4-Pyrrolidinopyridine (4-PPY) is an organic catalyst with a unique bicyclic tertiary amine structure. The nitrogen atom of the pyridine ring in its molecule provides basicity, while the pyrrolidinyl group significantly enhances its nucleophilicity and catalytic durability through steric hindrance and electronic effects. This synergistic effect enables it to surpass conventional pyridine-based catalysts (such as DMAP) and become an efficient and specific acylation reaction catalyst. It performs exceptionally well in esterification, amidation, and other acyl transfer reactions, especially suitable for the acylation of substrates with high steric hindrance (such as alcohols or amines) and those sensitive to water and oxygen or with complex structures (such as precious intermediates in sugar chemistry and natural product total synthesis). Its mechanism is to form a highly active N-acylpyridine salt intermediate preferentially with acylation reagents (such as acid anhydrides, acyl chlorides), and then rapidly transfer the acyl group to the nucleophilic reagent, achieving efficient conversion at room temperature with very few side reactions.
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Chemical Formula |
C9H12N2 |
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Exact Mass |
148 |
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Molecular Weight |
148 |
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m/z |
148 (100.0%), 149 (9.7%) |
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Elemental Analysis |
C, 72.94; H, 8.16; N, 18.90 |
4-Pyrrolidinopyridine has a wide range of applications in the field of biology. This compound has a unique structure and physicochemical properties, which make it exhibit good biocompatibility and pharmacological activity in living organisms.
1. Antitumor drugs: Pyrrolidinopyridine can be used to synthesize various anti-tumor drugs, such as paclitaxel, vincristine, etc. These drugs can inhibit the growth and spread of tumor cells and have significant effects in treating various types of cancer. Among them, paclitaxel is a natural anti-tumor drug that can be extracted from the bark of yew trees, while vincristine is a synthetic anti-tumor drug with strong anti-tumor activity.
2. Anti inflammatory drugs: Pyrrolidinopyridine can be used to synthesize non steroidal anti-inflammatory drugs (NSAIDs), such as ibuprofen, indomethacin, etc. These drugs can inhibit inflammatory reactions and have significant effects in treating various inflammatory diseases such as arthritis, gout, and toothache.
3. Antibacterial drugs: Pyrrolidinopyridine can be used to synthesize various antibacterial drugs, such as sulfonamide drugs, quinolone drugs, etc. These drugs can kill bacteria, fungi, viruses and other microorganisms, and play an important role in the treatment of infectious diseases.
4. Antiviral drugs: Pyrrolidinopyridine can be used to synthesize various antiviral drugs, such as acyclovir, famciclovir, etc. These drugs can inhibit the replication and transmission of viruses, and have significant effects in treating diseases such as viral colds and herpes virus infections.
5. Neurological drugs: Pyrrolidinopyridine can be used to synthesize various neurological drugs, such as benzodiazepines and antiepileptic drugs. These drugs can regulate the synthesis and release of neurotransmitters and have significant effects in treating diseases such as anxiety, insomnia, and epilepsy.
6. Cytotoxic drugs: Pyrrolidinopyridine can be used to synthesize cytotoxic drugs, such as alkylating agents, anti-tumor antibiotics, etc. These drugs can damage tumor cells or inhibit their growth, which is important for the treatment of cancer.
7. Immunomodulatory drugs: Pyrrolidinopyridine can be used to synthesize immunomodulatory drugs, such as glucocorticoids, immunosuppressants, etc. These drugs can regulate the function of the immune system and have significant effects in treating autoimmune diseases, allergic reactions, and other diseases.
8. Anti cardiovascular disease drugs: Pyrrolidinopyridine can be used to synthesize various anti cardiovascular disease drugs, such as antihypertensive drugs, antiarrhythmic drugs, etc. These drugs can regulate the function of the cardiovascular system and play an important role in the treatment of diseases such as hypertension and coronary heart disease.
9. Antioxidants: Pyrrolidinopyridine can be used to synthesize antioxidants such as vitamin E β- Carotenoids, etc. These antioxidants can eliminate free radicals, inhibit oxidative stress responses, and play an important role in preventing and treating oxidative stress-related diseases.
