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PH21195A - Process for the preparation of 2-penem compounds - Google Patents

Process for the preparation of 2-penem compounds

Info

Publication number
PH21195A
PH21195A PH26819A PH26819A PH21195A PH 21195 A PH21195 A PH 21195A PH 26819 A PH26819 A PH 26819A PH 26819 A PH26819 A PH 26819A PH 21195 A PH21195 A PH 21195A
Authority
PH
Philippines
Prior art keywords
preparation
compounds
alkyl
pharmaceutically acceptable
acceptable salts
Prior art date
Application number
PH26819A
Other languages
English (en)
Inventor
Adriano Afonso
Frank Hon
Original Assignee
Schering Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Schering Corp filed Critical Schering Corp
Publication of PH21195A publication Critical patent/PH21195A/en

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D499/00—Heterocyclic compounds containing 4-thia-1-azabicyclo [3.2.0] heptane ring systems, i.e. compounds containing a ring system of the formula:, e.g. penicillins, penems; Such ring systems being further condensed, e.g. 2,3-condensed with an oxygen-, nitrogen- or sulfur-containing hetero ring
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D487/00—Heterocyclic compounds containing nitrogen atoms as the only ring hetero atoms in the condensed system, not provided for by groups C07D451/00 - C07D477/00
    • C07D487/02—Heterocyclic compounds containing nitrogen atoms as the only ring hetero atoms in the condensed system, not provided for by groups C07D451/00 - C07D477/00 in which the condensed system contains two hetero rings
    • C07D487/04—Ortho-condensed systems
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P31/00—Antiinfectives, i.e. antibiotics, antiseptics, chemotherapeutics
    • A61P31/04—Antibacterial agents
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D205/00—Heterocyclic compounds containing four-membered rings with one nitrogen atom as the only ring hetero atom
    • C07D205/02—Heterocyclic compounds containing four-membered rings with one nitrogen atom as the only ring hetero atom not condensed with other rings
    • C07D205/06—Heterocyclic compounds containing four-membered rings with one nitrogen atom as the only ring hetero atom not condensed with other rings having one double bond between ring members or between a ring member and a non-ring member
    • C07D205/08—Heterocyclic compounds containing four-membered rings with one nitrogen atom as the only ring hetero atom not condensed with other rings having one double bond between ring members or between a ring member and a non-ring member with one oxygen atom directly attached in position 2, e.g. beta-lactams
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D205/00—Heterocyclic compounds containing four-membered rings with one nitrogen atom as the only ring hetero atom
    • C07D205/02—Heterocyclic compounds containing four-membered rings with one nitrogen atom as the only ring hetero atom not condensed with other rings
    • C07D205/06—Heterocyclic compounds containing four-membered rings with one nitrogen atom as the only ring hetero atom not condensed with other rings having one double bond between ring members or between a ring member and a non-ring member
    • C07D205/08—Heterocyclic compounds containing four-membered rings with one nitrogen atom as the only ring hetero atom not condensed with other rings having one double bond between ring members or between a ring member and a non-ring member with one oxygen atom directly attached in position 2, e.g. beta-lactams
    • C07D205/09—Heterocyclic compounds containing four-membered rings with one nitrogen atom as the only ring hetero atom not condensed with other rings having one double bond between ring members or between a ring member and a non-ring member with one oxygen atom directly attached in position 2, e.g. beta-lactams with a sulfur atom directly attached in position 4
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D477/00—Heterocyclic compounds containing 1-azabicyclo [3.2.0] heptane ring systems, i.e. compounds containing a ring system of the formula:, e.g. carbapenicillins, thienamycins; Such ring systems being further condensed, e.g. 2,3-condensed with an oxygen-, nitrogen- or sulphur-containing hetero ring
    • C07D477/02—Preparation
    • C07D477/04—Preparation by forming the ring or condensed ring systems
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D477/00—Heterocyclic compounds containing 1-azabicyclo [3.2.0] heptane ring systems, i.e. compounds containing a ring system of the formula:, e.g. carbapenicillins, thienamycins; Such ring systems being further condensed, e.g. 2,3-condensed with an oxygen-, nitrogen- or sulphur-containing hetero ring
