US20030229249A1 - Methods for producing nateglinide B-type crystals - Google Patents

Methods for producing nateglinide B-type crystals Download PDF

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Publication number
US20030229249A1
US20030229249A1 US10/421,888 US42188803A US2003229249A1 US 20030229249 A1 US20030229249 A1 US 20030229249A1 US 42188803 A US42188803 A US 42188803A US 2003229249 A1 US2003229249 A1 US 2003229249A1
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Prior art keywords
crystals
nateglinide
type crystals
type
crystal
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US10/421,888
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Michito Sumikawa
Makoto Maruo
Kazuo Miyazaki
Shigehiro Nishina
Yukiko Matsuzawa
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Ajinomoto Co Inc
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Ajinomoto Co Inc
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Assigned to AJINOMOTO CO., INC. reassignment AJINOMOTO CO., INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: MARUO, MAKOTO, MATSUZAWA, YUKIKO, MIYAZAKI, KAZUO, NISHINA, SHIGEHIRO, SUMIKAWA, MICHITO
Publication of US20030229249A1 publication Critical patent/US20030229249A1/en
Priority to US11/757,769 priority Critical patent/US7544834B2/en
Abandoned legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C227/00—Preparation of compounds containing amino and carboxyl groups bound to the same carbon skeleton
    • C07C227/38—Separation; Purification; Stabilisation; Use of additives
    • C07C227/40—Separation; Purification
    • C07C227/42—Crystallisation
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C231/00—Preparation of carboxylic acid amides
    • C07C231/22—Separation; Purification; Stabilisation; Use of additives
    • C07C231/24—Separation; Purification
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P3/00—Drugs for disorders of the metabolism
    • A61P3/08—Drugs for disorders of the metabolism for glucose homeostasis
    • A61P3/10—Drugs for disorders of the metabolism for glucose homeostasis for hyperglycaemia, e.g. antidiabetics
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C2601/00—Systems containing only non-condensed rings
    • C07C2601/12—Systems containing only non-condensed rings with a six-membered ring
    • C07C2601/14—The ring being saturated

