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Preparation method of lacosamide

A lacosamide and amidation reaction technology, which is applied in the preparation of carboxylic acid amide optical isomers, bulk chemical production, organic chemistry, etc., can solve the problem of high cost, complicated operation, and unsatisfactory optical purity of lacosamide. and other problems to achieve the effect of eliminating racemization and improving the overall yield

Active Publication Date: 2012-12-12
YONG GUANG PHARMA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is complicated to operate, the cost is higher, and the total yield is low
[0004] In summary, the existing problems in the preparation of lacosamide are mainly that the optical purity of lacosamide cannot meet the requirements and the yield is low.

Method used

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  • Preparation method of lacosamide
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  • Preparation method of lacosamide

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preparation example Construction

[0028] The invention relates to an improvement of a synthesis method of lacosamide for treating epilepsy and neuropathic pain.

[0029] The specific implementation steps are as follows:

[0030]

[0031] Process 1

[0032] The characteristics of reaction step a in process flow 1 are:

[0033] 1) Solvent selection

[0034] Alcohols (isopropanol, ethanol, methanol, etc.), halogenated alkanes (methylene chloride, chloroform, etc.), pyridine furans (dihydropyridine, tetrahydrofuran, etc.), toluene, dimethyl sulfoxide (DMSO), N, N -Dimethylformamide (DMF) etc. can be used as the reaction solvent, preferably dry dichloromethane as the solvent, after testing, dichloromethane is used as the solvent, the degree of product racemization is significantly reduced, and the boiling point is low, easy to be used remove.

[0035] 2) Choice of temperature

[0036] The present invention starts from the raw materials, and the intermediates and final products of each step have chirality, s...

Embodiment 1

[0063] Synthesis of (R)-N-benzyl-2-N-Boc-amino-3-methoxypropionamide (compound of formula II)

[0064] In the reaction flask, dissolve 10g of (R)-2-N-Boc-amino-3-methoxypropionic acid in 80ml of dry tetrahydrofuran, and control the temperature of the reaction solution at -15~-10°C; at -10~ Add 5.6g isobutyl chloroformate and 6.2g N-methylmorpholine at -5°C, stir for 1.5h, then add benzylamine ( 5.89g) solution, slowly warming up to 25-30°C within 0.5h to react for 2.0h, HPLC method to detect whether the reaction is complete. After the reaction is finished, wash the reaction solution with 80ml of water, 80ml of 1mol / L hydrochloric acid, 80ml of saturated sodium bicarbonate solution and 80ml of water successively, separate the lower organic phase and concentrate to dryness to obtain an oil, then add 80ml of diethyl ether: n-hexane=1 : 1 mixed solvent, cooled and stirred in ice water, crystallized, and suction filtered to obtain 9.2 g of white powdery solid, with a yield of 86.0...

Embodiment 2

[0066] Synthesis of (R)-N-benzyl-2-N-Boc-amino-3-methoxypropionamide (compound of formula II)

[0067] In the reaction flask, dissolve 10g of (R)-2-N-Boc-amino-3-methoxypropionic acid in 80ml of dry dichloromethane, and control the temperature of the reaction solution at -15~-10°C; Add 5.6g of isobutyl chloroformate and 6.2g of N-methylmorpholine at 10~-5℃, stir for 1.5h, then add 20ml of dichloromethane dissolved in 20ml of dichloromethane dropwise at -15~-10℃ into the reaction bottle benzylamine (5.89g) solution, slowly warming up to 25-30°C within 0.5h to react for 2.0h, and HPLC was used to detect whether the reaction was complete. After the reaction is finished, wash the reaction solution with 80ml of water, 80ml of 1mol / L hydrochloric acid, 80ml of saturated sodium bicarbonate solution and 80ml of water successively, separate the lower organic phase and concentrate to dryness to obtain an oil, then add 80ml of diethyl ether: n-hexane=1 : 1 mixed solvent, cooled and stir...

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Abstract

The invention discloses a preparation method of (R)-2-acetamido-N-benzyl-3-methoxypropionamide (lacosamide). The method provided by the invention increases the purity and yield of lacosamide through controlling the temperature condition of each step and has the advantages of rational route, simple process operation and definite condition control.

Description

technical field [0001] The invention relates to a preparation method of lacosamide for treating epilepsy and neuropathic pain, in particular to an improved preparation method of lacosamide with improved purity and yield. Background technique [0002] Lacosamide (lacosamide), chemically named (R)-2-acetamido-N-benzyl-3-methoxypropionamide, is a new type of N-methyl-D-aspartic acid developed by UCB Company in Belgium Acid receptor glycine binding site antagonist, clinically mainly used for adjuvant treatment of diabetic neuralgia and partial seizures in adult epilepsy patients. This strain is a new type of functional amino acid anticonvulsant drug, which has dual anticonvulsant effects, can selectively promote the slow inactivation of sodium ion channels, and regulate the collapse response mediator protein, thereby delaying or even preventing epileptic seizures and reducing diabetic neuropathic pain. Lacosamide was approved for marketing in the European Union and the United S...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C237/22C07C231/16
CPCY02P20/55
Inventor 刘忠锋张秀生苏忆君蔡佩珍
Owner YONG GUANG PHARMA
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