl2/DMF in U.S. Pat. No. 5,856,502 and SOCl2/DMF in U.S. Pat. No. 5,037,988. These processes suffer the limitation of using harmful and pungent smelling chemicals like SOCl2, SO2Cl2 along with solvents like benzene, toluene, etc. and stringent conditions required for carrying out the reactions at commercial scale.
- In U.S. Pat. Nos. 4,576,749 and 4,548,748 the acid of formula (IV) have also been activated by reacting with 1-hydroxybenzotriazole (HOBT) or 2-mercaptobenzothiazole (MBT) in the presence of dicyclohexylcarbodiimide (DCC) to produce reactive ester of the acid (IV) which then reacted to cephem moiety to prepare cephem antibiotics, but the processes are time consuming and with low yields, hence not suitable.
- U.S. Pat. No. 4,767,852 discloses a process for production of cephems by acylating 7-amino-3-cephem-4-carboxylic acid with 2-mercaptobenzothiazolyl-(Z)-2-(2-aminothiazol-4-yl)-2-methoxyiminoacetate (MAEM). Similarly, U.S. Pat. No. 5,026,843 (1991) disclosed a process for preparing ceftriaxone disodium hemiheptahydrate by acylation of ACT by using MAEM as acylating agents in good yield and quality. Thus MAEM has become the standard acylating agent for the preparation of cephalosporins having an oximino group and a 2-aminothiazolyl group in 7-position of cephem compounds.
- However, the synthesis of MAEM from acid (III) and 2,2′-dithio-bis-benzothiazole involves use of costly condensing agent triphenylphosphine (TPP). Moreover, during condensation of MAEM with 7-amino-3-cephem-4-carboxylic acid compound (III), a toxic compound MBT is also produced as a byproduct, see e.g., Chemical Abstracts, 111, 19243p (1989) which is difficult to remove completely.
- Thus it is evident that the procedures described in the prior art for preparation of these antibiotics are complex, involving protection, deprotection and are associated with toxic byproduct generation. Hence there is a need to develop new acylating agents which are capable of transferring the 2-aminothiazolyl moiety to cephem compounds of formula (III) in good yield but without producing this toxic byproduct. On the similar lines, a new thioester was reported by D. G. Walker, Tet. Lett. 1990, 31,6481 to acylate the cephem moiety to get cefepime sulfate but yields obtained by using this thioester were in the range of 54-73% which cannot be considered as good yield to operate a process at commercial scale. The use of this thioester was reported in the Tet. Lett. 1990, 31, 6481 only for cefepime and not for other cephalosporins. This thioester was exploited in U.S. Pat. No. 5,869,649 for making three other important cephem antibiotics.
- The primary objective of the invention is to prepare novel thioester derivatives of thiazolyl acetic acid of the general formula (I), which would be better than the existing reactive derivatives and suitable for being used in the manufacture of cephalosporin antibiotics.
- Another objective of the present invention is to provide a process for the synthesis of thioester derivatives of formula (I) from thiazolyl acetic acid of the general formula (IV) and thio-oxadiazoles of the general formula (VI).
- Yet another objective of the present invention is to provide a simple, high yielding and cost-effective process for the preparation of cephalosporin antibiotics of the general formula (II).
- Still another objective of the present invention is to produce cephalosporin antibiotics that are highly pure and free from toxic byproducts.
- One more objective of the present invention is to provide a process for the preparation of cephalosporin antibiotics of the general formula (II) from the said novel thioester derivatives.
- The present invention provides novel thioester derivatives of thiazolyl acetic acid of the general formula (I). The invention also provides a method by which the said thioester derivatives can be prepared. The thioester derivatives so obtained are reacted with 7-amino-cephem carboxylic acids of the general formula (III) to produce cephalosporin antibiotic compounds having the general formula (II).
