WO2004085426A1 - Novel crystalline forms of candesartan cilexetil - Google Patents

Novel crystalline forms of candesartan cilexetil Download PDF

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Publication number
WO2004085426A1
WO2004085426A1 PCT/IN2003/000090 IN0300090W WO2004085426A1 WO 2004085426 A1 WO2004085426 A1 WO 2004085426A1 IN 0300090 W IN0300090 W IN 0300090W WO 2004085426 A1 WO2004085426 A1 WO 2004085426A1
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Prior art keywords
candesartan cilexetil
dioxane
ray powder
powder diffraction
diffraction pattern
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PCT/IN2003/000090
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French (fr)
Inventor
Reddy Bandi Parthasaradhi
Reddy Kura Rathnakar
Reddy Rapolu Raji
Reddy Dasari Muralidhara
Reddy Kesireddy Subash Chander
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Hetero Drugs Limited
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Priority to PCT/IN2003/000090 priority Critical patent/WO2004085426A1/en
Priority to US10/509,141 priority patent/US7504516B2/en
Priority to AU2003230193A priority patent/AU2003230193A1/en
Publication of WO2004085426A1 publication Critical patent/WO2004085426A1/en

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    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D403/00—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, not provided for by group C07D401/00
    • C07D403/02—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, not provided for by group C07D401/00 containing two hetero rings
    • C07D403/10—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, not provided for by group C07D401/00 containing two hetero rings linked by a carbon chain containing aromatic rings

