Method for synthesizing Lomerizine Hydrochlortde

A technology of lomerizine hydrochloride and its synthesis method, which is applied in the direction of organic chemistry, etc., and can solve the problems of low industrial production value, low yield of lomerizine hydrochloride synthesis technology, and difficulty in obtaining medicinal crystal forms of lomerizine hydrochloride To achieve the effect of shortening treatment time, reasonable treatment, and relieving pain

Inactive Publication Date: 2005-01-12
NANJING CHANGAO PHARMA SCI & TECH CO LTD
View PDF0 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved in the present invention is that the existing lomerizine hydrochloride synthesis technology yield is low,

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for synthesizing Lomerizine Hydrochlortde

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0020] Example 1:

[0021] Put 1020g of 2,3,4-trimethoxybenzaldehyde and 1500g of bis(4-fluorophenyl)methylpiperazine into the reaction flask and slowly melt it in an oil bath at 100°C. After melting is complete, slowly add 260ml of formic acid dropwise. After dripping, continue to stir and react at this temperature for 1 hour, cool to room temperature, add 960ml of concentrated hydrochloric acid (37%) and 9600ml of absolute ethanol and stir and reflux for 1 hour, then add 60g of activated carbon, and continue to stir and decolorize for 0.5 hours. After filtering, the filtrate is slowly cooled and crystallized to obtain 2507.4 g of white crystals, with a yield of 90.02%, mp: 202°C (document mp: 204°C) mother liquor is recovered and cooled to obtain crude Lomerizine hydrochloride, which can increase the yield.

[0022] Take 1950.3g of crude Lomerizine Hydrochloride and add 7000ml of acetonitrile-methanol (80%-20%) mixed solution, stir and heat for 1 hour, cool and filter to obtain ...

Example Embodiment

[0023] Example 2:

[0024] Put 1020g of 2,3,4-trimethoxybenzaldehyde and 3750g of bis(4-fluorophenyl)methylpiperazine into the reaction flask and slowly melt it in an oil bath at 100°C. After melting is complete, slowly add 260ml of formic acid dropwise. After dripping, continue to stir and react at this temperature for 3 hours, cool to room temperature, add 960ml of concentrated hydrochloric acid (37%) and 9600ml of absolute ethanol and stir and reflux for 5 hours, then add 90g of activated carbon, and continue to stir and decolorize for 1 hour. After filtering, the filtrate was slowly cooled and crystallized to obtain 2548.6 g of white crystals with a yield of 91.5%, mp: 202°C (document mp: 204°C).

[0025] Take 1950.3 g of crude Lomerizine hydrochloride and add 7000 ml of acetonitrile-ethanol (80%-20%) mixed solution, heat for 1 hour with stirring, cool and filter to obtain white crystals, and dry to obtain 1057.7 g of refined products. The yield is 54.23%, mp: 207.8-208.9°C.

...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

This invention synthesis process consists of steps: (1) 2,3,4-trimethoxy benzaldehyde and di(4-fluorobenzyl) methyl piperazne, in molar ratio of (1:1) to (1:2.5) are fed in, heating to melt; (2) dropping-in formic acid, in mole ratio of (1:1) to 2,3,4-trimethoxy benzaldehyde, reacting for 1-3 hrs; (3) after cooled, adding concentrate hydrochloride acid-anhydrous alcohole mixed solution reacting for 1-5 hrs, to obtain crude product; (4) recrystallization of said product, by adding acetonitrile-methanol mixed solution or acetonitrile-ethanol mixed solution, refluxing for 1 hr. to obtain the final product. Advantages are: no need of salification, directly to obtain final product, high yield (more than 80%), to obtain pharmaceutical product after recrystallization, commercial (ton-scale) prodn.

Description

technical field [0001] The invention relates to a method for synthesizing lomerizine hydrochloride (1-(2,3,4-trimethoxybenzyl)-4-[bis(4-fluorophenyl)methyl]piperazine dihydrochloride) method. Background technique [0002] Migraine is a common chronic recurrent unilateral headache. my country is an area with a high incidence of migraine. Lomerizine hydrochloride (Lomerizine hydrochloride) is a new type of diphenylpiperazine calcium channel blocker, it can selectively increase the blood flow of cerebral blood vessels with little effect on peripheral blood vessels, and can also inhibit the diffusion inhibition ( Spreadingdepression) and neuritis, protect people and animals from the damage of cerebral ischemia and hypoxia, so developing lomerizine hydrochloride to treat migraine has broad market prospect. In view of the obvious economic and social benefits of lomerizine hydrochloride, many different synthetic methods have been developed. Although there are many methods for s...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C07D295/096
Inventor 李强朱月刘彩连唐平曹富陈慧
Owner NANJING CHANGAO PHARMA SCI & TECH CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap