WO2009138993A1 - A process for preparation of montelukast sodium salt - Google Patents

A process for preparation of montelukast sodium salt Download PDF

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Publication number
WO2009138993A1
WO2009138993A1 PCT/IN2008/000299 IN2008000299W WO2009138993A1 WO 2009138993 A1 WO2009138993 A1 WO 2009138993A1 IN 2008000299 W IN2008000299 W IN 2008000299W WO 2009138993 A1 WO2009138993 A1 WO 2009138993A1
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Prior art keywords
formula
compound
phenyl
chloro
propanol
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PCT/IN2008/000299
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French (fr)
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Rajendra Murlidhar Agarwal
Shekhar Bhaskar Bhirud
Bijukumar Gopinathan Pillai
Gopal Dnyandev Khude
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Macleods Pharmaceuticals Limited
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Priority to PCT/IN2008/000299 priority Critical patent/WO2009138993A1/en
Publication of WO2009138993A1 publication Critical patent/WO2009138993A1/en

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    • CCHEMISTRY; METALLURGY
    • C07ORGANIC CHEMISTRY
    • C07DHETEROCYCLIC COMPOUNDS
    • C07D215/00Heterocyclic compounds containing quinoline or hydrogenated quinoline ring systems
    • C07D215/02Heterocyclic compounds containing quinoline or hydrogenated quinoline ring systems having no bond between the ring nitrogen atom and a non-ring member or having only hydrogen atoms or carbon atoms directly attached to the ring nitrogen atom
    • C07D215/16Heterocyclic compounds containing quinoline or hydrogenated quinoline ring systems having no bond between the ring nitrogen atom and a non-ring member or having only hydrogen atoms or carbon atoms directly attached to the ring nitrogen atom 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
    • C07D215/18Halogen atoms or nitro radicals
    • CCHEMISTRY; METALLURGY
    • C07ORGANIC CHEMISTRY
    • C07FACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
    • C07F9/00Compounds containing elements of Groups 5 or 15 of the Periodic Table
    • C07F9/02Phosphorus compounds
    • C07F9/547Heterocyclic compounds, e.g. containing phosphorus as a ring hetero atom
    • C07F9/553Heterocyclic compounds, e.g. containing phosphorus as a ring hetero atom having one nitrogen atom as the only ring hetero atom
    • C07F9/576Six-membered rings
    • C07F9/60Quinoline or hydrogenated quinoline ring systems

