EP0394243A1 - Procede pour fabriquer des acides carboxyliques - Google Patents

Procede pour fabriquer des acides carboxyliques

Info

Publication number
EP0394243A1
EP0394243A1 EP19880904949 EP88904949A EP0394243A1 EP 0394243 A1 EP0394243 A1 EP 0394243A1 EP 19880904949 EP19880904949 EP 19880904949 EP 88904949 A EP88904949 A EP 88904949A EP 0394243 A1 EP0394243 A1 EP 0394243A1
Authority
EP
European Patent Office
Prior art keywords
compounds
formula
nitrophenyl
methyl
dichlorophenyl
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP19880904949
Other languages
German (de)
English (en)
Inventor
Bernhard Kohl
Wolf-Rüdiger Ulrich
Dieter Flockerzi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Takeda GmbH
Original Assignee
Byk Gulden Lomberg Chemische Fabrik GmbH
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 Byk Gulden Lomberg Chemische Fabrik GmbH filed Critical Byk Gulden Lomberg Chemische Fabrik GmbH
Publication of EP0394243A1 publication Critical patent/EP0394243A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D401/00—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, at least one ring being a six-membered ring with only one nitrogen atom
    • C07D401/02—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, at least one ring being a six-membered ring with only one nitrogen atom containing two hetero rings
    • C07D401/12—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, at least one ring being a six-membered ring with only one nitrogen atom containing two hetero rings linked by a chain containing hetero atoms as chain links
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D211/00—Heterocyclic compounds containing hydrogenated pyridine rings, not condensed with other rings
    • C07D211/04—Heterocyclic compounds containing hydrogenated pyridine rings, not condensed with other rings with only hydrogen or carbon atoms directly attached to the ring nitrogen atom
    • C07D211/80—Heterocyclic compounds containing hydrogenated pyridine rings, not condensed with other rings with only hydrogen or carbon atoms directly attached to the ring nitrogen atom having two double bonds between ring members or between ring members and non-ring members
    • C07D211/84—Heterocyclic compounds containing hydrogenated pyridine rings, not condensed with other rings with only hydrogen or carbon atoms directly attached to the ring nitrogen atom having two double bonds between ring members or between ring members and non-ring members with hetero atoms or with carbon atoms having three bonds to hetero atoms, with at the most one bond to halogen directly attached to ring carbon atoms
    • C07D211/90—Carbon atoms having three bonds to hetero atoms with at the most one bond to halogen

