ZA82567B - Process for the preparation of 2-penem compounds,novel 2-penem compounds produced thereby,and pharmaceutical compositions containing them - Google Patents

Process for the preparation of 2-penem compounds,novel 2-penem compounds produced thereby,and pharmaceutical compositions containing them

Info

Publication number
ZA82567B
ZA82567B ZA82567A ZA82567A ZA82567B ZA 82567 B ZA82567 B ZA 82567B ZA 82567 A ZA82567 A ZA 82567A ZA 82567 A ZA82567 A ZA 82567A ZA 82567 B ZA82567 B ZA 82567B
Authority
ZA
South Africa
Prior art keywords
penem compounds
preparation
pharmaceutical compositions
novel
compositions containing
Prior art date
Application number
ZA82567A
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 ZA82567B publication Critical patent/ZA82567B/xx

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)
  • Pharmacology & Pharmacy (AREA)
  • General Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Veterinary Medicine (AREA)
  • Oncology (AREA)
  • Animal Behavior & Ethology (AREA)
  • Communicable Diseases (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Medicinal Chemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
  • Nitrogen Condensed Heterocyclic Rings (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Plural Heterocyclic Compounds (AREA)
  • Acyclic And Carbocyclic Compounds In Medicinal Compositions (AREA)
  • Nitrogen And Oxygen Or Sulfur-Condensed Heterocyclic Ring Systems (AREA)
ZA82567A 1981-02-02 1982-01-28 Process for the preparation of 2-penem compounds,novel 2-penem compounds produced thereby,and pharmaceutical compositions containing them ZA82567B (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
ZA82567B true ZA82567B (en) 1983-01-26

Family

ID=22866531

Family Applications (1)

Application Number Title Priority Date Filing Date
ZA82567A ZA82567B (en) 1981-02-02 1982-01-28 Process for the preparation of 2-penem compounds,novel 2-penem compounds produced thereby,and pharmaceutical compositions containing them

Country Status (17)

Country Link
US (1) US4347183A (fi)
EP (2) EP0058317B1 (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
CH651037A5 (de) * 1980-06-06 1985-08-30 Sankyo Co Penem-3-carbonsaeurederivate und verfahren zu deren herstellung.
EP0046363B1 (en) * 1980-08-16 1984-11-14 Beecham Group Plc Process for the preparation of 2-thio penem derivatives and intermediates therefor
ES513672A0 (es) * 1981-07-08 1983-04-01 Hoechst Uk Ltd "procedimiento para la preparacion de derivados de penem".
EP0185651A1 (en) * 1981-07-08 1986-06-25 Hoechst Uk Limited Intermediates for the production of antibacterial penem derivates
US4552873A (en) * 1981-08-19 1985-11-12 Sankyo Company Limited Carbapenem compounds, and compositions containing them
ATE35270T1 (de) * 1982-07-08 1988-07-15 Hoechst Uk Ltd Antibakterielle penem-derivate.
KR900006449B1 (ko) * 1982-08-24 1990-08-31 상꾜 가부시끼가이샤 아제티디논 화합물의 제조방법
DE3366926D1 (en) * 1982-11-16 1986-11-20 Schering Corp Penems, pharmaceutical compositions containing them, process for preparing them
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
EP0345827A1 (en) * 1982-11-29 1989-12-13 Schering Corporation Process for the production of penem compounds
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
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
US4595539A (en) * 1983-06-10 1986-06-17 Pfizer Inc. Preparation of penem derivatives and azetidinone intermediates
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
US4833167A (en) * 1985-06-10 1989-05-23 Merck & Co., Inc. 2-aza-substituted 1-carbadethiapen-2-em-3-carboxylic acids
US4782051A (en) * 1985-06-10 1988-11-01 Merck & Co., Inc. 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
US5140030A (en) * 1985-06-10 1992-08-18 Merck 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
EP0215739B1 (de) * 1985-09-11 1993-09-01 Ciba-Geigy Ag Synthese von Beta-Lactamverbindungen
US5215997A (en) * 1985-09-11 1993-06-01 Ciba-Geigy Corporation Synthesis of beta-lactam compounds
ES2029794T3 (es) * 1985-10-17 1992-10-01 Pfizer Inc. Procedimiento de preparacion de antibioticos de 2-(1-oxo-3-tiolanil)-2-penem.
US4876338A (en) * 1986-07-21 1989-10-24 Schering Corporation Synthesis of azetidinones using CuCl
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
US5075438A (en) * 1986-07-21 1991-12-24 Schering Corporation Synthesis of azetidinones
GB9103034D0 (en) * 1991-02-13 1991-03-27 Fujisawa Pharmaceutical Co Processes for preparing carbapenem derivatives
US9120808B2 (en) 2009-09-15 2015-09-01 Nabriva Therapeutics Ag Substituted clavulanic acid
JP2016069346A (ja) * 2014-09-30 2016-05-09 株式会社日本触媒 チオール化合物
US11084833B2 (en) 2016-10-10 2021-08-10 The Johns Hopkins University Antibacterial agents against D,D- and L,D-transpeptidases

