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Sitafloxacin preparation method

A technology of sitafloxacin and compounds, applied in the field of new chemical drug preparation technology, can solve the problems of large environmental pollution, cumbersome post-processing, high cost, etc., and achieve the effect of reducing pollution

Active Publication Date: 2014-01-22
NANJING YOUKE BIOLOGICAL MEDICAL RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The steps in the synthetic route of the prior art are relatively long, the post-treatment is cumbersome, and the cost is high, and thionyl chloride is often used as a solvent for one-step reaction, which has relatively large environmental pollution
Moreover, the prices of reagents such as triethyl orthoformate and trifluoroacetic acid are relatively expensive, which restricts the production cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Example 1 Synthesis of N, N-dimethylamino ethyl acrylate

[0038] The reaction equation is as follows:

[0039]

[0040] References: Wang Weiqiang, Gu Haining, etc. Synthesis of N,N-Dimethylaminoethyl Acrylate. Chemical Production and Technology, 2008, 15(4): 29-33.

[0041] Examples are as follows

[0042] In a dry reaction vessel, add 400 mL of toluene and 58 g of sodium ethoxide, cool to -5~0°C, add dropwise a mixture of 82 g of ethyl acetate and 99 g of ethyl formate, which have been re-evaporated, under 0°C. After reacting for 10-11h, continue to add 60g of dimethylamino hydrochloride, stir and react at 25-30℃ for 10-11h. After the reaction is completed, it is filtered, and the filtrate is rotary evaporated to recover toluene. The residue is distilled to obtain the target product, N,N-di The ethyl methaminoacrylate is about 75g, and the total yield is about 58%.

[0043]

Embodiment 2

[0044] Example 2 Synthesis of (s)-(-)-7-tert-butoxycarbonylamino-5-azaspiro[2.4]heptane

[0045] The reaction equation is as follows:

[0046]

[0047] Examples are as follows

[0048] Add 350g of compound of formula a, 3.5L of methanol, 80g of 10%Pd / C to the reaction vessel, add 180mL of formic acid dropwise, stir for 7h at room temperature, after the reaction is complete, filter with suction, concentrate the filtrate to dryness, add dichloromethane and water to the remainder , Adjust pH 11-12 with 10% sodium hydroxide at 0-5°C, separate the layers, extract the aqueous layer twice with dichloromethane, combine the organic layers, wash with saturated sodium chloride solution, and dry the organic layer with anhydrous sodium sulfate. The desiccant was filtered off, and the filtrate was concentrated to dryness under reduced pressure to obtain a yellow oil. When cooled, about 220 g of colorless crystals were obtained with a yield of 90%.

[0049]

Embodiment 3

[0050] Example 3 Preparation of crude sitafloxacin

[0051] Dissolve 2,4,5-trifluoro-3-chlorobenzoic acid (84g, 0.4mol) in DMF 252mL, add oxalyl chloride (55.8g, 0.44mol), and react at 35°C for 2h. Dissolve triethylamine (48.5g, 0.48mol) and N,N-dimethylaminoethyl acrylate (58g, 0.4mol) with about 126mL of dichloromethane and add dropwise to the above reaction solution, warm to 50°C, and stir. The reaction was carried out for 2.5 hours, TLC monitored the reaction to be complete, cooled to room temperature, and acidified by adding acetic acid (27g, 0.44mol).

[0052] Mix (1R, 2S)-(-)-cis-1-amino-2-fluorocyclopropane p-toluenesulfonate (99g, 0.4mol) and 200mL of dichloromethane, reduce the temperature to -10°C, stir, and slowly Add triethylamine (47g, 0.46mol) dropwise, control the temperature below 0°C, after the dropwise addition is complete, keep stirring for 18min, add dropwise to the above reaction solution, continue the reaction at 30°C for 1h, after the reaction is completed,...

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Abstract

The invention discloses a sitafloxactin preparation method which comprises taking 2,4,5-trifluoro-3-chlorobenzoic acid as a starting material and conducting a series of steps like acylation, esterification, substitution, cyclization, substitution, deprotection, so that 7-[(7S)-7-amino-5-azaspiro[2.4]heptan-6-yl]-8-chloro-6-fluoro-1-[(1R,2S)-2-fluorocyclopropyl]-1,4-oxo-3-quinoline carboxylic acid, namely the sitafloxacin, is prepared. The method is relatively low in cost, simple in operation, mild in reaction, high in reaction yield and product purity, and meets the requirements of large-scale industrial production.

Description

Technical field [0001] The invention relates to a new preparation method of sitafloxacin, which belongs to the field of new chemical medicine preparation technology. Background technique [0002] Sitafloxacin is a powerful and broad-spectrum quinolone antibacterial drug newly developed by Sankyo Co., Ltd. of Japan Daiichi Pharmaceutical Co., Ltd. for the treatment of serious refractory infectious diseases and bacterial infections caused by drug-resistant bacteria. [0003] Sitafloxacin contains a cis-flucypromine group in its structure, which has good pharmacokinetic characteristics and can reduce adverse reactions. Its in vitro antibacterial activity is significantly enhanced compared with most similar drugs. Sitafloxacin not only has antibacterial activity against gram-negative bacteria, but also against gram-positive bacteria (methicillin-resistant Staphylococcus aureus, methicillin-resistant Staphylococcus epidermidis), anaerobic bacteria (including Bacteroides fragilis) ), My...

Claims

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Application Information

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IPC IPC(8): C07D401/04C07C229/34C07C227/18
CPCC07D401/04
Inventor 车晓明闵涛史为龙张峰薛峪泉
Owner NANJING YOUKE BIOLOGICAL MEDICAL RES
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