- The present invention provides new thioesters of the general formula (I) that are prepared by a novel method which has not been reported in the prior art. The use of these compounds in the process for preparing cephem derivatives renders the process entirely new and different from others. The novel derivative of thiazolyl acetic acid is represented by the formula (I)
- wherein, R1 represents H, trityl, CH3, CRaRbCOOR3 (Ra and Rb independently of one another represents hydrogen or methyl and R3 represents H or C1-C7 alkyl).
- R2 represents C1-C4 alkyl or phenyl
- The synthesis of compound (I) is achieved by reacting thiazolyl acetic acid of the general formula (IV) with thio-oxadiazoles of the general formula (VI) in organic solvent in presence of an organic base. The condensation is done with the help of a condensation agent of the formula (V). When the above reaction is carried out, the temperature is maintained between −10° and +30° C.
- wherein, R1 represents H, trityl, CH3, CRaRbCOOR3 (Ra and Rb independently of one another represents hydrogen or methyl and R3 represents H or C1-C7 alkyl).
-
-
- or a standard cephalosporin substituent.
- R5 is hydrogen, salt or carboxylic protecting group.
- R6 is hydrogen or silyl.
- In an embodiment the organic solvent is selected from the group comprising dichloromethane, tetrahydrofuran, dioxane, N,N-dimethylformamide, acetone, carbon tetrachloride and mixtures thereof.
- In another embodiment the condensation agent is bis-(2-oxo-oxazolidinyl) phosphinic chloride.
- In still another embodiment the organic base is selected from triethylamine, diethylamine, tributylamine, pyridine, N-alkylanilines, 1,8-diazabicyclo[5.4.2]undec-7-ene, 1,5-diazabicyclo[4.3.0]non-5-ene, N-methylmorpholine and mixtures thereof.
- The compound (I) so obtained is reacted with 7-amino cephem carboxylic acids of the general formula (III) in organic solvent in presence of organic base to obtain cephalosporin antibiotics of general formula (II).
-
- wherein, R1, R2R4, R5, & R6 are as defined above.
- The present invention provides a method by which cephalosporin antibiotics are obtained in high purity (95-99%) and excellent yield (79-95%) without the necessity for protecting the amino group of the acylating agents and the production of toxic byproduct namely 2-mercaptobenzothiazole is avoided.
- The substituent R4 in cephem compound (III) represents methyl, acetyloxymethyl, methoxymethyl, vinyl, pyridylmethyl, propenyl, 2,5-dihydro-6-hydroxy-2-methyl-5-oxo-1,2,4-triazine-3-thiol, furanyl-2-carbonyl thiol or a standard cephalosporin substituents defined by R4. In general, R4 represents —CH2—X wherein X is a residue of any organic or inorganic nucleophilic compound, e.g., halogen, hydroxy, cyano, mercapto, azido, amino, etc. Furthermore, X may preferably represent residue of any 5 or 6 membered heterocyclic thiol. The heterocyclic thiol contains one to four hetero atoms selected from a group of nitrogen, oxygen and/or sulfur. Some of the examples of five membered ring are 1,2,4-thiadiazolyl, 1,3,4-thiadiazolyl, 1H-tetrazolyl, 1,2,4-tetrazolyl, 1,2,3-tetrazolyl, 1,3,4-oxadiazolyl, 1,2,4-oxadiazolyl, etc. The six membered heterocyclic ring can be exemplified by pyridyl, pyrimidyl, pyridinyl-N-oxide, etc.
- R5 represents hydrogen, salt or a standard carboxylic protecting group.
- R6 is hydrogen or silyl.
- The condensation of cephem compound (III) with thioester (I) is performed by two different methodologies (a) by acylating the compound (III) (when R6 is H) with compound (I) in aqueous organic solvent; (b) by acylating compound (III) (when R6 is silyl) with compound (I) in aprotic organic solvents. Both the approaches are comparable and afforded excellent yields and purities of cephem antibiotics (II).
