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Synthesis method of lifitegrast intermediate 5,7-dichloro-1,2,3,4-tetrahydroisoquinoline

A technology of tetrahydroisoquinoline and synthetic method, which is applied in the field of medicine and chemical industry, can solve the problems of unsuitability for industrial production, high Friedel-Crafts reaction temperature, and low reaction yield, and achieve mild conditions, readily available raw materials, and simple process route Effect

Pending Publication Date: 2020-04-24
广安凯特制药有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this route is simple, the yield of the first step reaction is low, the overall cost is high and the Friedel-Crafts reaction temperature is very high, so it is not suitable for industrial production

Method used

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  • Synthesis method of lifitegrast intermediate 5,7-dichloro-1,2,3,4-tetrahydroisoquinoline
  • Synthesis method of lifitegrast intermediate 5,7-dichloro-1,2,3,4-tetrahydroisoquinoline
  • Synthesis method of lifitegrast intermediate 5,7-dichloro-1,2,3,4-tetrahydroisoquinoline

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067]

[0068] Add N,N-dimethylformamide (1093.8mL), potassium carbonate (51.8g, 0.375mol), 2,4-dichlorobenzaldehyde (43.8g, 0.25mol) into a four-necked flask, stir, and slowly drop Nitromethane (30.5 g, 0.5 mol) was added, and after the dropwise addition, the temperature was raised to 140° C., and the reaction was stirred for 5 h. After the completion of the reaction as monitored by TLC, the temperature of the reaction solution was slowly cooled to 10-20°C, a large amount of solids precipitated out, cold filtered, the filter cake was washed with water until the effluent was neutral, and a white solid was obtained, which was air-dried at 50-60°C to obtain compound 3 ( 43.8g, molar yield 80.4%, HPLC purity: 99.3%).

[0069] retention time (min) type Peak width (min) Peak area Peak height Peak area ratio% 2.753 BB 0.730 65.5202 9.0161 0.3058 4.162 BB 0.165 0.4704 0.1040 0.0022 5.508 BB 0.302 12.0522 2.6244 0.0562 6.703 B...

Embodiment 2

[0071]

[0072] Add tetrahydrofuran (200mL) and lithium aluminum hydride (15.2g, 0.4mol) in sequence to the three-necked reaction flask, seal the reaction flask, replace with nitrogen three times, cool down to 0-5°C in an ice bath; The tetrahydrofuran solution of compound 3 obtained in Example 1 (compound 3, 43.8 g, 0.2 mol; tetrahydrofuran, 200 mL). After the dropwise addition, keep warm at 0-5°C for 12 hours. TLC monitors that the reaction is complete, add dropwise saturated sodium sulfate solution (100mL) to quench the reaction, filter, and concentrate the filtrate under reduced pressure to remove tetrahydrofuran, add ethyl acetate (200mL), water (100mL), separate layers, and the water layer TLC detects that there is no product, Discarded, the ethyl acetate layer was washed twice with saturated brine (100 mL), and the organic phase was concentrated to dryness under reduced pressure to obtain a brown oily compound 4 (34.7 g, molar yield: 90.9%, HPLC purity: 95.4%).

[00...

Embodiment 3

[0075]

[0076] Add compound 4 (34.7g, 0.18mol) obtained in Example 2, dichloromethane (175mL), triethylamine (45.4g, 0.45mol) to the three-necked flask successively, replace with nitrogen three times, stir in an ice bath, and cool to 0 ~10°C; add acetic anhydride (22.4g, 0.22mol) dropwise, and control the internal temperature to 0~10°C. After the dropwise addition, keep the reaction for 3~5 hours. After TLC monitors the reaction is complete, add 100mL of water to quench, and separate the liquid. The aqueous phase was extracted once with 50 mL of dichloromethane, the organic phases were combined, washed twice with saturated brine (100 mL each time), the organic phase was collected, concentrated to dryness to obtain a white solid, added petroleum ether (60 mL), and beaten at room temperature for 1 h. After filtration, the filter cake was collected and dried under reduced pressure at 45-55°C to obtain a white solid, namely compound 5 (40.3 g, molar yield 95.1%).

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Abstract

The invention discloses a synthesis method of a lifitegrast intermediate 5,7-dichloro-1,2,3,4-tetrahydroisoquinoline, wherein the synthesis method comprises the steps: by using 2,4-dichlorobenzaldehyde as a starting material, carrying out nitro-alcohol condensation elimination, reduction, amino protection, cyclization, deprotection and other reactions to obtain 5,7-dichloro-1,2,3,4-tetrahydroisoquinoline. The synthesis method not only avoids using expensive raw materials, but also is simple in process route, easily available in raw materials, mild in conditions, effectively reduced in production cost and suitable for large-scale production.

Description

technical field [0001] The invention relates to pharmaceutical and chemical technology, in particular to a method for synthesizing 5,7-dichloro-1,2,3,4-tetrahydroisoquinoline, an intermediate of ritazast. Background technique [0002] Litazast lifitegrast is a drug designed and developed by SAR code Bioscience for the treatment of dry eye disease. On July 11, 2016, the FDA approved the drug to be marketed and used for eye dryness syndrome caused by insufficient quantity or poor quality of tears. It is a new inhibitor of intercellular adhesion factor, which can block intercellular adhesion molecules. The binding between -1 and the integrin protein lymphocyte function-associated antigen-1 works. The only other similar drug is cyclosporine, and its clinical application will be more extensive in the near future. [0003] The structural formula is as follows: [0004] [0005] 5,7-dichloro-1,2,3,4-tetrahydroisoquinoline is an important intermediate of ritamilast, and its st...

Claims

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Application Information

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IPC IPC(8): C07D217/02
CPCC07D217/02Y02P20/55
Inventor 周旭东左小勇周福委龙涛梁栋邹鑫
Owner 广安凯特制药有限公司
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