Definitions

  • the present invention relates to a process for the preparation of montelukast sodium salt.
  • the process includes (a) reacting 2-(2-(3-(S)-(3-(7-chloro-2-quinolinyl)-ethenyl) phenyl)-3-hydroxypropyl)- phenyl-2-propanol of Formula II with diphenyl chloro phosphate to get a compound of Formula III; (b) condensing the compound of Formula III with a compound of Formula IV to get a compound of Formula V; (c) and converting the compound of Formula V to montelukast sodium of Formula I.
  • montelukast sodium is sodium [R- (E)]-l-[[[l-[3-[2-(7-chloro-2- quinolinyl) ethenyl] phenyl]-3-[2-(l -hydroxy- 1-methylethyl) phenyl] propyl] thio] methyl] cyclopropaneacetate having the structural Formula I and is known from U.S. Patent No. 5,565,473.
  • Montelukast sodium is a leukotriene antagonist and is thus useful as an antiasthmatic, anti-allergic, anti-inflammatory and cytoprotective agent.
  • Montelukast sodium is currently indicated for the treatment of asthma and allergic rhinitis.
  • 5,565,473 discloses a process for preparing montelukast sodium by reacting 2-(2-(2-(3 (S)-(3-(2-(7-chloro-2-quinolinyl)-ethenyl) phenyl)-3- (methanesulfonyloxy) propyl) phenyl)-2-propoxy) tetra hydro pyran with methyl 1- (acetylthiomethyl) cyclopropane acetate in presence of hydrazine, cesium carbonate in acetonitrile as solvent to get methyl ester of montelukast in pyran protected form, which is further reacted with pyridinium p-toluene sulfonate, sodium hydroxide in a mixture of methanol and tetrahydrofuran as a solvent to afford montelukast sodium of Formula (I).
  • U.S. Patent No. 5,614,632 discloses a process for preparing montelukast sodium by reacting dilithium dianion of l-(mercaptomethyl) cyclopropaneacetic acid with 2-(2- (3 (S)-(3-(2-(7-chloro-2-quinolinyl) ethenyl) phenyl)-3-methanesulfonyloxypropyl) phenyl)-2-propanol compound to afford montelukast. It is further converted to its corresponding sodium salt via dicyclohexyl amine salt.
  • U.S. Patent application US 20050256156 discloses a process for preparing pharmaceutically acceptable salt of montelukast by (a) activating the 2-(2-(3 (S)-(3- (2-(7-chloro-2-quinolinyl) ethenyl) phenyl)-3-(( ⁇ -hydroxy) propyl) phenyl)-2- propanol with a benzylsulfonyl or mesyl group; (b) reacting the product of step a with l-(mercaptomethyl) cyclopropaneacetic acid alkyl ester in a solvent and in the presence of a cosolvent and a base; and (c) hydrolyzing the product of step b to obtain a pharmaceutically acceptable salt of montelukast.
  • U.S. Patent application US 20050234241 discloses a process for preparing montelukast by the mesylation of 2-(2-(3 (S)-(3-(2-(7-chloro-2-quinolinyl) ethenyl) phenyl)-3-hydroxypropyl) phenyl)-2-propanol using methane sulfonyl chloride and condensation of the resulting mesylate with a compound of formula (VI)
  • U.S. Patent application US 20050245569 discloses a process for preparing montelukast sodium by using intermediate compound of Formula VIII.
  • U.S. Patent application US 20050107612 discloses a process for the preparation of montelukast or a salt thereof by reacting 2-[l-[l R-3- [2-(7-chloroquinoline-2-yl) vinyl [phenyl]-3-[2-methoxy carbonyl phenyl] propyl sulfonyl methyl] cyclopropyl] acetic acid or a salt thereof with methyl magnesium chloride or methyl magnesium bromide in an organic solvent.
  • U.S. Patent application US 20060194839 discloses a process for preparing montelukast sodium by using [R- (E)]-2-[3-[3-[2-(7-chloro-2-quinolinyl) ethenyl] phenyl]-3-(2-benzyloxy-methyl) propyl) thiomethyl-cyclopropaneacetic acid intermediate.
  • PCT application WO 2006008751 discloses a process for the preparation of montelukast free acid by reacting methyl 2-[(3S)-[3-[(2E)-(7-chloro quinolin-2-yl) ethenyl] phenyl] -3 -halopropyl] benzoate with l-(mercapto methyl) cyclopropane acetic acid in the presence of alkali hydrides or alkoxides to get 2-[l-[l(R)-[3-[2-(7- chloroquinoline-2-yl) ethenyl] phenyl] -3 -[2-(methoxycarbonyl) phenyl] propyl sulfonyl methyl] cyclopropane acetic acid, which on reaction with grignard reagent yield montelukast free acid.
  • the first aspect of the present invention is to provide a process for the preparation of montelukast sodium salt of Formula I
  • Formula III (b) condensing the compound of Formula III with a compound of Formula IV, wherein R is hydrogen or alkyl or substituted alkyl of Ci to C 4 carbon atoms in straight or branched chain form,
  • the second aspect of the present invention is to provide a compound of Formula III
  • the third aspect of the present invention is to provide a compound of Formula III
  • the 2-(2-(3-(S)-(3-(7-chloro-2-quinolinyl)-ethenyl) phenyl)-3-hydroxypropyl)- phenyl-2-propanol of Formula II may be prepared by any of the methods known in the art including those described in U.S. Patent Nos. 5,565,473; 5,614,632 and WO 95/18107.
  • the 2-(2-(3-(S)-(3-(7-chloro-2-quinolinyl)-ethenyl) phenyl)-3-hydroxypropyl)- phenyl-2-propanol of Formula II may be reacted with diphenyl chloro phosphate to get a compound of Formula III,
  • reaction of 2-(2-(3-(S)-(3-(7-chloro-2-quinolinyl)-ethenyl) phenyl)-3- hydroxypropyl) - phenyl-2-propanol of Formula II with diphenyl chloro phosphate may be carried out in an organic solvent in the presence of base.
  • organic solvent examples include chlorinated hydrocarbons solvent or N, N- dimethylformamide or mixture(s) thereof.
  • chlorinated hydrocarbons solvent examples include dichloromethane, dichloroethane, chloroform, carbon terra chloride or mixture(s) thereof.
  • bases include organic base such as trimethylamine, triethylamine, tributylamine, triisopropylamine, diisopropylethylamine, pyridine, morpholine, DBU (1, 8-diazabicyclo- [5. 4. 0]-undec-7-ene), DBN (1, 5-diazabicyclo- [4.3.0] non-5- ene), 4-dimethylaminopyridine, or mixture(s) thereof.
