CN113501797B - Preparation method of exo-nadic anhydride - Google Patents

Preparation method of exo-nadic anhydride Download PDF

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CN113501797B
CN113501797B CN202110934986.XA CN202110934986A CN113501797B CN 113501797 B CN113501797 B CN 113501797B CN 202110934986 A CN202110934986 A CN 202110934986A CN 113501797 B CN113501797 B CN 113501797B
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exo
nadic anhydride
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cyclopentadiene
anhydride
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陈再新
邱迅
肖旭华
赵士魁
胡志远
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Jiangsu Baiaoxinkang Pharmaceutical Technology Co ltd
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Abstract

The invention discloses a preparation method of exo-nadic anhydride, which comprises the following steps: (1) Adding solvent, maleic anhydride and chiral catalyst D into a reaction container, and replacing air in the reaction container with nitrogen; (2) Cyclopentadiene is dripped at the temperature of-5 ℃ to 5 ℃ below zero, and the reaction is carried out at a certain temperature after the dripping is finished; (3) And adding water for quenching after the reaction is finished, separating liquid, concentrating, crystallizing in ethanol, and filtering to obtain the exo-nadic anhydride. The preparation method has the characteristics of high reaction stereoselectivity, high yield, good product quality, simple and convenient process operation and high stability and safety, and is suitable for industrial mass production.

Description

Preparation method of exo-nadic anhydride
Technical Field
The invention relates to a method for synthesizing exo-nadic anhydride of an organic compound, belonging to the field of organic chemical synthesis.
Background
Nadic anhydride, also known as cis-5-norbornene-2, 3-dicarboxylic anhydride, has two stereoisomers (formula I), endo (endo) and exo (exo). Compared with internal nadic anhydride, the external nadic anhydride has wider application in the synthetic research fields of resin, pesticide, medicine and the like. For example, exo-nadic anhydride is a key intermediate in the synthesis of tandospirone.
Tandospirone (Tandospirone) is an azaspirone anxiolytic developed by the japanese sumitomo pharmaceutical corporation, tandospirone citrate was marketed in japan in 1996 and was entered into china in 2003. The chemical name of the compound is (3aα,4β,7β,7aα) -hexahydro-2- [4 (4- (2-pyrimidinyl) -1-piperazinyl) butyl ] -4, 7-methylene-1 hydrogen-isoindole-1, 3 (2 hydrogen) -diketone dihydro citrate, and the chemical structural formula is shown as follows:
there are many reported methods for synthesizing tandospirone, and literature [ Chem Pharm Bull,1991,39,9,2288-2300] reports that exo-configuration nadic anhydride is used as a starting material, cis-5-exo-2, 3-dicarboximide is obtained by Pd/C hydrogenation reduction and ammonia ammoniation at 190 ℃, and then the cis-5-exo-2, 3-dicarboximide is condensed with 1, 4-dibromobutane, and then the condensation reaction is carried out with pyrimidinyl piperazine, so as to obtain the tandospirone. The route is as follows:
in the above synthetic route, exo-nadic anhydride is a key side chain for synthesizing tandospirone. In the synthesis of exo-nadic anhydride, cyclopentadiene and maleic anhydride are generally used as starting materials, a kinetic stable product endo-nadic anhydride is obtained through Diels-Alder reaction, the endo-nadic anhydride is transformed at high temperature to obtain a crude exo-nadic anhydride product, and then the solvent is used for repeated crystallization for many times to obtain a pure exo-nadic anhydride product. In the high-temperature transformation isomerization process, the system is easy to become sticky, easy to carbonize and low in yield, and a large amount of solvents are used for repeated recrystallization, so that the amount of generated organic waste liquid is large, the environment is polluted, and the three-waste treatment cost is increased.
