CN109734704A - A kind of candesartan cilexetil crystal and preparation method thereof - Google Patents
A kind of candesartan cilexetil crystal and preparation method thereof Download PDFInfo
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- CN109734704A CN109734704A CN201910091892.3A CN201910091892A CN109734704A CN 109734704 A CN109734704 A CN 109734704A CN 201910091892 A CN201910091892 A CN 201910091892A CN 109734704 A CN109734704 A CN 109734704A
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Abstract
The invention discloses a kind of candesartan cilexetil crystal and preparation method thereof, the X-ray powder diffraction collection of the candesartan cilexetil crystal is 5.9 ± 0.2,8.1 ± 0.2,8.6 ± 0.2,9.7 ± 0.2,10.6 ± 0.2,11.8 ± 0.2,12.5 ± 0.2,14.1 ± 0.2,14.9 ± 0.2,16.0 ± 0.2,16.5 ± 0.2,16.9 ± 0.2,18.0 ± 0.2,18.9 ± 0.2,19.5 ± 0.2,20.4 ± 0.2,21.2 ± 0.2,22.0 ± 0.2,22.5 ± 0.2,23.1 ± 0.2,23.6 ± 0.2,24.9 ± 0.2,25.0 ± 0.2,25.9 in 2 θ of the angle of diffraction ± 0.2,26.1 ± 0.2,26.9 ± 0.2,27.5 ± 0.2,28.3 ± 0.2,29.5 ± 0.2,30.2 ± 0.2,30.7 ± 0.2,31.6 ± 0.2,32.8 ± 0.2,33.4 ± 0.2,34.0 ± 0.2,34.4 ± 0.2,35.6 ± 0.2,37.0 ± 0.2,37.7 ± 0.2,38.9 ± 0.2,39.8 ± 0.2,39.9 ± 0.2,41.1 ± 0.2,43.9 ± 0.2,44.7 ± 0.2,46.9 ± 0.2,48.5 ± 0.2,49.6 ± 0.2 have diffraction maximum.Candesartan cilexetil crystal of the present invention has the advantages that purity is high and preferably stability, solubility and crystallinity, and preparation method is realized by recrystallizing in the mixed solvent, and this method is simple, is suitable for industrialized production.
Description
Technical field
The present invention relates to drug crystallization technical fields, and in particular to a kind of candesartan cilexetil crystal and preparation method thereof.
Background technique
Since in physicochemical property, (such as solubility, stability, mobility, resists dissolution rate between same drug different crystal forms
Compressibility etc.) on have differences, and the physicochemical property of crystal form drug is related to the bioavilability of drug and clinical efficacy, therefore
The polymorphic of research solid drugs just becomes one of important research content very important in drug development process.
Candesartan Cilexetil, chemical name are (±) -1- [(cyclohexyloxy) carbonyl oxygroup] ethyl -2- ethyoxyl -1- [[2 ' -
(1H- tetrazole base -5- base) biphenyl -4- base] methyl] -1H- benzimidazole-7-carboxylate is a kind of highly selective vasotonia
Plain II receptor antagonist class antihypertensive, structural formula are as follows:
Candesartan cilexetil crystal disclosed in existing commercially available and patent (such as WO2004085426, CN100400536),
There is also certain defects in the performance indicators such as stability, solubility, crystallinity and production technology.Therefore, it is badly in need of searching out one
Kind is with performance indicators such as better stability, solubility, crystallinity, the candesartan cilexetil crystal being convenient for industrialized production, from
And improve the drug quality and clinical efficacy of candesartan Cilexetil.
Summary of the invention
The technical problem to be solved by the present invention is to overcome the technological deficiency of background technique, it is brilliant to provide a kind of candesartan Cilexetil
Body and preparation method thereof.Candesartan cilexetil crystal of the present invention has purity is high and preferably stability, solubility and crystallinity etc.
Advantage, preparation method are realized by recrystallizing in the mixed solvent, and this method is simple, are suitable for industrialized production.
