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Synthesizing method for 3'-amino-2'-hydroxy biphenyl-3-carboxylic acid

A technology of hydroxybiphenyl and synthesis method, which is applied in the synthesis of 3'-amino-2'-hydroxybiphenyl-3-carboxylic acid, the key intermediate field of synthesizing Eltrombopag, and can solve the problem of shortening the reaction route and dangerous and other problems, to achieve the effect of novel method, low cost and high yield

Active Publication Date: 2016-07-27
启东东岳药业有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method shortens the reaction route, but debenzylation requires high-pressure operation, which has certain risks

Method used

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  • Synthesizing method for 3'-amino-2'-hydroxy biphenyl-3-carboxylic acid
  • Synthesizing method for 3'-amino-2'-hydroxy biphenyl-3-carboxylic acid
  • Synthesizing method for 3'-amino-2'-hydroxy biphenyl-3-carboxylic acid

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Experimental program
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Effect test

Embodiment 1

[0056] Embodiment 1: the preparation of 2-bromo-6-aminophenol (compound I)

[0057] 15g (68.8mmol) of 2-bromo-6-nitrophenol, 300mL of methanol, stirred and dissolved, added 1.84g (34.4mmol) of ammonium chloride, 19.27g (344mmol) of iron powder were added in batches, after the addition was completed, the temperature was raised to reflux Reacted for 2 hours, TLC detected that the reaction was complete, added saturated sodium bicarbonate to adjust pH = 7-8, filtered, the filtrate was spin-dried, added ethyl acetate and water for extraction, and the organic phase was spin-dried to give 2-bromo-6-aminophenol (compound I ) 11.2g, yield 86.5%.

Embodiment 2

[0058]Embodiment 2: the preparation of 2-bromo-6-aminophenol (compound I)

[0059] 15g (68.8mmol) of 2-bromo-6-nitrophenol, 400mL of methanol, stirred and dissolved, 22.36g (344mmol) of zinc powder was added in batches, after the addition was completed, the temperature was raised to reflux for 3 hours, TLC detected that the reaction was complete, and saturated carbonic acid was added Sodium hydrogen was used to adjust the pH to 7-8, filtered, the filtrate was spin-dried, ethyl acetate and water were added for extraction, and the organic phase was spin-dried to obtain 11.38 g of 2-bromo-6-aminophenol (compound I), with a yield of 88%.

Embodiment 3

[0060] Embodiment 3: the preparation of 2-bromo-6-aminophenol (compound I)

[0061] 15g (68.8mmol) of 2-bromo-6-nitrophenol, 300mL of methanol, and 150mL of glacial acetic acid were stirred and dissolved, and 19.27g (344mmol) of iron powder was added in batches. After the addition was completed, the reaction was carried out at room temperature for 3 hours. The reaction was detected by TLC and filtered. , washed with water, the filtrate was spin-dried, washed with saturated sodium bicarbonate, then washed with saturated brine, and the organic phase was spin-dried to obtain 11.38 g of 2-bromo-6-aminophenol (compound I), with a yield of 88%.

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Abstract

The invention discloses a synthesizing method for 3'-amino-2'-hydroxy biphenyl-3-carboxylic acid.2-bromine-6-nitrophenol serves as a staring material, 2-bromine-6-aminophenol is obtained through a reduction reaction, ring formation and Suzuki coupling are carried out, a hydrolysis reaction is carried out, and 3'-amino-2'-hydroxy biphenyl-3-carboxylic acid is obtained. According to the method, raw materials are easy to obtain, the path is short, and the method is novel, low in cost, high in yield and environmentally friendly. Tests show that the obtained product is reliable in quality, stable in performance and capable of being further used for preparing a thrombopoietin receptor stimulant, namely, eltrombopag olamine.

Description

technical field [0001] The invention relates to the field of medicine and chemical industry, in particular to a method for synthesizing 3'-amino-2'-hydroxybiphenyl-3-carboxylic acid, which is a key intermediate for synthesizing Eltrombopag. Background technique [0002] 3'-Amino-2'-hydroxybiphenyl-3-carboxylic acid, structural formula (IV) [0003] [0004] The chemical name is 3'-amino-2'-hydroxybiphenyl-3-carboxylic acid, which is the key intermediate for the preparation of the thrombopoietin receptor agonist-Eltrombopag. There are many reports on its synthesis method, and the specific Synthetic methods are: [0005] Deng, Bingchu etc. Pyrazolone derivatives as TPOregulators and their preparation, pharmaceutical compositions and use in the treatment of thrombocytopenia: CN, 101481352[P]. Coupling reaction, then palladium carbon and ammonium formate will reduce the nitro group to amino, and finally reflux in hydrobromic acid to demethylate the protecting group. This me...

Claims

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Application Information

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IPC IPC(8): C07C227/20C07C229/52
CPCC07C213/02C07C227/20C07D263/58C07C215/76C07C229/52
Inventor 李亚男潘鹤林禹艳坤龙中柱蔡水洪何婷
Owner 启东东岳药业有限公司
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