Pyridine compound

Pyridine compound is one of the most widely developed and used heterocyclic compound. As an important fine chemical raw material, its derivatives mainly include alkyl pyridine, halogenated pyridine, aminopyridine, bromo pyridine, picoline , iodine pyridine, chloropyridine, nitropyridine-hydroxypyridine, benzyl pyridine, ethyl pyridine, pyridine cyano, fluoro pyridine, dihydropyridine, etc., in which the pesticide accounts for about 50% of the total consumption of pyridine products, feed additive about 30% and  medicine and other areas 20%.

Pyridine is a colorless or slightly yellow liquid that has weak alkaline and special odor. It is an important chemical raw material and solvent, which naturally presents in coal tar, shale oil, gas and petroleum and is miscible with most of the water, alcohols, ethers, petroleum ether, oils, benzene, chloroform and other organic solvents.

The important derivatives of pyridine mainly include nicotinic acid, nicotinamide, isonicotinic hydrazide, nicotine, strychnine, and vitamin B6.

Pyridine has a close hexagonal structure that is similar to benzene. Because of the electron-withdrawing effect of the nitrogen atom in the ring, the electron density of 2,4,6 positions is less than that of 3,5 positions. In an acidic medium, electrophilic substitution reactions occur in the 3,5 positions and nucleophilic reactions, such as amination, alkylation, arylation, acylation, occur in the 2,4,6 positions. Pyridine is a weak tertiary amine, which can form different water-soluble salts with various acids (such as picric acid, perchloric acid or the like) in an ethanol solution. Due to the alkaline of pyridine, it can generate hydrochloride (C5H5N•HCl)with hydrochloric acid. In the effect of nickel catalyst at 200 ℃ and 15-30MPa, it can generate piperidine via hydrogenation or electrolysis reduction. The reduction of pyridine is easier than benzene, while the oxidation is more difficult than benzene. But we can oxidize pyridine by the catalysis of hydrogen peroxide or peroxy acids. N-pyridine oxide is an important pyridine derivative, which is easier for the happen of aryl group electrophilic substitution reaction because the oxidation of nitrogen atoms make the formation of positively charged pyridinium cation impossible. Electrophilic substitutions, such as pyridine nitration, sulfonation, halogenation, are relatively difficult, but the previous actions are slightly easier than halogenation. We can obtain 3,5-dichloro-pyridine or 3,4,5-trichloro pyridine via pyridine nitration and sulfonation at more than 200℃. Pyridine can form many crystalline complex compounds with various metal ions.