  • organic base such as trimethylamine, triethylamine, tributylamine, triisopropylamine, diisopropylethylamine, pyridine, morpholine, DBU (1, 8-diazabicyclo- [5. 4. 0]-undec-7-ene), DBN (1, 5-diazabicyclo- [4.3.0] non-5- ene), 4-dimethylaminopyridine, or mixture(s) thereof.
  • the base may be used in an amount of 1.0-6.0 molar equivalents of compound of Formula II.
  • the reaction of 2-(2-(3-(S)-(3-(7-chloro-2-quinolinyl)-ethenyl) phenyl)-3- hydroxypropyl)- phenyl-2-propanol of Formula II with diphenyl chloro phosphate may be carried out at a temperature in the range of -70°C to -10°C for 0.5 hour to 3 hours
  • the 2-(2-(3 (S)-(3-(7-chloro-2-quinolinyl)-ethenyl) phenyl)-3-phosphoryloxypropyl) phenyl-2-propanol of Formula III may be extracted with halogenated hydrocarbons solvent such as dichloromethane, dichloroethane, carbon tetra chloride, or mixture(s) thereof.
  • halogenated hydrocarbons solvent such as dichloromethane, dichloroethane, carbon tetra chloride, or mixture(s) thereof.
  • the 2-(2-(3 (S)-(3-(7-chloro-2-quinolinyl)-ethenyl) phenyl)-3-phosphoryloxypropyl) phenyl-2-propanol of Formula III may be isolated from the organic layer after washing the organic layer with aqueous hydrochloride solution / aqueous sodium bicarbonate solution / sodium chloride solution and concentrating under reduced pressure and stirring with a mixture of alkyl acetate solvents and hydrocarbon solvents or ether solvents at a temperature in the range of 0°C to 30°C.
  • alkyl acetate solvents include methyl acetate, ethyl acetate, n-propyl acetate, isopropyl acetate, butyl acetate, amyl acetate, or mixture(s) thereof.
  • hydrocarbon solvents examples include n-hexane, hexanes, heptanes, toluene, xylene, or mixture(s) thereof.
  • ether solvents include diethyl ether, diisopropyl ether, methyl tert-butyl ether, or mixture(s) thereof.
  • the isolation of compound of Formula III may be accomplished by cooling, filtration or a combination thereof.
  • the compound of Formula III may be dried under reduced pressure at a temperature in the range of 10°C to 30 0 C.
  • the compound of Formula III obtained from step a may be further reacted with a compound of Formula IV in organic solvent in the presence of base at a temperature in the range of 0 0 C to 30 0 C for 3 hours to 24 hours, to get a compound of Formula V;
  • the compound of Formula IV may be prepared by methods known in the art.
  • organic solvent examples include dimethylsulfoxide, N, N-dimethylformamide or tetrahydrofuran.
  • Examples of base include inorganic base or organic base.
  • inorganic base examples include alkali metal carbonate, alkali metal bicarbonate, alkali metal hydroxide, or mixture(s) thereof.
  • alkali metal carbonate examples include lithium carbonate, sodium carbonate or potassium carbonate or cesium carbonate.
  • alkali metal bicarbonate examples include sodium bicarbonate or potassium bicarbonate.
  • alkali metal hydroxide examples include sodium hydroxide or potassium hydroxide.
  • organic base examples include trimethylamine, triethylamine, tributylamine, triisopropylamine, diisopropylethylamine, pyridine, morpholine, DBU (1, 8- diazabicyclo- [5. 4. 0]-undec-7-ene), DBN (1, 5-diazabicyclo- [4.3.0] non-5-ene), 4- dimethylaminopyridine or 1-aminoguanidine bicarbonate.
  • the compound of Formula V may be extracted with alkyl acetate solvents such as methyl acetate, ethyl acetate, n-propyl acetate, isopropyl acetate, butyl acetate or amyl acetate.
  • alkyl acetate solvents such as methyl acetate, ethyl acetate, n-propyl acetate, isopropyl acetate, butyl acetate or amyl acetate.
  • the compound of Formula V may be isolated from the organic layer after washing the organic layer with sodium chloride solution and concentrating under reduced pressure
  • the compound of Formula V may be reacted with alkali metal hydroxide in organic solvent to get montelukast sodium of Formula I.
  • reaction of compound of Formula V with alkali metal hydroxide may be carried out at a temperature in the range of 0 0 C to 3O 0 C for 1 hour to 55 hours.
  • Example of alkali metal hydroxide includes sodium hydroxide.
  • organic solvent examples include methanol, ethanol, n-propanol, iso propanol, butanol, diethyl ether, tetrahydrofuran or mixture(s) thereof.
  • the isolation of montelukast sodium of Formula I may be accomplished by crystallization with hydrocarbon solvents.
  • hydrocarbon solvents examples include hexanes, heptanes, toluene, xylene, acetonitrile or mixture(s) thereof.
  • the isolation of montelukast sodium of Formula I may be accomplished by cooling, filtration or a combination thereof.
  • the montelukast sodium of Formula I may be dried under reduced pressure at a temperature in the range of 25°C to 30 0 C.
  • R is hydrogen or alkyl or substituted alkyl of Ci to C 4 carbon atoms in straight or branched chain form.
  • 1-Aminoguanidine bicarbonate (14.4 gm) and 2-(2-(3 (S)-(3-(7-chloro-2-quinolinyl)- ethenyl) phenyl)-3-phosphoryloxypropyl) phenyl-2-propanol (14 gm) were added to solution of l-(mercaptomethyl) cyclopropane acetic acid (14.4 gm) in tetrahydrofuran (100 ml) at 25°C and resulting reaction mixture was stirred for 2 hours at 40°C to 45 °C. The reaction mixture was treated with sodium chloride solution (5%, 100 ml) and extracted by ethyl acetate (100 ml).
  • Example 6 Preparation of [R- (E)]-l-[[[l-[3-[2-(7-chloro-2-quinolinyl) ethenyl] phenyl]-3-[2-(l-hydroxy-l-methylethyl) phenyl] propyl] thio] methyl] cyclopropaneacetic acid sodium salt Sodium hydroxide (1.2 gm) was added to a solutin of [R- (E)]-l-[[[l-[3-[2-(7-chloro- 2-quinolinyl) ethenyl] phenyl]-3-[2-(l-hydroxy-l-methylethyl) phenyl] propyl] thio] methyl] cyclopropaneacetic acid (7 gm) in methanol ( 42 ml) at 25°C.