Definitions

  • the present invention relates to two novel crystalline forms and a novel
  • Candesartan cilexetil is an antihypertensive agent and its therapeutic uses were disclosed in US 5,196,444. US 5,196,444 also disclosed a crystalline form of candesartan cilexetil (C-type crystalline form). Two crystalline forms of candesartan cilexetil, form I and form II, are described in Chem. Pharm. Bull. 47(2), 182-186 (1999).
  • the object of the present invention is to provide a stable novel 1 ,4- dioxane solvate of candesartan cilexetil and two stable crystalline forms of candesartan cilexetil, processes for preparing these forms and pharmaceutical compositions containing them.
  • One aspect of the present invention is to provide a novel 1 ,4-dioxane solvate of candesartan cilexetil (hereinafter referred to as candesartan cilexetil dioxane solvate).
  • candesartan cilexetil dioxane solvate typically the content of 1 ,4-dioxane in the solvate is 8.8 to 13.0 % w/w.
  • the candesartan cilexetil dioxane solvate is characterized by an x- ray powder diffraction pattern having peaks expressed as 2 ⁇ at about 6.0, 10.7, 16.2, 18.0, 19.7, 20.6, 21.3, 21.7, and 22.3 degrees.
  • Figure 1 shows typical x- ray powder diffraction pattern of candesartan cilexetil dioxane solvate.
  • Candesartan cilexetil dioxane solvate is prepared by dissolving crystalline form or amorphous form of candesartan cilexetil in 1 ,4-dioxane and crystallizing at 5°C to15°C, preferably at 5°C to 10°C.
  • Another aspect of the present invention is to provide a novel crystalline form of candesartan cilexetil (hereinafter referred to as candesartan cilexetil form III, characterized by an x-ray powder diffraction pattern having peaks at about 6.3, 7.3, 8.1 , 8.9, 10.1 , 14.6, 15.0, 15.8, and 18.8 degree.
  • Figure 2 shows typical x-ray powder diffraction pattern of candesartan cilexetil form III.
  • the candesartan cilexetil form III is prepared by dissolving candesartan cilexetil in toluene by heating, cooling the solution slowly to 0°C to 5°C, maintaining at 0°C to 5°C for about 1 hour and separating the crystals formed by filtration.
  • the solvent may be heated to dissolve candesartan cilexetil.
  • Candesartan cilexetil used in the process may be any of the crystalline forms except form III, amorphous form or candesartan cilexetil dioxane solvate.
  • candesartan cilexetil form IV Another aspect of the present invention is to provide a novel crystalline form of candesartan cilexetil (hereinafter referred to as candesartan cilexetil form IV).
  • the candesartan cilexetil form IV is characterized by an x-ray powder diffraction pattern having peaks at about 6.1, 7.1 , 11.6, 11.9, 17.9, 19.8 and 21.2 degree.
  • Figure 3 shows typical x-ray powder diffraction pattern of candesartan cilexetil form IV.
  • the candesartan cilexetil form IV is prepared by mixing candesartan cilexetil, methyl tert-butyl ether and methanol at 50°C 55°C and maintaining at 20°C to 25°C for about 10 hours.
  • Candesartan cilexetil used in the process may be any of the crystalline forms except form IV, amorphous form or candesartan cilexetil dioxane solvate.
  • Candesartan cilexetil used in the above processes may be obtained by the known methods.
  • a pharmaceutical composition comprising crystalline form III or form IV of candesartan cilexetil and a pharmaceutically acceptable carrier.
  • Figure 1 is a x-ray powder diffraction pattern of candesartan cilexetil dioxane solvate.
  • Figure 2 is a x-ray powder diffraction pattern of candesartan cilexetil form III.
  • Figure 3 is a x-ray powder diffraction pattern of candesartan cilexetil form IV. x-Ray powder diffraction spectrum was measured on a Siemens D5000 x-ray powder diffractometer having a copper-K ⁇ radiation.
  • Example 1 Candesartan cilexetil C-type crystalline form (5 gm, obtained by a process described in US 5,196,444) is dissolved in 1,4-dioxane (50 ml) at 25°C. The solution is cooled to 5°C and maintained for 4 hours at about 5°C. The separated solid is filtered to yield 3 gm candesartan cilexetil dioxane solvate.
  • Example 2 Candesartan cilexetil C-type crystalline form (5 gm) is added to toluene (25 ml) and heated to reflux. The contents are maintained under reflux for 15 minutes and then cooled slowly to 0°C in 1 hour and maintained at 0°C to 5°C for 1 hour. The separated crystals are collected by filtration to give 3.5 gm candesartan cilexetil form III.
  • Example 3 Example 1 is repeated using candesartan cilexetil form III instead of candesartan cilexetil C-type crystalline form to give Candesartan cilexetil dioxane solvate.
  • Example 4 The mixture of candesartan cilexetil C-type crystalline form (5 gm), methyl tert-butyl ether (50 ml) is heated to 55°C, methanol (17 ml) is added to the mixture at 55°C and maintained at about this temperature for 1 hour. The contents are cooled to 25°C and maintained at about 25°C for 13 hours. The separated solid is collected by filtration to give 3 gm candesartan cilexetil form IV.
  • Example 5 Example 2 is repeated using candesartan cilexetil form IV instead of candesartan cilexetil C-type crystalline form to give Candesartan cilexetil form III.
  • Example 6 Example 4 is repeated using candesartan cilexetil dioxane solvate instead of candesartan cilexetil C-type crystalline form to give Candesartan cilexetil form IV.

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

Abstract

The present invention relates to two novel crystalline forms and a novel 1,4-dioxane solvate of candesartan cilexetil, to processes for their preparation and to pharmaceutical compositions containing them.

