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Substituted benzyl ester and its preparation process and novel process for preparing substituted mopipe therefrom

A compound, piperidinyl technology, applied in the field of pharmaceutical chemical synthesis, can solve the problems of harsh storage conditions and inconvenient large-scale production, and achieve the effect of shortening the synthesis steps, reducing the synthesis cost and mild synthesis reaction conditions

Active Publication Date: 2008-04-23
天津泰普制药有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method solves the technical difficulty that industrialized production cannot be realized in method 1, but the disadvantage is that diisopropylamide lithium must be used as an alkalizing reagent in the reaction preparation process of the alkylation, and it needs to be prepared at low temperature (-40°C) and absolutely without Operate under water conditions. At present, lithium diisopropylamide is not produced by any domestic manufacturers, and this substance is a strong alkaline compound with strong corrosiveness. It must be stored under nitrogen protection at low temperature and in airtight storage. The storage conditions are relatively harsh. Therefore, the operation of this step reaction is not convenient for large-scale production in the future

Method used

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  • Substituted benzyl ester and its preparation process and novel process for preparing substituted mopipe therefrom
  • Substituted benzyl ester and its preparation process and novel process for preparing substituted mopipe therefrom
  • Substituted benzyl ester and its preparation process and novel process for preparing substituted mopipe therefrom

Examples

Experimental program
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preparation example 1

[0032] 1. Preparation example 1: Preparation of (S)-2-halomethylphenylpropionyl-glycine benzyl ester

[0033] 1, Preparation of 3-hydroxyl-2-methenyl-3-phenylpropionic acid methyl ester

[0034] Add 67.3g of benzaldehyde, 60ml of methyl acrylate, and 13.5g of triethylenediamine into a 500ml reaction bottle, stir at room temperature for 5 days, add 60ml of water, 60ml of concentrated hydrochloric acid, and 120ml of ethyl acetate. layer, the organic layer was washed twice with 20ml of water, the organic layer was dried with anhydrous magnesium sulfate, filtered, and the filtrate was concentrated under reduced pressure to obtain 110.5 g of light yellow oil, which was distilled under reduced pressure to collect fractions at 85-90°C / 7-9mmHg. 97.5 g of colorless liquid was obtained, the content was greater than 98% (GC method), and the yield was 80%.

[0035] 2, Preparation of 2-hydroxymethylbenzeneacrylic acid

[0036] Dissolve 60g of 3-hydroxy-2-methenyl-3-phenylpropionic acid m...

preparation example 2

[0053] Two, Preparation Example 2: Preparation of (+)-3R, 4R-(3-hydroxyphenyl)-3,4-dimethylpiperidine

[0054] 1, the preparation of 1,3-dimethyl-4-(3-isopropoxyphenyl)-4-hydroxypiperidine

[0055] Under the condition of nitrogen protection, 60g of 3-bromocymene was added to 150ml of THF, cooled to -72°C, and 150ml of n-butyllithium (2.5M) was slowly added dropwise. After dropping, stir at -60--70°C for 1 hour. Then 30 g of 1,3-dimethyl-4-piperidone was added dropwise, the reaction temperature was kept at about -60--70°C, and stirred for 1 hour. Add 6N hydrochloric acid to the reaction solution under stirring, adjust the pH to 1-2, separate the water layer, adjust the pH to 12 with 20% sodium hydroxide, extract with ethyl acetate three times, combine the organic layers, and dry over anhydrous sodium sulfate overnight. After filtration, the filtrate was concentrated to dryness under reduced pressure, and recrystallized from n-heptane. After filtering, the product was dried ...

Embodiment 1

[0070] 1. (+)-(3R,4R)-[[2S-[[4-(3-hydroxyphenyl)-3,4-dimethyl-1-piperidinyl]methyl]-1-oxo - Preparation of 3-phenylpropyl]amino]acetic acid-4'-bromobenzyl ester

[0071] Method A:

[0072] 10g (+)-3R, 4R-(3-hydroxyphenyl)-3,4-dimethylpiperidine, 25.9g (S)-2-methylsulfonylmethylphenylpropionyl-4'-bromo -benzyl glycine, the Virahol of 300ml, the potassium carbonate of 9.6g, the potassium iodide of 0.1g was added in the three-necked reaction flask of 500ml, heated and refluxed for 8 hours, and the TCL method detected that the basic reaction of the reaction raw materials was complete (R f value is about 0.4, ethyl acetate / petroleum ether=1 / 1.5), cooled to room temperature, filtered, and concentrated under reduced pressure to obtain about 28.2 g of yellow oil. The content of the prepared product is about 80.4% (HPLC method), and the yield is 78.6%. It can be directly put into the next step for reaction.

[0073] Take 1 gram of oily matter and pass through column separation and ...

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Abstract

The invention discloses a (+)-(3R,4R)-[[2S-[[4-(3-hydroxyphenyl-3,4- dimethyl-1-nipecotic)-methyl]-1-oxo-3-phenylpropyl]amido]benzyl cetate compound and its process for preparing and a new technology for preparation of Mope by the said compound. The new technique of this invention changes the 'one chain' synthesis of the original patent method to the separate 'two chains' preparation, by which the total compound steps are dramatically shortened, the compound cost is reduced to about one-half of the original patent method, and the method is more competitive on the market in price. Furthermore,the reaction condition is moderate, the operating procedure is simple, each reaction step is no need of given condition such as low temperature and absolute water-free, so it is more suitable for industrial production.

Description

technical field [0001] The present invention relates to the technical field of pharmaceutical chemical synthesis, more specifically (+)-(3R, 4R)-[[2S-[[4-(3-hydroxyphenyl-3,4-dimethyl-1-piper Pyridyl)-methyl]-1-oxo-3-phenylpropyl]amino]acetic acid substituted benzyl ester compound, a preparation method thereof and a new process for preparing avemopi from the compound. Background technique [0002] Avemopan (alvimopan) is a new type of selective opioid receptor antagonist, mainly used in the treatment of postoperative ileus. The preparation method of this product is currently reported to have two methods, the patented method 1 is based on (+)-3R, 4R-(3-hydroxyphenyl)-3,4-dimethylpiperidine, 2-benzyl ethyl acrylate As the starting material, the target compound is prepared through five steps of addition, hydrolysis, carboxylation, chiral column chromatography, and hydrolysis (see patent CN1065455A); the disadvantage of this method is that the reaction products of each step are...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D211/10B01J23/44
Inventor 李祎亮田青松魏文涛朱红星杨胜利周学福瞿虹吴民义
Owner 天津泰普制药有限公司
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