- Acylation of compounds of formula (III) (when R6 is H) is performed in presence of a water miscible solvent like tetrahydrofuran (THF), acetonitrile, acetone, dioxane, N,N-dimethylformamide etc. but the preferable solvents are THF and acetonitrile.
- In an embodiment of the present invention, acylation of compound of formula (III) (when R6 is silyl) is carried out in aprotic organic solvents like halogenated hydrocarbons, toluene, alkyl ethers etc., but the preferred solvent is dichloromethane. Suitable silylating agents used for the reaction are hexamethyldisalazane, bis(trimethyl)silylacetamide and trimethylsilyl chloride.
- In another embodiment of the present invention, the organic base may be selected from triethylamine, diethylamine, tributylamine, N-alkylpyridine, N-alkylanilines, 1,8-diazabicyclo[5.4.2]undec-7-ene, 1,5-diazabicyclo[4.3.0]non-5-ene, N-methylmorpholine, 1,4-diazabicyclo[2.2.2]octane, 4-dimethylamino pyridine and mixtures thereof.
- The utility of the novel thioesters of 2-mercapto-5-phenyl-1,3,4-oxadiazole was tried in various coupling reactions of carboxylic acids and amines. Most of amide formation reactions have shown good results. L-alanine, 5-methylisoxazole-4-carboxylic acid, 2-thienylacetic acid, etc. are some of the compounds, which have been activated by above mentioned thiol. Few results are summarized in the following table.
% by S. No. Acids Amines HPLC 1. 70-88% 2. 90-97% 3. 7-Aminocephalosporanic acid 80-90% - In an embodiment, R4 represents any of methyl, vinyl, methoxymethyl, pyridylmethyl, acetyloxymethyl, (2,5-dihydro-6-hydroxy-2-methyl-5-oxo-1,2,4-triazin-3-yl)thiomethyl, furylcarbonyl thiomethyl or a standard cephalosporin substituent.
- In another embodiment, R1 represents H, trityl, CH3, CRaRbCOOR3 (Ra and Rb independently of one another represents hydrogen or methyl and R3 represents H or C1-C7 alkyl). In still another embodiment, R5 is hydrogen or alkali metal salt.
- In yet another embodiment, the alkali metal salts are selected from sodium, potassium and lithium salts.
- In another embodiment, the compound of formula II is a syn isomer.
- In still another embodiment, R6 is silyl, the acylation is achieved by doing the reaction in aprotic organic solvent like halogenated hydrocarbon, toluene, alkyl ether preferably in dichloromethane.
- In another embodiment, R2 is methyl and R4 represents any of (2,5-dihydro-6-hydroxy-2-methyl-5-oxo-1,2,4-triazin-3-yl)thiomethyl, and purification of this compound is achieved by dissolving the crude product in mixture of water and water miscible organic solvent selected from acetone, IPA, dioxane and mixture thereof.
- In another embodiment, the organic base is selected from the group consisting of triethylamine, N-methylmorpholine, N-methylpyridines, N-methylanilines, 1,5-diazabicyclo[4.3.0] non-5-ene, 1,4-diazabicyclo[2.2.2]octane, 4-dimethylaminopyridine, and mixtures thereof.
- In an embodiment, R2 is methyl, R4 is (2,5-dihydro-6-hydroxy-2-methyl-5-oxo-1,2,4-triazin-3-yl)thiomethyl, the colour impurities are separated at −10° C. to 0° C. and precipitation by water miscible organic solvent selected from acetone, IPA, dioxane and mixture thereof
- Thus the present invention provides novel thioester derivatives of thiazolyl acetic acid of the general formula (I), also, the invention provides a method by which the said thioester derivatives can be prepared by reacting thiazolyl acetic acid of the general formula (IV) with 2-mercapto-5-substituted-1,3,4-oxadiazole of the general formula (VI) (preparation of VI, J. Am. Chem. Soc., 1955, 77, 400) in a solvent, in presence of an organic base and with the help of condensation agent bis-(2-oxo-oxazolidinyl) phosphinic chloride of the formula (V) (preparation of V, Synthesis, 1980, 547). The so obtained thioester derivatives are reacted with 7-amino-cephem carboxylic acids of the general formula (III) to produce cephalosporin antibiotic compounds having the general formula (II). The cephalosporin antibiotics so obtained are of high purity (95-99%). The method gives an excellent yield (79-95%) of cephalosporin without necessitating for the protection of the amino group of the acylating agents, and the toxic byproduct 2-mercaptobenzothiazole is not produced.
