Preparation method for zaleplon

A technology of zaleplon and aminoacetophenone, which is applied in the field of preparation of zaleplon, can solve the problems of difficult mass production, large amount of dimethyl acetal, cumbersome operation, etc., and achieve low production cost and high yield , the effect of simple operation

Inactive Publication Date: 2012-07-18
蚌埠丰原涂山制药有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The amount of N,N-dimethylformamide dimethyl acetal consumed in the second step is large, and the reaction produc...

Method used

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  • Preparation method for zaleplon

Examples

Experimental program
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Effect test

Embodiment 1

[0040] 1, the preparation of 3-(N-acetyl) aminoacetophenone:

[0041] Add 162.19g of 3-aminoacetophenone and 135.11g of acetic acid into the flask and stir, add 144.97g of acetic anhydride, the reaction generates heat, and the solid dissolves. After stirring for 50 minutes, place it at 0°C for 4 hours, add about 600ml of water to wash the product, and filter , and the solid was vacuum-dried at 50° C. to obtain 192.9 g of a white solid product 3-(N-acetyl)aminoacetophenone, with a yield of 91%.

[0042] 2. Preparation of 3-(N-ethyl-N-acetylamino)acetophenone:

[0043] Add 192.9g of 3-(N-acetyl)aminoacetophenone and 2340ml of acetone into the bottle and stir, then add 347.8g of ethyl iodide, adjust the pH value to 7.5 with 55% KOH aqueous solution, heat and reflux for 3.5 hours, evaporate to Solvent, add 1170ml water to dissolve the product. Use 1170ml dichloromethane to extract the aqueous solution three times, the extracts are combined, and the dichloromethane is evaporated ...

Embodiment 2

[0051] 1, the preparation of 3-(N-acetyl) aminoacetophenone:

[0052] Add 189.22g of 3-aminoacetophenone and 135.11g of acetic acid into the flask and stir, add 134.76g of acetic anhydride, the reaction generates heat, and the solid dissolves. After stirring for 45 minutes, place it at 3°C ​​for 5 hours, add about 600ml of water to wash the product, and filter , the solid was vacuum-dried at 45° C. to obtain 223.72 g of a white solid product, 3-(N-acetyl)aminoacetophenone, with a yield of 90%.

[0053] 2. Preparation of 3-(N-ethyl-N-acetylamino)acetophenone:

[0054] Add 223.72g of 3-(N-acetyl)aminoacetophenone and 2330ml of acetone into the bottle and stir, then add 393.04g of ethyl iodide, adjust the pH value to 8 with 60% KOH aqueous solution, heat and reflux for 4 hours, evaporate to Solvent, add 1200ml water to dissolve the product. Use 1200ml dichloromethane to extract the aqueous solution three times, the extracts are combined, and the dichloromethane is evaporated un...

Embodiment 3

[0062] 1, the preparation of 3-(N-acetyl) aminoacetophenone:

[0063] Add 175.71g of 3-aminoacetophenone and 138.72g of acetic acid into the flask and stir, add 140.88g of acetic anhydride, the reaction generates heat, and the solid dissolves. After stirring for 55 minutes, place it at 3°C ​​for 3 hours, add about 600ml of water to wash the product, and filter , and the solid was vacuum-dried at 45° C. to obtain 211.93 g of a white solid product, 3-(N-acetyl)aminoacetophenone, with a yield of 92%.

[0064] 2. Preparation of 3-(N-ethyl-N-acetylamino)acetophenone:

[0065] Add 211.93g of 3-(N-acetyl)aminoacetophenone and 2350ml of acetone into the bottle and stir, then add 379.63g of ethyl iodide, adjust the pH value to 7 with 55% KOH aqueous solution, heat and reflux for 4 hours, evaporate to Solvent, add 1170ml water to dissolve the product. The aqueous solution was extracted three times with 1170ml of dichloromethane, the extracts were combined, and the dichloromethane was ...

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Abstract

The invention relates to a preparation method for zaleplon. The method comprises the following steps of: (1) making 3-aminoacetophenone react with acetic anhydride to obtain 3-(N-acetyl) aminoacetophenone; (2) making 3-(N-acetyl)aminoacetophenone react with iodoethane to obtain 3-(N-ethyln-acetamino) acetophenone; (3) making 3-(N-ethyl-N-acetamino)acetophenone react with N,N-dimethylformamide dimethyl acetal under a refluxing action to obtain N-[3-(3-dimethylamino-1-oxygen-2-allyl-phenyl)]-N-ethyl acetamide; and (4) making N-[3-(3-]dimethylamino-1-oxygen-2-propenyl-phenyl)]-N-ethyl acetamide react with 3-aminopyrazole-4-nitrile to obtain crude zaleplon, and refining to obtain the zaleplon. The preparation method has the advantages of small adding amount of solvent, easiness for operating, capability of saving expensive N,N-dimethylformamide dimethyl acetal, no need of special process conditions, and suitability of mass production.

Description

technical field [0001] The invention relates to the technical field of medicine, in particular to a preparation method of zaleplon. Background technique [0002] Insomnia is a common clinical disease. Benzodiazepine (BZD) drugs are effective in treating insomnia, but they are prone to some adverse reactions such as withdrawal syndrome and residual sedation. Zaleplon is a new type of non-BZD hypnotics. It is a selective ω1 receptor agonist and has some pharmacological properties of BZD drugs. It has sedative hypnotic, muscle relaxation, anxiolytic and anticonvulsant effects. It is characterized by fast onset of action, can significantly shorten the waiting time before falling asleep, short half-life, light sequelae, little effect of inducing sensory impairment, and good safety. As a short-acting treatment for insomnia in adults. [0003] Zaleplon, whose trade name is Sonata, was developed by AHP in the United States and first launched in Denmark and Sweden in July 1999 for ...

Claims

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Application Information

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IPC IPC(8): C07D487/04
Inventor 马其胜张勇尹群孙鹏朱学娟李保琴
Owner 蚌埠丰原涂山制药有限公司
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