Chinese patent CN101880274a discloses a method for converting nadic anhydride with endo configuration into nadic anhydride with exo configuration by using sodium light illumination instead of high temperature, but the method has special requirements on reaction equipment, and stability and strength of sodium light source cannot be ensured in industrial production, so that mass production is difficult to realize. Patent CN103848801a discloses a method for synthesizing exo-configuration nadic anhydride by taking dicyclopentadiene and maleic anhydride as raw materials through one step at high temperature. The method omits cracking of dicyclopentadiene, directly uses dicyclopentadiene, and improves the reaction efficiency. However, the purity of the product obtained by the method is only about 70%, the reaction system is still viscous and difficult to stir, easy to carbonize, difficult to separate after-treatment, and a large amount of endo-configuration products exist in the product. In order to solve the problem of low purity of exo products prepared from dicyclopentadiene, a novel post-treatment purification method is reported in a plurality of documents [ Polym.chem.,2017,8,4707-4715.] and pure exo-configuration nadic anhydride is obtained by recrystallizing a crude product obtained by reacting dicyclopentadiene with maleic anhydride for a plurality of times in a yield of only 20%.
The strategies used in the method for synthesizing exo-type nadic anhydride are all isomerization of endo configuration, and the method has the problems of low yield, high energy consumption, large resource waste, environmental pollution and the like. Therefore, the research on selective synthesis of exo configuration products by Diels-Alder reaction has greater significance.
Diels-Alder reactions of diene and dienophile in the construction of six-membered rings are generally based on products of endo configuration, and with the development of asymmetric synthesis, many Lewis acids as chiral catalysts exhibit good stereoselectivity in Diels-Alder reactions. Lewis acid catalysts that have been reported include halides of Al (III), B (III), fe (II), zn (II), ti (IV), or complex Lewis acids formed from chiral diols, binaphthols, sulfonamides, etc. with metals.
Literature [ Proc.Ind. of Yanbiao, 1996,9,151-153] reports that 2-methylene-1-phenyl-1, 3-butanedione and cyclopentadiene react at-78℃under zinc chloride catalysis to give exo-configuration products, wherein exo: endo is 94:6. However, zinc chloride is prone to water absorption failure in this reaction, post-treatment is complicated, and column chromatography is required. Document [ J.am.chem.Soc.1994,116,12115-12116] reports a highly sterically hindered Lewis acid ATPH prepared from aluminum and 2, 6-diphenylphenol, which catalyst selectively reacts cyclopentadiene with an α, β -unsaturated carbonyl substrate to give a product of exo configuration in a maximum ratio exo: endo of 97:3. However, the use of this catalyst has stability problems in the post-treatment, and aluminum is more sensitive to pH in the post-treatment, and is liable to occur as a sticky, by-product, or the like. Document [ Angew.chem.int.ed.1994,33,1856-1858] describes a chiral iron catalyst with which cycloaddition of 2-substituted unsaturated aldehydes and cyclopentadiene is catalyzed to give the main product in exo configuration, exo: endo >95:5. The catalyst has strict requirements on dienophile substrates, and maleic anhydride is not suitable for the reaction system.
Many asymmetric catalytic reactions of Diels-Alder are reported, but few chiral catalytic synthesis of exo-nadic anhydride is reported, and document [ chem.commun.,1996,2315-2316] reports that exo-nadic anhydride is prepared by using maleic anhydride and cyclopentadiene at room temperature in the presence of water as a solvent and indium trichloride as a catalyst, wherein exo-nadic anhydride is prepared by using exo-nadic anhydride with a product exo of 91:9 and a yield of 91%. However, the post-treatment is difficult, the viscosity is easily changed, and column chromatography is required, which is not suitable for the amplification.
Disclosure of Invention
The invention aims to provide a simple, efficient and safe synthesis method of exterior nadic anhydride by using a Diels-Alder reaction catalyzed by a chiral catalyst aiming at the defects of the prior art.
The invention provides a preparation method of exo-nadic anhydride, which has the chemical reaction formula as follows:
in order to achieve the purpose of the invention, various chiral catalysts are studied to catalyze Diels-Alder reaction of maleic anhydride and cyclopentadiene to prepare exo-nadic anhydride. Through researches, the invention unexpectedly discovers that the chiral Lewis acid catalyst D catalyzes Diels-Alder reaction of maleic anhydride and cyclopentadiene, and can obtain exo-nadic anhydride with high stereoselectivity. The structure of chiral lewis acid catalyst D is shown below:
in order to achieve the purpose of the invention, the chiral Lewis acid catalyst D catalyzes Diels-Alder reaction of maleic anhydride and cyclopentadiene, and a great deal of technological parameter research is carried out.