- Many other beneficial results can be obtained by applying disclosed invention in a different manner or by modifying the invention with the scope of disclosure. However, since the major characteristic feature of the present invention resides in the use of novel reactive thioester derivatives of thiazolyl acetic acid of the general formula (I) in preparing the cephalosporin antibiotics, the technical scope of the present invention should not be limited to the following examples.
- The following examples are provided to illustrate but not to limit the claimed invention.
- (Z)-(2-aminothiazol-4-yl)methoxyimino acetic acid (20.1 g), triethylamine (22.2 g) were suspended in dry dichloromethane (150 ml), and then bis-(2-oxo-oxazodinyl)phosphinic chloride (25.4 g) was added in one lot at 0-5° C. and stirred for 1 hr. The 2-mercapto-5-phenyl-1,3,4-oxadiazole (21.3 g) was added at 0-5° C. The reaction mixture was stirred for 3-4 hours. After the reaction was complete, distilled water 100 ml was added to the reaction solution and the mixture was stirred for 10 min. The organic layer was separated and washed successively with 2% aq. solution bicarbonate solution (100×2 ml) and saturated saline (100 ml), dried over sodium sulphate, filtered and then concentrated under reduced pressure. To the residue, IPE (isopropyl ether) (300 ml) was added and solid was filtered, washed with IPE (100 ml). Dried to obtain 30.6 g (yield 85%) of the title compound as light yellow solid.
- Melting point: 109-110° C.1HNMR (DMSO-d6): δ3.90 (3H,s,N—OCH3), 7.11(1H,s, thiazole ring proton), 7.29(2H,bs,NH2), 7.6-7.9(5H, m, —C6H5) 13C-NMR (Acctone-d6): δ 63.16, 108.7, 122.1, 129.7, 132.6, 133.7, 141.6, 146.75, 159.3, 159.6, 169.7, 173.1.
- (Z)-(2-Aminothiazol-4yl)methoxyimino acetic acid (20.1 g), triethylamine (22.2 g) were suspended in dry dichloromethane (150 ml), and then bis-(2-oxo-oxazodinyl)phosphinic chloride (25.4 g) was added in one lot at 0-5° C. and stirred for 1 hr. The 2-mercapto-5-methyl-1,3,4-oxadiazole (13.0 g) was added at 0-5° C. The reaction mixture was stirred for 3-4 hours and worked up in the same way as described in example-I to obtain 25.8 g (yield 84%) of the title compound as light yellow solid.
- Melting point: 80-81° C.1HNMR (DMSO-d6): δ2.42(3H,s,CH3), 3.8(3H,s,OCH3), 7.06(1H,s,thiazole ring), 7.3(2H,bs,NH2) 13C-NMR(DMSO-d6): δ 11.8, 67.9, 109.0, 141.0, 146.9, 160.0, 161.5, 169.8, 173.7.
- (Z)-2-(2-aminothiazol-4-yl)-(methoxycarbonyl) methoxyimino acetic acid (3.88 g) was suspended in dichloromethane (40 ml), TEA (triethylamine) (3.33 g) was added at 0°-10° C. followed by addition of bis-(2-oxo-oxazolidinyl)phosphinic chloride (3.81 g). The mixture was stirred for 1 hr. and 2-mercapto-5-phenyl-1,3,4-oxadiazole (2.6 g) was added. The reaction was monitored by HPLC. After completion of reaction, it was worked up as described in example I, to obtain 4.5 g (72%) title compound as yellow solid.