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Structure Chemical Name CAS MF
2-Hydroxy-4-(trifluoromethyl)pyridine 2-Hydroxy-4-(trifluoromethyl)pyridine 50650-59-4 C6H4F3NO
2-Amino-3-hydroxypyridine 2-Amino-3-hydroxypyridine 16867-03-1 C5H6N2O
2-Chloropyridine-4-boronic acid pinacol ester 2-Chloropyridine-4-boronic acid pinacol ester 458532-84-8 C11H15BClNO2
2-AMINO-5-BROMO-3-IODOPYRIDINE 2-AMINO-5-BROMO-3-IODOPYRIDINE 381233-96-1 C5H4BrIN2
2-Hydroxy-5-methyl-3-nitropyridine 2-Hydroxy-5-methyl-3-nitropyridine 7464-14-4 C6H6N2O3
5-Bromo-2-iodopyridine 5-Bromo-2-iodopyridine 223463-13-6 C5H3BrIN
6-BROMO-3H-OXAZOLO[4,5-B]PYRIDIN-2-ONE
6-BROMO-3H-OXAZOLO[4,5-B]PYRIDIN-2-ONE 21594-52-5 C6H3BrN2O2
2,3-Dihydropyrido[2,3-d][1,3]oxazol-2-one 2,3-Dihydropyrido[2,3-d][1,3]oxazol-2-one 60832-72-6 C6H4N2O2
2-Fluoro-6-methylpyridine 2-Fluoro-6-methylpyridine 407-22-7 C6H6FN
2-Cyano-3-nitropyridine 2-Cyano-3-nitropyridine 51315-07-2 C6H3N3O2
6-METHYL-2-PYRIDINEMETHANOL 6-METHYL-2-PYRIDINEMETHANOL 1122-71-0 C7H9NO
(3alpha)-3-chloro-Cholest-4-ene (3alpha)-3-chloro-Cholest-4-ene 13901-10-5 C27H45Cl
2-Hydroxy-4-methylpyridine 2-Hydroxy-4-methylpyridine 13466-41-6 C6H7NO
1-Ethyl-1,2-dihydro-6-hydroxy-4-methyl-2-oxo-3-pyridinecarboxamide 1-Ethyl-1,2-dihydro-6-hydroxy-4-methyl-2-oxo-3-pyridinecarboxamide 29097-12-9 C9H12N2O3
2-Amino-6-chloropyridine 2-Amino-6-chloropyridine 45644-21-1 C5H5ClN2
6-Bromoimidazo[1,2-a]pyridine 6-Bromoimidazo[1,2-a]pyridine 6188-23-4 C7H5BrN2
2-Amino-3-cyanopyridine 2-Amino-3-cyanopyridine 24517-64-4 C6H5N3
6-(Trifluoromethyl)nicotinonitrile 6-(Trifluoromethyl)nicotinonitrile 216431-85-5 C7H3F3N2
2,6-DICHLORO-4-HYDROXYPYRIDINE 2,6-DICHLORO-4-HYDROXYPYRIDINE 17228-74-9 C5H3Cl2NO
2-AMINO-7-CHLORO-5-OXO-5H-(1)BENZOPYRANO-(2,3-B)-PYRIDINE-3-CARBONITRILE 2-AMINO-7-CHLORO-5-OXO-5H-(1)BENZOPYRANO-(2,3-B)-PYRIDINE-3-CARBONITRILE 68302-10-3 C13H6ClN3O2
2-Chloro-5-hydroxy-3-methylpyridine 2-Chloro-5-hydroxy-3-methylpyridine 54232-03-0 C6H6ClNO
