CN111269185A - Benzimidazole based on dicarboxylic acid and preparation and application thereof - Google Patents

Benzimidazole based on dicarboxylic acid and preparation and application thereof Download PDF

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CN111269185A
CN111269185A CN201811480165.8A CN201811480165A CN111269185A CN 111269185 A CN111269185 A CN 111269185A CN 201811480165 A CN201811480165 A CN 201811480165A CN 111269185 A CN111269185 A CN 111269185A
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高启合
晏礼明
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Abstract

The invention provides a binary carboxylic acid-based benzimidazole and a preparation method and application thereof, wherein the binary carboxylic acid-based benzimidazole has the following structural general formula:

Description

Benzimidazole based on dicarboxylic acid and preparation and application thereof
Technical Field
The invention belongs to the field of organic chemistry, and particularly relates to carboxyl benzimidazole and a preparation method and application thereof.
Background
The benzimidazole compound is a heterocyclic compound containing two nitrogen atoms, and the structural formula of the compound is as follows:
Figure BDA0001893175960000011
the structure can form hydrogen bond with enzyme and receptor in organism, coordinate with metal ion, and generate hydrophobic-hydrophobic and pi-pi interaction, so it has multiple biological physiological activities. The benzimidazole and the derivative thereof have pharmacological effects of expelling parasites, sterilizing, resisting cancers and the like, and are widely applied to the fields of high-energy density compounds, high-performance composite materials, metal corrosion prevention, photosensitive fluorescent materials and the like. Especially in the medical field: as histamine receptor antagonists, proton pump inhibitors, antihypertensive agents, antiparasitic agents, antibacterial agents, antifungal agents, antiviral agents, anticancer agents, analgesic agents, etc., they also exhibit excellent effects in terms of anti-inflammatory agents, analgesic agents, enzyme inhibitors, antispasmodic agents, receptor agonists, etc. The research and development of novel benzimidazole structural fragment-containing medicines are the key development directions of future benzimidazole medicine research, and through continuous screening, the benzimidazole structural fragment-containing medicines are expected to play an important role in the fields of cancer resistance, AIDS resistance and the like which are relatively troublesome to treat.
Disclosure of Invention
Aiming at the defects in the field, the invention provides benzimidazole based on dicarboxylic acid.
Another object of the present invention is to propose a process for the preparation of said benzimidazoles based on dicarboxylic acids.
A third object of the present invention is to propose the use of said benzimidazoles based on dicarboxylic acids.
The fourth purpose of the invention is to provide a photosensitive fluorescence labeling method.
The technical scheme for realizing the aim of the invention is as follows:
a dicarboxylic acid based benzimidazole having the general structural formula:
Figure BDA0001893175960000021
r is a saturated or unsaturated carbon chain with 2-18 carbon atoms.
A preparation method of benzimidazole based on dicarboxylic acid comprises the steps of carrying out dehydration condensation reaction on o-phenylenediamine (OPD) and dicarboxylic acid, wherein the dicarboxylic acid is saturated or unsaturated dicarboxylic acid with 2-18 carbon atoms; preferably, the carboxylic acid is a saturated dicarboxylic acid having 10 to 18 carbon atoms.
Based on the technical scheme of the invention, the series of benzimidazole derivatives containing the free carboxyl long-chain fatty carboxyl can be prepared by using long-chain dibasic acids such as tridecanedioic acid, tetradecanedioic acid, pentadecanedioic acid, hexadecanedioic acid, heptadecanedioic acid, octadecanedioic acid and the like.
Further, the preparation method comprises the following steps:
1) mixing o-phenylenediamine and dicarboxylic acid, and performing reflux reaction by using 1-6 mol/L HCl solution as a solvent and a catalyst of a reaction system.
2) After the reaction is finished, separating and purifying.
