CN110746346A - Preparation method of 2-pyridine acrylic acid - Google Patents
Preparation method of 2-pyridine acrylic acid Download PDFInfo
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- CN110746346A CN110746346A CN201911175476.8A CN201911175476A CN110746346A CN 110746346 A CN110746346 A CN 110746346A CN 201911175476 A CN201911175476 A CN 201911175476A CN 110746346 A CN110746346 A CN 110746346A
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- pyridine
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D213/00—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members
- C07D213/02—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members
- C07D213/04—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members having no bond between the ring nitrogen atom and a non-ring member or having only hydrogen or carbon atoms directly attached to the ring nitrogen atom
- C07D213/24—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members having no bond between the ring nitrogen atom and a non-ring member or having only hydrogen or carbon atoms directly attached to the ring nitrogen atom with substituted hydrocarbon radicals attached to ring carbon atoms
- C07D213/54—Radicals substituted by carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals
- C07D213/55—Acids; Esters
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- Pyridine Compounds (AREA)
Abstract
The invention belongs to the field of organic synthesis, and particularly relates to a preparation method of 2-pyridine acrylic acid, which comprises the following steps: taking 2-pyridine formaldehyde as a raw material, taking pyridine as a solvent, adding malonic acid, adding a catalyst after complete dissolution, heating to 60-70 ℃, reacting for 2.5-3h, carrying out thin-layer chromatography tracking reaction, cooling a reaction solution to 0-5 ℃ after complete reaction, pouring the reaction solution into an ice water mixture of concentrated hydrochloric acid, separating out a solid, and carrying out suction filtration to obtain the required product, namely 2-pyridine acrylic acid. The beneficial effects of the invention are as follows: the reaction condition is mild, the operation is easy, the post-treatment is simple, the scale-up production is easy, and the method is very suitable for industrial production; the catalytic effect is good, and the yield is high; the raw materials are cheap, and the production cost is low.
Description
Technical Field
The invention belongs to the field of organic synthesis, and particularly relates to a preparation method of 2-pyridine acrylic acid.
Background
Pyridine and its derivatives are widely distributed in nature. Many plant components such as alkaloids contain pyridine ring compounds in their structures, which are the basis for the production of many important compounds, which are essential raw materials for the production of pharmaceuticals, pesticides, dyes, surfactants, rubber aids, feed additives, food additives, adhesives, etc. 2-pyridine acrylic acid is an important intermediate, and the derivative thereof has radiosensitization.
At present, the reported synthetic method of 2-pyridine acrylic acid has the defects of low yield, high cost, complex process and the like.
Disclosure of Invention
The invention aims to overcome the technical defects of low yield, high cost and the like in the prior art and provide the preparation method of the 2-pyridine acrylic acid, which has high yield and simple process.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a preparation method of 2-pyridine acrylic acid comprises the following steps: taking 2-pyridine formaldehyde as a raw material, taking pyridine as a solvent, adding malonic acid, adding a catalyst after complete dissolution, heating to 60-70 ℃, reacting for 2.5-3h, carrying out thin-layer chromatography tracking reaction, cooling a reaction solution to 0-5 ℃ after complete reaction, pouring the reaction solution into an ice water mixture of concentrated hydrochloric acid, separating out a solid, and carrying out suction filtration to obtain the required product, namely 2-pyridine acrylic acid.
Further, the molar ratio of the 2-pyridinecarboxaldehyde to the malonic acid is 1: 2-2.5.
Further, the catalyst is piperidine.
Further, the dosage of the piperidine is 12-15% of the dosage of the 2-pyridinecarboxaldehyde, and the percentage is mass percentage.
Further, the preparation method of the 2-pyridine acrylic acid comprises the following steps: taking 2-pyridine formaldehyde as a raw material, taking pyridine as a solvent, adding malonic acid, adding a catalyst after complete dissolution, heating to 65 ℃, reacting for 3 hours, tracking the reaction by using a thin-layer chromatography, cooling the reaction liquid to 0-5 ℃ after complete reaction, pouring the cooled reaction liquid into an ice-water mixture of concentrated hydrochloric acid, separating out a solid, and performing suction filtration to obtain the required product, namely 2-pyridine acrylic acid.
The reaction equation of the present invention is as follows:
the beneficial effects of the invention are as follows: the reaction condition is mild, the operation is easy, the post-treatment is simple, the scale-up production is easy, and the method is very suitable for industrial production; the catalytic effect is good, and the yield is high; the raw materials are cheap, and the production cost is low.
Detailed Description
The present invention will be further described with reference to the following specific examples. These examples are purely illustrative and are intended to be a detailed description of the invention and should not be taken as limiting the invention.