    • C07D477/10—Heterocyclic compounds containing 1-azabicyclo [3.2.0] heptane ring systems, i.e. compounds containing a ring system of the formula:, e.g. carbapenicillins, thienamycins; Such ring systems being further condensed, e.g. 2,3-condensed with an oxygen-, nitrogen- or sulphur-containing hetero ring with hydrogen atoms, hydrocarbon or substituted hydrocarbon radicals, directly attached in position 4, and with a carbon atom having three bonds to hetero atoms with at the most one bond to halogen, e.g. an ester or nitrile radical, directly attached in position 2
    • C07D477/12—Heterocyclic compounds containing 1-azabicyclo [3.2.0] heptane ring systems, i.e. compounds containing a ring system of the formula:, e.g. carbapenicillins, thienamycins; Such ring systems being further condensed, e.g. 2,3-condensed with an oxygen-, nitrogen- or sulphur-containing hetero ring with hydrogen atoms, hydrocarbon or substituted hydrocarbon radicals, directly attached in position 4, and with a carbon atom having three bonds to hetero atoms with at the most one bond to halogen, e.g. an ester or nitrile radical, directly attached in position 2 with hydrogen atoms, hydrocarbon or substituted hydrocarbon radicals, attached in position 6
    • C07D477/16—Heterocyclic compounds containing 1-azabicyclo [3.2.0] heptane ring systems, i.e. compounds containing a ring system of the formula:, e.g. carbapenicillins, thienamycins; Such ring systems being further condensed, e.g. 2,3-condensed with an oxygen-, nitrogen- or sulphur-containing hetero ring with hydrogen atoms, hydrocarbon or substituted hydrocarbon radicals, directly attached in position 4, and with a carbon atom having three bonds to hetero atoms with at the most one bond to halogen, e.g. an ester or nitrile radical, directly attached in position 2 with hydrogen atoms, hydrocarbon or substituted hydrocarbon radicals, attached in position 6 with hetero atoms or carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. an ester or nitrile radical, directly attached in position 3
    • C07D477/22—Nitrogen atoms
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D499/00—Heterocyclic compounds containing 4-thia-1-azabicyclo [3.2.0] heptane ring systems, i.e. compounds containing a ring system of the formula:, e.g. penicillins, penems; Such ring systems being further condensed, e.g. 2,3-condensed with an oxygen-, nitrogen- or sulfur-containing hetero ring
    • C07D499/88—Compounds with a double bond between positions 2 and 3 and a carbon atom having three bonds to hetero atoms with at the most one bond to halogen, e.g. an ester or nitrile radical, directly attached in position 2
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D503/00—Heterocyclic compounds containing 4-oxa-1-azabicyclo [3.2.0] heptane ring systems, i.e. compounds containing a ring system of the formula:, e.g. oxapenicillins, clavulanic acid derivatives; Such ring systems being further condensed, e.g. 2,3-condensed with an oxygen-, nitrogen- or sulfur-containing hetero ring
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07F—ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
    • C07F7/00—Compounds containing elements of Groups 4 or 14 of the Periodic Table
    • C07F7/02—Silicon compounds
    • C07F7/08—Compounds having one or more C—Si linkages
    • C07F7/18—Compounds having one or more C—Si linkages as well as one or more C—O—Si linkages
    • C07F7/1804—Compounds having Si-O-C linkages

Landscapes

  • Organic Chemistry (AREA)
  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Molecular Biology (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Pharmacology & Pharmacy (AREA)
  • Oncology (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Medicinal Chemistry (AREA)
  • Communicable Diseases (AREA)
  • General Chemical & Material Sciences (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
  • Nitrogen Condensed Heterocyclic Rings (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Nitrogen And Oxygen Or Sulfur-Condensed Heterocyclic Ring Systems (AREA)
  • Acyclic And Carbocyclic Compounds In Medicinal Compositions (AREA)
  • Plural Heterocyclic Compounds (AREA)
PH26819A 1981-02-02 1982-02-02 Process for the preparation of 2-penem compounds PH21195A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US06/230,774 US4347183A (en) 1981-02-02 1981-02-02 Process for the synthesis of penems and carbapenems