- Melting point: 115-117° C.1H-NMR : δ3.61(3H,s,—COOCH3), 4.79(2H,s,—OCH2—CO), 7.14(1H,s,thiazole H), 7.34(2H,bs,NH2), 7.6-7.9 (5H,m,—C6H5) 13C-NMR : δ 52.6, 72.1, 109.9, 111.1, 127.4, 129.8, 133.8, 141.1, 147.7, 159.3, 159.9, 169.4, 166.7.
- 7-Amino-3-[[(2,5-dihydro-6-hydroxy-2-methyl-5-oxo-1,2,4-triazin-3yl)thio]methyl]3-cephem-4-carboxylic acid (20.0 g) and 2-mercapto-5-phenyl-1,3,4-oxadiazolyl-(Z)-2-(2-aminothiazol-4-yl) 2-methoxyiminoacetate (23.3 g) were suspended in a mixture of THF (180 ml), H2O (80 ml) and DMAc (dimethyl acetamide) (30 ml) maintained at 0°-1° C. under stirring. Triethylamine (11.9 ml) was added in 2-3 hours at 5° C. maintaining the pH 7.5-8.5. The reaction progress was monitored by HPLC. After the reaction was complete, the mixture was extracted with dichloromethane (3×100 ml). The aq. layer was separated and treated with charcoal (0.2 g). A solution of sodium-2-ethylhexanoate (30.5 g) in acetone was added to filtrate at 10-15° C. and stirred for 1.5 hours (400 ml) of acetone was added in 1 hour at 10-15° C. to complete the crystallization. The product was filtered under N2 atmosphere and wet cake was dissolved in mixture of water and acetone (1:2), and cooled to −10° C. Coloured impurities were separated. The solution was decanted and diluted with acetone (600 ml) at 18-20° C. Precipitated solid was filtered under N2 and washed with acetone (20 ml). Dried under vacuum at 40-45° C. to get pure Ceftriaxone sodium, 28.5 g (yield 890%).
- HPLC (purity): 99.0%
- 7-Amino-3-[[(2,5-dihydro-6-hydroxy-2-methyl-5-oxo-1,2,4-triazin-3yl)thio]methyl]- 3-cephem-4-carboxylic acid (20.0 g) was suspended in dichloromethane (200 ml). To this was added hexamethyldisilazane (15.0 g) and trimethylsilyl chloride (3.0 g). The suspension was refluxed for 2-3 hours to get clear solution. Cooled to 0° C. and triethylamine (13.6 g) was added slowly. At the same temperature, 2-mercapto-5-phenyl-1,3,4-oxadiazolyl-(Z)-2-(2-aminothiazol-4-yl) 2-methoxyiminoacetate (23.3 g) was added. The reaction mixture was monitored by HPLC. After completion of reaction, 200 ml water was added and pH was adjusted to 7.0. The aqueous layer was separated, charcoalized and treated with sodium-2-ethylhexanoate (30.5 g) in acetone, reaction was proceeded by same method as mentioned in Ex-IV to get crude ceftriaxone sodium (25.0 g)
- A mixture of THF (250 ml) and water (150 ml) and N,N-dimethylacetamide (25.0 ml) was stirred under inert atmosphere. At 0°-1° C., 7-aminocephalosporanic acid (25.0 g) and 2-mercapto-5-phenyl-1,3,4-oxadiazolyl-(Z)-2-(2-aminothiazol-4-yl)2-methoxyimino acetate (39.8 g) were added. Triethylamine (20.4 g) was slowly added to reaction by maintaining pH 7.5 to 8.5. The reaction was followed by HPLC. After 4-5 hrs., the reaction mixture was extracted by methylene chloride. The aqueous layer is subjected for charcoal (0.125 g) treatment. Ethylacetate was added to the filtrate and the solution was acidified with dil. HCl at 10° C. to pH 3.0. The solid separated was filtered, washed with water and ethylacetate and then dried under vacuum at 40-45° C. to get Cefotaxime, 40.9 g (yield 98%).
