EP1663968A1 - Procede de preparation de levetiracetam pur - Google Patents

Procede de preparation de levetiracetam pur

Info

Publication number
EP1663968A1
EP1663968A1 EP04769257A EP04769257A EP1663968A1 EP 1663968 A1 EP1663968 A1 EP 1663968A1 EP 04769257 A EP04769257 A EP 04769257A EP 04769257 A EP04769257 A EP 04769257A EP 1663968 A1 EP1663968 A1 EP 1663968A1
Authority
EP
European Patent Office
Prior art keywords
solvent
levetiracetam
ether
under vacuum
pure
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Withdrawn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
EP04769257A
Other languages
German (de)
English (en)
Inventor
Yatendra Kumar
Mohan Prasad
Kaptan Flat No. B-02 Saket Enclave SINGH
Surender Kumar Dhingra
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.)
Ranbaxy Laboratories Ltd
Original Assignee
Ranbaxy Laboratories Ltd
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 Ranbaxy Laboratories Ltd filed Critical Ranbaxy Laboratories Ltd
Publication of EP1663968A1 publication Critical patent/EP1663968A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D207/00—Heterocyclic compounds containing five-membered rings not condensed with other rings, with one nitrogen atom as the only ring hetero atom
    • C07D207/02—Heterocyclic compounds containing five-membered rings not condensed with other rings, with one nitrogen atom as the only ring hetero atom with only hydrogen or carbon atoms directly attached to the ring nitrogen atom
    • C07D207/18—Heterocyclic compounds containing five-membered rings not condensed with other rings, with one nitrogen atom as the only ring hetero atom with only hydrogen or carbon atoms directly attached to the ring nitrogen atom having one double bond between ring members or between a ring member and a non-ring member
    • C07D207/22—Heterocyclic compounds containing five-membered rings not condensed with other rings, with one nitrogen atom as the only ring hetero atom with only hydrogen or carbon atoms directly attached to the ring nitrogen atom having one double bond between ring members or between a ring member and a non-ring member with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms
    • C07D207/24—Oxygen or sulfur atoms
    • C07D207/26—2-Pyrrolidones
    • C07D207/263—2-Pyrrolidones with only hydrogen atoms or radicals containing only hydrogen and carbon atoms directly attached to other ring carbon atoms
    • C07D207/27—2-Pyrrolidones with only hydrogen atoms or radicals containing only hydrogen and carbon atoms directly attached to other ring carbon atoms with substituted hydrocarbon radicals directly attached to the ring nitrogen atom
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K31/00—Medicinal preparations containing organic active ingredients
    • A61K31/33—Heterocyclic compounds
    • A61K31/395—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins
    • A61K31/40—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having five-membered rings with one nitrogen as the only ring hetero atom, e.g. sulpiride, succinimide, tolmetin, buflomedil
    • A61K31/4015—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having five-membered rings with one nitrogen as the only ring hetero atom, e.g. sulpiride, succinimide, tolmetin, buflomedil having oxo groups directly attached to the heterocyclic ring, e.g. piracetam, ethosuximide
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P25/00—Drugs for disorders of the nervous system
    • A61P25/08—Antiepileptics; Anticonvulsants