Definitions

  • the present invention relates to methods for producing nateglinide (its chemical name: N-(trans-4-isopropylcyclohexylcarbonyl)-D-phenylalanine) that is useful as a therapeutic agent for diabetes. More specifically, it relates to methods for producing nateglinide B-type crystals substantially free of H-type crystals.
  • nateglinide is useful as a therapeutic agent for diabetes because it effectively lowers blood glucose by oral administration (Japanese Patent Publication No. Hei 4-15221).
  • Japanese Patent Publication No. Hei 4-15221 Japanese Patent Publication No. Hei 4-15221.
  • the crystallization has to be carefully conducted under precisely controlled conditions in order to separate H-type crystals and difficulty of such crystallization procedure was problematic (see Japanese Patent No. 2,508,949).
  • one of crystal polymorphs of nateglinide has an advantage in that the B-type crystals can be easily prepared by conducting the crystallization under cooling.
  • the B-type crystals are transferred to the H-type crystals during the production stage.
  • H-type crystals were contaminated in the resulting B-type crystals.
  • a contamination of crystal polymorphs be as small as possible.
  • An object of the present invention is to provide methods for producing B-type crystals of nateglinide at an industrial scale without allowing other forms of the crystalline polymorphism to coexist.
  • the present invention provides a method for producing B-type crystals of nateglinide substantially free of H-type crystals, which comprises drying solvated wet crystals of nateglinide at a low temperature until no solvent remains and making a crystal conversion thereof.
  • the present invention provides a method for producing B-type crystals of nateglinide substantially free of H-type crystals, which comprises drying solvated materials containing nateglinide hydrates obtained by crystallizing out from a nateglinide-containing solution under cooling, at a temperature of 50° C. or lower until no solvent remains, and heating the resultant at a temperature of 60 to 110° C. to convert the crystal form of the resultant into B-type crystal.
  • Examples of the solvated wet crystals of nateglinide employed in the present invention include solvates with an alcohol such as methanol, ethanol and isopropyl alcohol, an acetate such as methyl acetate and ethyl acetate, or water.
  • the solvates with an alcohol or hydrate are usually used as the solvated wet crystals of nateglinide.
  • nateglinide is added to 60% ethanol aqueous solution so that the concentration of nateglinide becomes 5 wt %, dissolved at a temperature of around 30° C. and cooled down to 10° C. or lower to obtain the solvates.
  • the hydrates can be easily obtained by adding water to an alcohol solution, preferably ethanol solution, of nateglinide, cooling it to 10° C. or lower, thereby crystals are precipitated out, and separating the resulting crystals therefrom.
  • an alcohol solution preferably ethanol solution
  • nateglinide nateglinide
  • Solvated wet crystals obtained are dried until no solvent remains any longer.
  • the temperature employed may vary depending on the type and the amount of a solvent associated with the crystals, and may usually be 60° C. or lower, preferably 50° C. or lower. While no lower limit of the temperature is specified, a temperature of 20° C. or higher is usually employed in an economical point of view. Usually, it is preferable that the drying be conducted under the reduced pressure, and the drying can be completed in a short time of period when the pressure is as reduced as industrially possible.
  • the dried crystals obtained are converted into B-type crystals by heating at 60 to 110° C., preferably 70 to 110° C.
  • the crystal conversion is preferably conducted for 0.5 to 48 hours, more preferably 1 to 24 hours.
  • H-type crystals contaminated in the B-type crystals can be analyzed with DSC. It is preferable that no H-type crystals be detected by analyzing B-type crystals of nateglinide with the DSC.
  • the drying temperature at an early stage causes no substantial problem when wet B-type crystals of nateglinide are dried at a small scale in a laboratory since the solvent after the separation of the crystals remains only in a small amount and the drier can rapidly reach the maximum reduced pressure.
  • the B-type crystals free of H-type crystals can be produced according to methods of the present invention, even in a production at an industrial scale, for example, production of 5 Kg or more of the B-type crystals per one batch, in which the solvent remains in the crystals in a large amount after the separation from the liquid where the crystallization is conducted and the time period required for reaching the maximum reduced pressure is relatively long in the drying step.
  • the crystals were subjected to DSC, which revealed the presence of a peak specific to the B-type crystals (melting point: about 130° C.) without showing a peak specific to the H-type crystals (melting point: about 139° C.). Therefore, it is concluded that the resulting crystals are only B-type crystals which are substantially free of the H-type crystals.
  • B-type crystals of nateglinide can be produced at an industrial scale without allowing other crystal forms to be present, and a pharmaceutical formulation containing B-type crystals of nateglinide as a single nateglinide crystal can be provided at a low cost.

Abstract

A method for producing B-type crystals of nateglinide substantially free of H-type crystals is provided, which comprises drying solvated wet crystals of nateglinide at a low temperature until no solvent remains and making a crystal conversion thereof. According to this method, B-type crystals of nateglinide can be produced at an industrial scale without allowing other forms of the crystalline polymorphism to coexist.