10. Enzyme inhibitors: Pyrrolidinopyridine can be used as a synthase inhibitor, such as protease inhibitor, nuclease inhibitor, etc. These enzyme inhibitors can inhibit the activity of specific enzymes and play an important role in studying metabolic processes and regulation in organisms.
4-Pyrrolidinopyridine, as an organic compound with a unique chemical structure, has demonstrated extensive application potential in multiple fields. Especially in terms of odor removal performance testing, it is widely used as an odor characteristic substance to evaluate the performance of household clothing care equipment, air purifiers, and other odor removal products.
Advantages of being a test subject
The reason why it was selected as the standard substance for odor removal performance testing is mainly attributed to the following advantages:
(1) Representative: It is a characteristic component of various odorous substances, such as cigarette smoke, certain industrial waste gases, and certain unpleasant odors in the home environment. Therefore, it can represent a class of odorous substances with similar chemical structures and properties, making the test results more universal and representative.
(2) Stability: It has high chemical stability at room temperature and pressure, and is not prone to decomposition or unnecessary chemical reactions with other substances. This stability ensures the accuracy and reliability of the test results.
(3) Detectability: It has a specific chemical structure and properties that enable it to be detected through various analytical methods, such as gas chromatography, liquid chromatography, mass spectrometry, etc. These analysis methods have high sensitivity and accuracy, which can meet the accuracy requirements of odor removal performance testing.
(4) Safety: Although it has certain toxicity, its concentration is usually low when tested for odor removal performance under appropriate conditions, and it will not have a significant impact on human health. Meanwhile, by taking appropriate protective measures, potential risks can be further reduced.
Test method for deodorization performance
The deodorization performance testing method using it as the test object usually includes the following steps:
(1) Preparation of odor samples: Firstly, it is necessary to prepare odor samples containing the substance. These samples can be prepared by dissolving them in a suitable solvent and then coating them onto a carrier material. The carrier material can be fabric, paper, or other materials that are easily in contact with air.
(3) Measurement of odor characteristic substances: Before and after the test begins, appropriate analytical methods are used to determine the concentration in the odor sample block. This can be achieved by extracting the substance from the sample block and then performing quantitative detection.
(2) Sample preparation: Place the prepared odor sample block into the odor removal device to be tested, such as household clothing care equipment, air purifier, etc. At the same time, a set of control blocks needs to be prepared to compare the odor removal effects before and after testing.
(4) Calculate the reduction rate and deodorization efficiency of odor components: Based on the concentration changes before and after testing, calculate the reduction rate and deodorization efficiency of odor components. The reduction rate refers to the ratio of the difference between the concentration after testing and the concentration before testing to the concentration before testing; Deodorization efficiency refers to the ratio of the reduction rate to the theoretical maximum reduction rate.
Analysis of Test Results
By analyzing the test results, the performance of the deodorization equipment can be evaluated. Specifically, analysis can be conducted from the following aspects:
(1) Odor removal effect: Based on the reduction rate and deodorization efficiency of odor components, the deodorization equipment's removal effect can be intuitively understood. Generally speaking, the higher the reduction rate and deodorization efficiency, the better the deodorization performance of the equipment.
(2) Reaction rate: By analyzing the concentration change curve during the testing process, the reaction rate of odor removal equipment to odors can be understood. The faster the reaction rate, the stronger the device's ability to remove odors in a short period of time.
(3) Selectivity: In some cases, deodorization equipment may simultaneously process multiple odorous substances. Therefore, it is necessary to evaluate the selective removal ability of the equipment towards it. This can be achieved by comparing the removal efficiency of the device against other odor substances.
(4) Stability: After multiple repeated tests, observe the consistency of the test results. If the reduction rate and deodorization efficiency of each test remain relatively stable, it indicates that the deodorization performance of the equipment has good stability.