In order to achieve the purpose of the invention, the technical scheme of the invention comprises the following steps: (1) Adding solvent, maleic anhydride and chiral catalyst D into a reaction container, and replacing air in the reaction container with nitrogen; (2) Cyclopentadiene is dripped at the temperature of-5 ℃ to 5 ℃ below zero, and the reaction is carried out at a certain temperature after the dripping is finished; (3) And adding water for quenching after the reaction is finished, separating liquid, concentrating, crystallizing in ethanol, and filtering to obtain the exo-nadic anhydride.
According to the scheme, the selected reaction solvent is one of dichloromethane, toluene, ethyl acetate, 2-methyltetrahydrofuran and methyl tertiary butyl ether, preferably dichloromethane, and the volume consumption of the solvent is 5 times of the mass of maleic anhydride.
According to the above scheme, the molar ratio of maleic anhydride to cyclopentadiene is 1:1-1:5, preferably 1:1.3.
According to the above scheme, the reaction temperature is selected to be-25 to 15 ℃, preferably-5 to 5 ℃.
According to the scheme, the molar quantity of the catalyst is 5-15% of the molar quantity of maleic anhydride, preferably 10%.
According to the scheme, the volume amount of ethanol serving as the crystallization solvent is 5 times of the mass of maleic anhydride.
According to the scheme, the crystallization temperature is-5-0 ℃ and the crystallization time is 4-5 hours.
The invention adopts gas chromatography to detect the product purity of exo-nadic anhydride and adopts hydrogen spectrum nuclear magnetic resonance specific chemical shift integral value to calculate the ratio of endo and exo configurations.
Chiral catalysts are compounds D (ref: organic chemistry, 1997,17,359-361 and J.org.chem.1998,63, 4541-4544) whose synthetic routes are shown below:
the beneficial technical effects of the invention are as follows: the method can synthesize the exo-nadic anhydride with high efficiency, high selectivity and high yield. Compared with the prior art, the method omits the high-temperature transformation step, and has the characteristics of energy consumption conservation, more environmental protection, safety and simplicity. The purity of the obtained product is improved to 98.5%, the highest yield can reach 93%, and the highest exo: endo is 97:3, so that the utilization rate of raw materials is greatly improved, and the production cost is reduced.
In a word, the synthesis and preparation method of exo-nadic anhydride provided by the invention has the characteristics of high reaction stereoselectivity, high yield, good product quality, simple and convenient process operation, high stability and safety, and is suitable for industrial mass production.
Another object of the present invention is to provide the use of the synthesis method of exo-nadic anhydride in the preparation of tandospirone or lurasidone.
Detailed Description
The following exemplary embodiments are provided to illustrate the present invention, and simple substitutions or modifications of the present invention by those skilled in the art are within the scope of the present invention.
Example 1 preparation of chiral catalyst D
L- (-) -phenylalaninol (46.0 g,304.5 mmol) was added to a dichloromethane (150 mL) solution containing triethylamine (30.8 g,304.5 mmol), and a dichloromethane solution of diethylmalonyl chloride (30 g,152.2 mmol) was added dropwise to the solution under ice-water bath, followed by stirring at room temperature for 20 hours. Adding water, stirring, standing, and separating. The organic phase was dried, concentrated, and thionyl chloride (90 mL) was added thereto, followed by reflux reaction at 100℃for 4 hours. Concentrating under reduced pressure to remove thionyl chloride, crystallizing the mixed solvent of chloroform and normal hexane to obtain a solid. Then, the solid was dissolved in methanol (150 mL), an aqueous sodium hydroxide solution (containing 6.0g of sodium hydroxide, 90mL of water) was added dropwise, the mixture was refluxed at 85℃for 2 hours, methanol was distilled off under reduced pressure, water and chloroform were added, and the mixture was stirred, allowed to stand, and separated. The organic phase was dried over magnesium sulfate, filtered, concentrated, and purified by column chromatography to give 19.5g of the organic ligand having one-sided ring closure.
The ligand obtained above was charged into a flask dried anhydrous and oxygen-free, copper (II) triflate (16.5 g,45.7 mmol) and methylene chloride (100 mL) were added and stirred vigorously at room temperature for 4h. The filtrate was collected by filtration through celite and concentrated to give 34.7g of catalyst D as a pale green solid.