Wherein the mass ratio of the o-phenylenediamine (OPD) to the dicarboxylic acid is 0.1-2.
Wherein the mass-volume ratio of the o-phenylenediamine (OPD) to the HCl solution is 10 g: (100-300) mL.
Preferably, in the step 1), the reflux reaction is carried out for 3-24 hours. When the dicarboxylic acid is an unsaturated dicarboxylic acid, the reflux reaction is carried out under the protection of an inert gas (such as nitrogen or argon).
Wherein the step 2) is as follows: after the reaction is finished, carrying out suction filtration to obtain a solid filter cake, washing the solid filter cake with NaOH solution until the pH of the eluate is 7-8, and finishing washing; filtering to obtain a filter cake, and drying the filter cake.
The application of the benzimidazole based on the dicarboxylic acid is applied to insect expelling, sterilization, preparation of anti-cancer drugs, preparation of high-performance composite materials, metal corrosion prevention and photosensitive fluorescence labeling.
A method of photoluminescing a fluorescent label comprising the acts of:
s1: coupling the activated carboxyl with free amino of lysine in bovine serum albumin to form a bovine serum albumin solution with a fluorescent marker;
s2: dissolving the binary carboxylic acid-based benzimidazole of claim 1 in acetone, adding Dicyclohexylcarbodiimide (DCC) in an equal amount, shaking at room temperature, gradually adding dropwise the solution into the bovine serum albumin solution prepared in step S1, and reacting at 0-5 ℃;
s3: after the reaction is finished, the washing product is concentrated by a centrifugal ultrafiltration membrane and then is freeze-dried to obtain the bovine serum albumin with the fluorescent label.
Preferably, step S2 is: dissolving 2- (1-carboxyl n-decane) benzimidazole in acetone, wherein the mass volume ratio of the 2- (1-carboxyl n-decane) benzimidazole to the acetone is (0.01-0.2) g: 10 mL; adding Dicyclohexylcarbodiimide (DCC) with the same amount of substances, and shaking at room temperature to obtain a labeling solution; and (3) dropwise adding the marking solution into the bovine serum albumin solution according to the volume ratio of the marking solution to the bovine serum albumin solution of 1 (3-6), and reacting for 1-3 hours at 4 ℃.
The beneficial technical effects of the invention are embodied in the following aspects:
the long-chain dibasic acid is an important chemical intermediate, and large-scale industrial production is realized. Polyanhydrides are becoming more and more widely used as downstream derivatives in the medical field. A series of different perfumes can be synthesized by using dibasic acid with more than ten carbons as raw material. Moschus synthesized from thirteen carbon sources can be used as perfume fixative. Pentadecanone, muscone and cyclopentadecanolide can be synthesized from pentadecanoic acid or hexadecanedioic acid. The long-chain dibasic acid has wide application prospect in the field of fine industry such as medical intermediates and the like. The benzimidazole derivative containing the free fatty carboxyl provided by the invention is based on the excellent performance of a benzimidazole parent nucleus and the safety, fat solubility and alkali solubility of long-chain dibasic acid in a living body, and provides wider application for the benzimidazole derivative.
The invention utilizes the 'splicing principle' to prepare the benzimidazole derivative containing the free fatty carboxyl, can be used as a fluorescent probe, can also be used as a novel medicament containing a benzimidazole parent nucleus and (or) an intermediate for downstream development and other fields. In the present invention, 2- (1-carboxy-n-decane) benzimidazole was prepared using dodecanedioic acid. Based on the preparation method provided by the invention, the series of benzimidazole derivatives containing the free carboxyl long-chain fatty carboxyl can also be prepared by using long-chain dibasic acids such as tridecanedioic acid, tetradecanedioic acid, pentadecanedioic acid, hexadecanedioic acid, heptadecanedioic acid, octadecanedioic acid and the like.
Detailed Description
The following examples further illustrate the present invention but are not to be construed as limiting the invention.
Example 1
The preparation method of 2- (1-carboxyl n-decane) benzimidazole is as follows:
10g of o-phenylenediamine (OPD) and 20g of dodecanedioic acid (DC12) were weighed out, and the mixture was refluxed for 12 hours using 200mL of a 3M HCl solution as a reaction solvent.
And after the reaction is finished, carrying out suction filtration to obtain a solid filter cake, washing the solid filter cake with NaOH solution, and finishing washing when the solution is 7-8. Filtering to obtain a filter cake. And drying the filter cake to obtain the 2- (1-carboxyl n-decane) benzimidazole.
The detection data of the obtained product are as follows:1H NMR(500MHz,DMSO-d6):11.93(s,1H),7.61(m,2H),7.31(m,2H),3.64(s,1H),2.95(m,2H),2.18(m,2H),1.80(d,2H),1.48(m,2H),1.28(d,12H)。
proved to be 2- (1-carboxyl n-decane) benzimidazole with the structural formula
Figure BDA0001893175960000041
Example 2
The preparation method of 2- (1-carboxyl n-dodecane) benzimidazole is as follows:
10g of o-phenylenediamine (OPD) and 20g of tetradecanedioic acid (DC14) were weighed out, and the mixture was refluxed for 14 hours using 200mL of a 3M HCl solution as a reaction solvent.
And after the reaction is finished, carrying out suction filtration to obtain a solid filter cake, washing the solid filter cake with NaOH solution, and finishing washing when the solution is 7-8. Filtering to obtain a filter cake. And drying the filter cake to obtain the 2- (1-carboxyl n-dodecane) benzimidazole.
Example 3
The preparation method of 2- (1-carboxyl n-tetradecane) benzimidazole comprises the following steps:
10g of o-phenylenediamine (OPD) and 20g of hexadecanedioic acid (DC16) were weighed out, and the mixture was refluxed for 14 hours using 200mL of a 3M HCl solution as a reaction solvent.
And after the reaction is finished, carrying out suction filtration to obtain a solid filter cake, washing the solid filter cake with NaOH solution, and finishing washing when the solution is 7-8. Filtering to obtain a filter cake. Drying the filter cake to obtain the 2- (1-carboxyl n-tetradecane) benzimidazole.
Example 4
The preparation method of 2- (1-carboxyl n-hexadecane) benzimidazole comprises the following steps:
10g of o-phenylenediamine (OPD) and 20g of heptadecadicarboxylic acid (DC17) were weighed out, and the mixture was refluxed for 14 hours using 200mL of a 3M HCl solution as a reaction solvent.
And after the reaction is finished, carrying out suction filtration to obtain a solid filter cake, washing the solid filter cake with NaOH solution, and finishing washing when the solution is 7-8. Filtering to obtain a filter cake. And drying the filter cake to obtain the 2- (1-carboxyl n-hexadecane) benzimidazole.
Example 5
The preparation method of 2- (1-carboxyl n-octadecane) benzimidazole is as follows:
10g of o-phenylenediamine (OPD) and 20g of eicosanedioic acid (DC20) were weighed out, and reacted with 200mL of a 3M HCl solution as a reaction solvent under reflux for 15 hours.
And after the reaction is finished, carrying out suction filtration to obtain a solid filter cake, washing the solid filter cake with NaOH solution, and finishing washing when the solution is 7-8. Filtering to obtain a filter cake. Drying the filter cake to obtain the 2- (1-carboxyl n-octadecyl) benzimidazole.
Application examples
Example 1 application of 2- (1-carboxy-n-decane) benzimidazole labeled bovine serum albumin:
the activated carboxyl is coupled with the free amino of lysine in the bovine serum albumin to form a bovine serum albumin solution with a fluorescent marker.
2- (1-carboxy-n-decane) benzimidazole 0.01g dissolved in 1mL of acetone, then adding Dicyclohexylcarbodiimide (DCC) in equal amount, shaking at room temperature for 30min to activate the carboxyl group, then gradually dropping into 4mL of bovine serum albumin solution, and reacting at 4 ℃ for 2 hours.
After the reaction is finished, repeatedly concentrating and washing the product by using a centrifugal ultrafiltration membrane, removing small molecular substances, and freeze-drying to obtain the bovine serum albumin labeled by fluorescence.
The obtained fluorescence labeled bovine serum albumin has fluorescence generation under ultraviolet excitation.
Although the present invention has been described in detail above with reference to a general description, specific embodiments and examples, certain additions and optimizations to the discriminant model of the present method may be made on the basis of the present invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.