Family Cites Families (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
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
EP0042026B1 (de) * 1978-02-02 1986-01-08 Ciba-Geigy Ag 3,4-Disubstituierte Azetidin-2-onverbindungen und Verfahren zu ihrer Herstellung
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
US4314942A (en) * 1979-01-10 1982-02-09 Schering Corporation Deprotection of allylic esters, carbonates and carbamates catalyzed by palladium compounds
IL59081A0 (en) * 1979-01-10 1980-05-30 Schering Corp 2-penem compounds and a method for preparing them
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
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
EP0035188B1 (en) * 1980-02-28 1985-04-17 Schering Corporation 2-penem compounds, pharmaceutical compositions containing them and methods for their preparation
JPS579784A (en) * 1980-06-23 1982-01-19 Sankyo Co Ltd Production of penem-3-carboxylic derivative

Also Published As

Publication number Publication date
IE54214B1 (en) 1989-07-19
EP0058317A1 (en) 1982-08-25
US4347183A (en) 1982-08-31
NO159795B (no) 1988-10-31
AU7991782A (en) 1982-08-12
IL64905A0 (en) 1982-04-30
PH21195A (en) 1987-08-19
DK160877C (da) 1991-10-14
HU189559B (en) 1986-07-28
FI820281L (fi) 1982-08-03
EP0058317B1 (en) 1986-08-27
DE3272792D1 (en) 1986-10-02
ATE21699T1 (de) 1986-09-15
IE820211L (en) 1982-08-02
EP0162193A1 (en) 1985-11-27
NO159795C (no) 1989-02-08
NZ199599A (en) 1985-11-08
KR830009107A (ko) 1983-12-17
PT74356A (en) 1982-02-01
PT74356B (en) 1984-05-30
JPS57146777A (en) 1982-09-10
DK38982A (da) 1982-08-03
IL64905A (en) 1986-04-29
FI74966C (fi) 1988-04-11
FI74966B (fi) 1987-12-31
AU557691B2 (en) 1987-01-08
KR880001774B1 (ko) 1988-09-15
DK160877B (da) 1991-04-29
NO820264L (no) 1982-08-03

Similar Documents

Publication Publication Date Title
DE3272792D1 (en) Process for the preparation of 2-penem compounds
ES483767A1 (es) Procedimiento para producir n-arilsulfonil-l-argininamidas
ES8400422A1 (es) "procedimiento de preparacion de eteres triciclicos, asi como de sus sales de adicion con un acido mineral u organico terapeuticamente compatible".
ES8503667A1 (es) Un procedimiento para la preparacion de nuevos derivados de 2-oxo-imidazolina.
ES482918A1 (es) Procedimiento para la preparacion de derivados de indanilo
IE872588L (en) Compounds
ES8507090A1 (es) Procedimiento para la obtencion de nuevas 1, 5-benzotiacepinas
ES482472A1 (es) Procedimiento para la preparacion de isoquinoleinas.
ES8505518A1 (es) Procedimiento para preparar derivados de aminoacidos
ES478871A1 (es) Un procedimiento de preparacion de 2,6-dialcoxibenzamidas.
DE3170937D1 (en) 2-(1,4-benzodioxan-2-ylalkyl) imidazoles, their preparation and pharmaceutical compositions containing them
NO873564D0 (no) Nye tyroninderivater.
DE3260303D1 (en) Process for the preparation of 4-quinolinones
ES8801805A1 (es) Procedimiento para la obtencion de nuevos derivados de isoxazol
ES8400406A1 (es) Procedimiento para preparar derivados de indano.
DE3166665D1 (en) Dibenzocycloheptenylidenes and their use in pharmaceutical compositions
ES8403891A1 (es) Un procedimiento para la preparacion de un derivado del acido furiloxazolila-cetico
ES8407482A1 (es) Un procedimiento para la preparacion de nuevos derivados de acidos alquiloxazolilaceticos.
ES478361A1 (es) Un procedimiento para la produccion de compuestos que poseenactividad farmacologica como relajadores de los musculos.
ES8300709A1 (es) Un metodo para la preparacion de derivados de pirazolidinona
ES8307812A1 (es) Un procedimiento para la preparacion de nuevos amidin derivados del acido clavulawilo.
ES8304540A1 (es) Un procedimiento para producir una nueva carboxiamidoamina-sustituida.
ES8403471A1 (es) Un procedimiento para preparar nuevos compuestos de cromanona.