It is as follows that the present invention solves technical solution used by above-mentioned technical problem:
The X-ray powder diffraction collection of a kind of candesartan cilexetil crystal, the candesartan cilexetil crystal is in 2 θ of the angle of diffraction
5.9±0.2、8.1±0.2、8.6±0.2、9.7±0.2、10.6±0.2、11.8±0.2、12.5±0.2、14.1±0.2、
14.9±0.2、16.0±0.2、16.5±0.2、16.9±0.2、18.0±0.2、18.9±0.2、19.5±0.2、20.4±
0.2、21.2±0.2、22.0±0.2、22.5±0.2、23.1±0.2、23.6±0.2、24.9±0.2、25.0±0.2、
25.9±0.2、26.1±0.2、26.9±0.2、27.5±0.2、28.3±0.2、29.5±0.2、30.2±0.2、30.7±
0.2、31.6±0.2、32.8±0.2、33.4±0.2、34.0±0.2、34.4±0.2、35.6±0.2、37.0±0.2、
37.7±0.2、38.9±0.2、39.8±0.2、39.9±0.2、41.1±0.2、43.9±0.2、44.7±0.2、46.9±
0.2,48.5 ± 0.2,49.6 ± 0.2 have diffraction maximum.
Preferably, the candesartan cilexetil crystal has following X-ray powder diffraction collection:
It is highly preferred that the candesartan cilexetil crystal has X-ray powder diffraction collection substantially as shown in.
Preferably, the infrared spectroscopy of the candesartan cilexetil crystal is in 2992 ± 2cm-1、2939±2cm-1、2860±2cm-1、1755±2cm-1、1726±2cm-1、1617±2cm-1、1573±2cm-1、1551±2cm-1、1477±2cm-1、1437±
2cm-1、1415±2cm-1、1387±2cm-1、1349±2cm-1、1312±2cm-1、1280±2cm-1、1241±2cm-1、1215
±2cm-1、1159±2cm-1、1136±2cm-1、1110±2cm-1、1073±2cm-1、1033±2cm-1、1003±2cm-1、
988±2cm-1、938±2cm-1、912±2cm-1、889±2cm-1、872±2cm-1、763±2cm-1、751±2cm-1、679±
2cm-1There is absorption peak at place.
Preferably, the Raman spectrum of the candesartan cilexetil crystal is in 1710 ± 2cm-1、1598±2cm-1、1283±2cm-1、977±2cm-1There is absorption peak at place.
A kind of preparation method of candesartan cilexetil crystal includes the following steps: candesartan Cilexetil crude product being dissolved in volume ratio
For 10: 1~5 toluene-n-butanol in the mixed solvent；It is heated to reflux；It is concentrated under reduced pressure；It is placed at room temperature for crystallization；It is husky to recycle candy
Smooth crystalline esters.
Compared with prior art, the beneficial effects of the present invention are:
Candesartan cilexetil crystal of the present invention has the advantages that purity is high and preferably stability, solubility and crystallinity,
Preparation method is realized by recrystallizing in the mixed solvent, and this method is simple, is suitable for industrialized production.
Detailed description of the invention
Fig. 1 is the X-ray powder diffraction figure of candesartan cilexetil crystal made from the embodiment of the present invention 1；
Fig. 2 is the high-efficient liquid phase chromatogram of candesartan cilexetil crystal made from the embodiment of the present invention 1；
Fig. 3 is the infrared spectrogram of candesartan cilexetil crystal made from the embodiment of the present invention 1；
Fig. 4 is the Raman spectrogram of candesartan cilexetil crystal made from the embodiment of the present invention 1.
Specific embodiment
In order to better understand the content of the present invention, it is described further combined with specific embodiments below with attached drawing.Ying Li
Solution, these embodiments are only used for that the present invention is further described, rather than limit the scope of the invention.In addition, it should also be understood that,
After having read content of the present invention, person skilled in art makes some nonessential changes or adjustment to the present invention,
Still fall within protection scope of the present invention.
Candesartan Cilexetil crude product described in Examples 1 to 3 can be amorphous substance or known any crystal form, such as commercial product
Or it is made using the preparation method as described in patent WO2004085426, CN100400536.
Embodiment 1
It weighs 1.0g candesartan Cilexetil crude product to set in a round bottom flask, it is mixed that about 30ml toluene-n-butanol (10: 1) is added
Bonding solvent is heated to reflux to whole dissolutions, continues the 2h that flows back, and is concentrated under reduced pressure, and crystallization is placed at room temperature for, and decompression filters, obtained solid
Drying at room temperature, weighing, obtains 0.77g.
Embodiment 2
It weighs 1.0g candesartan Cilexetil crude product to set in a round bottom flask, it is mixed that about 30ml toluene-n-butanol (10: 3) is added
Bonding solvent is heated to reflux to whole dissolutions, continues the 2h that flows back, and is concentrated under reduced pressure, and crystallization is placed at room temperature for, and decompression filters, obtained solid
Drying at room temperature, weighing, obtains 0.71g.