Claims (10)

1. A dicarboxylic acid based benzimidazole having the general structural formula:
Figure FDA0001893175950000011
r is a saturated or unsaturated carbon chain with 2-18 carbon atoms.
2. A preparation method of benzimidazole based on dicarboxylic acid is characterized in that o-phenylenediamine and dicarboxylic acid are subjected to dehydration condensation reaction; the dicarboxylic acid is a saturated or unsaturated dicarboxylic acid with 2-18 carbon atoms, and preferably a saturated dicarboxylic acid with 10-18 carbon atoms.
3. The method for preparing benzimidazole based on dicarboxylic acid according to claim 1, comprising the steps of:
1) mixing o-phenylenediamine and dicarboxylic acid, and performing reflux reaction by using 1-6 mol/L HCl solution as a solvent and a catalyst of a reaction system;
2) after the reaction is finished, separating and purifying.
4. The method for preparing benzimidazole based on dicarboxylic acid according to claim 1, wherein the mass ratio of the o-phenylenediamine to the dicarboxylic acid is 0.1-2.
5. The method for preparing benzimidazole based on dicarboxylic acid according to claim 1, wherein the mass-to-volume ratio of the o-phenylenediamine to the HCl solution is 10 g:
(100~300)mL。
6. the method for preparing benzimidazole based on dicarboxylic acid according to claim 1, wherein the step 1) comprises a reflux reaction for 3-24 h; and when the dicarboxylic acid is unsaturated dicarboxylic acid, carrying out reflux reaction under the protection of inert gas.
7. The method for preparing benzimidazole based on dicarboxylic acid according to claim 1, wherein the step 2) is: after the reaction is finished, carrying out suction filtration to obtain a solid filter cake, washing the solid filter cake with NaOH solution until the pH of the eluate is 7-8, and finishing washing; filtering to obtain a filter cake, and drying the filter cake.
8. The use of a dicarboxylic acid based benzimidazole according to claim 1, wherein the use is in the preparation of anthelmintic, bactericidal, anticancer drugs, high performance composites, metal corrosion protection, photosensory fluorescence labeling.
9. A photosensitive fluorescence labeling method is characterized by comprising the following operations:
s1: coupling the activated carboxyl with free amino of lysine in bovine serum albumin to form a bovine serum albumin solution with a fluorescent marker;
s2: dissolving the dicarboxylic acid-based benzimidazole of claim 1 in acetone, adding dicyclohexylcarbodiimide in an equal amount, shaking at room temperature, gradually adding dropwise the solution into the bovine serum albumin solution prepared in step S1, and reacting at 0-5 ℃;
s3: after the reaction is finished, the washing product is concentrated by a centrifugal ultrafiltration membrane and then is freeze-dried to obtain the bovine serum albumin with the fluorescent label.
10. The photosensitive fluorescent labeling method of claim 9, wherein step S2 is: dissolving 2- (1-carboxyl n-decane) benzimidazole in acetone, wherein the mass volume ratio of the 2- (1-carboxyl n-decane) benzimidazole to the acetone is (0.01-0.2) g: 10 mL; adding dicyclohexylcarbodiimide with the same amount of substances, and shaking at room temperature to obtain a marking solution; and (3) dropwise adding the marking solution into the bovine serum albumin solution according to the volume ratio of the marking solution to the bovine serum albumin solution of 1 (3-6), and reacting for 1-3 hours at 4 ℃.
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