- HPLC (purity)=98-99%
- 7-Aminocephalosporanic acid (25.0 g) was taken in dichloromethane (200 ml). Hexamethyldisilazane (14.7 g) and trimethylsilyl chloride (5.1 g) were added to it and slurry was refluxed till a clear solution is obtained. The clear solution was cooled to 0° C. and triethylamine (13.9 g) was added to it. At 0° C., 2-mercapto-5-phenyl-1,3,4-oxadiazolyl-(Z)-2-(2-aminothiazol-4-yl)-2-methoxyimino acetate (39.0 g) was added, reaction was monitored by HPLC. After 4-5 hrs., HPLC showed disappearance of 7-amino cephalosporanic acid. Water (200 ml) was added to reaction mixture and pH of mixture was adjusted by triethylamine to 7.0-7.5. The aq. layer was separated and treated with charcoal. Ethylacetate was added to aq. layer and pH was adjusted to 3.0 at 10° C. The solid was filtered and washed with water and ethylacetate. Dried under vacuum at 40° C. to get 36.0 g of cefotaxime acid.
- HPLC (purity)=97-98%
- A mixture of THF (200 ml) and water (200 ml) was stirred at 0-1° C. under inert atmosphere, 7-amino-3-vinyl-3-cephem-4-carboxylic acid (21.4 g) and 2-mercapto-5-phenyl-1,3,4-oxadiazolyl-(Z)-[2-(aminothiazol-4-yl)methoxycarbonyl methoxyimino]acetate (46.0 g) were added. Triethylamine (15.1 g) was added slowly and reaction mixture was stirred at 0-5° C. maintaining at pH 7.5 to 8.5. The reaction was monitored by HPLC, after completion of reaction, it was worked up as described in example (V). The wet product is taken in water and treated with aq. sodium hydroxide (7.19 g) solution at 0-2° C. After 10 min., pH was lowered to 7.0 by addition of acetic acid.
- The solution was treated with charcoal, filtered and acidified with 1N HCl. Solid precipitated was filtered, washed with water and dried under vacuum to give Cefixime, 36.2 g (yield 80%).
- HPLC (Purity): 99.5%
- 7-Aminodiacetyloxy cephalosporanic acid (2.14 g), active ester, 2-mercapto-5-phenyl-1,3,4-oxadiazolyl-(Z)-2-(2-aminothiazol-4-yl)-2-methoxyimino acetate (3.97 g) were suspended in mixture of THF (tetrahydrofuran) (20 ml) and water (20 ml). TEA was added slowly. The reaction was proceeded in same way as described in example to obtain Cefetamet, 3.65 g (yield 92%).
- HPLC (purity): 99.0%
- 7-Amino-3-methoxymethyl-3-cephem-4-carboxylic acid (24.2 g) and 2-mercapto-5-phenyl-1,3,4-oxadiazolyl-(Z)-2-(2-aminothiazol-4-yl)-2-methoxyimino acetate (39.7 g) were suspended in 400 ml of THF and water mixture (1:1). At 10° C. TEA added to maintain pH 7-8. The reaction was monitored and proceeded as described in example IV. To the separated aq. layer, pH was adjusted to 2.7 using 16-18% sulphuric acid. Solid was cooled to 10° C., filtered and washed with water (3×50 ml) and finally with acetone (20 ml) to obtain the Cefpodoxime acid, 37.5 g (yield 88%).
