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Aspartic acid lomefloxacin hydrate and preparation and uses thereof

A technology of lomefloxacin aspartate and hydrate, which is applied in the field of medicine, can solve the problems such as the preparation method and application of lomefloxacin aspartate hydrate that have not been published in the literature, and achieve good water solubility.

Active Publication Date: 2008-04-09
李青 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The literature only reported lomefloxacin aspart [C 17 h 19 f 2 N 3 o 3 ·C 4 h 7 NO 4 , Molecular weight: 484.46] (Lomefloxacin Aspartate) and its use, up to now, there is no published bibliographical report on stable lomefloxacin aspartate hydrate and its preparation method and use

Method used

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  • Aspartic acid lomefloxacin hydrate and preparation and uses thereof
  • Aspartic acid lomefloxacin hydrate and preparation and uses thereof
  • Aspartic acid lomefloxacin hydrate and preparation and uses thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062]Example 1 In a three-necked flask, add 17.57 g of lomefloxacin, add 100 ml of 95% ethanol, heat to reflux to dissolve, add 20 ml of an aqueous solution of 6.66 g of L-aspartic acid, stir at 40 to 100 ° C until reflux for 2 hours, and react After completion, slowly add 180ml of absolute ethanol, cool to below 0°C, wait for the solid to precipitate, filter, rinse the solid with ethanol several times, drain it, recrystallize with ethanol water, filter under reduced pressure, and dry at about 78°C for 6 hours to obtain Off-white crystalline powder 20.56g, easily soluble in water, MS (ESI, EI) m / e: 483 (M-18), 351 (M-133), melting point: 224.5-227.6°C, uncorrected; HPLC analysis: The retention time of the main peak of the sample is consistent with that of the main peak of the lomefloxacin reference substance; Karl Fischer's method measures moisture to be 3.69%, which is consistent with the result (theoretical value 3.58%) that the sample contains 1 water of crystallization; th...

Embodiment 2

[0065] Example 2 In a three-necked flask, add 10.21g of lomefloxacin and 3.87g of L-aspartic acid, add 10ml of water and 60ml of ethanol, heat to dissolve, stir continuously at 70-90°C to complete the reaction, and slowly add 120ml of absolute ethanol , cooled to about 0°C, waited for the solid to precipitate, filtered, the solid was rinsed with ethanol, drained, recrystallized from ethanol water, filtered under reduced pressure, dried at about 80°C for 4 hours to obtain 10.82g of off-white powder, MS (ESI, EI ) m / e: 483 (M-18), 351 (M-133), melting point: 223.3-226.9 ° C, uncorrected; HPLC analysis: purity 99.3%, the retention time of the main peak of the sample is consistent with that of the lomefloxacin reference substance. Moisture (Karl Fischer method): 3.76%, thermal analysis test (TG-DTG) shows: the weight loss of the sample is not obvious before 70 ° C, and the weight loss of the platform between 70 and 130 ° C is about 3.36%, which is consistent with the sample contain...

Embodiment 3

[0068] Example 3 Put 9.28g of lomefloxacin and 3.52g of L-aspartic acid into a reaction flask, add 60ml of water, heat to reflux, then control the temperature between 50-80°C, stir and react for 2h, and after the reaction is completed, put it Freeze-dry, crystallize the obtained solid with about 22 times the volume of water, ethanol and isopropanol mixed solvent (2:10:10), cool, filter at low temperature, rinse with absolute ethanol, drain, and dry at about 50°C for 8 L-aspartic acid lomefloxacin dihydrate 9.76g, easily soluble in water, MS (ESI, EI) m / e: 483 (M-36), 351 (M-133), melting point: 215.5- 218.8°C, uncorrected; HPLC analysis: the retention time of the main peak of the sample is consistent with that of the lomefloxacin reference substance, and the water content measured by the Karl Fischer method is 6.79%, which is consistent with the result that the sample contains 2 crystal waters (theoretical value 6.92%) Consistent, thermal analysis test (TG-DTG): sample, 50 ~ 1...

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Abstract

The invention relates to a lomefloxacin aspartate hydrate and the preparation, as well as the usage. The lomefloxacin aspartate hydrate of the invention (the molecular formula is C17H19F2N3O3.C4H7NO4.nH2O, n is equal to 0.5 to 2.5), the lomefloxacin aspartate hydrate of the invention is the fluoroquinolone antibacterial agent used for human or animal respiratory infection, genitourinary infection, gastrointestinal tract bacterial infection, abdominal infection, bile duct infection, typhoid and other infections, bone and joint infection, skin soft tissue infection, sepsis and other systemic infection, other infections, such as paranasal sinusitis, otitis media, blepharitis and so on which are caused by Gram positive or negative bacteria and sensitive bacteria, the invention has the advantages of stable existence, easy storage and transportation and convenient preparation of the pharmaceutical preparations.

Description

technical field [0001] The invention relates to the technical field of medicine, in particular to provide a lomefloxacin aspartate hydrate and its preparation and application. Background technique [0002] The literature only reported lomefloxacin aspart [C 17 h 19 f 2 N 3 o 3 ·C 4 h 7 NO 4 , Molecular weight: 484.46] (Lomefloxacin Aspartate) and its use, so far, there is no published literature reporting stable lomefloxacin aspartate hydrate and its preparation method and use. Contents of the invention [0003] The present invention relates to a lomefloxacin aspartate hydrate and its preparation and use. Aspartic acid lomefloxacin hydrate of the present invention (its chemical name is: 1-ethyl-6,8-difluoro-1,4-dihydro-7-(3-methyl-1-piperazinyl) )-4-oxo-3-quinolinecarboxylic acid aspartic acid hydrate), its molecular formula is C 17 h 19 f 2 N 3 o 3 ·C 4 h 7 NO 4 ·nH 2 O, n=0.5~2.5, n can be 0.5, 0.6, 1, 1.5, 2, 2.2, 2.5 and the number between them, and i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D401/04A61K31/496A61P31/04
CPCY02A50/30
Inventor 李青刘力
Owner 李青
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