Description

    BACKGROUND OF THE INVENTION
  • The present invention relates to methods for producing nateglinide (its chemical name: N-(trans-4-isopropylcyclohexylcarbonyl)-D-phenylalanine) that is useful as a therapeutic agent for diabetes. More specifically, it relates to methods for producing nateglinide B-type crystals substantially free of H-type crystals. [0001]
  • It is known that nateglinide is useful as a therapeutic agent for diabetes because it effectively lowers blood glucose by oral administration (Japanese Patent Publication No. Hei 4-15221). In this connection, the crystallization has to be carefully conducted under precisely controlled conditions in order to separate H-type crystals and difficulty of such crystallization procedure was problematic (see Japanese Patent No. 2,508,949). [0002]
  • On the other hand, one of crystal polymorphs of nateglinide, B-type crystals, has an advantage in that the B-type crystals can be easily prepared by conducting the crystallization under cooling. However, there is a possibility in that the B-type crystals are transferred to the H-type crystals during the production stage. In fact, when nateglinide was prepared in industrial scale, it was found that H-type crystals were contaminated in the resulting B-type crystals. Regarding nateglinide to be used as a medicine, it is preferable that a contamination of crystal polymorphs be as small as possible. Since the single crystalline form is the best desired, a method for producing B-type crystals of nateglinide by which a pharmaceutical formulation containing the B-type crystal exclusively without allowing other forms of the crystalline polymorphs to coexist has been desired to be developed. [0003]
    • DISCLOSURE OF THE INVENTION
  • An object of the present invention is to provide methods for producing B-type crystals of nateglinide at an industrial scale without allowing other forms of the crystalline polymorphism to coexist. [0004]
  • In the course of the study for the purpose of an efficient utilization of B-type crystals of nateglinide, the present inventors have found that a single crystal form of nateglinide can be produced at an industrial scale by selecting the conditions of the manufacturing process of nateglinide, and thus the present invention has been completed on the basis of this finding. [0005]
  • That is, the present invention provides a method for producing B-type crystals of nateglinide substantially free of H-type crystals, which comprises drying solvated wet crystals of nateglinide at a low temperature until no solvent remains and making a crystal conversion thereof. [0006]
  • Preferably, the present invention provides a method for producing B-type crystals of nateglinide substantially free of H-type crystals, which comprises drying solvated materials containing nateglinide hydrates obtained by crystallizing out from a nateglinide-containing solution under cooling, at a temperature of 50° C. or lower until no solvent remains, and heating the resultant at a temperature of 60 to 110° C. to convert the crystal form of the resultant into B-type crystal. [0007]
    • BEST MODE FOR CARRYING OUT THE INVENTION
  • Examples of the solvated wet crystals of nateglinide employed in the present invention include solvates with an alcohol such as methanol, ethanol and isopropyl alcohol, an acetate such as methyl acetate and ethyl acetate, or water. The solvates with an alcohol or hydrate are usually used as the solvated wet crystals of nateglinide. In cases of the solvates with ethanol, for example, nateglinide is added to 60% ethanol aqueous solution so that the concentration of nateglinide becomes 5 wt %, dissolved at a temperature of around 30° C. and cooled down to 10° C. or lower to obtain the solvates. [0008]
  • Among these, it is preferable that the hydrates can be easily obtained by adding water to an alcohol solution, preferably ethanol solution, of nateglinide, cooling it to 10° C. or lower, thereby crystals are precipitated out, and separating the resulting crystals therefrom. [0009]
  • Solvated wet crystals obtained are dried until no solvent remains any longer. In this step, the temperature employed may vary depending on the type and the amount of a solvent associated with the crystals, and may usually be 60° C. or lower, preferably 50° C. or lower. While no lower limit of the temperature is specified, a temperature of 20° C. or higher is usually employed in an economical point of view. Usually, it is preferable that the drying be conducted under the reduced pressure, and the drying can be completed in a short time of period when the pressure is as reduced as industrially possible. [0010]
  • While the drying at a low temperature can be continued until substantially no solvent remains any longer, no complete absence of the solvent is required, and the solvent may be present in an amount of about 5% by weight since it will be lost also upon the crystal conversion. [0011]
  • The dried crystals obtained are converted into B-type crystals by heating at 60 to 110° C., preferably 70 to 110° C. Usually, the crystal conversion is preferably conducted for 0.5 to 48 hours, more preferably 1 to 24 hours. [0012]
  • H-type crystals contaminated in the B-type crystals can be analyzed with DSC. It is preferable that no H-type crystals be detected by analyzing B-type crystals of nateglinide with the DSC. [0013]
  • Rising of the drying temperature at an early stage causes no substantial problem when wet B-type crystals of nateglinide are dried at a small scale in a laboratory since the solvent after the separation of the crystals remains only in a small amount and the drier can rapidly reach the maximum reduced pressure. However, the B-type crystals free of H-type crystals can be produced according to methods of the present invention, even in a production at an industrial scale, for example, production of 5 Kg or more of the B-type crystals per one batch, in which the solvent remains in the crystals in a large amount after the separation from the liquid where the crystallization is conducted and the time period required for reaching the maximum reduced pressure is relatively long in the drying step. [0014]
  • The present invention is further demonstrated with reference to the following examples, which are not intended to restrict the invention.[0015]
    • EXAMPLE 1
  • 24.5 kg of H-type crystals of nateglinide were added to 360 L of ethanol and dissolved by stirring at room temperature. 240 L of water was added thereto and cooled to 5° C. after ensuring the dissolution, and then the solution was subjected to aging at 5° C. for 1 hour. The thus-precipitated crystals were separated to obtain 43.0 kg of wet crystals. The crystals were dried on a rack drier at 45° C. for 24 hours (moisture content about 1 wt %) and further at 90° C. for 12 hours to make the crystal conversion to obtain 13.3 kg of dried crystals. The crystals were subjected to DSC, which revealed the presence of a peak specific to the B-type crystals (melting point: about 130° C.) without showing a peak specific to the H-type crystals (melting point: about 139° C.). Therefore, it is concluded that the resulting crystals are only B-type crystals which are substantially free of the H-type crystals. [0016]
    • COMPARATIVE 1
  • 37.0 kg of H-type crystals of nateglinide were added to 540 L of ethanol and dissolved by stirring at room temperature. 360 L of water was added thereto and cooled to 5° C. after ensuring the dissolution, and then the solution was subjected to aging at 5° C. for 1 hour. The thus-precipitated crystals were separated to obtain 46.7 kg of wet crystals. The crystals were dried with a conical drier at 30° C. for 3 hours (moisture content about 10 wt %) and further at 90° C. for 12 hours to make the crystal conversion to obtain 25.9 kg of dried crystals. The crystals were subjected to DSC, which showed peaks specific to the H-type crystals in addition to the B-type crystals. [0017]
    • COMPARATIVE 2
  • 37.0 kg of H-type crystals of nateglinide were added to 540 L of ethanol and dissolved by stirring at room temperature. 360 L of water was added thereto and cooled to 5° C. after ensuring the dissolution, and then the solution was subjected to aging at 5° C. for 1 hour. The thus-precipitated crystals were separated to obtain 44.5 kg of wet crystals. The crystals were dried with a conical drier at 30° C. for 3 hours (moisture content about 10 wt %) and further at 90° C. for 15 hours to make the crystal conversion to obtain 26.6 kg of dried B-type crystals. The crystals were subjected to DSC, which showed peaks specific to the H-type crystals in addition to the B-type crystals. [0018]
  • By employing the conditions according to the invention, B-type crystals of nateglinide can be produced at an industrial scale without allowing other crystal forms to be present, and a pharmaceutical formulation containing B-type crystals of nateglinide as a single nateglinide crystal can be provided at a low cost. [0019]