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Abstract

The present invention relates to a process for the preparation of montelukast sodium salt. The process includes (a) reacting 2-(2-(3-(S)-(3-(7-chloro-2- quinolinyl)-ethenyl) phenyl)-3-hydroxypropyl)- phenyl-2-propanol of Formula (II) with diphenyl chloro phosphate to get a compound of Formula III; (b) condensing the compound of Formula III with a compound of Formula IV to get compound of Formula V; (c) and converting the compound of Formula V to montelukast sodium of Formula (I).

Description

A PROCESS FOR PREPARATION OF MONTELUKAST SODIUM SALT
Field of The Invention
The present invention relates to a process for the preparation of montelukast sodium salt. The process includes (a) reacting 2-(2-(3-(S)-(3-(7-chloro-2-quinolinyl)-ethenyl) phenyl)-3-hydroxypropyl)- phenyl-2-propanol of Formula II with diphenyl chloro phosphate to get a compound of Formula III; (b) condensing the compound of Formula III with a compound of Formula IV to get a compound of Formula V; (c) and converting the compound of Formula V to montelukast sodium of Formula I.
Background of The Invention
Chemically, montelukast sodium is sodium [R- (E)]-l-[[[l-[3-[2-(7-chloro-2- quinolinyl) ethenyl] phenyl]-3-[2-(l -hydroxy- 1-methylethyl) phenyl] propyl] thio] methyl] cyclopropaneacetate having the structural Formula I and is known from U.S. Patent No. 5,565,473.
Figure imgf000002_0001
Formula I
Montelukast sodium is a leukotriene antagonist and is thus useful as an antiasthmatic, anti-allergic, anti-inflammatory and cytoprotective agent. Montelukast sodium is currently indicated for the treatment of asthma and allergic rhinitis. U.S. Patent No. 5,565,473 discloses a process for preparing montelukast sodium by reacting 2-(2-(2-(3 (S)-(3-(2-(7-chloro-2-quinolinyl)-ethenyl) phenyl)-3- (methanesulfonyloxy) propyl) phenyl)-2-propoxy) tetra hydro pyran with methyl 1- (acetylthiomethyl) cyclopropane acetate in presence of hydrazine, cesium carbonate in acetonitrile as solvent to get methyl ester of montelukast in pyran protected form, which is further reacted with pyridinium p-toluene sulfonate, sodium hydroxide in a mixture of methanol and tetrahydrofuran as a solvent to afford montelukast sodium of Formula (I).
U.S. Patent No. 5,614,632 discloses a process for preparing montelukast sodium by reacting dilithium dianion of l-(mercaptomethyl) cyclopropaneacetic acid with 2-(2- (3 (S)-(3-(2-(7-chloro-2-quinolinyl) ethenyl) phenyl)-3-methanesulfonyloxypropyl) phenyl)-2-propanol compound to afford montelukast. It is further converted to its corresponding sodium salt via dicyclohexyl amine salt.
U.S. Patent application US 20050256156 discloses a process for preparing pharmaceutically acceptable salt of montelukast by (a) activating the 2-(2-(3 (S)-(3- (2-(7-chloro-2-quinolinyl) ethenyl) phenyl)-3-((α-hydroxy) propyl) phenyl)-2- propanol with a benzylsulfonyl or mesyl group; (b) reacting the product of step a with l-(mercaptomethyl) cyclopropaneacetic acid alkyl ester in a solvent and in the presence of a cosolvent and a base; and (c) hydrolyzing the product of step b to obtain a pharmaceutically acceptable salt of montelukast.
U.S. Patent application US 20050234241 discloses a process for preparing montelukast by the mesylation of 2-(2-(3 (S)-(3-(2-(7-chloro-2-quinolinyl) ethenyl) phenyl)-3-hydroxypropyl) phenyl)-2-propanol using methane sulfonyl chloride and condensation of the resulting mesylate with a compound of formula (VI)
Figure imgf000004_0001
Formula VI Formula VII
where X=CN or CONH2 or mixture of compound of formula (VI) wherein X=CN and compound of formula (VI) wherein X=CONH2 to give a compound of formula (VII) where X=CN or CONH2. This compound is hydrolyzed to afford Montelukast, and it is isolated in the form of an amine salt, which is then converted into sodium salt of Montelukast in a conventional method.
U.S. Patent application US 20050245569 discloses a process for preparing montelukast sodium by using intermediate compound of Formula VIII.
Figure imgf000004_0002
Formula VIII
U.S. Patent application US 20050107612 discloses a process for the preparation of montelukast or a salt thereof by reacting 2-[l-[l R-3- [2-(7-chloroquinoline-2-yl) vinyl [phenyl]-3-[2-methoxy carbonyl phenyl] propyl sulfonyl methyl] cyclopropyl] acetic acid or a salt thereof with methyl magnesium chloride or methyl magnesium bromide in an organic solvent.
U.S. Patent application US 20060194839 discloses a process for preparing montelukast sodium by using [R- (E)]-2-[3-[3-[2-(7-chloro-2-quinolinyl) ethenyl] phenyl]-3-(2-benzyloxy-methyl) propyl) thiomethyl-cyclopropaneacetic acid intermediate.
PCT application WO 2006008751 discloses a process for the preparation of montelukast free acid by reacting methyl 2-[(3S)-[3-[(2E)-(7-chloro quinolin-2-yl) ethenyl] phenyl] -3 -halopropyl] benzoate with l-(mercapto methyl) cyclopropane acetic acid in the presence of alkali hydrides or alkoxides to get 2-[l-[l(R)-[3-[2-(7- chloroquinoline-2-yl) ethenyl] phenyl] -3 -[2-(methoxycarbonyl) phenyl] propyl sulfonyl methyl] cyclopropane acetic acid, which on reaction with grignard reagent yield montelukast free acid.
