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Synthesis, separation-purification, and salt forming method of dapoxetine

A technology of dapoxetine and salt formation, which is applied in the field of gradient separation, purification and salt formation, and the synthesis of dapoxetine, which can solve problems such as difficult control of sources or by-products, non-synthetic methods, long synthetic routes, etc., to achieve Promote safety and operability, improve feasibility and safety, and effect of short synthetic route

Inactive Publication Date: 2017-05-31
LIAOCHENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0023] 5. Using cinnamate as raw material, classic reactions such as Sharpless asymmetric dihydroxylation, Barton-McCombie deoxygenation and Mitsunobu, etc., but the steps are lengthy and the operation is cumbersome
[0026] Among these routes, most of the synthetic routes used are relatively long, and there are problems such as highly toxic raw materials, explosives, sources or by-products that are difficult to control, which is not an ideal synthetic method and needs further improvement.

Method used

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  • Synthesis, separation-purification, and salt forming method of dapoxetine
  • Synthesis, separation-purification, and salt forming method of dapoxetine
  • Synthesis, separation-purification, and salt forming method of dapoxetine

Examples

Experimental program
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Effect test

Embodiment 1

[0056] Embodiment 1: a kind of preparation method of dapoxetine comprises the following steps:

[0057] Step (1) React benzaldehyde, malonic acid and ammonium acetate in an anhydrous ethanol solvent at 75-85°C (preferably 78°C). After the reaction is complete, let it stand and cool, and filter it to obtain a white solid 3-amino-3- Phenylpropionic acid (Formula 2);

[0058] Step (2) 3-Amino-3-phenylpropionic acid, NaBH 4 Dissolve in tetrahydrofuran solvent, under ice bath condition, temperature control 0°C-10°C, slowly drop into iodine solution, after the reaction is complete, quench, evaporate the solvent under reduced pressure, treat with alkaline substances, and obtain the reduced product after extraction 3-Amino-3-phenylpropanol (Formula 3);

[0059] Step (3) Dissolve the reduction product 3-amino-3-phenylpropanol in formic acid solvent, then add formaldehyde solution, reflux at 85°C-95°C, treat with alkaline substances after the reaction is complete, and obtain the key i...

Embodiment 2

[0064] Embodiment 2: a kind of preparation method of dapoxetine, the steps are as follows:

[0065] At 75-85°C (preferably 78°C), with absolute ethanol as the solvent, add benzaldehyde, malonic acid, ammonium acetate in sequence (benzaldehyde:malonic acid:ammonium acetate is 1:1.0-1.5:1.0-1.5 moles ratio), after the reaction is complete, cool to room temperature, and filter with suction to obtain 3-amino-3-phenylpropionic acid as a white solid.

[0066] Under ice-bath conditions, sodium borohydride and 3-amino-3-phenylpropionic acid were dissolved in THF solvent, and iodine solution dissolved in THF (3-amino-3-phenylpropionic acid: boron Sodium hydride: iodine is 1:1.0-1.5:1.0-1.5 molar ratio), keep the temperature of the reaction solution not higher than 10°C, after the gas is completely released, reflux at 62°C-68°C (preferably 65°C), after the reaction is complete , quenched with anhydrous methanol, evaporated to remove the solvent, added 40% sodium hydroxide or potassium ...

Embodiment 3

[0074] Embodiment 3: a kind of preparation method of dapoxetine, the steps are:

[0075] In a 250 ml three-necked flask, use 140 ml of absolute ethanol as a solvent, add 22.13 g of malonic acid (0.21 mol), 16.35 g of ammonium acetate (0.21 mol), and 15.0 g of benzaldehyde (0.14 mol), and control the temperature at 78°C , Condensed and refluxed, reacted for 6h, monitored by TLC, showed that there was no raw material, after the reaction was completed, cooled to room temperature, filtered, washed with absolute ethanol to obtain 16.0 g of white solid 3-amino-3-phenylpropionic acid, mp 213.0 -213.6℃, ​​MS m / z:166[M+H] + .

[0076]Under ice bath conditions, add 1.38 g (0.036 mol) of sodium borohydride, 4 g (0.024 mol) of the compound 3-amino-3-phenylpropionic acid and THF (65 ml) into a 250 ml three-necked flask, and stir After 10 min, slowly add iodine (6.16 g, 0.024 mol) dissolved in THF (30 ml) dropwise from the constant pressure dropping funnel, keep the temperature of the rea...

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PUM

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Abstract

The invention provides a novel synthesis, gradient separation-purification, and salt forming method of dapoxetine. Easily available and cheap benzaldehyde is taken as the primary raw material of the synthesis route. The whole reaction conditions are mild. The synthesis route is short. No highly toxic or explosive raw material is used. The problem of chiral separation is well solved in the route. During the separation process, the product is purified. Finally, chlorinated hydromethyl tert-butyl ether which does not have any side or toxic effect is used to carry out salt forming. A large amount of labor, material, and time is saved. The production cost is reduced. The synthesis does not need any special equipment. The operation is simple and convenient. The method has a good industrial application prospect.

Description

technical field [0001] The invention belongs to the technical field of medicinal chemistry, and in particular relates to a method for the synthesis, gradient separation and purification and salt formation of dapoxetine. Background technique [0002] The chemical name of dapoxetine is (S)-N,N-dimethyl-3-(naphthyl-1-oxyl)-amphetamine hydrochloride. The English name is: (S)-N, N-dimethyl-3-(naphthalen-1-yloxy)-1-phenyl propan-1-aminehydrochloride. [0003] Chemical Structure: [0004] [0005] Molecular formula: C 21 h 23 NO.HCl; molecular weight: 341.88; CAS number: [129938-20-1]; ([119356-77-3] is unsalted dapoxetine, molecular weight 305.4134); chemical purity: ≥98.5%; optical purity: ≥98.5% [0006] Mp: 175-177℃; Optical rotation: +128°±3(C=1, CH 3 OH). [0007] Dapoxetine is a selective serotonin reuptake inhibitor (SSRI), which is widely used to treat depression and related affective disorders, as well as premature ejaculation (PE) problems in men, and has achie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C213/08C07C213/10C07C213/06C07C217/48
CPCC07C213/08C07B2200/07C07C213/00C07C213/06C07C213/10C07C227/10C07C217/48C07C215/28C07C229/34
Inventor 孙彬李腾
Owner LIAOCHENG UNIV
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