Claims (9)

What is claimed is:
1. A method for producing B-type crystals of nateglinide substantially free of H-type crystals, which comprises drying solvated wet crystals of nateglinide at a low temperature until no solvent remains and making a crystal conversion thereof.
2. The method of claim 1, wherein the resulting B-type crystals of nateglinide are crystals wherein H-type crystals are not detected with DSC.
3. The method of claim 1, wherein the drying is conducted at a temperature of 50° C. or lower.
4. The method of claim 1, wherein the drying is conducted until substantially no solvent remains any longer.
5. The method of claim 1, wherein the solvated wet crystals are hydrates.
6. The method of claim 1, wherein the crystal conversion is conducted by heating the solvated wet crystals at 60 to 110° C.
7. The method of claim 1, wherein said both steps for drying said solvated wet crystal of nateglinide at a low temperature and for the crystal conversion are conducted at an industrial scale.
8. A method for producing B-type crystals of nateglinide substantially free of H-type crystals, which comprises drying solvated materials containing nateglinide hydrates obtained by crystallizing out from a nateglinide-containing solution under cooling, at a temperature of 50° C. or lower until no solvent remains, and heating the resultant at a temperature of 60 to 110° C. to convert the crystal form of the resultant into B-type crystal.
9. The method of claim 8, wherein the resulting B-type crystals of nateglinide are crystals wherein H-type crystals are not detected with DSC.
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Cited By (12)