EXAMPLE 2 preparation of exo-nadic anhydride
To a 250mL three-necked flask, maleic anhydride (25.0 g,255 mmol) and methylene chloride (125 mL) were added. Stirring and dissolving, add homemade chiral catalyst D (19.4 g,25.5 mmol). The system air was replaced three times with nitrogen, then cooled to-5 ℃ under nitrogen protection, and then freshly depolymerized cold cyclopentadiene monomer (33.7 g,510 mol) was added dropwise. After the dripping is finished, the system reacts for two hours at the temperature of 5-15 ℃, 50mL of water is dripped, the temperature is raised to the room temperature, the mixture is stirred and separated, and the organic phase is washed once again with water, dried with sodium sulfate and concentrated to obtain oily matter. Absolute ethyl alcohol (125 mL) is added into the oily substance, the oily substance is placed at the temperature of between minus 5 and 0 ℃ for stirring and crystallization for 4 to 5 hours, the filtration is carried out, filter cakes are collected, the product is dried, 37.7g of exo-nadic anhydride is obtained, the yield is 90 percent, the purity is 93.8 percent (GC), and exo: endo is 95.5:4.5.
EXAMPLE 3 preparation of exo-nadic anhydride
To a 250mL three-necked flask, maleic anhydride (25.0 g,255 mmol) and methylene chloride (125 mL) were added. Stirring and dissolving, add homemade chiral catalyst D (19.4 g,25.5 mmol). The system air was replaced three times with nitrogen, and then cooled to-5 to 5℃under nitrogen protection, and then freshly depolymerized cold cyclopentadiene monomer (21.9 g,331.4 mol) was added dropwise. After the dripping is finished, the system reacts for two hours at the temperature of between 5 ℃ below zero and 5 ℃, 50mL of water is dripped, the temperature is raised to the room temperature, the mixture is stirred and separated, the organic phase is washed once again with water, dried with sodium sulfate and concentrated to obtain oily matter. Absolute ethyl alcohol (125 mL) is added into the oily substance, the oily substance is placed at the temperature of between minus 5 and 0 ℃ for stirring and crystallization for 4 to 5 hours, suction filtration is carried out, filter cakes are collected, and the product is dried, thus 38.9g of exo-nadic anhydride is obtained, the yield is 93 percent, the purity is 98.5 percent (GC), and exo: endo is 97:3.
EXAMPLE 4 preparation of exo-nadic anhydride
To a 250mL three-necked flask, maleic anhydride (25.0 g,255 mmol) and methylene chloride (125 mL) were added. Stirring for dissolution, self-made chiral catalyst D (9.7 g,12.75 mmol) was added. The system air was replaced three times with nitrogen, and then cooled to-5 to 5℃under nitrogen protection, and then freshly depolymerized cold cyclopentadiene monomer (21.9 g,331.4 mol) was added dropwise. After the dripping is finished, the system reacts for two hours at the temperature of between 5 ℃ below zero and 5 ℃, 50mL of water is dripped, the temperature is raised to the room temperature, the mixture is stirred and separated, the organic phase is washed once again with water, dried with sodium sulfate and concentrated to obtain oily matter. Absolute ethyl alcohol (125 mL) is added into the oily substance, the oily substance is placed at the temperature of between minus 5 and 0 ℃ for stirring and crystallization for 4 to 5 hours, suction filtration is carried out, filter cakes are collected, and the product is dried, thus 36.5g of exo-nadic anhydride with the yield of 87 percent and the purity of 97.7 percent (GC) is obtained, and exo: endo is 88.2:11.8.
EXAMPLE 5 preparation of exo-nadic anhydride
To a 250mL three-necked flask, maleic anhydride (25.0 g,255 mmol) and methylene chloride (125 mL) were added. Stirring for dissolution, homemade chiral catalyst D (29.1 g,38.24 mmol) was added. The system air was replaced three times with nitrogen, and then cooled to-5 to 5℃under nitrogen protection, and then freshly depolymerized cold cyclopentadiene monomer (21.9 g,331.4 mol) was added dropwise. After the dripping is finished, the system reacts for two hours at the temperature of between 5 ℃ below zero and 5 ℃, 50mL of water is dripped, the temperature is raised to the room temperature, the mixture is stirred and separated, the organic phase is washed once again with water, dried with sodium sulfate and concentrated to obtain oily matter. Absolute ethyl alcohol (125 mL) is added into the oily matter, the oily matter is placed at the temperature of between minus 5 and 0 ℃ for stirring and crystallization for 4 to 5 hours, suction filtration is carried out, filter cakes are collected, and the product is dried, thus 38.2g of exo-nadic anhydride is obtained, the yield is 91.3 percent, the purity is 97.8 percent (GC), and exo is 96.7:3.3.