Example 1
Adding 2-pyridine benzaldehyde (10.7g, 0.1mol) and malonic acid (20.4g, 0.2mol) into a 100ml round bottom flask, adding 30ml pyridine as a solvent, magnetically stirring, injecting 1.3g piperidine into the system after the pyridine is completely dissolved, heating the oil bath to 60 ℃, reacting for 2.5 hours, tracking the reaction by thin layer chromatography, cooling the reaction solution to 0-5 ℃ after the reaction is completed, pouring the reaction solution into an ice water mixture containing concentrated hydrochloric acid (12mol/l, 50ml), separating out a large amount of white solid, and performing suction filtration to obtain the required 2-pyridine acrylic acid with the molar yield of 72%.
Example 2
Adding 2-pyridine benzaldehyde (10.7g, 0.1mol) and malonic acid (20.4g, 0.2mol) into a 100ml round bottom flask, adding 30ml pyridine as a solvent, magnetically stirring, injecting 1.3g piperidine into the system after the pyridine is completely dissolved, heating the oil bath to 70 ℃, reacting for 2.5 hours, tracking the reaction by thin layer chromatography, cooling the reaction liquid to 0-5 ℃ after the reaction is completed, pouring the reaction liquid into an ice water mixture containing concentrated hydrochloric acid (12mol/l, 50ml), separating out a large amount of white solid, and performing suction filtration to obtain the required 2-pyridine acrylic acid with the molar yield of 72%.
Example 3
Adding 2-pyridine benzaldehyde (10.7g, 0.1mol) and malonic acid (23.5g, 0.23mol) into a 100ml round bottom flask, adding 30ml pyridine as a solvent, magnetically stirring, injecting 1.4g piperidine into the system after the pyridine is completely dissolved, heating the oil bath to 65 ℃, reacting for 2.5 hours, tracking the reaction by thin layer chromatography, cooling the reaction liquid to 0-5 ℃ after the reaction is completed, pouring the reaction liquid into an ice water mixture containing concentrated hydrochloric acid (12mol/l, 50ml), separating out a large amount of white solid, and performing suction filtration to obtain the required 2-pyridine acrylic acid, wherein the molar yield is 76%.
Example 4
Adding 2-pyridine benzaldehyde (10.7g, 0.1mol) and malonic acid (25.5g, 0.25mol) into a 100ml round bottom flask, adding 30ml pyridine as a solvent, magnetically stirring, injecting 1.6g piperidine into the system after the pyridine is completely dissolved, heating the oil bath to 65 ℃, reacting for 3h, tracking the reaction by thin layer chromatography, cooling the reaction solution to 0-5 ℃ after the reaction is completed, pouring the reaction solution into an ice water mixture containing concentrated hydrochloric acid (12mol/l, 50ml), separating out a large amount of white solid, and performing suction filtration to obtain the required 2-pyridine acrylic acid with the molar yield of 78%.
Claims (5)
1. A preparation method of 2-pyridine acrylic acid is characterized by comprising the following steps: taking 2-pyridine formaldehyde as a raw material, taking pyridine as a solvent, adding malonic acid, adding a catalyst after complete dissolution, heating to 60-70 ℃, reacting for 2.5-3h, carrying out thin-layer chromatography tracking reaction, cooling a reaction solution to 0-5 ℃ after complete reaction, pouring the reaction solution into an ice water mixture of concentrated hydrochloric acid, separating out a solid, and carrying out suction filtration to obtain the required product, namely 2-pyridine acrylic acid.
2. The process according to claim 1, wherein the molar ratio of 2-pyridinecarboxaldehyde to malonic acid is 1:2 to 2.5.
3. The process according to claim 1, wherein the catalyst is piperidine.
4. The method according to claim 3, wherein the amount of piperidine is 12-15% of the amount of 2-pyridinecarboxaldehyde, and the percentages are by mass.
5. The process according to claim 1, comprising the steps of: taking 2-pyridine formaldehyde as a raw material, taking pyridine as a solvent, adding malonic acid, adding a catalyst after complete dissolution, heating to 65 ℃, reacting for 3 hours, tracking the reaction by using a thin-layer chromatography, cooling the reaction liquid to 0-5 ℃ after complete reaction, pouring the cooled reaction liquid into an ice-water mixture of concentrated hydrochloric acid, separating out a solid, and performing suction filtration to obtain the required product, namely 2-pyridine acrylic acid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911175476.8A CN110746346A (en) | 2019-11-26 | 2019-11-26 | Preparation method of 2-pyridine acrylic acid |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911175476.8A CN110746346A (en) | 2019-11-26 | 2019-11-26 | Preparation method of 2-pyridine acrylic acid |
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| Publication Number | Publication Date |
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| CN110746346A true CN110746346A (en) | 2020-02-04 |
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| CN201911175476.8A Pending CN110746346A (en) | 2019-11-26 | 2019-11-26 | Preparation method of 2-pyridine acrylic acid |
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2019
- 2019-11-26 CN CN201911175476.8A patent/CN110746346A/en active Pending
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Application publication date: 20200204 |
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| WD01 | Invention patent application deemed withdrawn after publication |