The above prior art procedures involve more number of steps, which include a series of protections and deprotections of diol intermediate, usage of hazardous and costly raw materials such as n-butyl lithium, hydrazine, pyridinium p-toluenesulfonate, grignard reagent. The processes of the prior art references involve tedious workup to isolate the required product and thus results in excess time cycle, which in turn rendering the process more costly and less eco friendly thus the process is not amenable for commercial scale up.
Summary of The Invention
In light of the above drawbacks in the prior art processes, there is a need for the development of a simple, convenient and efficient process for the preparation of montelukast sodium salt, which is convenient to operate on an industrial scale. The first aspect of the present invention is to provide a process for the preparation of montelukast sodium salt of Formula I
Figure imgf000006_0001
Formula I
comprising the steps of:
(a) reacting 2-(2-(3-(S)-(3-(7-chloro-2-quinolinyl)-ethenyl) phenyl)-3- hydroxypropyl)- phenyl-2-propanol of Formula II
Figure imgf000006_0002
Formula II
with diphenyl chloro phosphate to get a compound of Formula III;
Figure imgf000006_0003
Formula III (b) condensing the compound of Formula III with a compound of Formula IV, wherein R is hydrogen or alkyl or substituted alkyl of Ci to C4 carbon atoms in straight or branched chain form,
Figure imgf000007_0001
Formula IV
to get a compound of Formula V;
Figure imgf000007_0002
Formula V
(c) and converting the compound of formula V to montelukast sodium of Formula I.
The second aspect of the present invention is to provide a compound of Formula III
Figure imgf000008_0001
Formula III
The third aspect of the present invention is to provide a compound of Formula III
Figure imgf000008_0002
Formula III used for the preparation of montelukast sodium salt of Formula I
Figure imgf000008_0003
Formula I Detailed Description of the Invention
The 2-(2-(3-(S)-(3-(7-chloro-2-quinolinyl)-ethenyl) phenyl)-3-hydroxypropyl)- phenyl-2-propanol of Formula II may be prepared by any of the methods known in the art including those described in U.S. Patent Nos. 5,565,473; 5,614,632 and WO 95/18107.
The 2-(2-(3-(S)-(3-(7-chloro-2-quinolinyl)-ethenyl) phenyl)-3-hydroxypropyl)- phenyl-2-propanol of Formula II may be reacted with diphenyl chloro phosphate to get a compound of Formula III,
The reaction of 2-(2-(3-(S)-(3-(7-chloro-2-quinolinyl)-ethenyl) phenyl)-3- hydroxypropyl) - phenyl-2-propanol of Formula II with diphenyl chloro phosphate may be carried out in an organic solvent in the presence of base.
Examples of organic solvent include chlorinated hydrocarbons solvent or N, N- dimethylformamide or mixture(s) thereof.
Examples of chlorinated hydrocarbons solvent include dichloromethane, dichloroethane, chloroform, carbon terra chloride or mixture(s) thereof.
Examples of bases include organic base such as trimethylamine, triethylamine, tributylamine, triisopropylamine, diisopropylethylamine, pyridine, morpholine, DBU (1, 8-diazabicyclo- [5. 4. 0]-undec-7-ene), DBN (1, 5-diazabicyclo- [4.3.0] non-5- ene), 4-dimethylaminopyridine, or mixture(s) thereof.
The base may be used in an amount of 1.0-6.0 molar equivalents of compound of Formula II. The reaction of 2-(2-(3-(S)-(3-(7-chloro-2-quinolinyl)-ethenyl) phenyl)-3- hydroxypropyl)- phenyl-2-propanol of Formula II with diphenyl chloro phosphate may be carried out at a temperature in the range of -70°C to -10°C for 0.5 hour to 3 hours
The 2-(2-(3 (S)-(3-(7-chloro-2-quinolinyl)-ethenyl) phenyl)-3-phosphoryloxypropyl) phenyl-2-propanol of Formula III may be extracted with halogenated hydrocarbons solvent such as dichloromethane, dichloroethane, carbon tetra chloride, or mixture(s) thereof.
The 2-(2-(3 (S)-(3-(7-chloro-2-quinolinyl)-ethenyl) phenyl)-3-phosphoryloxypropyl) phenyl-2-propanol of Formula III may be isolated from the organic layer after washing the organic layer with aqueous hydrochloride solution / aqueous sodium bicarbonate solution / sodium chloride solution and concentrating under reduced pressure and stirring with a mixture of alkyl acetate solvents and hydrocarbon solvents or ether solvents at a temperature in the range of 0°C to 30°C.
Examples of alkyl acetate solvents include methyl acetate, ethyl acetate, n-propyl acetate, isopropyl acetate, butyl acetate, amyl acetate, or mixture(s) thereof.
Examples of hydrocarbon solvents include n-hexane, hexanes, heptanes, toluene, xylene, or mixture(s) thereof.
Examples of ether solvents include diethyl ether, diisopropyl ether, methyl tert-butyl ether, or mixture(s) thereof.
