Method for synthesizing high-purity non-steroidal anti-inflammatory drug loxoprofen sodium

A technology of loxoprofen sodium and a synthesis method, which can be applied to only fields, can solve problems such as being unsuitable for large-scale industrial production, high risk, difficult preparation, etc., and achieves that the purification method is simple and easy to operate, less by-products, and easy to synthesize steps. control effect

Inactive Publication Date: 2018-08-24
大桐制药(中国)有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The 2-(4-iodomethylphenyl) ethyl propionate that needs to be used is difficult to prepare, and a strong base n-butyllithium is used, so it is not su

Method used

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  • Method for synthesizing high-purity non-steroidal anti-inflammatory drug loxoprofen sodium
  • Method for synthesizing high-purity non-steroidal anti-inflammatory drug loxoprofen sodium
  • Method for synthesizing high-purity non-steroidal anti-inflammatory drug loxoprofen sodium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Synthesis of methyl 2-(4-bromomethylphenyl)propionate b

[0041] The reaction formula is as follows:

[0042]

[0043] Add 375ml of methanol to 1000ml of fresh toluene, slowly add 136g of concentrated sulfuric acid under stirring, the system has exotherm, keep at 35°C, then add 250g of raw material a to the reaction system, react at 281°C for 5h, detect the residue of raw material a by HPLC 0.01%, the reaction is finished, cooling the reaction solution, separating the organic layer, washing with 500ml of water, then adding 500ml of water, adding 5.5g of sodium carbonate under stirring to adjust the pH of the system to 13.5, separating the organic layer, washing with 500×2ml of water, The organic layer was dried with 25 g of anhydrous magnesium sulfate for 2 hours; the magnesium sulfate was filtered off and then concentrated under reduced pressure, a total of about 720 g of toluene was recovered, and the residue was orange-yellow transparent oil 2-(4-bromomethylphenyl...

Embodiment 2

[0053] Synthesis of intermediate compound c

[0054] The reaction formula is as follows:

[0055]

[0056] 211 g of dimethyl adipate (DMA) and 71 g of DMSO were added to 870 ml of toluene, stirred and cooled to 2°C. Add 211g of 28% sodium methoxide methanol solution dropwise to the solution, control the dropping temperature not higher than 5°C, and finish the drop within about 1 hour; after the drop is finished, react at low temperature for 30 minutes, heat up, and concentrate at normal pressure to a system temperature of 112.5°C Stop; cool the reaction solution to 60°C, add 312ml of DMF, cool to 5°C, add 260g of 2-(4-bromomethylphenyl) methyl propionate b dropwise to the reaction solution, and maintain the temperature at 10°C during the dropping process; React at 18°C ​​after dropping; after the reaction is complete (based on the disappearance of point b of methyl 2-(4-bromomethylphenyl) propionate detected by TLC), add 390ml of water and 375ml of toluene, and stir at 47°...

Embodiment 3

[0065] Synthesis of loxoprofen acid d

[0066] The reaction formula is as follows:

[0067]

[0068] Add 92g of compound c to the reaction flask, add 168ml of acetic acid and 108ml of water, add 48.8g of concentrated sulfuric acid, heat with a heating mantle, concentrate at normal pressure, after heating up to 110°C, maintain 110°C for reaction, and heat up to the reaction time for a total of 2h; Cool down to below 40°C, react under reduced pressure, the reaction temperature is 55°C, the reaction time is 4.5h, the reaction process is detected by HPLC, the compound c remains 0.07%, the reaction is over; after the reaction is completed, add 96ml of toluene and 96ml of water, stir and extract, after standing The organic layer is on the upper floor, separates the organic layer, washes with 150ml of water and separates the layers, adds 100ml of water to the organic layer, washes the organic layer with 5% sodium hydroxide solution to pH 5.4 (with NaOH solution 8.5g) under stirrin...

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Abstract

The invention discloses a method for synthesizing high-purity non-steroidal anti-inflammatory drug loxoprofen sodium, 2-(4-bromomethylphenyl) methyl propionate b is synthesized by esterification of raw material a and methanol, intermediate compound c and loxoprofen acid are synthesize sequentially, and the loxoprofen sodium is finally synthesized. The reaction mechanism is simple, by-products arefew, synthesis steps are easy to control, the raw material is easily available, and the impurity content of each step is strictly controlled. The purifying method is easy to operate and suitable for industrial production. The white flake crystal loxoprofen sodium is prepared. Finally, HPLC analysis shows that the loxoprofen sodium content detected by HPLC is as high as 99.95%.

Description

technical field [0001] The invention belongs to the technical field, and in particular relates to a method for synthesizing high-purity non-steroidal anti-inflammatory drug loxoprofen sodium. Background technique [0002] Loxoprofen sodium belongs to the phenylpropionic acid non-steroidal anti-inflammatory drug, which was first developed by Sankyo Co., Ltd. in Japan. Now it is the first-selling variety of non-steroidal anti-inflammatory drugs in Japan, and it has been recorded by the Japanese Pharmacopoeia. has been imported. Compared with similar clinical drugs, loxoprofen sodium has the following characteristics: stronger (good clinical effect), faster (the plasma concentration reaches the peak within 30 minutes after oral administration), and safer (less side effects). The other feature is that it has a wide range of indications, and can be widely used clinically for anti-inflammatory and analgesic treatment of rheumatoid arthritis, low back pain, frozen shoulder, neck, ...

Claims

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Application Information

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IPC IPC(8): C07C51/41C07C59/86
CPCC07C51/09C07C51/412C07C67/08C07C67/343C07C2601/08C07C69/65C07C69/757C07C59/86
Inventor 张艳华张媛张荣玉
Owner 大桐制药(中国)有限责任公司
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