* Cited by examiner, † Cited by third party
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US20030073729A1 (en) * 2000-03-17 2003-04-17 Ajinomoto Co. Inc Medicaments for diabetic complication and neuropathy, and uses thereof
US20040014815A1 (en) * 2000-10-24 2004-01-22 Ajinomoto Co. Inc. Nateglinide-containing preparation
US20040024219A1 (en) * 2000-10-18 2004-02-05 Ajinomoto Co. Inc Methods for producing acylphenylalanine
US20040030182A1 (en) * 2000-10-18 2004-02-12 Ajinomoto Co. Inc. Methods for producing nateglinide crystals
US20040029968A1 (en) * 2000-10-24 2004-02-12 Ajinomoto Co. Inc Nateglinide-containing hydrophilic pharmaceutical preparation
WO2005110395A1 (en) * 2004-05-19 2005-11-24 University Of South Carolina System and device for magnetic drug targeting with magnetic drug carrier particles
WO2005113485A2 (en) * 2004-05-20 2005-12-01 Dr. Reddy's Laboratories Ltd. Stable nateglinide form b compositions
WO2007135533A1 (en) * 2006-05-23 2007-11-29 Aurobindo Pharma Limited Process for preparing nateglinide b-type crystals
US20070275999A1 (en) * 2005-01-31 2007-11-29 Ajinomoto Co., Inc. Pharmaceutical compositions containing a hypoglycemic agent(s) for improving or treating impaired glucose tolerance, borderline diabetes, insulin resistance or hyperinsulinemia
US7411089B2 (en) 2002-04-15 2008-08-12 Ajinomoto Co., Inc. Nateglinide crystals
US20080319075A1 (en) * 2002-07-18 2008-12-25 Ronit Yahalomi Polymorphic forms of nateglinide
WO2011157986A1 (en) 2010-06-14 2011-12-22 Cipla Limited A process for the preparation of nateglinide

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EP2261202A1 (en) * 2002-04-15 2010-12-15 Ajinomoto Co., Inc. New nateglinide crystals
US6861553B2 (en) 2002-07-03 2005-03-01 Teva Pharmaceuticals Industries Ltd. Process for preparing nateglinide and intermediates thereof
US7148376B2 (en) 2002-07-18 2006-12-12 Teva Pharmaceutical Industries Ltd. Polymorphic forms of nateglinide
US7358390B2 (en) 2002-07-18 2008-04-15 Teva Pharmaceutical Industries Ltd. Polymorphic forms of nateglinide
CA2492644A1 (en) * 2002-07-18 2004-01-29 Teva Pharmaceutical Industries Ltd. Polymorphic forms of nateglinide
US7534913B2 (en) 2002-07-18 2009-05-19 Teva Pharmaceutica Industries Ltd. Crystalline form of nateglinide
ES2279921T3 (en) * 2003-11-26 2007-09-01 A.M.S.A. Anonima Materie Sintetiche E Affini S.P.A. PROCEDURE FOR THE PREPARATION OF NATEGLINIDE PREFERRED IN FORM B.
MXPA06012793A (en) * 2004-05-07 2007-07-18 Teva Pharma Polymorphic forms of nateglinide.
US7425648B2 (en) 2005-01-03 2008-09-16 A.M.S.A. Anonima Materie Sintetiche E. Affini S.P.A. Process for the preparation of nateglinide, preferably in B-form
KR100837843B1 (en) * 2006-12-26 2008-06-13 씨제이제일제당 (주) Crystalline form of nateglinide, process for the preparation thereof, and pharmaceutical composition comprising the same
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