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Preparation technique of olopatadine hydrochloride

A technology for the preparation of olopatadine hydrochloride and its preparation technology, which is applied in the field of preparation technology of olopatadine hydrochloride, can solve the problems that it is not suitable for industrial production, the proportion of Z-type products is small, and there are many by-products, and the synthesis steps are short, Strong nucleophilicity and the effect of improving the total yield

Active Publication Date: 2016-06-22
SHANDONG LUOXIN PARMACEUTICAL GROUP STOCK CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has many by-products, Z-type products account for a small proportion, and the yield is low, so it is not suitable for industrial production

Method used

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  • Preparation technique of olopatadine hydrochloride
  • Preparation technique of olopatadine hydrochloride
  • Preparation technique of olopatadine hydrochloride

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Embodiment 1: the preparation of isoket acid

[0047] Add 15.11g of p-hydroxyphenylacetic acid (100mmol), 4g of sodium hydroxide (100mmol), and 100ml of ethanol to the reaction flask, stir at room temperature for 1 hour, add 17.06g of 2-(chloromethyl)benzoic acid (100mmol), and heat up to reflux reaction , after the end of the thin-layer monitoring reaction, the solvent was distilled off under reduced pressure, dissolved in 200ml of dichloromethane, washed with water, dried with anhydrous magnesium sulfate, concentrated, added 1% Eaton reagent (mass concentration) 400ml, heated to 80 ° C, stirred for 2 Hours, after the reaction was completed, a saturated sodium carbonate solution was added, suction filtered, and recrystallized from ethanol to obtain 19.53 g of isoket acid (72.8 mmol), with a yield of 72.8% and a HPLC purity of 99.8%.

Embodiment 2

[0048] Embodiment 2: the preparation of isoket acid

[0049]Add 30.23g of p-hydroxyphenylacetic acid (200mmol), 31.80g of sodium carbonate (300mmol), 120ml of isopropanol in the reaction flask, stir at room temperature for 1 hour, add 17.06g of 2-(chloromethyl)benzoic acid (100mmol), and heat up Reflux reaction, thin-layer monitoring After the reaction is over, the solvent is distilled off under reduced pressure, dissolved in 200ml of dichloromethane, washed with water, dried, concentrated, 100ml of 10% Eaton reagent (mass concentration) is added, the temperature is raised to 80°C, stirred for 2 hours, and the reaction After completion, add saturated sodium carbonate solution, filter with suction, and recrystallize from ethanol to obtain 20.52 g of isoket acid (76.5 mmol), with a yield of 76.5% and a purity of 99.3% by HPLC.

Embodiment 3

[0050] Embodiment 3: the preparation of isoxacic acid

[0051] Add 22.67g of p-hydroxyphenylacetic acid (150mmol), 11.22g of potassium hydroxide (200mmol), and 90ml of methanol into the reaction flask, stir at room temperature for 1 hour, add 17.06g of 2-(chloromethyl)benzoic acid (100mmol), and heat up to reflux Reaction, thin-layer monitoring After the reaction is over, distill the solvent off under reduced pressure, add 200ml of dichloromethane to dissolve, wash with water, dry, concentrate, add 200ml of 7.5% Eaton reagent (mass concentration), heat up to 80°C, stir for 2 hours, and the reaction is complete Afterwards, saturated sodium carbonate solution was added, suction filtered, and recrystallized from ethanol to obtain 21.27 g of isoket acid (79.3 mmol), with a yield of 79.3% and a HPLC purity of 99.9%.

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Abstract

The invention relates to a preparation technique of olopatadine hydrochloride. The technique comprises the following steps: carrying out reaction on 2-(chloromethyl)benzoic acid and p-hydroxyphenylacetic acid to generate Isoxepac, and carrying out reaction on the Isoxepac and a Wittig-horner agent generated by N,N-dimethylaminochloropropane hydrochloride to generate hydrochloride, thereby obtaining the olopatadine hydrochloride. The method uses the low-cost raw materials for reaction, avoids using toxic agents in the reaction process, has the advantages of short process route, mild reaction conditions, controllable operation, short production cycle, low energy consumption, high yield, high purity and safe technique, and is suitable for industrial production.

Description

technical field [0001] The invention relates to a preparation process of olopatadine hydrochloride, which belongs to the field of drug synthesis. Background technique [0002] Olopatadine hydrochloride is a selective antagonist of histamine H1 receptors, which is used in the treatment of ocular typical symptoms of seasonal allergic conjunctivitis. It is also used in the symptomatic treatment of allergic rhinitis and allergic urticaria, and in the treatment of eczema and dermatitis. Olopatadine hydrochloride can be administered in solid oral pharmaceutical dosage form or as an ophthalmic solution. Its structural formula is: [0003] [0004] According to existing bibliographical reports, following several synthetic routes are arranged: [0005] Synthetic route 1: Patent WO2011128911. [0006] [0007] Synthetic Route 2: Patent US5116863. [0008] [0009] The above two routes all use isoket acid and [3-(dimethylamino)propyl] triphenylphosphine bromide hydrobromi...

Claims

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Application Information

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IPC IPC(8): C07D313/12
CPCC07D313/12
Inventor 孙松李强李呈龙
Owner SHANDONG LUOXIN PARMACEUTICAL GROUP STOCK CO LTD
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