Description

NOVEL CRYSTALLINE FORMS OF CANDESARTAN CILEXETIL
FIELD OF THE INVENTION
The present invention relates to two novel crystalline forms and a novel
1 ,4-dioxane solvate of candesartan cilexetil, to processes for their preparation and to pharmaceutical compositions containing them.
BACKGROUND OF THE INVENTION
Candesartan cilexetil of formula (1):
Figure imgf000002_0001
or 2-Ethoxy-1 -[[2'-(1 H-tetrazol-5-yl)[1 , 1 '-biphenyl]-4-yl]methyl]-1 H- benzimidazole-7-carboxylic acid, 1-[[(Cyclohexyloxy)carbonyl]oxy]ethyl ester. Candesartan cilexetil is an antihypertensive agent and its therapeutic uses were disclosed in US 5,196,444. US 5,196,444 also disclosed a crystalline form of candesartan cilexetil (C-type crystalline form). Two crystalline forms of candesartan cilexetil, form I and form II, are described in Chem. Pharm. Bull. 47(2), 182-186 (1999).
We have discovered a novel 1 ,4-dioxane solvate of candesartan cilexetil and two novel crystalline forms of candesartan cilexetil. The novel forms have been found to be stable and reproducible. The object of the present invention is to provide a stable novel 1 ,4- dioxane solvate of candesartan cilexetil and two stable crystalline forms of candesartan cilexetil, processes for preparing these forms and pharmaceutical compositions containing them. DETAILED DESCRIPTION OF THE INVENTION
One aspect of the present invention is to provide a novel 1 ,4-dioxane solvate of candesartan cilexetil (hereinafter referred to as candesartan cilexetil dioxane solvate). Typically the content of 1 ,4-dioxane in the solvate is 8.8 to 13.0 % w/w. The candesartan cilexetil dioxane solvate is characterized by an x- ray powder diffraction pattern having peaks expressed as 2Θ at about 6.0, 10.7, 16.2, 18.0, 19.7, 20.6, 21.3, 21.7, and 22.3 degrees. Figure 1 shows typical x- ray powder diffraction pattern of candesartan cilexetil dioxane solvate. Candesartan cilexetil dioxane solvate is prepared by dissolving crystalline form or amorphous form of candesartan cilexetil in 1 ,4-dioxane and crystallizing at 5°C to15°C, preferably at 5°C to 10°C.
Another aspect of the present invention is to provide a novel crystalline form of candesartan cilexetil (hereinafter referred to as candesartan cilexetil form III, characterized by an x-ray powder diffraction pattern having peaks at about 6.3, 7.3, 8.1 , 8.9, 10.1 , 14.6, 15.0, 15.8, and 18.8 degree. Figure 2 shows typical x-ray powder diffraction pattern of candesartan cilexetil form III.
The candesartan cilexetil form III is prepared by dissolving candesartan cilexetil in toluene by heating, cooling the solution slowly to 0°C to 5°C, maintaining at 0°C to 5°C for about 1 hour and separating the crystals formed by filtration. The solvent may be heated to dissolve candesartan cilexetil. Candesartan cilexetil used in the process may be any of the crystalline forms except form III, amorphous form or candesartan cilexetil dioxane solvate.
Another aspect of the present invention is to provide a novel crystalline form of candesartan cilexetil (hereinafter referred to as candesartan cilexetil form IV). The candesartan cilexetil form IV is characterized by an x-ray powder diffraction pattern having peaks at about 6.1, 7.1 , 11.6, 11.9, 17.9, 19.8 and 21.2 degree. Figure 3 shows typical x-ray powder diffraction pattern of candesartan cilexetil form IV. The candesartan cilexetil form IV is prepared by mixing candesartan cilexetil, methyl tert-butyl ether and methanol at 50°C 55°C and maintaining at 20°C to 25°C for about 10 hours. Candesartan cilexetil used in the process may be any of the crystalline forms except form IV, amorphous form or candesartan cilexetil dioxane solvate. Candesartan cilexetil used in the above processes may be obtained by the known methods.
In accordance with the present invention, there is provided a pharmaceutical composition comprising crystalline form III or form IV of candesartan cilexetil and a pharmaceutically acceptable carrier.
BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a x-ray powder diffraction pattern of candesartan cilexetil dioxane solvate. Figure 2 is a x-ray powder diffraction pattern of candesartan cilexetil form III.
Figure 3 is a x-ray powder diffraction pattern of candesartan cilexetil form IV. x-Ray powder diffraction spectrum was measured on a Siemens D5000 x-ray powder diffractometer having a copper-Kα radiation.
The following examples further illustrate the invention.
Example 1 Candesartan cilexetil C-type crystalline form (5 gm, obtained by a process described in US 5,196,444) is dissolved in 1,4-dioxane (50 ml) at 25°C. The solution is cooled to 5°C and maintained for 4 hours at about 5°C. The separated solid is filtered to yield 3 gm candesartan cilexetil dioxane solvate.
Example 2 Candesartan cilexetil C-type crystalline form (5 gm) is added to toluene (25 ml) and heated to reflux. The contents are maintained under reflux for 15 minutes and then cooled slowly to 0°C in 1 hour and maintained at 0°C to 5°C for 1 hour. The separated crystals are collected by filtration to give 3.5 gm candesartan cilexetil form III.
Example 3 Example 1 is repeated using candesartan cilexetil form III instead of candesartan cilexetil C-type crystalline form to give Candesartan cilexetil dioxane solvate.
Example 4 The mixture of candesartan cilexetil C-type crystalline form (5 gm), methyl tert-butyl ether (50 ml) is heated to 55°C, methanol (17 ml) is added to the mixture at 55°C and maintained at about this temperature for 1 hour. The contents are cooled to 25°C and maintained at about 25°C for 13 hours. The separated solid is collected by filtration to give 3 gm candesartan cilexetil form IV.
Example 5 Example 2 is repeated using candesartan cilexetil form IV instead of candesartan cilexetil C-type crystalline form to give Candesartan cilexetil form III.
Example 6 Example 4 is repeated using candesartan cilexetil dioxane solvate instead of candesartan cilexetil C-type crystalline form to give Candesartan cilexetil form IV.