- HPLC (purity): 98.0%
- 7-Amino-3-[(2-furanylcarboxyl)thiomethy]-3-cephem-4-carboxylic acid (3.4 g) and 2-mercapto-5-phenyl-1,3,4-oxadiazolyl-(Z)-2-(2-aminothiazol-4-yl)-2-methoxyimino acetate (4.0 g) were added to a mixture of THF (35 ml) and water (35ml) at temperature 5° C. The pH of reaction was maintained at 7.5 to 8.5 by addition of TEA during the reaction. After completion of reaction, the reaction was extracted with methylene chloride (25 ml×3). The aqueous layer was diluted with 15 ml THF and pH was lowered to 3 by addition of 1N HCl. The solution is saturated by salt. The organic layer was separated and pH was further adjusted to 0.5 by concentrated HCI. IPE (250 ml) was added to precipitate the hydrochloride salt of Ceftiofur, 4.43 g (yield 79.0%).
- HPLC (purity): 98.0%
Claims (13)
2. A process for preparing thiazolylacetic acid derivative represented by formula (I), said process comprises the step of reacting a thiazolylacetic acid represented by formula (IV)
wherein, R1 represents H, trityl, CH3, CRaRbCOOR3 (Ra and Rb independently of one another represents hydrogen or methyl and R3 represents H or C1-C7 alkyl).
with thio-oxadiazole of formula (VI) in presence of an organic solvent base and a
wherein, R2 represents C1-C4 alkyl or phenyl condensation agent at temperature being maintained in the range −10° C. to +30° C.
3. The process of claim 2 wherein the organic solvent is selected from the group comprising dichloromethane, tetrahydrofuran, dioxane, N,N-dimethylformamide, acetone, carbon tetrachloride and mixture thereof.
4. The process of claim 2 wherein the organic base is selected from the group comprising triethylamine, diethylamine, tributylamine, pyridine, N-alkylanilines, 1,8-diazabicyclo[5.4.2]undec-7-ene, 1,5-diazabicyclo[4.3.0]non-5-ene, N-methylmorpholine and mixtures thereof.
5. The process of claim 2 wherein the condensation agent selected is bis-(2-oxo-oxazolidinyl)phosphinic chloride.
6. A process for preparing a compound of formula (II)
wherein, R1 represents H, trityl, CH3, CRaRbCOOR3 (Ra and Rb independently of one another represents hydrogen or methyl and R3 represents H or C1-C7 alkyl).
R4 is CH3, —CH═CH2, CH2OCH3, CH2OCOCH3,
or a standard cephalosporins substituent.
R5is H or a salt or a carboxylic protecting group.
R6 is H or silyl
acylating a compound of formula (III)
wherein, R4, R5 and R6 are defined as above with a compound of formula I. In the presence of an organic solvent, organic base and a silylating agent at a temperature in the range of −10° C. to +30° C.
wherein, R1 & R2 are as defined above.
7. The process of claim 6 wherein R5 is hydrogen or alkali metal salt.
8. The process of claim 6 wherein said compound of formula II is a syn isomer.
9. The process of claim 6 wherein R6 is H, the acylation is done in the presence of water and an organic solvent selected from the group consisting of tetrahydrofuran, N,N-dimethylacetamide, N,N-dimethylformamide, dioxane, and mixtures thereof.
10. The process of claim 6 wherein R6 is silyl, the acylation is achieved by doing the reaction in aprotic organic solvent like halogenated hydrocarbon, toluene, alkyl ether preferably in dichloromethane.
11. The process of claim 6 wherein the organic base is selected from the group consisting of triethylamine, N-methylmorpholine, N-methylpyridines, N-methylanilines, 1,5-diazabicyclo[4.3.0]non-5-ene, 1,4-diazabicyclo[2.2.2]octane, 4-dimethylaminopyridine, and mixtures thereof.
12. The process of claim 6 wherein R2 is methyl, R4 is (2,5-dihydro-6-hydroxy-2-methyl-5-oxo-1,2,4-triazin-3-yl)thiomethyl, purification of this compound is achieved by dissolving the crude product in mixture of water and water miscible organic solvent selected from acetone, IPA, dioxane and mixture thereof.
