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A kind of preparation method of multi-substituted bromo-fluorine substituted benzoimidazole compound

A technology of a reaction kettle and a body, applied in the field of pharmaceutical intermediates, can solve the problems of not being able to be promoted, not being able to have a higher yield reaction time, appearing, or having documents or materials published, etc.

Active Publication Date: 2021-07-06
北京六合宁远医药科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN201611006995.8 provides a kind of imidazole benzaldehyde p-phenylenediamine bis-Schiff base and its preparation method, which is an example of the application and synthesis of imidazole derivatives, but the 2,7-dibromo -4-Fluoro-1H-phenyl[d]imidazole rarely has applications or preparation methods as pharmaceutical intermediates, or has literature or information published
[0003] Due to the properties of this molecule, the method cannot be extended to the synthesis of other similar structures
This is determined by the ingenuity of the preparation method, the higher yield and the non-reproducibility of the shorter reaction time obtained from numerous experiments. Other routes basically cannot have higher yield or acceptable reaction time.
[0004] In addition, there is also such a problem in the prior art, that is, the existing four-necked bottle has a significant deficiency as a reaction vessel. Generally, this type of laboratory preparation uses a four-necked bottle as a reaction vessel, and several disadvantages are prominent: one. Insufficient performance, when the mixture in the four-necked bottle needs to be stirred, because the four-necked bottle generally clamps the main bottleneck to achieve high-speed stirring, but the bottom of the four-necked bottle is uneven, so that the stirring rod cannot go deep, and it is difficult to achieve high-speed stirring. The most stable stirring speed is 350-400 rpm. If it is higher, the overall vibration of the device is too severe, and there is a risk of damage to the whole bottle. Due to the uneven bottom of the bottle, the material In many cases, it is also difficult to obtain effective and sufficient stirring, which affects the full progress of the reaction; 2. The deficiency of the existing nitrogen protection method, the existing nitrogen protection is to feed nitrogen from one mouth of the four-necked bottle, and lead the bottle from the other mouth. However, due to the limitation of the shape of the four-necked bottle in this way, a large dead volume or a volume that does not participate in convection will be generated in the bottle. According to infrared video detection, the occurrence of such a dead volume is a high probability event. And the current simple way of nitrogen ventilation is difficult to overcome; 3. The problem of large loss of the reaction mixture, the multiple ports of the four-necked bottle, and the small problem of the main port make it difficult for the reaction mixture to be properly processed during each step. In practice, a large amount or most of them are lost, and often each step will reduce the product quantity by 1-20% due to operational problems, which not only affects the actual product quantity obtained, but also makes the yield of each step The calculation deviates from the actual situation, which cannot be overcome by using the four-necked bottle system
There is also the need for heating and reflux. When the four-necked bottle is heated and refluxed, the condenser tube and the four-necked bottle are rigidly combined, and the gap in the middle cannot be ignored, and the overall device is not well integrated. The center of gravity is biased during high-speed stirring, and the shaking is obvious. , there is a risk of device breakdown
There is another problem. Although in many organic reactions, it is not necessary to heat up to 100°C or boil / reflux, but the boiling point of organic matter is low, and it is more obvious to volatilize above 40°C. When there is less material, it will volatilize. There are many substances, and they cannot directly contact the liquid / substance near the reflux condenser, which is often not easy to condense, and a large amount of them adheres to the wall, especially when there is less material, which has a great impact on the expectation that the reaction will be carried out in proportion as expected

Method used

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  • A kind of preparation method of multi-substituted bromo-fluorine substituted benzoimidazole compound
  • A kind of preparation method of multi-substituted bromo-fluorine substituted benzoimidazole compound
  • A kind of preparation method of multi-substituted bromo-fluorine substituted benzoimidazole compound

Examples

Experimental program
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Effect test

Embodiment 1

[0037] A reaction kettle, which has a body 1 made of glass, the body is equipped with a kettle cover 11, a lower flange 12, and a cylinder body 13. It is characterized in that: the reaction kettle also includes an air inlet combination 2, an air outlet combination 3, and a fixing device 4. Stirring section 5. The reaction kettle has improved the overall problems of the current four-neck bottle system as a whole: it is not stable enough, the contact area at the bottom is small, the heating and cooling are slow, the stirring speed cannot be increased, the nitrogen protection effect is not good, the feeding must be completely opened, and it is very difficult to remove the reaction mixture. Troublesome and difficult to solve the problem.