Claims

We claim:
1. A candesartan cilexetil 1 ,4-dioxane solvate.
2. A candesartan cilexetil 1 ,4-dioxane solvate of claim 1 , wherein the content of 1 ,4-dioxane is 8.8 to 13.0 % w/w. 3. A candesartan cilexetil 1 ,4-dioxane solvate of claim 1 , characterized by an x- ray powder diffraction pattern having peaks expressed as 2Θ at about 6.0, 10.7, 16.2, 18.0, 19.7, 20.6, 21.3, 21.7, and 22.
3 degrees. 4. Candesartan cilexetil 1 ,
4-dioxane solvate of claim 3, further characterized by an x-ray powder diffraction pattern as in figure 1.
5. A process for the preparation of candesartan cilexetil 1 ,4-dioxane solvate of claim 1 , which comprises: a) dissolving candesartan cilexetil in 1 ,4-dioxane; and b) crystallizing candesartan cilexetil as 1 ,4-dioxane solvate from the solution at 5°C to 15°C.
6. A process according to claim 5, wherein candesartan cilexetil used is a crystalline or amorphous form of candesartan cilexetil.
7. A process according to claim 6, wherein the crystalline form of candesartan cilexetil is candesartan cilexetil form III.
8. A crystalline candesartan cilexetil form III, characterized by an x-ray powder diffraction pattern having peaks expressed as 2Θ at about 6.3, 7.3, 8.1 , 8.9,
10.1 , 14.6, 15.0, 15.8, and 18.8 degrees.
9. Candesartan cilexetil form III of claim 8, further characterized by an x-ray powder diffraction pattern as in figure 2.
10. A process for the preparation of candesartan cilexetil form III of claim 8, which comprises: a) mixing candesartan cilexetil with toluene; b) heating to obtain clear solution; c) cooling slowly to 0°C to 5°C in about 1 hour; d) maintaining at 0°C to 5°C for about 1 hour; and e) filtering the separated solid.
11. A process according to claim 10, wherein candesartan cilexetil used is candesartan cilexetil as 1 ,4-dioxane solvate of claim 1.
12. A crystalline candesartan cilexetil form IV, characterized by an x-ray powder diffraction pattern having peaks expressed as 2Θ at about 6.1 , 7.1 , 11.6, 11.9, 17.9, 19.8 and 21.2 degrees.
13. Candesartan cilexetil form IV of claim 12, further characterized by an x-ray powder diffraction pattern as in figure 3.
14. A process for the preparation of candesartan cilexetil form IV of claim 12, which comprises: a) heating the mixture of candesartan cilexetil, methyl tert-butyl ether and methanol to 50°C to 55°C; b) cooling to 20°C to 25°C; c) maintaining at 20°C to 25°C for about 10 hours; and d) separated crystals are collected by filtration.
15. A process according to claim 14, wherein candesartan cilexetil used is a crystalline or amorphous or dioxane solvated form of candesartan cilexetil.
16. A process according to claim 15, wherein candesartan cilexetil used is candesartan cilexetil 1 ,4-dioxane solvate of claim 1.
17. A process according to claim 15, wherein candesartan cilexetil used is candesartan cilexetil form III of claim 8.
18. A pharmaceutical composition comprising candesartan cilexetil form III of claim 8 or candesartan cilexetil form IV of claim 12 and a pharmaceutically acceptable carrier.
19. A pharmaceutical composition of claim 18, wherein candesartan cilexetil form III is used.
20. A pharmaceutical composition of claim 18, wherein candesartan cilexetil form IV is used.
PCT/IN2003/000090 2003-03-27 2003-03-27 Novel crystalline forms of candesartan cilexetil WO2004085426A1 (en)