Definitions

  • the invention relates to a new process for the production of carboxylic acids and the new intermediates required for the process.
  • the carboxylic acids obtainable according to the invention are valuable intermediates for the synthesis of pharmacologically active 1,4-dihydropyridines, which are used in particular in the pharmaceutical industry in the manufacture of pharmaceuticals.
  • the invention relates to a process for the preparation of 1,4-dihydropyridinecarboxylic acids of the formula I. wherein
  • R1 denotes methyl, ethyl, isobutyl or isopropyl
  • Ar is a 2-chlorophenyl, 3-chlorophenyl, 2,3-dichlorophenyl, 2-nitrophenyl,
  • R2 represents hydrogen or a protective group, and their salts.
  • protective group there are primarily those groups which can be introduced easily and in high yields into the precursors on which compound I is based, which do not undergo any side reactions in the further reaction of I and which can be split off again smoothly at the end.
  • preferred protective groups are alkoxymethyl groups and benzyloxymethyl groups, in particular the ethoxymethyl group.
  • the process according to the invention is characterized in that 2-pyridylethyl ester of the formula II wherein Ar, R1 and R2 have the meanings given above and Py represents a 2-pyridyl or 4-pyridyl radical, quaternized on the pyridine nitrogen, cleaves off the vinylpyridinium group and, if desired, then converts the acid obtained into a salt.
  • the quaternization is carried out by reacting the compounds of the formula II with alkylating agents customary for this.
  • alkylating agents customary for this.
  • suitable alkylating agents are 1-4C-alkyl halides, preferably methyl iodide, or benzyl halides, such as benzyl bromide.
  • the reaction with alkylating agent and the subsequent cleavage of the vinylpyridinium group is advantageously carried out in polar, preferably anhydrous solvents, e.g. in alcohols such as methanol or ethanol, or in ketones such as ethyl methyl ketone, isopropyl methyl ketone or preferably in acetone, optionally in the presence of a base, e.g. an alkali carbonate such as potassium carbonate or an organic amine such as the Hunig base.
  • a base e.g. an alkali carbonate such as potassium carbonate or an organic amine such as the Hunig base.
  • the vinylpyridinium group is split off spontaneously at room temperature (if R2 is a suitable protective group), by heating to temperatures above 20 ° C, if necessary up to the boiling point of the solvent used (if R2 is hydrogen), or subsequently using a base , such as Potassium hydroxide.
  • Ar represents 3-nitrophenyl or 2,3-dichlorophenyl
  • R1 means methyl
  • R2 means hydrogen or ethoxymethyl, and their salts.
  • the invention further relates to new compounds of the formula II.
  • R1 denotes methyl, ethyl, isobutyl or isopropyl
  • Ar is a 2-chlorophenyl, 3-chlorophenyl, 2,3-dichlorophenyl, 2-nitrophenyl,
  • R2 represents a protective group and Py represents a 2- or 4-pyridyl radical, and their salts.
  • R2 represents a protective group and X represents a suitable leaving group (escape group).
  • the procedure is expediently such that the compound II is deprotonated in the 1-position and then reacted with the compound III.
  • the deprotonating agents that can be used are those agents for which the acidity of the proton on the nitrogen is high enough to achieve anion formation.
  • metal hydrides in particular sodium hydride, should preferably be mentioned.
  • the deprotonation can also be carried out using alkali metal hydroxides (for example sodium hydroxide or potassium hydroxide) under suitable conditions, preferably in the presence of a phase transfer catalyst.
  • the leaving group X of compound III is a group which is easily split off when III is reacted with the deprotonated II. If the protecting group is an alkoxymethyl group, X is preferably a halogen atom, in particular a chlorine atom.
  • the deprotonation and subsequent introduction of the protective group is carried out in the solvents suitable for the respective deprotonating agent.
  • organometallic compounds or metal hydrides as deprotonating agents, it is advantageous to work in inert, anhydrous solvents.
  • examples are open-chain or cyclic ethers such as diethyl ether, dioxane or, in particular, tetrahydrofuran.
  • the reaction takes place when using organometallic compounds or metal hydrides as deprotonating agents, preferably under mild reaction conditions at room temperature or at temperatures around or below 0 ° C.
  • Working up is preferably carried out under alkaline conditions in water-containing or water-miscible organic solvents until the complete hydrolysis of excess chloromethyl ethyl ether.
  • alkali metal hydroxides are used as deprotonating agents in the presence of a phase transfer catalyst, the reaction (depending on the type of phase transfer catalyst and the base used) takes place in water-containing or anhydrous organic solvents, or in a mixture of water and an organic solvent which is immiscible or hardly miscible with water.
  • water / solvent mixtures are the mixtures of water with chloroform, dichloromethane or benzene.
  • water-containing or water-free solvents are dichloromethane, acetonitrile or acetone.
  • crown ethers such as dibenzo- [18] crown-6, dicyclohexyl- [18] crown-6 and in particular [18] crown-6
  • onium salts such as, for example, tetrabutylammonium bromide or preferably benzyltriethylammonium chloride, may be mentioned as catalysts.
  • the choice of the reaction temperature for the deprotonation under phase transfer catalysis depends on the type of solvent, the bases used and the
  • Mp Means melting point, h stands for hours, Kp. Stands for boiling point, dec. means decomposition.
  • (2-pyridylethyl)] ester is taken up in 400 ml of acetone, 100 g of methyl iodide are added and the mixture is closed and stirred at 20 ° C. for 60 hours. Excess methyl iodide is then distilled off for reuse at normal pressure, 300 ml of water are added dropwise with stirring, the precipitated solid is filtered off and washed well with water. Crude yield 87.0 g (94% of theory). The sand-colored crude product is stirred in 130 ml of ethanol at 50 ° C. for 30 minutes, after cooling in an ice bath, filtered through a suction filter, washed with cold ethanol and dried to constant weight at 40 ° C. in vacuo. 70 g (76%) of the title compound are obtained as a pale yellow solid, mp. 182-183 ° C.
  • chloromethyl ethyl ether is added dropwise until the color lightens from red-orange to yellow. After stirring for 15 minutes, 300 ml of water are added successively and after 20 hours of stirring (see Example 1b) 500 ml of toluene are added dropwise. The phases are separated, the organic phase is washed with water and concentrated in vacuo.
  • the mixture is stirred for a further 10 minutes, diluted with 25 ml of water, stirred vigorously for another 20 minutes, and the pha is separated sen, the organic phase dries over sodium carbonate and crystallizes in the manner described under a).
  • the title compound is obtained as a pale yellow solid.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Plural Heterocyclic Compounds (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)

Abstract

Procédé pour fabriquer des acides carboxyliques de 1,4-dihydropyridine de formule (I), dans laquelle R1, R2 et Ar ont les notations données dans la description.
EP19880904949 1987-05-22 1988-05-19 Procede pour fabriquer des acides carboxyliques Withdrawn EP0394243A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3717205 1987-05-22
DE3717205 1987-05-22

Publications (1)

Publication Number Publication Date
EP0394243A1 true EP0394243A1 (fr) 1990-10-31

Family

ID=6328129

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19880904949 Withdrawn EP0394243A1 (fr) 1987-05-22 1988-05-19 Procede pour fabriquer des acides carboxyliques

Country Status (2)

Country Link
EP (1) EP0394243A1 (fr)
WO (1) WO1988009331A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4342196A1 (de) * 1993-12-10 1995-06-14 Bayer Ag Neue 4-Phenyl-substituierte 1,4-Dihydropyridine
DE4041814A1 (de) * 1990-12-24 1992-07-02 Byk Gulden Lomberg Chem Fab Verfahren zur herstellung von dihydrophyridincarbonsaeuren
EP0511790A1 (fr) * 1991-04-26 1992-11-04 Ajinomoto Co., Inc. Dérivés de 1,4-dihydropyridine utiles contre les cellules tumorales

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2218644C3 (de) * 1972-04-18 1982-08-19 Bayer Ag, 5090 Leverkusen Basische Ester von 1,4-Dihydropyridinen, Verfahren zu ihrer Herstellung sowie ihre Verwendung als Arzneimittel
US4285955A (en) * 1978-10-31 1981-08-25 Bayer Aktiengesellschaft 1,4-Dihydropyridinecarboxylic acids

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8809331A1 *

Also Published As

Publication number Publication date
WO1988009331A1 (fr) 1988-12-01

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