The isolation of compound of Formula III may be accomplished by cooling, filtration or a combination thereof. The compound of Formula III may be dried under reduced pressure at a temperature in the range of 10°C to 300C.
The compound of Formula III obtained from step a may be further reacted with a compound of Formula IV in organic solvent in the presence of base at a temperature in the range of 00C to 300C for 3 hours to 24 hours, to get a compound of Formula V;
The compound of Formula IV may be prepared by methods known in the art.
Examples of organic solvent include dimethylsulfoxide, N, N-dimethylformamide or tetrahydrofuran.
Examples of base include inorganic base or organic base.
Examples of inorganic base include alkali metal carbonate, alkali metal bicarbonate, alkali metal hydroxide, or mixture(s) thereof.
Examples of alkali metal carbonate include lithium carbonate, sodium carbonate or potassium carbonate or cesium carbonate.
Examples of alkali metal bicarbonate include sodium bicarbonate or potassium bicarbonate.
Examples of alkali metal hydroxide include sodium hydroxide or potassium hydroxide.
Examples of organic base include trimethylamine, triethylamine, tributylamine, triisopropylamine, diisopropylethylamine, pyridine, morpholine, DBU (1, 8- diazabicyclo- [5. 4. 0]-undec-7-ene), DBN (1, 5-diazabicyclo- [4.3.0] non-5-ene), 4- dimethylaminopyridine or 1-aminoguanidine bicarbonate.
The compound of Formula V may be extracted with alkyl acetate solvents such as methyl acetate, ethyl acetate, n-propyl acetate, isopropyl acetate, butyl acetate or amyl acetate.
The compound of Formula V may be isolated from the organic layer after washing the organic layer with sodium chloride solution and concentrating under reduced pressure
The compound of Formula V may be reacted with alkali metal hydroxide in organic solvent to get montelukast sodium of Formula I.
The reaction of compound of Formula V with alkali metal hydroxide may be carried out at a temperature in the range of 00C to 3O0C for 1 hour to 55 hours.
Example of alkali metal hydroxide includes sodium hydroxide.
Examples of organic solvent include methanol, ethanol, n-propanol, iso propanol, butanol, diethyl ether, tetrahydrofuran or mixture(s) thereof.
The isolation of montelukast sodium of Formula I may be accomplished by crystallization with hydrocarbon solvents.
Examples of hydrocarbon solvents include hexanes, heptanes, toluene, xylene, acetonitrile or mixture(s) thereof. The isolation of montelukast sodium of Formula I may be accomplished by cooling, filtration or a combination thereof.
The montelukast sodium of Formula I may be dried under reduced pressure at a temperature in the range of 25°C to 300C.
The schematic diagram for the process of preparing montelukast sodium of Formula I is provided below:
Diphenyl chloro phosphate
Figure imgf000013_0002
Figure imgf000013_0001
Formula II Formula III
Figure imgf000013_0003
Formula IV
Figure imgf000013_0004
Formula V
Formula I
Wherein R is hydrogen or alkyl or substituted alkyl of Ci to C4 carbon atoms in straight or branched chain form.
The present invention is further illustrated by the following examples which are provided merely to be exemplary of the invention and do not limit the scope of the invention. Certain modifications and equivalents will be apparent to those skilled in the art and are intended to be included within the scope of the present invention.
EXAMPLES:
Example 1: Preparation of methyl ester of l-(mercaptomethyl) cyclopropane acetic acid
Thionyl chloride (7.4 ml) was added to solution of l-(mercaptomethyl) cyclopropane acetic acid (10.0 gm) in methanol (100 ml) at 0-5°C. The reaction mixture thus obtained was stirred at 60-650C for 2 hours and concentrated under reduced pressure^ to get methyl ester of 1 -(mercaptomethyl) cyclopropane acetic acid. Yield: 9.0 gm
Example 2: Preparation of 2-(2-(3 (S)-(3-(7-chloro-2-quinolinyl)-ethenyl) phenyl)-3-phosphoryloxypropyl) phenyl-2-propanol
4-Dimethylaminopyridine (29.3 gm) was added to solution of 2-(2-(3 (S)-(3-(7- chloro-2-quinolinyl)-ethenyl) phenyl)-3-hydroxypropyl) phenyl-2-propanol (50 gm) in dichloromethane (200 ml) and N, N-dimethylformamide (50 ml) at 250C. The resulting reaction mixture was stirred for 30 minutes, cooled to -400C and diphenyl chloro phosphate (37 gm) was added and reaction mixture was further stirred for 2 hours at -250C to -200C. The resulting reaction mixture was treated with water (500 ml) and extracted with dichloromethane (500 ml). The organic layer was washed by aqueous hydrochloride solution (0.5 N, 200 ml), and water (500 ml). The organic layer was dried and concentrated under reduced pressure to get oily residue. The oily residue was dissolved in ethyl acetate (250 ml), diluted with diisopropyl ether (2000 ml) and then stirred for 12 hours at 25-30°C. The resulting solids were filtered and dried at 30°C under reduced pressure to get yellow colored compound. Yield: 51.5 gm
Example 3: Preparation of 2-(2-(3 (S)-(3-(7-chloro-2-quinolinyl)-ethenyl) phenyl)-3-phosphoryloxypropyl) phenyl-2-propanol