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005330277A (en) * 2004-05-19 2005-12-02 Teva Pharmaceutical Industries Ltd Candesartan cilexetil polymorph
WO2005123721A2 (en) * 2004-06-18 2005-12-29 Ranbaxy Laboratories Limited Amorphous and polymorphic forms of candesartan cilexetil
WO2005077941A3 (en) * 2004-02-11 2006-06-22 Teva Pharma Candesartan cilexetil polymorphs
WO2007019448A2 (en) * 2005-08-08 2007-02-15 Nitromed, Inc. Nitric oxide enhancing angiotensin ii antagonist compounds, compositions and methods of use
WO2008035360A2 (en) * 2006-06-13 2008-03-27 Alembic Limited Novel crystalline forms of candesartan cilexetil, candesartan, tritylated candesartan and tritylated candesartan cilexetil
EP1952806A1 (en) 2007-02-01 2008-08-06 Helm AG Process for the preparation of adsorbates of candesartan
JP2009185060A (en) * 2004-05-19 2009-08-20 Teva Pharmaceutical Industries Ltd Candesartan cilexetil polymorph
CN109627234A (en) * 2019-01-30 2019-04-16 浙江省食品药品检验研究院 A kind of candesartan cilexetil crystal and preparation method thereof

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DE102004060699A1 (en) * 2004-12-16 2006-06-22 Ratiopharm Gmbh Process for the preparation of candesartan
ATE441637T1 (en) * 2005-02-03 2009-09-15 Ratiopharm Gmbh METHOD FOR PRODUCING LOSARTAN
CN102106160B (en) * 2009-05-25 2014-12-31 松下电器产业株式会社 Piezoelectric acoustic transducer

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Cited By (12)

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WO2005077941A3 (en) * 2004-02-11 2006-06-22 Teva Pharma Candesartan cilexetil polymorphs
US7692023B2 (en) 2004-02-11 2010-04-06 Teva Pharmaceutical Industries Ltd. Candesartan cilexetil polymorphs
JP2005330277A (en) * 2004-05-19 2005-12-02 Teva Pharmaceutical Industries Ltd Candesartan cilexetil polymorph
JP2009185060A (en) * 2004-05-19 2009-08-20 Teva Pharmaceutical Industries Ltd Candesartan cilexetil polymorph
WO2005123721A2 (en) * 2004-06-18 2005-12-29 Ranbaxy Laboratories Limited Amorphous and polymorphic forms of candesartan cilexetil
WO2005123721A3 (en) * 2004-06-18 2006-06-08 Ranbaxy Lab Ltd Amorphous and polymorphic forms of candesartan cilexetil
WO2007019448A2 (en) * 2005-08-08 2007-02-15 Nitromed, Inc. Nitric oxide enhancing angiotensin ii antagonist compounds, compositions and methods of use
WO2007019448A3 (en) * 2005-08-08 2009-04-30 Nitromed Inc Nitric oxide enhancing angiotensin ii antagonist compounds, compositions and methods of use
WO2008035360A2 (en) * 2006-06-13 2008-03-27 Alembic Limited Novel crystalline forms of candesartan cilexetil, candesartan, tritylated candesartan and tritylated candesartan cilexetil
WO2008035360A3 (en) * 2006-06-13 2008-10-16 Alembic Ltd Novel crystalline forms of candesartan cilexetil, candesartan, tritylated candesartan and tritylated candesartan cilexetil
EP1952806A1 (en) 2007-02-01 2008-08-06 Helm AG Process for the preparation of adsorbates of candesartan
CN109627234A (en) * 2019-01-30 2019-04-16 浙江省食品药品检验研究院 A kind of candesartan cilexetil crystal and preparation method thereof

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