Publications (1)

Publication Number Publication Date
PH21195A true PH21195A (en) 1987-08-19

Family

ID=22866531

Family Applications (1)

Application Number Title Priority Date Filing Date
PH26819A PH21195A (en) 1981-02-02 1982-02-02 Process for the preparation of 2-penem compounds

Country Status (17)

Country Link
US (1) US4347183A (fi)
EP (2) EP0162193A1 (fi)
JP (1) JPS57146777A (fi)
KR (1) KR880001774B1 (fi)
AT (1) ATE21699T1 (fi)
AU (1) AU557691B2 (fi)
DE (1) DE3272792D1 (fi)
DK (1) DK160877C (fi)
FI (1) FI74966C (fi)
HU (1) HU189559B (fi)
IE (1) IE54214B1 (fi)
IL (1) IL64905A (fi)
NO (1) NO159795C (fi)
NZ (1) NZ199599A (fi)
PH (1) PH21195A (fi)
PT (1) PT74356B (fi)
ZA (1) ZA82567B (fi)

Families Citing this family (37)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL8102736A (nl) * 1980-06-06 1982-01-04 Sankyo Co Penem-3-carbonzuurverbindingen en hun bereiding.
EP0046363B1 (en) * 1980-08-16 1984-11-14 Beecham Group Plc Process for the preparation of 2-thio penem derivatives and intermediates therefor
DE3274982D1 (en) * 1981-07-08 1987-02-12 Hoechst Uk Ltd Antibacterial penem derivatives
ES513672A0 (es) * 1981-07-08 1983-04-01 Hoechst Uk Ltd "procedimiento para la preparacion de derivados de penem".
US4552873A (en) * 1981-08-19 1985-11-12 Sankyo Company Limited Carbapenem compounds, and compositions containing them
FI77662C (fi) * 1982-07-08 1989-04-10 Hoechst Uk Ltd Foerfarande foer framstaellning av nya antibakteriella penemderivat.
KR900006449B1 (ko) * 1982-08-24 1990-08-31 상꾜 가부시끼가이샤 아제티디논 화합물의 제조방법
US4794109A (en) * 1982-11-16 1988-12-27 Ciba-Geigy Corporation 6-hydroxy-lower alkylpenem compounds, pharmaceutical preparations that contain these compounds, and the use of the latter
EP0109044B1 (en) * 1982-11-16 1986-10-15 Schering Corporation Penems, pharmaceutical compositions containing them, process for preparing them
DE3382761T2 (de) * 1982-11-29 1995-03-09 Schering Corp Verfahren zur Herstellung von Penem-Verbindungen.
EP0115308A3 (en) * 1983-01-25 1984-10-10 Merck & Co. Inc. 2-unsaturated alkylthio-pen-2-em-3-carboxylic acids and process for preparing substituted 2-thioxopenams and 2-substituted thiopenems
US4595539A (en) * 1983-06-10 1986-06-17 Pfizer Inc. Preparation of penem derivatives and azetidinone intermediates
US4725678A (en) * 1983-06-10 1988-02-16 Pfizer Inc. Azetidinone intermediates for the preparation of penem derivatives
US4619783A (en) * 1983-06-10 1986-10-28 Pfizer Inc. Process and intermediates for the preparation of penem derivatives
GB8321677D0 (en) * 1983-08-11 1983-09-14 Erba Farmitalia Preparation of penems
US4656165A (en) * 1983-09-02 1987-04-07 Ciba-Geigy Corporation Aminomethyl penem compounds
EP0134301A1 (en) * 1983-09-15 1985-03-20 Merck & Co. Inc. 6-(1'-Hydroxyethyl)-3-substituted amino-1-azabicyclo(3.2.0)-hept-2-en-7-one-2-carboxylic acid
JPS60224672A (ja) * 1984-04-23 1985-11-09 Sumitomo Chem Co Ltd β−ラクタム誘導体の製造法
US4761408A (en) * 1984-11-02 1988-08-02 Ciba-Geigy Corporation Crystalline aminomethyl compound
US4680292A (en) * 1984-12-13 1987-07-14 Merck & Co., Inc. Carbapenems and 1-methylcarbapenems having a 2-heteroaryliumaliphatic substituent
AU577105B2 (en) * 1985-04-02 1988-09-15 T.P.O. :Pharmachim: Acylaminic penicillin derivatives
US4782051A (en) * 1985-06-10 1988-11-01 Merck & Co., Inc. 2-aza-substituted 1-carbadethiapen-2-em-3 carboxylic acids
US4833167A (en) * 1985-06-10 1989-05-23 Merck & Co., Inc. 2-aza-substituted 1-carbadethiapen-2-em-3-carboxylic acids
EP0208889A1 (en) * 1985-06-10 1987-01-21 Merck & Co. Inc. 2-Aza-substituted 1-carbadethiapen-2-EM-3-carboxylic acids
US5140030A (en) * 1985-06-10 1992-08-18 Merck 2-aza-substituted 1-carbadethiapen-2-em-3-carboxylic acids
US4783453A (en) * 1985-06-10 1988-11-08 Merck & Co., Inc. 2-aza-substituted 1-carbadethiapen-2-em-3-carboxylic acids
US5215997A (en) * 1985-09-11 1993-06-01 Ciba-Geigy Corporation Synthesis of beta-lactam compounds
ATE93861T1 (de) * 1985-09-11 1993-09-15 Ciba Geigy Ag Synthese von beta-lactamverbindungen.
ES2029794T3 (es) * 1985-10-17 1992-10-01 Pfizer Inc. Procedimiento de preparacion de antibioticos de 2-(1-oxo-3-tiolanil)-2-penem.
US5075438A (en) * 1986-07-21 1991-12-24 Schering Corporation Synthesis of azetidinones
US4767853A (en) * 1986-07-21 1988-08-30 Schering Corporation Synthesis of 1-(allyloxycarbonyl)-methyl-3-(hydroxyethyl)-4-beta-naphthoxythiocarbonylthio-2-azetidinones and hydroxy protected analogs thereof
US5053502A (en) * 1986-07-21 1991-10-01 Schering Corporation Anhydro penicillin derivatives
US4876338A (en) * 1986-07-21 1989-10-24 Schering Corporation Synthesis of azetidinones using CuCl
GB9103034D0 (en) * 1991-02-13 1991-03-27 Fujisawa Pharmaceutical Co Processes for preparing carbapenem derivatives
EP2477993B1 (de) 2009-09-15 2015-06-24 Nabriva Therapeutics AG Substituierte clavulansäure
JP2016069346A (ja) * 2014-09-30 2016-05-09 株式会社日本触媒 チオール化合物
CN110062760A (zh) * 2016-10-10 2019-07-26 约翰霍普金斯大学 抗d,d-转肽酶和l,d-转肽酶的抗细菌剂