Embodiment 3
It weighs 1.0g candesartan Cilexetil crude product to set in a round bottom flask, it is mixed that about 30ml toluene-n-butanol (10: 5) is added
Bonding solvent is heated to reflux to whole dissolutions, continues the 2h that flows back, and is concentrated under reduced pressure, and crystallization is placed at room temperature for, and decompression filters, obtained solid
Drying at room temperature, weighing, obtains 0.89g.
As a result:
1 crystal form is investigated
Candesartan cilexetil crystal sample, is measured using Powder X-ray Diffractometer made from Example 1, diffraction number
According to being shown in Table 1, map is shown in Fig. 1.
Instrument: D8-advance Powder X-ray Diffractometer
X-ray target: Cu
Power supply: 40kv/40mA
The angle of diffraction (2 θ) scanning range: 3 °~80 °
Step-length: 0.02 °
Candesartan cilexetil crystal X-ray powder diffraction data made from 1 embodiment 1 of table
As seen from Figure 1, find that the x-ray diffraction pattern of candesartan cilexetil crystal sample made from embodiment 1 is shown after measured
Have and be different from having diffraction maximum reported in the literature, shows that this product is new crystal.
Meanwhile the peak type of this product diffraction maximum is sharp, shows that crystallinity is good.
2 purity detectings
Candesartan cilexetil crystal sample made from Example 1, is measured, chromatographic condition and preparation side using HPLC method
Method is as follows, and map is shown in Fig. 2.
Instrument: Agilent1260 high performance liquid chromatograph
Chromatographic condition:
Mobile phase: acetonitrile-glacial acetic acid-water (65: 1: 34)
Wavelength: 254nm
Chromatographic column: Venusil MP C18(5 μm, 4.6 × 250mm)
Test sample is prepared: candesartan cilexetil crystal sample 10mg made from embodiment 1 weighed, is placed in 50ml volumetric flask,
Scale is dissolved and is diluted to acetonitrile-water (3: 2), and precision measures 2ml, sets in 10ml volumetric flask, be diluted to quarter with above-mentioned solvent
Degree to get.
It uses area normalization method to measure candesartan cilexetil crystal sample purity made from embodiment 1 as 100%, shows this
Product purity is good.
3 solubility tests
Candesartan cilexetil crystal sample made from Example 1 is appropriate, finely ground, is placed in the 0.1mol/L of 25 DEG C of certain volumes
In hydrochloric acid solution, every strength shaking in 5 minutes 30 seconds, continues 30 minutes, supersaturated solution is made, centrifugation is surveyed using HPLC
Its fixed concentration to get.The solubility test of different candesartan cilexetil crystals the results are shown in Table 2.
The solubility test result of the different candesartan cilexetil crystals of table 2
The results show that this product solubility is more preferable, higher than the product of commercialized product and existing patent report.
4 other characteristic spectrums
4.1 infrared spectrum measurement
Candesartan cilexetil crystal sample made from Example 1, is measured, map is shown in Fig. 3 using KBr tabletting.
Instrument: 6700Thermo Fisher Nicole infrared spectrophotometer
Infrared spectrum measurement the results show that this product in 2992 ± 2cm-1、2939±2cm-1、2860±2cm-1、1755±
2cm-1、1726±2cm-1、1617±2cm-1、1573±2cm-1、1551±2cm-1、1477±2cm-1、1437±2cm-1、1415
±2cm-1、1387±2cm-1、1349±2cm-1、1312±2cm-1、1280±2cm-1、1241±2cm-1、1215±2cm-1、
1159±2cm-1、1136±2cm-1、1110±2cm-1、1073±2cm-1、1033±2cm-1、1003±2cm-1、988±2cm-1、938±2cm-1、912±2cm-1、889±2cm-1、872±2cm-1、763±2cm-1、751±2cm-1、679±2cm-1Place
There is absorption peak.
4.2 Raman spectroscopy
Instrument: Invia Rama laser co-focusing micro-Raman spectroscopy
Candesartan cilexetil crystal sample made from Example 1 is measured Raman map using 532nm laser light source,
Map is shown in Fig. 4.
Raman spectroscopy the results show that this product in 1710 ± 2cm-1、1598±2cm-1、1283±2cm-1、977±
2cm-1There is absorption peak at place.
5 stability of crystal form are investigated
Candesartan cilexetil crystal sample made from the embodiment 1 for being placed at room temperature for 3 months is taken, according to the side of " investigation of 1 crystal form "
Method is measured, powder X-ray when placing the powder x-ray diffraction map of 3 months samples as the result is shown and just preparing
Diffraction maximum position consistency in diffracting spectrum shows that the crystal form of this product does not change, and this product stability of crystal form is good.