4-pyrrolidinylpyridine, as an organic compound with a unique chemical structure and properties, has shown extensive potential in odor removal performance testing. By using reasonable testing methods and accurate data analysis, the performance of deodorization equipment can be evaluated, providing strong support for product improvement and optimization. At the same time, attention should be paid to concentration control, testing conditions, selection of analysis methods, and safety precautions during the testing process to ensure the accuracy and reliability of the test results. With the continuous advancement of technology and the increasing demand for quality of life, it is believed that its application in odor removal performance testing will become more and more widespread.
4-Pyrrolidinopyridine is an organic compound with multiple application values, and its synthesis methods are diverse. The following is one of the common laboratory synthesis methods and their corresponding chemical equations:
Experimental steps:
Mix 2-chloro-5-aminopyridine, potassium carbonate, sodium bicarbonate, and solvent (such as methanol) together, heat and reflux for a certain period of time to obtain the intermediate product 2-chloro-5-aminopyridine. The purpose of this reaction is to replace the chlorine atom of 2-chloro-5-aminopyridine with an amino group to obtain 2-chloro-5-aminopyridine.
2-Chloro-5-aminopyridine + K2CO3 + NaHCO3 → C5H5ClN2 + H2O + CO2
Mix the 2-chloro-5-aminopyridine obtained in the previous step with formaldehyde solution, heat and reflux for a certain period of time to obtain the intermediate product 4-hydroxy-1-methylpyridine. The purpose of this reaction is to replace the amino group of 2-chloro-5-aminopyridine with a formaldehyde group to obtain 4-hydroxy-1-methylpyridine.
C5H5ClN2 + HCHO → C6H13NO + HCl
Mix the 4-hydroxy-1-methylpiperidine obtained in the previous step with sulfoxide chloride, heat and reflux for a certain time to obtain the intermediate product 4-chloro-1-methylpiperidine. The purpose of this reaction is to replace the hydroxyl group of 4-hydroxy-1-methylpyridine with a chlorine atom to obtain 4-chloro-1-methylpyridine.
C6H13NO + SOCl2 → C6H12ClN + HCl + SO2
Mix the 4-chloro-1-methylpyridine obtained in the previous step with anhydrous sodium acetate, heat and reflux for a certain period of time, to obtain the final product Pyrrolidinopyridine. The purpose of this reaction is to replace the chlorine atom of 4-chloro-1-methylpyridine with an acetate group to obtain Pyrrolidinopyridine.
C6H12ClN + NaOH → C9H12N2 + NaCl + H2O
In summary, the above method is a common laboratory synthesis method for 4-Pyrrolidinopyridine, which includes four steps: synthesis of intermediate product 2-chloro-5-aminopyridine, synthesis of intermediate product 4-hydroxy-1-methylpyridine, and synthesis of intermediate product 4.
In the late 19th and early 20th centuries, chemical research on pyridine and its derivatives began to rise.
In 1902, German chemist Alfred Einhorn systematically studied the alkylation reaction of pyridine for the first time, laying the foundation for the subsequent synthesis of pyridine derivatives.
In 1924, British chemist Robert Robinson elucidated the electronic structural characteristics of the pyridine ring and explained its unique alkaline properties.
In the 1930s, with the development of organic synthetic chemistry, scientists began to explore the introduction of amino groups into derivatives of pyridine rings.
In 1935, the team of American chemist Roger Adams first reported the synthesis methods of 2-aminopyridine and 3-aminopyridine. These early studies provide important references for the development of 4-substituted pyridine derivatives.
In the 1940s and 1950s, with the development of medicinal chemistry, nitrogen-containing heterocyclic amine compounds received widespread attention.
In 1952, Nobel laureate in Chemistry Robert Burns Woodward emphasized the importance of saturated nitrogen heterocycles such as pyrrolidine in regulating molecular basicity while studying alkaloid synthesis.
In 1965, the Hermann K. Uhler team at the Max Planck Institute in Germany accidentally synthesized 4-pyrrolidylpyridine while studying pyridine phase transfer catalysts. They found that the introduction of pyrrolizidine at the pyridine 4-position significantly increased the alkalinity of the compound (pKa ≈ 9.5) while maintaining good nucleophilicity
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