Definitions

  • levetiracetam is (S)-alpha-ethyl-2-oxo-l-pyrrolidineacetamide and is known from U.S. Patent No. 4,943,639.
  • Levetiracetam is used as a protective agent for the treatment and prevention of hypoxic and ischemic type aggressions of the central nervous system. It is also effective in the treatment of epilepsy.
  • 4,943,639 discloses the preparation of levetiracetam by reacting (S)-alpha-ethyl-2-oxo-l-pyrrolidineacetic acid successively with alkylhaloformate and with ammonia.
  • (S)-alpha-ethyl-2-oxo-l-pyrroiidineacetic acid in turn was obtained by the chemical resolution of racemic ( ⁇ )-alpha-ethyl-2-oxo- 1 - pyrrolidineacetic acid.
  • 6,107,492 and 6,124,473 describe the preparation of levetiracetam by optical resolution of the racemic mixture of alpha- ethyl-2-oxo-l-pyrrolidineacetamide through simulated mobile bed chromatography or preparative high performance liquid chromatography.
  • WO 01/64637 discloses the preparation of levetiracetam by asymmetric hydrogenation of (Z) or (E)-2-(2- oxotetrahydro-lH-l-pyrrolyl)-2-butenamide, using a chiral catalyst. Summary of the Invention In one aspect there is provided a process for preparing pure levetiracetam having optical purity more than 99.5%.
  • the process includes obtaining a solution of crude levetiracetam in one or more solvents; removing undissolved material; and recovering the pure levetiracetam having optical purity more than 99.5% from the solution thereof by the removal of the solvent.
  • the solvent may be one or more of ketone, nitrile, hydrocarbon, chlorinated hydrocarbon, ether, cyclic ether or mixtures thereof.
  • the ketone may include one or more of acetone, methyl ethyl ketone and methyl isobutyl ketone.
  • the nitrile may include acetonitrile.
  • the hydrocarbon may include toluene.
  • the chlorinated hydrocarbon may include one or more of methylene chloride and ethylene dichloride.
  • the ether may include one or more of diethyl ether and diisopropyl ether.
  • the cyclic ether may include dioxane and tetrahydrofuran.
  • Removing the solvent may include one or more of distillation, distillation under vacuum, filtration, filtration under vacuum, evaporation, decantation and centrifugation. The process may include further drying of the product obtained.
  • additional/second solvent may be added to residue obtained after removal of the solvent and it may be cooled before filtration to obtain better yields of the pure levetiracetam.
  • additional/second solvent examples include esters such as ethyl acetate, isobutyl acetate and isopropyl acetate; hydrocarbons such as hexane, cyclohexane, toluene and heptane; lower alkyl ethers such as diethyl ether, diisopropyl ether and mixtures thereof.
  • the process may produce the pure levetiracetam having optical purity more than 99.5%. In particular, it may produce the pure levetiracetam having optical purity more than 99.8%.
  • a pharmaceutical composition that includes a therapeutically effective amount of pure levetiracetam having optical purity more than 99.5%; and one or more pharmaceutically acceptable carriers, excipients or diluents.
  • the inventors also have developed pharmaceutical compositions that contain the pure levetiracetam having optical purity more than 99.5% for example, more than 99.8%, in admixture with one or more solid or liquid pharmaceutical diluents, carriers, and/or excipients.
  • the levetiracetam may be prepared by the methods known in the literature. In particular, it may be prepared using the reactions and techniques described in U.S. Patent No. 4,943,639; PCT patent application WO 01/64637; and British patent GB 2225322.
  • the term "crude levetiracetam” includes levetiracetam having optical purity of not less than 90%. In general, the solution of crude levetiracetam may be obtained by dissolving crude levetiracetam in a suitable solvent.
  • such a solution may be obtained directly from a reaction in which levetiracetam is formed.
  • the solvent containing crude levetiracetam may be heated to obtain a solution. It can be heated from about 30°C to about reflux temperature of the solvent used, for example from about 30°C to about 100°C.
  • the term "obtaining” includes dissolving, slurrying, stirring or a combination thereof.
  • the pure levetiracetam may be recovered from the solution by a technique which includes, for example, distillation, distillation under vacuum, filtration, filtration under vacuum, evaporation, decantation, and centrifugation.
  • suitable solvent includes any solvent or solvent mixture in which crude levetiracetam is soluble, including, for example, ketone, nitrile, hydrocarbon, chlorinated hydrocarbon and mixtures thereof.
  • a suitable ketone includes one or more of acetone, methyl ethyl ketone and methyl isobutyl ketone.
  • nitrile include acetonitrile.
  • hydrocarbon include toluene and examples of chlorinated hydrocarbons include one or more of methylene chloride and ethylene dichloride.
  • ethers include solvents such as diethyl ether and diisopropyl ether and cyclic ethers such as dioxane, tetrahydrofuran.
  • the undissolved material may be removed by a technique which includes filtration, filtration under vacuum, centrifugation, and decantation. In general, after removing the undissolved material, the resulting solution may be cooled before recovering the pure levetiracetam. The solution may also be concentrated before cooling. Additional or second solvent may be added to residue obtained after concentration and it may be cooled before filtration to obtain better yields of the pure levetiracetam.
  • additional/second solvent examples include esters such as ethyl acetate, isobutyl acetate and isopropyl acetate; hydrocarbons such as hexane, cyclohexane, toluene and heptane; lower alkyl ethers such as diethyl ether, diisopropyl ether and mixtures thereof.
  • Example 1 Preparation of pure levetiracetam Crude levetiracetam (123g, optical purity ⁇ 96.00%) was mixed with acetone (2800ml) and stirred at ambient temperature for 60 minutes. The undissolved material was then filtered through hyflo bed and washed with acetone (200ml). The filtrate and washings were combined and concentrated under vacuum at 35 to 40°C to about 240ml of the volume. To the resulting slurry, ethyl acetate (480ml) was charged and stirred for 20 minutes at ambient temperature. The solid so obtained was filtered and washed with ethyl acetate (100ml). It was dried under vacuum at 40 to 45°C till loss on drying was less than 0.5% to give the pure product. Yield: 108g
  • Example 2 Preparation of pure levetiracetam Crude levetiracetam (lOOg, optical purity ⁇ 98.48%) was mixed with acetone (2300ml) and stirred at ambient temperature for 60 minutes. The undissolved material was then filtered through hyflo bed and washed with acetone (160ml). The filtrate and washings were combined and concentrated under vacuum at 35 to 40°C to about 200ml. Ethyl acetate (200ml) was then charged into the resulting slurry and stirred for 20 minutes at ambient temperature. The solid so obtained was filtered and washed with ethyl acetate (400ml). The wet solid product was dried under vacuum at 40 to 45°C till loss on drying was less than 0.5% to give the pure product. Yield: 87g
  • Example 3 Preparation of pure levetiracetam Crude levetiracetam (36g, optical purity ⁇ 96.00%) was mixed with acetone

