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Method for preparing bromhexine hydrochloride

A technology of bromhexine hydrochloride and salt-forming reaction, which is applied in the field of preparation of bromhexine hydrochloride, can solve problems such as inability to realize large-scale production, high requirements for production equipment conditions, and difficulty in achieving reaction temperature, etc., and achieve safe, reliable and comparatively safe production process. The effect of less pollution and low price

Active Publication Date: 2012-08-01
SHIJIAZHUANG DONGFANG PHARMA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This route has few operating steps, but the starting material 2-amino-3,5-dibromobenzyl alcohol is expensive, requires high production equipment conditions, and the reaction temperature -70 ° C is difficult to achieve, the production cost is high and large-scale production cannot be realized

Method used

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  • Method for preparing bromhexine hydrochloride
  • Method for preparing bromhexine hydrochloride
  • Method for preparing bromhexine hydrochloride

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] (1) Synthesis of 2-amino-3,5-dibromobenzyl alcohol

[0057]

[0058] The reaction type is a reduction reaction. The starting material 2-amino-3,5-dibromobenzaldehyde (YL-1) reacts with the reducing agent sodium borohydride at room temperature, and the product is 2-amino-3,5-dibromo Benzyl alcohol (ZJT-1).

[0059] In the study, the reaction solvent was first screened. According to experience, it is easier to reduce the carbonyl group with sodium borohydride. Commonly used solvents include: water, lower alcohols (methanol, ethanol, isopropanol), ethers (tetrahydrofuran, ether, methyl alcohol, etc.) base tert-butyl ether). We have carried out experimental screening with above-mentioned solvent respectively, the result finds that this step reaction is carried out comparatively slowly in ether solvent, and thin-layer chromatography (TLC) detection shows in the test: in tetrahydrofuran, diethyl ether, methyl tert-butyl ether, initial The raw material YL-1 still has a lo...

Embodiment 2

[0092] (1) Synthesis of 2-amino-3,5-dibromobenzyl alcohol

[0093] Suspend 11.2g (0.04mol) of 2-amino-3,5-dibromobenzaldehyde in 20ml of ethanol, below 25 degrees (cooled by ice-water bath), add 0.95g (0.025mol) of sodium borohydride solid in batches within 15min After the addition, stir at room temperature for 1.5 h, dilute with 50 ml of distilled water, adjust the pH value to 6 with 6% hydrochloric acid at room temperature, and stir vigorously for 0.5 h. Filter, wash with distilled water (20ml×3), suck dry, and dry (70°C for 2h) to obtain off-white solid 2-amino-3,5-dibromobenzyl alcohol.

[0094] (2) Synthesis of 2,4-dibromo-6-chloromethylaniline

[0095] Under cooling in an ice-water bath (5-25 degrees), add 30ml of SOCl within 10 minutes 2 10 g (0.0357 mol) of 2-amino-3,5-dibromobenzyl alcohol was added in batches, and after the addition was complete, it was stirred overnight at room temperature. Evaporate excess SOCl under reduced pressure below 30 degrees 2 , a larg...

Embodiment 3

[0120] Suspend 25g of 2-amino-3,5-dibromobenzaldehyde (YL-1) in 40ml of ethanol, add 1.5g of sodium borohydride solid in batches within 15min at 15-40°C (under ice-water bath cooling), After the addition, stir at room temperature for 1.5 h, add 120 ml of purified water to dilute, adjust the pH value to 6.0 with 36% hydrochloric acid at room temperature, and stir vigorously for 0.5 h. Filter, wash with purified water (20ml×3), suck dry, and dry at 80°C for 2h to obtain off-white solid 2-amino-3,5-dibromobenzyl alcohol (ZJT-1). The operation was repeated three times, and the reaction yields were 98.6%, 98.0%, and 98.0%, respectively. After testing, the melting points were 152.7-153.3°C, 152.8-153.2°C, and 152.7-153.2°C, respectively.

[0121] (2) Synthesis of 2,4-dibromo-6-chloromethylaniline

[0122] At 10~35°C (cooled by ice-water bath), add 75ml SOCl within 10min 2 Add 24 g of 2-amino-3,5-dibromobenzyl alcohol in batches, and stir at room temperature for 1 h after the addi...

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Abstract

The invention provides a method for preparing bromhexine hydrochloride, which comprises the steps as follows: (1) 2-amino-3,5-dibromo benzaldehyde and reducing agents are in a reduction reaction to generate 2-amino-3,5-dibromo benzyl alcohol; (2) 2-amino-3, 5-dibromo benzyl alcohol that is obtained in the step (1) reacts with chlorinating agents to generate 2, 4-bromine-6-chloride methylaniline; and (3) 2,4-bromine-6-chloride methylaniline obtained in the step (2) and N-methylcyclohexylamine are in an amination reaction, and then 2, 4-bromine-6-chloride methylaniline and HCl salification agents are in a salification reaction, so that bromhexine hydrochloride is obtained. The preparation method adopts multiple advanced technologies, is easy to get starting materials, and has the advantages of stable property of intermediates, extremely low environment pollution, high yield coefficient of products and high purity.

Description

technical field [0001] The invention belongs to the field of medicinal chemistry, and in particular relates to a method for preparing bromhexine hydrochloride. Background technique [0002] Bromhexine Hydrochloride is white or off-white crystalline powder, odorless, tasteless, slightly soluble in ethanol and chloroform, very slightly soluble in water, and its chemical name is N-methyl-N-ring Hexyl-2-amino-3,5-dibromobenzylamine hydrochloride, the chemical structure is as follows: [0003] [0004] bromhexine hydrochloride [0005] Bromhexine hydrochloride is the preferred expectorant commonly used at home and abroad. It can decompose and break acidic mucopolysaccharide fibers in sputum, and can inhibit the synthesis of acidic mucopolysaccharides in glandular goblet cells, thereby reducing the viscosity of sputum and making it easier to cough up. No nausea expectorant effect. It is mainly used for chronic bronchitis, asthma, bronchiectasis, silicosis and other patients ...

Claims

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Application Information

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IPC IPC(8): C07C211/52C07C209/68
Inventor 张凯程诚杜玉民薛娜韩丰年马旭伟
Owner SHIJIAZHUANG DONGFANG PHARMA
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