Above description is not limitation of the present invention, and the present invention is also not limited to the example above.The art it is common
Within the essential scope of the present invention, the variations, modifications, additions or substitutions made also should belong to protection of the invention to technical staff
Range.
Claims (6)
1. a kind of candesartan cilexetil crystal, which is characterized in that the X-ray powder diffraction collection of the candesartan cilexetil crystal exists
2 θ of the angle of diffraction be 5.9 ± 0.2,8.1 ± 0.2,8.6 ± 0.2,9.7 ± 0.2,10.6 ± 0.2,11.8 ± 0.2,12.5 ± 0.2,
14.1±0.2、14.9±0.2、16.0±0.2、16.5±0.2、16.9±0.2、18.0±0.2、18.9±0.2、19.5±
0.2、20.4±0.2、21.2±0.2、22.0±0.2、22.5±0.2、23.1±0.2、23.6±0.2、24.9±0.2、
25.0±0.2、25.9±0.2、26.1±0.2、26.9±0.2、27.5±0.2、28.3±0.2、29.5±0.2、30.2±
0.2、30.7±0.2、31.6±0.2、32.8±0.2、33.4±0.2、34.0±0.2、34.4±0.2、35.6±0.2、
37.0±0.2、37.7±0.2、38.9±0.2、39.8±0.2、39.9±0.2、41.1±0.2、43.9±0.2、44.7±
0.2,46.9 ± 0.2,48.5 ± 0.2,49.6 ± 0.2 have diffraction maximum.
2. a kind of candesartan cilexetil crystal as described in claim 1, which is characterized in that the candesartan cilexetil crystal has such as
Under X-ray powder diffraction collection:
3. a kind of candesartan cilexetil crystal as claimed in claim 2, which is characterized in that the candesartan cilexetil crystal has base
X-ray powder diffraction collection as shown in Figure 1 in sheet.
4. a kind of candesartan cilexetil crystal as described in claim 1, which is characterized in that the candesartan cilexetil crystal it is infrared
Spectrum is in 2992 ± 2cm-1、2939±2cm-1、2860±2cm-1、1755±2cm-1、1726±2cm-1、1617±2cm-1、
1573±2cm-1、1551±2cm-1、1477±2cm-1、1437±2cm-1、1415±2cm-1、1387±2cm-1、1349±
2cm-1、1312±2cm-1、1280±2cm-1、1241±2cm-1、1215±2cm-1、1159±2cm-1、1136±2cm-1、1110
±2cm-1、1073±2cm-1、1033±2cm-1、1003±2cm-1、988±2cm-1、938±2cm-1、912±2cm-1、889±
2cm-1、872±2cm-1、763±2cm-1、751±2cm-1、679±2cm-1There is absorption peak at place.
5. a kind of candesartan cilexetil crystal as described in claim 1, which is characterized in that the Raman of the candesartan cilexetil crystal
Spectrum is in 1710 ± 2cm-1、1598±2cm-1、1283±2cm-1、977±2cm-1There is absorption peak at place.
6. the preparation method of candesartan cilexetil crystal as claimed in any one of claims 1 to 5, wherein, which is characterized in that including such as
Lower step: candesartan Cilexetil crude product is dissolved in toluene-n-butanol in the mixed solvent that volume ratio is 10: 1~5；It is heated to reflux；
It is concentrated under reduced pressure；It is placed at room temperature for crystallization；Recycle candesartan cilexetil crystal.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1953973A (en) * | 2004-05-05 | 2007-04-25 | 特瓦制药工业有限公司 | Preparation of candesartan cilexetil in high purity |
| CN101941965A (en) * | 2010-09-14 | 2011-01-12 | 青岛黄海制药有限责任公司 | Preparation method of candesartan cilexetil |
| CN102887890A (en) * | 2012-11-06 | 2013-01-23 | 峨眉山天梁星制药有限公司 | Synthesis method of candesartan cilexetil |
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- 2019-01-30 CN CN201910091892.3A patent/CN109734704A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1953973A (en) * | 2004-05-05 | 2007-04-25 | 特瓦制药工业有限公司 | Preparation of candesartan cilexetil in high purity |
| CN101941965A (en) * | 2010-09-14 | 2011-01-12 | 青岛黄海制药有限责任公司 | Preparation method of candesartan cilexetil |
| CN102887890A (en) * | 2012-11-06 | 2013-01-23 | 峨眉山天梁星制药有限公司 | Synthesis method of candesartan cilexetil |
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