13. The process of claim 6 wherein R2 is methyl, R4 is (2,5-dihydro-6-hydroxy-2-methyl-5-oxo-1,2,4-triazin-3-yl)thiomethyl, the colour impurities are separated at −10° C. to 0° C. and precipitation by water miscible organic solvent selected from acetone, IPA, dioxane and mixture thereof.
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CN107955021A (en) * | 2017-10-27 | 2018-04-24 | 苏州盖德精细材料有限公司 | A kind of production method of the Ceftriaxone Sodium of low impurity |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
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US6388070B1 (en) * | 2001-01-05 | 2002-05-14 | Orchid Chemicals & Pharmaceuticals Ltd. | Thioester derivatives of thiazolyl acetic acid and their use in the preparation of cephalosporin compounds |
US6555680B1 (en) * | 2001-12-10 | 2003-04-29 | Orchid Chemicals & Pharmaceuticals Ltd. | Method for the preparation of ceftiofur sodium |
US6610845B1 (en) * | 2002-01-04 | 2003-08-26 | Orchid Chemicals & Pharmaceuticals Limited, India | Thioester derivatives of thiazolyl acetic acid and their use in the preparation of cephalosporin compounds |
Family Cites Families (3)
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DE3165922D1 (en) * | 1980-03-28 | 1984-10-18 | Biochemie Gmbh | New process for the production of cephalosporin antibiotics, and novel intermediates used in such process and their production |
IN184690B (en) * | 1996-03-18 | 2000-09-23 | Ranbaxy Lab Ltd | |
AU690482B2 (en) * | 1996-03-18 | 1998-04-23 | Ranbaxy Laboratories Limited | Process for producing cephalosporin antibiotics |
-
2001
- 2001-01-05 US US09/754,302 patent/US6388070B1/en not_active Expired - Fee Related
- 2001-02-28 CN CNA018229824A patent/CN1492867A/en active Pending
- 2001-02-28 WO PCT/IN2001/000028 patent/WO2002053563A1/en not_active Application Discontinuation
- 2001-02-28 CA CA002433783A patent/CA2433783A1/en not_active Abandoned
- 2001-02-28 JP JP2002555086A patent/JP2004520336A/en not_active Withdrawn
- 2001-02-28 EP EP01923956A patent/EP1347970A1/en not_active Withdrawn
- 2001-02-28 KR KR10-2003-7009064A patent/KR20030078882A/en not_active Application Discontinuation
- 2001-02-28 BR BR0116723-5A patent/BR0116723A/en not_active IP Right Cessation
- 2001-02-28 US US10/250,655 patent/US20040087787A1/en not_active Abandoned
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6388070B1 (en) * | 2001-01-05 | 2002-05-14 | Orchid Chemicals & Pharmaceuticals Ltd. | Thioester derivatives of thiazolyl acetic acid and their use in the preparation of cephalosporin compounds |
US6555680B1 (en) * | 2001-12-10 | 2003-04-29 | Orchid Chemicals & Pharmaceuticals Ltd. | Method for the preparation of ceftiofur sodium |
US6610845B1 (en) * | 2002-01-04 | 2003-08-26 | Orchid Chemicals & Pharmaceuticals Limited, India | Thioester derivatives of thiazolyl acetic acid and their use in the preparation of cephalosporin compounds |
Also Published As
Publication number | Publication date |
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WO2002053563A1 (en) | 2002-07-11 |
KR20030078882A (en) | 2003-10-08 |
JP2004520336A (en) | 2004-07-08 |
CN1492867A (en) | 2004-04-28 |
EP1347970A1 (en) | 2003-10-01 |
BR0116723A (en) | 2005-02-01 |
US6388070B1 (en) | 2002-05-14 |
CA2433783A1 (en) | 2002-07-11 |
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