EXAMPLE 6 preparation of exo-nadic anhydride
To a 250mL three-necked flask, maleic anhydride (25.0 g,255 mmol) and toluene (125 mL) were added. Stirring and dissolving, add homemade chiral catalyst D (19.4 g,25.5 mmol). The system air was replaced three times with nitrogen, and then cooled to-5 to 5℃under nitrogen protection, and then freshly depolymerized cold cyclopentadiene monomer (21.9 g,331.4 mol) was added dropwise. After the dripping is finished, the system reacts for two hours at the temperature of between 5 ℃ below zero and 5 ℃, 50mL of water is dripped, the temperature is raised to the room temperature, the mixture is stirred and separated, the organic phase is washed once again with water, dried with sodium sulfate and concentrated to obtain oily matter. Absolute ethyl alcohol (125 mL) is added into the oily substance, the oily substance is placed at the temperature of between minus 5 and 0 ℃ for stirring and crystallization for 4 to 5 hours, suction filtration is carried out, filter cakes are collected, and the filter cakes are dried, thus obtaining 35.5g of the product appearance nadic anhydride with the yield of 84.8 percent and the purity of 93.3 percent (GC), and exo: endo is 94.6:5.4.
EXAMPLE 7 preparation of exo-nadic anhydride
To a 250mL three-necked flask, maleic anhydride (25.0 g,255 mmol) and ethyl acetate (125 mL) were added. Stirring for dissolution, and adding homemade chiral catalyst (19.4 g,25.5 mmol). The system air was replaced three times with nitrogen, and then cooled to-5 ℃ under nitrogen protection, and then freshly depolymerized cold cyclopentadiene monomer (16.9 g,255 mol) was added dropwise. After the dripping is finished, the system reacts for two hours at the temperature of between 5 ℃ below zero and 5 ℃, 50mL of water is dripped, the temperature is raised to the room temperature, the mixture is stirred and separated, the organic phase is washed once again with water, dried with sodium sulfate and concentrated to obtain oily matter. Absolute ethyl alcohol (125 mL) is added into the oily matter, the oily matter is placed at the temperature of between minus 5 and 0 ℃ for stirring and crystallization for 4 to 5 hours, suction filtration is carried out, filter cakes are collected, and the filter cakes are dried, thus obtaining 33.8g of the product appearance nadic anhydride, the yield is 80.8 percent, the purity is 91.1 percent (GC), and exo: endo is 90.9:9.1.

Claims (5)

1. A preparation method of exo-nadic anhydride comprises the following steps: (1) Adding solvent, maleic anhydride and chiral catalyst D into a reaction container, and replacing air in the reaction container with nitrogen; the chiral catalyst D has the following structural formula:
(2) Cyclopentadiene is dropwise added at the temperature of-5 to 5 ℃, and after the cyclopentadiene is dropwise added, the cyclopentadiene is reacted at the temperature of-25 to 15 ℃; (3) Adding water for quenching after the reaction is finished, separating liquid, concentrating, crystallizing in ethanol, and filtering to obtain the exo-nadic anhydride;
wherein the reaction solvent used in the step (1) is one of dichloromethane, toluene, ethyl acetate, 2-methyltetrahydrofuran and methyl tertiary butyl ether.
2. The process for preparing exo-nadic anhydride according to claim 1, wherein the volume amount of the solvent is 5 times the mass of maleic anhydride.
3. The process for preparing exo-nadic anhydride according to claim 1, wherein the chiral catalyst D is used in the step (1) in an amount of 5 to 15% by mole of maleic anhydride.
4. The method for preparing exo-nadic anhydride according to claim 1, wherein the molar ratio of maleic anhydride to cyclopentadiene used in the step (1) and the step (2) is 1:1 to 1:5.
5. The process for preparing exo-nadic anhydride according to claim 1 or 4, wherein the molar ratio of maleic anhydride to cyclopentadiene used in the step (1) and the step (2) is 1:1.3.
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