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Preparation method of 6-amino-5-fluorine-1-isoindolinone

A technology of isoindolinone and amino group is applied in the field of preparation of indole derivatives, which can solve the problems of harsh reaction conditions, low yield, high toxicity and the like, and achieves the effects of suitable reaction conditions, cost reduction and easy operation.

Active Publication Date: 2013-02-06
SHANXI MEDICAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention mainly aims at the shortcomings of the existing 6-amino-5-fluoro-1-isoindolinone preparation method, which has many steps, harsh reaction conditions, low yield, high toxicity, and cannot be used in industrialized production, etc., and provides a Process is simple, cost is low, the preparation method of 6-amino-5-fluoro-1-isoindolinone that is easy to realize industrialization

Method used

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  • Preparation method of 6-amino-5-fluorine-1-isoindolinone

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Embodiment 1

[0022] A preparation method of 6-amino-5-fluoro-1-isoindolinone, comprising the steps of:

[0023] 1) In a 100mL three-neck flask equipped with a magnetic stirrer, slowly drop 5.0mL of concentrated sulfuric acid into 25mL of methanol dissolved in 5.0g of 4-fluoro-2-methylbenzoic acid, heat to boil and reflux for 5h, stop the reaction, Spin off the solvent under reduced pressure to obtain a solid, dissolve the obtained solid with 100 mL of ethyl acetate to obtain an ethyl acetate solution, wash the ethyl acetate solution with an equal volume of water, saturated sodium bicarbonate solution and saturated brine successively, and dry over anhydrous sodium sulfate After washing the ethyl acetate solution, spin off the solvent to obtain 4.94g of 4-fluoro-2-methylbenzoic acid, the yield of this step is 90.6%; the obtained substance is characterized by mass spectrometry EI-MS (m / z) detection The data is 169.4[M+1] + , indicating that the obtained substance is 4-fluoro-2-methylbenzoic ...

Embodiment 2

[0028] 1) In a 1000mL three-neck flask equipped with a magnetic stirrer, slowly drop 60mL of concentrated sulfuric acid into 600mL of methanol dissolved in 100g of 4-fluoro-2-methylbenzoic acid, heat to boil and reflux for 12h. Stop the reaction, spin off the solvent under reduced pressure, dilute and dissolve with 800mL ethyl acetate, wash with an equal volume of water, saturated sodium bicarbonate solution and saturated brine successively, dry over anhydrous sodium sulfate, and spin off the solvent to obtain 4-fluoro-2 -Toluic acid 100.1g, the yield of this step is 91.8%; the obtained characterization data of the obtained substance detected by mass spectrometry EI-MS (m / z) is 168.9[M+1] + , indicating that the obtained substance is 4-fluoro-2-methylbenzoic acid;

[0029]2) In a 1000mL three-neck flask equipped with a magnetic stirrer, add 120.0g of N-bromosuccinimide and 4.0g of benzoyl peroxide in sequence to dissolve 80.0g of 4-fluoro-2-methylbenzoic acid Methyl ester in ...

Embodiment 3

[0033] 1) In a 5000mL three-necked flask equipped with a magnetic stirrer, slowly drop 300.0mL of concentrated sulfuric acid into 3500mL of methanol dissolved in 300.0g of 4-fluoro-2-methylbenzoic acid, heat and boil under reflux for 15 hours, and stop the reaction , spin off the solvent under reduced pressure to obtain a solid, dissolve the resulting solid with 2000mL ethyl acetate to obtain an ethyl acetate solution, wash the ethyl acetate solution with an equal volume of water, saturated sodium bicarbonate solution and saturated brine successively, and wash the ethyl acetate solution with anhydrous sodium sulfate Dry and wash the ethyl acetate solution, spin off the solvent to obtain 292.8 g of 4-fluoro-2-methylbenzoic acid, the yield of this step is 89.5%; the obtained substance is detected by mass spectrometry EI-MS (m / z) The characterization data is 169.2[M+1] + , indicating that the obtained substance is 4-fluoro-2-methylbenzoic acid;

[0034] 2) In a 5000mL three-neck...

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Abstract

The invention provides a preparation method of 6-amino-5-fluorine-1-isoindolinone, which comprises the steps of taking 4-fluorine-2-methyl benzoic acid as a raw material, obtaining 5-fluorine-1-isoindolinone through esterification, bromination and cyclization, and obtaining 6-amino-5-fluorine-1-isoindolinone by nitrating and reducing the 5-fluorine-1-isoindolinone. According to the preparation method, the synthetic route is simple, the operation is easy, raw materials are cheap and easy to obtain, the reaction condition is mild, intermediates and products are easy to separate, the productivity is higher, and the preparation method is suitable for industrialized production. The prepared 6-amino-5-fluorine-1-isoindolinone pharmaceutical intermediate has a wide application value in pharmaceutical chemicals, biological a cancer fighting and antibiosis, pesticides and the like.

Description

technical field [0001] The invention belongs to the technical field of preparation methods of indole derivatives, in particular to a preparation method of 6-amino-5-fluoro-1-isoindolinone. Background technique [0002] Indole compounds are a very important class of heterocyclic compounds, widely used in medicine, pesticides, spices, food, feed additives, dyes and other fields. Isoindolinone derivatives have shown their unique advantages in antibiotics, enzyme activators, tumor suppressors, etc. due to their special structure. Many isoindolinone derivatives have been developed and successfully applied in the field of biomedicine. In the preparation process of the target drug, the synthesis of intermediate compounds with multiple active functional groups is a very important link. Therefore, from the perspective of drug design and preparation, it is very desirable to obtain a simple, efficient, easy-to-operate and industrialized synthetic route, and it is also the direction o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D209/46
Inventor 刁海鹏刘文冯丽恒解军
Owner SHANXI MEDICAL UNIV
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