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Synthesis method of dapoxetine hydrochloride

A technology of dapoxetine hydrochloride and a synthesis method, applied in the field of synthesis of dapoxetine hydrochloride, can solve the problems of high production cost, low yield, expensive chiral resolving agent and the like, and achieves the reaction time Short, high product yield, easy post-processing effect

Inactive Publication Date: 2014-03-26
SUZHOU UUGENE BIOPHARMA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] In this synthetic method, not only an expensive chiral resolving agent is used, but also the chiral resolving agent is separated from the enantiomers to obtain intermediates or products of known configuration, resulting in higher production costs and higher yields. lower

Method used

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  • Synthesis method of dapoxetine hydrochloride
  • Synthesis method of dapoxetine hydrochloride
  • Synthesis method of dapoxetine hydrochloride

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Disperse 1300g of (S)-3-amino-3-phenylpropionic acid in 13L of tetrahydrofuran, add 964g of sodium borohydride in 3 batches while stirring under the protection of nitrogen at 10-20°C, and continue stirring to cool down after adding Add 1250g of concentrated sulfuric acid (98%) dropwise at 8°C, and finish the dropwise addition in about 4 hours, then naturally rise to room temperature and stir for 12 hours until TLC detects that the raw material disappears, then slowly add 100mL of methanol at 45°C to quench the reaction and remove Add excess sodium borohydride, then add 20% NaOH aqueous solution to adjust the pH of the reaction solution to 12, heat to reflux for 2 hours, and after cooling to room temperature, extract the reaction solution three times with 10L toluene, combine the toluene layers, and concentrate under reduced pressure to obtain a colorless Oil (S)-3-amino-3-phenylpropanol.

[0039]Dissolve the (S)-3-amino-3-phenylpropanol obtained above in 1.916kg85% form...

Embodiment 2

[0042] Disperse 1400g of (S)-3-amino-3-phenylpropionic acid in 14L of methyl tert-butyl ether, add 1464g of potassium borohydride in 3 batches while stirring under nitrogen protection at 10°C, after the addition is complete Continue to stir and drop 816g of acetic acid when the temperature is lowered to 5°C, and add dropwise in about 4 hours. After the dropping, naturally rise to room temperature and stir for 12 hours until TLC detects that the raw material disappears, then slowly add 120mL of saturated ammonium chloride aqueous solution at 40°C to quench React to remove excess potassium borohydride, then add 20% KOH aqueous solution to adjust the pH of the reaction solution to 12, heat to reflux for 2 hours, and after cooling to room temperature, extract the reaction solution three times with 12L ethyl acetate respectively, after merging the ethyl acetate layers, Concentration under reduced pressure gave (S)-3-amino-3-phenylpropanol as a colorless oil.

[0043] Dissolve the (...

Embodiment 3

[0046] Disperse 1500g of (S)-3-amino-3-phenylpropionic acid in 15L of diethyl ether, add 630g of lithium borohydride in 3 batches while stirring under the protection of nitrogen at 20°C, continue to stir and cool down to 10 Add 1859g of aluminum trichloride at ℃, and finish adding in about 4 hours. After dropping, naturally rise to room temperature and stir for 12 hours until TLC detects that the raw material disappears. Slowly add 100mL of 1N dilute hydrochloric acid at 50℃ to quench the reaction to remove excess lithium borohydride , then add 20% NaOH aqueous solution to adjust the pH of the reaction solution to 13, heat and reflux for 3 hours, and after cooling to room temperature, extract the reaction solution three times with 14L ethyl acetate respectively, after combining the ethyl acetate layers, concentrate under reduced pressure to obtain a colorless oil (S)-3-amino-3-phenylpropanol.

[0047] Dissolve the (S)-3-amino-3-phenylpropanol obtained above in 2.1917kg85% form...

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Abstract

The invention relates to a synthesis method of a dapoxetine hydrochloride, and belongs to the technical field of medicine synthesis. The synthesis method comprises the following steps: dispersing (S)-3-amino-3-phenylpropionic acid in a solvent, adding a reducing agent and an acid for reaction to obtain (S)-3-amino-3-phenylpropanol; dissolving the (S)-3-amino-3-phenylpropanol in formic acid, adding formaldehyde for reaction to obtain (S)-3-dimethylamino-3-phenylpropanol; dissolving the (S)-3-dimethylamino-3-phenylpropanol in an anhydrous solvent, under the protection of nitrogen and in ice bath, adding an alkali and 1-fluorinated naphthalene while stirring, heating up to 90-110 DEG C for reaction for 3 to 5 hours, leading into a dry hydrogen chloride gas to obtain the final product dapoxetine hydrochloride. The synthesis method has the advantages of less steps, simple reaction conditions, simple and practicable post processing, low production cost, high purity and yield, and suitability for industrialized mass production.

Description

technical field [0001] The invention relates to a method for synthesizing dapoxetine hydrochloride, which belongs to the technical field of drug synthesis. Background technique [0002] Dapoxetine hydrochloride, chemical name: (S)-N,N-dimethyl-3-(naphthyl-1-oxyl)-phenylalanine hydrochloride, English name: (S)-N ,N-dimethyl-3-(naphthalen-1-yloxy)-1-phenyl hydrochloride, the chemical structural formula is: [0003] [0004] Dapoxetine hydrochloride (dapoxetine hydrochloride) is a selective serotonin reuptake inhibitor (SSRI) with a short half-life, used to treat premature ejaculation in men. [0005] There are many methods for synthesizing dapoxetine hydrochloride in the prior art. For example, a Chinese patent application (publication number: CN102229538A) discloses a method for synthesizing dapoxetine hydrochloride. The specific reaction formula is: [0006] [0007] This method is solvent with ethanol, with benzaldehyde, malonic acid as raw material, although synthe...

Claims

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Application Information

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IPC IPC(8): C07C217/48C07C213/06
Inventor 胡凡邵长坤李胜陈冠元王伸勇王晓俊胡隽恺
Owner SUZHOU UUGENE BIOPHARMA
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