4-AMINO-3,5-DINITROPYRIDINE 4-AMINO-3,5-DINITROPYRIDINE 31793-29-0 C5H4N4O4
3-Hydroxypyridine-4-carboxaldehyde 3-Hydroxypyridine-4-carboxaldehyde 1849-54-3 C6H5NO2
2-Cyano-6-Fluoropyridine 2-Cyano-6-Fluoropyridine 3939-15-9 C6H3FN2
6-IODO-[1,2,4]TRIAZOLO[1,5,A]PYRIDINE 6-IODO-[1,2,4]TRIAZOLO[1,5,A]PYRIDINE 614750-84-4 C6H4IN3
1H-Pyrazolo[3,4-b]pyridine,3-methyl-(9CI) 1H-Pyrazolo[3,4-b]pyridine,3-methyl-(9CI) 116834-96-9 C7H7N3
2-Amino-6-nitropyridine 2-Amino-6-nitropyridine 14916-63-3 C5H5N3O2
6-PHENYL-2-PYRIDONE 6-PHENYL-2-PYRIDONE 19006-82-7 C11H9NO
2,5-Dibromo-3-methylpyridine 2,5-Dibromo-3-methylpyridine 3430-18-0 C6H5Br2N
4-IODOPYRIDINE-2-CARBOXYLIC ACID 4-IODOPYRIDINE-2-CARBOXYLIC ACID 405939-79-9 C6H4INO2
4-AMINO-7-(TRIFLUOROMETHYL)QUINOLINE 4-AMINO-7-(TRIFLUOROMETHYL)QUINOLINE 243666-11-7 C10H7F3N2
4-HYDROXY-6-METHYL-3-NITRO-2-PYRIDONE 4-HYDROXY-6-METHYL-3-NITRO-2-PYRIDONE 4966-90-9 C6H6N2O4
2-Amino-3-chloropyridine 2-Amino-3-chloropyridine 39620-04-7 C5H5ClN2
2-ACETAMIDOPYRIDINE 2-ACETAMIDOPYRIDINE 5231-96-9 C7H8N2O
3-Bromo-2-methoxypyridine 3-Bromo-2-methoxypyridine 13472-59-8 C6H6BrNO
1-PYRIDIN-3-YL-ETHANOL 1-PYRIDIN-3-YL-ETHANOL 4754-27-2 C7H9NO
2-AMINO-3,5-DICHLORO-4-METHYLPYRIDINE 2-AMINO-3,5-DICHLORO-4-METHYLPYRIDINE 31430-47-4 C6H6Cl2N2
3-BROMO-4-NITROPYRIDINE 3-BROMO-4-NITROPYRIDINE 89364-04-5 C5H3BrN2O2
2-Acetamido-5-fluoropyridine 2-Acetamido-5-fluoropyridine 100304-88-9 C7H7FN2O
2-Bromo-6-iodopyridine 2-Bromo-6-iodopyridine 234111-08-1 C5H3BrIN
2-Fluoro-6-formylpyridine 2-Fluoro-6-formylpyridine 208110-81-0 C6H4FNO
2-CHLORO-5-FLUOROPYRIDINE-4-BORONIC ACID 2-CHLORO-5-FLUOROPYRIDINE-4-BORONIC ACID 951677-47-7 C5H4BClFNO2
2,6-DICHLOROPYRIDINE N-OXIDE 2,6-DICHLOROPYRIDINE N-OXIDE 2587-00-0 C5H3Cl2NO
1-ETHYL-4-METHOXYCARBONYLPYRIDINIUM IODIDE 1-ETHYL-4-METHOXYCARBONYLPYRIDINIUM IODIDE 1199-65-1 C9H12INO2
2-CYANO-4-PYRIDINE CARBOXYLIC ACID 2-CYANO-4-PYRIDINE CARBOXYLIC ACID 161233-97-2 C7H4N2O2
3-FLUORO-2-IODOPYRIDINE 3-FLUORO-2-IODOPYRIDINE 146141-04-0 C5H3FIN
METHYL 2-PYRIDYLACETATE METHYL 2-PYRIDYLACETATE 1658-42-0 C8H9NO2
2-TRIFLUOROMETHYL-4-CHLOROPYRIDINE 2-TRIFLUOROMETHYL-4-CHLOROPYRIDINE 131748-14-6 C6H3ClF3N
3-AMINO-2-PHENYLPYRIDINE 3-AMINO-2-PHENYLPYRIDINE 101601-80-3 C11H10N2
2-Anilinomethylpyridine 2-Anilinomethylpyridine 4329-81-1 C12H12N2