Family Cites Families (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL178005C (nl) 1972-11-06 1986-01-02 Merck & Co Inc Werkwijze voor het bereiden van een farmaceutisch preparaat met antibacteriele werking, alsmede werkwijze ter bereiding van een cefalosporine-antibioticum.
US4293599A (en) * 1974-10-29 1981-10-06 Nippon Paint Co., Ltd. Method of forming decorative relief pattern and pattern-forming device therefor
US4172899A (en) * 1975-12-09 1979-10-30 Microlife Technics, Inc. Preparation of creamed cottage cheese with a Streptococcus diacetilactis mutant
GB1591438A (en) 1976-09-09 1981-06-24 Glaxo Lab Ltd Clavem derivatives
US4234596A (en) * 1976-11-19 1980-11-18 Merck & Co., Inc. 3-(2-Aminoethylthio)-6-(1-hydroxyethyl)-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid
US4172895A (en) * 1977-12-28 1979-10-30 Merck & Co., Inc. 6-(1'-Hydroxyethyl)-2-aminoethylthio-oxapen-2-em-3-carboxylic acid
EP0003960B1 (de) * 1978-02-02 1983-06-29 Ciba-Geigy Ag 6-Substituierte Thia-Azaverbindungen, ihre Herstellung und diese enthaltende pharmazeutische Präparate
EP0004132A1 (en) * 1978-03-04 1979-09-19 Beecham Group Plc Esters of beta-lactam antibiotics, a process for their preparation pharmaceutical compositions containing them and the compounds for use as antibacterial agents
US4203902A (en) * 1978-04-21 1980-05-20 Merck & Co., Inc. Process for preparing 6- and 2-substituted-1-carbadethiapen-2-em-3-carboxylic acids
US4217453A (en) * 1978-07-24 1980-08-12 Merck & Co., Inc. 6-Amido-3-substituted-amino-1-azabicyclo[3.2.0]hept-2-en-7-one-2-carboxylic acid
JPS5559193A (en) * 1978-09-20 1980-05-02 Glaxo Group Ltd Bblactam compound
US4206219A (en) * 1978-10-24 1980-06-03 Merck & Co., Inc. 6- and 1-Substituted-1-carbadethiapen-2-em-3-carboxylic acid
IL59081A0 (en) * 1979-01-10 1980-05-30 Schering Corp 2-penem compounds and a method for preparing them
US4314942A (en) * 1979-01-10 1982-02-09 Schering Corporation Deprotection of allylic esters, carbonates and carbamates catalyzed by palladium compounds
NO155548C (no) * 1979-02-10 1987-04-15 Kyowa Hakko Kogyo Kk Fremgangsmaate til fremstilling av optisk aktive cefalosporin-analoger.
GB2042508B (en) * 1979-02-14 1983-02-23 Beecham Group Ltd 3-alkoxy-penem derivatives
GB2045236A (en) * 1979-03-26 1980-10-29 Hoechst Uk Ltd Oxapenem derivatives
GB2046746B (en) 1979-03-26 1983-05-18 Hoechst Uk Ltd Production of polycyclic beta -lactams by the cyclisation of sulphides
GB2045235A (en) 1979-03-26 1980-10-29 Hoechst Uk Ltd Cyclisation of sulphides
US4269771A (en) * 1979-04-06 1981-05-26 Farmitalia Carlo Erba Total synthesis of 7-oxo-4-thia-1-azabicyclo-[3,2,0]-heptane-2-carboxyl derivatives useful as β-lactamase inhibitors and antibacterial agents
DE3069832D1 (en) * 1979-09-13 1985-01-31 Kyowa Hakko Kogyo Kk Acylated cephalosporin analogs, process for their preparation and pharmaceutical compositions comprising them
EP0031509B1 (en) 1979-12-20 1984-10-24 Hoechst Uk Limited Penem derivatives
ATE12773T1 (de) * 1980-02-28 1985-05-15 Schering Corp 2-penem-verbindungen, sie enthaltende pharmazeutische zusammensetzungen und verfahren zu ihrer herstellung.
JPS579784A (en) * 1980-06-23 1982-01-19 Sankyo Co Ltd Production of penem-3-carboxylic derivative