Landscapes

  • Health & Medical Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Animal Behavior & Ethology (AREA)
  • Medicinal Chemistry (AREA)
  • Veterinary Medicine (AREA)
  • Public Health (AREA)
  • General Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Pharmacology & Pharmacy (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Engineering & Computer Science (AREA)
  • General Chemical & Material Sciences (AREA)
  • Biomedical Technology (AREA)
  • Pain & Pain Management (AREA)
  • Bioinformatics & Cheminformatics (AREA)
  • Neurosurgery (AREA)
  • Neurology (AREA)
  • Epidemiology (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)

Abstract

L'invention concerne des procédés de préparation de lévétiracétam pur, ainsi que des compositions pharmaceutiques contenant du lévétiracétam pur.
EP04769257A 2003-09-05 2004-09-02 Procede de preparation de levetiracetam pur Withdrawn EP1663968A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IN1108DE2003 2003-09-05
PCT/IB2004/002850 WO2005023763A1 (fr) 2003-09-05 2004-09-02 Procede de preparation de levetiracetam pur

Publications (1)

Publication Number Publication Date
EP1663968A1 true EP1663968A1 (fr) 2006-06-07

Family

ID=34259942

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04769257A Withdrawn EP1663968A1 (fr) 2003-09-05 2004-09-02 Procede de preparation de levetiracetam pur

Country Status (2)

Country Link
EP (1) EP1663968A1 (fr)
WO (1) WO2005023763A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007080470A2 (fr) * 2006-01-16 2007-07-19 Orchid Chemicals & Pharmaceuticals Limited Procede de purification de levetiracetame
JP2009524658A (ja) * 2006-01-24 2009-07-02 テバ ファーマシューティカル インダストリーズ リミティド レベチラセタム製剤、及びそれらの製造方法
WO2009057137A2 (fr) * 2007-08-22 2009-05-07 Alembic Limited Procédé de purification du lévétiracétam
CN103922988A (zh) * 2014-04-29 2014-07-16 苏州天马精细化学品股份有限公司 一种左乙拉西坦粗品的纯化方法
CN108329247A (zh) * 2018-02-10 2018-07-27 浙江华海药业股份有限公司 一种小颗粒度左乙拉西坦的制备方法

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8412357D0 (en) * 1984-05-15 1984-06-20 Ucb Sa Pharmaceutical composition
GB0004297D0 (en) * 2000-02-23 2000-04-12 Ucb Sa 2-oxo-1 pyrrolidine derivatives process for preparing them and their uses
IL160045A0 (en) * 2001-08-10 2004-06-20 Ucb Sa Oxopyrrolidine compounds, preparation of said compounds and their use in the manufacturing of levetiracetam and analogues
CN1802352A (zh) * 2003-02-03 2006-07-12 特瓦制药工业有限公司 制备左乙拉西坦的方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2005023763A1 *

Also Published As

Publication number Publication date
WO2005023763A1 (fr) 2005-03-17

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