5-{4-[2-(5-Ethyl-2-pyridinyl)ethoxyl]benzyldene}-2,4-thiazolidinedione 5-{4-[2-(5-Ethyl-2-pyridinyl)ethoxyl]benzyldene}-2,4-thiazolidinedione 144809-28-9 C19H18N2O3S
4, 6-DIHYDROXYNICOTINIC ACID ETHYL ESTER 4, 6-DIHYDROXYNICOTINIC ACID ETHYL ESTER 6975-44-6 C8H9NO4
5-BROMOPYRIDINE-3-SULFONYL CHLORIDE 5-BROMOPYRIDINE-3-SULFONYL CHLORIDE 65001-21-0 C5H3BrClNO2S
5-CHLORO-PYRIDINE-3-CARBALDEHYDE 5-CHLORO-PYRIDINE-3-CARBALDEHYDE 113118-82-4 C6H4ClNO
2-IODO-PYRIDIN-3-YLAMINE 2-IODO-PYRIDIN-3-YLAMINE 209286-97-5 C5H5IN2
4-(TRIFLUOROMETHYL)PYRIDINE-2-CARBOXYLIC ACID 4-(TRIFLUOROMETHYL)PYRIDINE-2-CARBOXYLIC ACID 588702-62-9 C7H4F3NO2
2-Bromo-5-hydroxypyridine radical ion(1+) 2-Bromo-5-hydroxypyridine radical ion(1+) 55717-40-3 C5H4BrNO
3-Chloro-2-nitroaniline 3-Chloro-2-nitroaniline 59483-54-4 C6H5ClN2O2
METHYL 6-OXO-1,6-DIHYDRO-3-PYRIDINECARBOXYLATE METHYL 6-OXO-1,6-DIHYDRO-3-PYRIDINECARBOXYLATE 66171-50-4 C7H7NO3
5-METHOXY-1H-PYRROLO[2,3-B]PYRIDINE 5-METHOXY-1H-PYRROLO[2,3-B]PYRIDINE 183208-36-8 C8H8N2O
3-Nitropyridine 3-Nitropyridine 2530-26-9 C5H4N2O2
3-FLUORO-5-(4,4,5,5-TETRAMETHYL-[1,3,2]DIOXABOROLAN-2-YL)PYRIDINE 3-FLUORO-5-(4,4,5,5-TETRAMETHYL-[1,3,2]DIOXABOROLAN-2-YL)PYRIDINE 719268-92-5 C11H15BFNO2
2,3-Dihydro-1,4-dioxino[2,3-b]pyridine 2,3-Dihydro-1,4-dioxino[2,3-b]pyridine 129421-32-5 C7H7NO2
2,6-Dichloro-4-methyl-3-aminopyridine 2,6-Dichloro-4-methyl-3-aminopyridine 129432-25-3 C6H6Cl2N2
5-Bromo-2-methoxy-4-methyl-3-nitropyridine 5-Bromo-2-methoxy-4-methyl-3-nitropyridine 884495-14-1 C7H7BrN2O3
2-Chloro-3-Bromo-5-Hydroxypyridine 2-Chloro-3-Bromo-5-Hydroxypyridine 130115-85-4 C5H3BrClNO
2-BROMO-5-AMINO-4-PICOLINE 2-BROMO-5-AMINO-4-PICOLINE 156118-16-0 C6H7BrN2
5-Methoxy-2-(trifluoromethyl)pyridine 5-Methoxy-2-(trifluoromethyl)pyridine 216766-13-1 C7H6F3NO
3-Cyano-6-hydroxy-N-(3-isopropoxypropyl)-4-methyl-2-pyridone 3-Cyano-6-hydroxy-N-(3-isopropoxypropyl)-4-methyl-2-pyridone 68612-94-2 C13H18N2O3
2-CHLORO-3-NITRO-5-(TRIFLUOROMETHYL)PYRIDINE 2-CHLORO-3-NITRO-5-(TRIFLUOROMETHYL)PYRIDINE 72587-15-6 C6H2ClF3N2O2
3-Pyridinecarbonitrile,5-hydroxy-(9CI) 3-Pyridinecarbonitrile,5-hydroxy-(9CI) 152803-24-2 C6H4N2O
4-(Ethylaminomethyl)pyridine 4-(Ethylaminomethyl)pyridine 33403-97-3 C8H12N2
2-Chloro-6-hydroxynicotinic acid 2-Chloro-6-hydroxynicotinic acid 38025-90-0 C6H4ClNO3
2,3-Difluoropyridine-4-carboxylic acid 2,3-Difluoropyridine-4-carboxylic acid 851386-31-7 C6H3F2NO2