4-Dimethylaminopyridine (5.3 gm) was added to solution of 2-(2-(3 (S)-(3-(7-chloro- 2-quinolinyl)-ethenyl) phenyl)-3-hydroxypropyl) phenyl-2-propanol (5 gm) in dichloromethane (50 ml) at 25°C. The resulting reaction mixture was stirred for 30 minutes, cooled to -70°C and diphenyl chloro phosphate (7.5 ml) was added and reaction mixture was further stirred for 2 hours at -65°C to -70°C. The resulting reaction mixture was treated with water (25 ml) and extracted with dichloromethane (20 ml). The organic layer was washed by aqueous hydrochloride solution (0.5 M, 20 ml), sodium bicarbonate solution (5 %, 20 ml) and sodium chloride solution (saturated). The organic layer was dried and concentrated under reduced pressure to get oily residue. The oily residue was dissolved in ethyl acetate (25 ml), diluted with hexane (200 ml) and then stirred for 12 hours at 25-30°C. The resulting solids were filtered and dried at 30°C under reduced pressure to get yellow colored compound. Yield: 7.3 gm
Example 4: Preparation of [R- (E)]-l-[[[l-[3-[2-(7-chloro-2-quinolinyl) ethenyl] phenyl]-3-[2-(l-hydroxy-l-methylethyl) phenyl] propyl] thio] methyl] cyclopropaneacetic acid.
1-Aminoguanidine bicarbonate (14.4 gm) and 2-(2-(3 (S)-(3-(7-chloro-2-quinolinyl)- ethenyl) phenyl)-3-phosphoryloxypropyl) phenyl-2-propanol (14 gm) were added to solution of l-(mercaptomethyl) cyclopropane acetic acid (14.4 gm) in tetrahydrofuran (100 ml) at 25°C and resulting reaction mixture was stirred for 2 hours at 40°C to 45 °C. The reaction mixture was treated with sodium chloride solution (5%, 100 ml) and extracted by ethyl acetate (100 ml). The organic layer was separated and concentrated under reduced pressure to get [R- (E)]-l-[[[l-[3-[2-(7-chloro-2- quinolinyl) ethenyl] phenyl] -3 -[2-(I -hydroxy- 1-methylethyl) phenyl] propyl] thio] methyl] cyclopropaneacetic acid. Yield: 10.8 gm
Example 5: Preparation of [R- (E)]-l-[[[l-[3-[2-(7-chloro-2-quinolinyl) ethenyl] phenyl]-3-[2-(l-hydroxy-l-methylethyl) phenyl] propyl] thio] methyl] cyclopropaneacetic acid methyl ester.
Sodium hydroxide solution (47 %, 1.56 gm) was added to solution of methyl ester of l-(mercaptomethyl) cyclopropane acetic acid (2.97 gm) in N, N-dimethylformamide.. (25 ml) at 25°C under inert atmosphere. The reaction mixture thus obtained was stirred for 30 minutes at 25°C and solution of 2-(2-(3 (S)-(3-(7-chloro-2-quinolinyl)- ethenyl) phenyl)-3-phosphoryloxypropyl) phenyl-2-propanol (25%, 22 ml) in tetrahydrofuran was added and resulting reaction mixture was stirred for 12 hours at 20°C. The reaction mixture was treated with sodium chloride solution (5%, 100 ml) and extracted by ethyl acetate (100 ml). The organic layer was washed two times with, water (50 ml each), dried over sodium sulphate and concentrated under reduced pressure to get [R- (E)]-l-[[[l-[3-[2-(7-chloro-2-quinolinyl) ethenyl] phenyl] -3 -[2-(I- hydroxy- 1-methylethyl) phenyl] propyl] thio] methyl] cyclopropaneacetic acid methyl ester. Yield: 3.0 gm
Example 6: Preparation of [R- (E)]-l-[[[l-[3-[2-(7-chloro-2-quinolinyl) ethenyl] phenyl]-3-[2-(l-hydroxy-l-methylethyl) phenyl] propyl] thio] methyl] cyclopropaneacetic acid sodium salt Sodium hydroxide (1.2 gm) was added to a solutin of [R- (E)]-l-[[[l-[3-[2-(7-chloro- 2-quinolinyl) ethenyl] phenyl]-3-[2-(l-hydroxy-l-methylethyl) phenyl] propyl] thio] methyl] cyclopropaneacetic acid (7 gm) in methanol ( 42 ml) at 25°C. The resulting reaction mixture was stirred 5 hours at 20°C to 25°C and then concentrated under reduced pressure to get slurry. The slurry was treated with acetonitrile (40 ml) to get [R- (E)]-l-[[[l-[3-[2-(7-chloro-2-quinolinyl) ethenyl] phenyl] -3 -[2-(I -hydroxy- 1- methylethyl) phenyl] propyl] thio] methyl] cyclopropaneacetic acid sodium salt. Yield: 6.2 gm
Example 7: Preparation of [R- (E)]-l-[[[l-[3-[2-(7-chloro-2-quinolinyl) ethenyl] phenyl]-3-[2-(l-hydroxy-l-methylethyl) phenyl] propyl] thio] methyl] cyclopropaneacetic acid sodium salt
Sodium hydroxide solution (10 %, 2.5 gm) was added to solution of [R- (E)]-l-[[[l- [3-[2-(7-chloro-2-quinolinyl) ethenyl] phenyl]-3-[2-(l-hydroxy-l-methylethyl) phenyl] propyl] thio] methyl] cyclopropaneacetic acid methyl ester (2.9 gm) in methanol (7.6 ml) at 25-30°C. The resulting turbid solution was diluted with tetrahydrofuran (0.5 ml) and stirred for 50 hours at 25-30°C. The resulting reaction mixture was concentrated under reduced pressure to get oily residue. The residue .was diluted with ethyl acetate (20 ml) and water (10 ml) and organic layer separated. The organic layer was washed by sodium chloride solution (5%, 5 ml) and diluted with heptane (20 ml). The resulting heavy liquid was separated, stripped with ethanol and evaporated to get R- (E)]-l-[[[l-[3-[2-(7-chloro-2-quinolinyl) ethenyl] phenyl]-3-[2- (1 -hydroxy- 1-methylethyl) phenyl] propyl] thio] methyl] cyclopropaneacetic acid sodium salt. Yield: 1.3 gm