Also Published As

Publication number Publication date
NO159795B (no) 1988-10-31
IL64905A0 (en) 1982-04-30
US4347183A (en) 1982-08-31
DK160877B (da) 1991-04-29
NO820264L (no) 1982-08-03
HU189559B (en) 1986-07-28
ATE21699T1 (de) 1986-09-15
AU7991782A (en) 1982-08-12
PT74356B (en) 1984-05-30
PT74356A (en) 1982-02-01
EP0058317A1 (en) 1982-08-25
IE54214B1 (en) 1989-07-19
DE3272792D1 (en) 1986-10-02
DK160877C (da) 1991-10-14
EP0058317B1 (en) 1986-08-27
FI74966C (fi) 1988-04-11
KR830009107A (ko) 1983-12-17
DK38982A (da) 1982-08-03
AU557691B2 (en) 1987-01-08
ZA82567B (en) 1983-01-26
KR880001774B1 (ko) 1988-09-15
NO159795C (no) 1989-02-08
FI74966B (fi) 1987-12-31
IE820211L (en) 1982-08-02
IL64905A (en) 1986-04-29
FI820281L (fi) 1982-08-03
EP0162193A1 (en) 1985-11-27
JPS57146777A (en) 1982-09-10
NZ199599A (en) 1985-11-08

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