[0038]The center of kettle lid 11 has middle hole 14, and middle hole 14 is the circular through hole that the center is positioned at kettle lid 11 centers, and its inner side surface is frosted shape, is used for bonding with the peripheral su...

Embodiment 2

[0049] 1) Get a reaction kettle as claimed in claim 2, clean and dry, fix the body 1 on the fixture 4, open the kettle cover 11, add 500ml of water first, then add 21g of hydroxylamine hydrochloride, 113g of sodium sulfate, 20g of 2-bromo-5-fluoroaniline, then add 2N HCl of 25ml, close the lid 11, stir at a speed of 680 rev / min for 10min, slow down to 140 rev / min, and slowly Add 18.1g of chloral hydrate at a speed, put the cooling element 134 on the neck 132 and fix it, pass into normal temperature cooling water from the water inlet pipe at a speed of 80ml / min and draw it out from the water outlet pipe, and heat the system to React at 55°C for 16 hours, remove the cooling element 134 and the water bath, and keep stirring to cool the system to room temperature. The solids to be precipitated will not increase, filter with suction, wash with water, and dry in a vacuum oven to obtain the product (E)-N of step 1. -(2-bromo-5-fluorophenyl)-2-(hydroxylamine)acetamide 17.5 g.

[0050...

Embodiment 3

[0055] 1) Get a reaction kettle as claimed in claim 2, clean and dry, fix the body 1 on the fixture 4, open the kettle cover 11, add 500ml of water first, then add 22g of hydroxylamine hydrochloride, 114g of sodium sulfate, The 2-bromo-5-fluoroaniline of 21g, add the HCl of 2N of 27ml again, close kettle lid 11, stir 10min with the rotating speed of 640 revs / min, slow down to 160 revs / min, slowly through feeding hole 18 Add 18.2g of chloral hydrate at a speed, put the cooling element 134 on the neck 132 and fix it, pass into normal temperature cooling water from the water inlet pipe at a speed of 100ml / min and draw it out from the water outlet pipe, and heat the system to React at 58°C for 17 hours, remove the cooling element 134 and the water bath, and keep stirring to cool the system to room temperature. The solids to be precipitated will basically no longer increase, filter with suction, wash with water, and dry in a vacuum oven to obtain the product (E)-N of step 1. -(2-br...

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Abstract

A method for preparing a multi-substituted bromofluorine-substituted benzoimidazole compound, which is prepared by using a special reaction kettle, the reaction kettle has a glass body (1), the body is equipped with a kettle cover (11), a lower flange (12 ), barrel (13), and the reactor also includes an inlet combination (2), an outlet combination (3), a fixture (4), a stirring portion (5); it is based on 2-bromo-5-fluoroaniline as a synthetic starting point , to obtain (E)-N-(2-bromo-5-fluorophenyl)-2-(hydroxylamine) acetamide, and then prepare 7-bromo-4-fluoroindoline-2,3-dione ; Then through 2-amino-3-bromo-6-fluorobenzoic acid transition; 7-bromo-4-fluoro-1H-phenyl [d] imidazole-2-alcohol; add ethyl acetate and phosphorus oxybromide , to obtain the product 2,7-dibromo-4-fluoro-1H-phenyl[d]imidazole.

Description

technical field [0001] The invention relates to the field of pharmaceutical intermediates, in particular to a synthesis method of the pharmaceutical intermediate 2,7-dibromo-4-fluoro-1H-phenyl[d]imidazole. Background technique [0002] Imidazole and its derivatives are an important class of compounds with strong biological activity and are widely used in medicine, pesticides and other fields. Therefore, the synthesis of imidazole derivatives has received extensive attention, especially in pharmaceutical intermediates. . CN201611006995.8 provides a kind of imidazole benzaldehyde p-phenylenediamine bis-Schiff base and its preparation method, which is an example of the application and synthesis of imidazole derivatives, but the 2,7-dibromo -4-Fluoro-1H-phenyl[d]imidazole rarely has applications or preparation methods as pharmaceutical intermediates, or has literature or information published. [0003] Due to the properties of this molecule, this method cannot be extended to t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J19/18B01J19/00C07D235/24
CPCB01J19/0013B01J19/0066B01J19/18C07D235/24Y02P20/141
Inventor 江勇军
Owner 北京六合宁远医药科技股份有限公司
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