Claims

WE CLAIM:
1. A process for the preparation of montelukast sodium salt of Formula I
Figure imgf000018_0001
Formula I comprising the steps of:
(a) reacting 2-(2-(3-(S)-(3-(7-chloro-2-quinolinyl)-ethenyl) phenyl)-3- hydroxypropyl)- phenyl-2-propanol of Formula II
Figure imgf000018_0002
Formula II
with diphenyl chloro phosphate to get a compound of Formula III;
Figure imgf000018_0003
Formula III (b) condensing the compound of Formula III with a compound of Formula IV, wherein R is hydrogen, alkyl or substituted alkyl of Ci to C4 carbon atoms in straight or branched chain form,
Figure imgf000019_0001
Formula IV
to get a compound of Formula V;
Figure imgf000019_0002
Formula V
(c) and converting the compound of formula V to montelukast sodium of Formula I.
2. The process according to claim 1, wherein reaction of 2-(2-(3-(S)-(3-(7-chloro-2- quinolinyl)-ethenyl) phenyl)-3-hydroxypropyl)- phenyl-2-propanol of Formula II with diphenyl chloro phosphate is carried out in organic solvents such as chlorinated hydrocarbons solvent or N, N-dimethylformamide or mixture(s) thereof in the presence of base such as trimethylamine, triethylamine, tributylamine, triisopropylamine, diisopropylethylamine, pyridine, morpholine, DBU (1,8- diazabicyclo- [5. 4. 0]-undec-7-ene), DBN (1, 5-diazabicyclo- [4.3.0] non-5-ene) and 4-dimethylaminopyridine.
3. The process according to claims 1 or 2, wherein reaction of 2-(2-(3-(S)-(3-(7- chloro-2-quinolinyl)-ethenyl) phenyl)-3-hydroxypropyl)- phenyl-2-propanol of Formula II with diphenyl chloro phosphate is carried out at a temperature in the range of -7O0C to -100C for 0.5 hour to 3 hours.
4. The process according to claim 1 , wherein compound of Formula III obtained from step a is further reacted with a compound of Formula IV in organic solvent such as dimethylsulfoxide, N, N-dimethylformamide and tetrahydrofuran in the presence of base at a temperature in the range oft 0°C to 300C for 3 hours to 24 hours
5. The process according to claim 4, wherein the base is selected from the group comprising of lithium carbonate, sodium carbonate, potassium carbonate, cesium carbonate, sodium bicarbonate, potassium bicarbonate, sodium hydroxide, potassium hydroxide, trimethylamine, triethylamine, tributylamine, triisopropylamine, diisopropylethylamine, pyridine, morpholine, DBU (1, 8-diazabicyclo- [5. 4. O]- undec-7-ene), DBN (1, 5-diazabicyclo- [4.3.0] non-5-ene), 4-dimethylaminopyridine or 1-aminoguanidine bicarbonate.
6. The process according to claim 1 , wherein a compound of Formula V is converted into montelukast sodium of Formula I by sodium hydroxide in organic solvent such as methanol, ethanol, n-propanol, iso propanol, butanol, diethyl ether, tetrahydrofuran or mixture(s) thereof.
7. The process according to claims 6, wherein reaction of a compound of Formula V with sodium hydroxide is carried out at a temperature in the range of 00C to 300C for 1 hour to 55 hours.
8. The process according to claim 6, wherein isolation of montelukast sodium of Formula I is accomplished by crystallization with hydrocarbon solvents such as hexanes, heptanes, toluene, xylene, acetonitrile, cooling, filtration or a combination thereof.
9. A compound of Formula III
Figure imgf000021_0001
Formula III
10. A compound of claim 9, used for the preparation of montelukast sodium salt of Formula I
Figure imgf000021_0002
Formula I
PCT/IN2008/000299 2008-05-13 2008-05-13 A process for preparation of montelukast sodium salt WO2009138993A1 (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012020271A1 (en) 2010-08-11 2012-02-16 Richter Gedeon Nyrt. Process for the preparation of montelukast sodium
CN102442947A (en) * 2011-11-01 2012-05-09 上海璎黎科技有限公司 Preparation method of Montelukast Sodium intermediate
CN111892535A (en) * 2020-08-27 2020-11-06 鲁南制药集团股份有限公司 Synthesis method of montelukast sodium

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050256156A1 (en) * 2004-04-21 2005-11-17 Evgeny Shapiro Processes for preparing montelukast sodium
WO2006008751A2 (en) * 2004-07-19 2006-01-26 Matrix Laboratories Ltd Process for the preparation of montelukast and its salts
WO2008072872A1 (en) * 2006-12-14 2008-06-19 Hanmi Pharm. Co., Ltd. Method of preparing montelukast and intermediates used therein

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050256156A1 (en) * 2004-04-21 2005-11-17 Evgeny Shapiro Processes for preparing montelukast sodium
WO2006008751A2 (en) * 2004-07-19 2006-01-26 Matrix Laboratories Ltd Process for the preparation of montelukast and its salts
WO2008072872A1 (en) * 2006-12-14 2008-06-19 Hanmi Pharm. Co., Ltd. Method of preparing montelukast and intermediates used therein

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012020271A1 (en) 2010-08-11 2012-02-16 Richter Gedeon Nyrt. Process for the preparation of montelukast sodium
CN102442947A (en) * 2011-11-01 2012-05-09 上海璎黎科技有限公司 Preparation method of Montelukast Sodium intermediate
CN102442947B (en) * 2011-11-01 2013-10-16 上海璎黎科技有限公司 Preparation method of Montelukast Sodium intermediate
CN111892535A (en) * 2020-08-27 2020-11-06 鲁南制药集团股份有限公司 Synthesis method of montelukast sodium
CN111892535B (en) * 2020-08-27 2023-04-11 鲁南制药集团股份有限公司 Synthesis method of montelukast sodium

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