2,3-Difluoro-4-iodopyridine 2,3-Difluoro-4-iodopyridine 851386-34-0 C5H2F2IN
4-(Bromomethyl)pyridine hydrobromide 4-(Bromomethyl)pyridine hydrobromide 73870-24-3 C6H7Br2N
2-AMINOPYRIDINE 2-AMINOPYRIDINE 94166-58-2 C7H9N3O3
9-METHYL-3,4-DIHYDRO-2H-PYRIDO[1,2-A]PYRIMIDIN-2-ONE 9-METHYL-3,4-DIHYDRO-2H-PYRIDO[1,2-A]PYRIMIDIN-2-ONE 61751-44-8 C9H10N2O
4-Chloro-2-hydroxy-3-nitropyridine 4-Chloro-2-hydroxy-3-nitropyridine 165547-79-5 C5H3ClN2O3
4-BENZYLOXY-2(1 H)-PYRIDONE 4-BENZYLOXY-2(1 H)-PYRIDONE 53937-02-3 C12H11NO2
3-FLUOROISONICOTINALDEHYDE 3-FLUOROISONICOTINALDEHYDE 40273-47-0 C6H4FNO
2-HYDROXY-6-METHYLISONICOTINIC ACID 2-HYDROXY-6-METHYLISONICOTINIC ACID 86454-13-9 C7H7NO3
Pyridine hydrobromide Pyridine hydrobromide 18820-82-1 C5H5N.BrH
(5-BROMO-PYRIDIN-3-YL)-CARBAMIC ACID TERT-BUTYL ESTER (5-BROMO-PYRIDIN-3-YL)-CARBAMIC ACID TERT-BUTYL ESTER 361550-43-8 C10H13BrN2O2
5-Bromo-6-chloronicotinic acid 5-Bromo-6-chloronicotinic acid 29241-62-1 C6H3BrClNO2
6-HYDRAZINONICOTINIC ACID 6-HYDRAZINONICOTINIC ACID 133081-24-0 C6H7N3O2
2-(Dimethylaminomethyl)-3-hydroxypyridine 2-(Dimethylaminomethyl)-3-hydroxypyridine 2168-13-0 C8H12N2O
5-BROMO-2,3-DIHYDROXYPYRIDINE 5-BROMO-2,3-DIHYDROXYPYRIDINE 34206-49-0 C5H4BrNO2
2-Bromo-4-(trifluoromethyl)pyridine 2-Bromo-4-(trifluoromethyl)pyridine 175205-81-9 C6H3BrF3N
3-AMINO-PYRIDINE-2-CARBOXYLIC ACID AMIDE 3-AMINO-PYRIDINE-2-CARBOXYLIC ACID AMIDE 50608-99-6 C6H7N3O
2-Acetyl-3-fluoropyridine 2-Acetyl-3-fluoropyridine 87674-20-2 C7H6FNO
ETHYL 3-PYRIDYLACETATE ETHYL 3-PYRIDYLACETATE 39931-77-6 C9H11NO2
2,3-DICHLOROPYRIDINE-4-CARBOXYLIC ACID 2,3-DICHLOROPYRIDINE-4-CARBOXYLIC ACID 184416-84-0 C6H3Cl2NO2
1-(5-METHYL-PYRIDIN-2-YL)-ETHANONE 1-(5-METHYL-PYRIDIN-2-YL)-ETHANONE 5308-63-4 C8H9NO
2-Cyano-5-bromomethylpyridine 2-Cyano-5-bromomethylpyridine 308846-06-2 C7H5BrN2
2,6-Dichloro-4-picoline 2,6-Dichloro-4-picoline 39621-00-6 C6H5Cl2N
3,5-Dibromo-2-methylpyridine 3,5-Dibromo-2-methylpyridine 38749-87-0 C6H5Br2N
6-Bromo-5-methylpyridine-3-boronic acid 6-Bromo-5-methylpyridine-3-boronic acid 1003043-34-2 C6H7BBrNO2
2-Chloro-3-Nitro-5-Bromo-6-Picoline 2-Chloro-3-Nitro-5-Bromo-6-Picoline 186413-75-2 C6H4BrClN2O2
2-BROMO-3-CHLORO-5-PICOLINE 2-BROMO-3-CHLORO-5-PICOLINE 65550-81-4 C6H5BrClN
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