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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
2,6-BIS[1-(2-METHYLPHENYLIMINO)ETHYL]PYRIDINE 2,6-BIS[1-(2-METHYLPHENYLIMINO)ETHYL]PYRIDINE 210537-32-9 C23H23N3
3,4-Pyridinediamine,N3-(phenylmethyl)- 3,4-Pyridinediamine,N3-(phenylmethyl)- 75115-28-5 C12H13N3
3-CYANOPYRIDINE-5-BORONIC ACID PINACOL ESTER 3-CYANOPYRIDINE-5-BORONIC ACID PINACOL ESTER 402718-29-0 C12H15BN2O2
3-(4,4-DIMETHYL-4,5-DIHYDRO-1,3-OXAZOL-2-YL)-4-METHYLPYRIDINE 3-(4,4-DIMETHYL-4,5-DIHYDRO-1,3-OXAZOL-2-YL)-4-METHYLPYRIDINE 68981-84-0 C11H14N2O
4-Methyl-2-(trifluoromethanesulfonyl)Oxypyridine 4-Methyl-2-(trifluoromethanesulfonyl)Oxypyridine 179260-78-7 C7H6F3NO3S
1-(3-AMINO-PYRIDIN-4-YL)-ETHANONE 1-(3-AMINO-PYRIDIN-4-YL)-ETHANONE 13210-52-1 C7H8N2O
5-bromo-6-fluoropyridin-2-amine 5-bromo-6-fluoropyridin-2-amine 944401-65-4 C5H4BrFN2
Ethyl 1-benzyl-1,2,3,6-tetrahydropyridine-4-carboxylate Ethyl 1-benzyl-1,2,3,6-tetrahydropyridine-4-carboxylate 23019-62-7 C15H19NO2
3-METHYLPICOLINIC ACID HYDROCHLORIDE 3-METHYLPICOLINIC ACID HYDROCHLORIDE 123811-72-3 C7H8ClNO2
1-(5-Nitro-2-pyridinyl)piperidine-3-methanol 1-(5-Nitro-2-pyridinyl)piperidine-3-methanol 419542-61-3 C11H15N3O3
3-Bromo-2,6-dimethoxypyridine 3-Bromo-2,6-dimethoxypyridine 13445-16-4 C7H8BrNO2
Methyl 4-bromonicotinate Methyl 4-bromonicotinate 1043419-29-9 C7H6BrNO2
3-HYDRAZINOPYRIDINE Dihydrochloride 3-HYDRAZINOPYRIDINE Dihydrochloride 42166-50-7 C5H7N3
4-Chloro-6,7-dihydro-5H-cyclopenta-pyridin-7-OL 4-Chloro-6,7-dihydro-5H-cyclopenta-pyridin-7-OL 126053-15-4 C8H8ClNO
2-Cyano-6-methyl-4-nitropyridine 2-Cyano-6-methyl-4-nitropyridine 30235-12-2 C7H5N3O2
3-Cyano-1,2-dihydro-4-hydroxy-2-oxopyridine 3-Cyano-1,2-dihydro-4-hydroxy-2-oxopyridine 5657-64-7 C6H4N2O2
8-Bromo-6-methylimidazo[1,2-a]pyridine 8-Bromo-6-methylimidazo[1,2-a]pyridine 136117-93-6 C8H7BrN2
3,5-Dibromopyridine-4-boronic acid 3,5-Dibromopyridine-4-boronic acid 1310384-73-6 C5H4BBr2NO2
2-METHOXY-6-METHYLPYRIDINE-3-BORONIC ACID 2-METHOXY-6-METHYLPYRIDINE-3-BORONIC ACID 1000802-75-4 C7H10BNO3
6-methyl-pyridine-2-carboxylic acid ethyl ester 6-methyl-pyridine-2-carboxylic acid ethyl ester 39640-51-2 C9H11NO2
4-CHLOROPYRIDIN-3-YLBORONIC ACID, PINACOL ESTER 98 4-CHLOROPYRIDIN-3-YLBORONIC ACID, PINACOL ESTER 98 452972-15-5 C11H15BClNO2
METHYL 2-METHOXYISONICOTINATE 97%METHYL 2-METHOXYPYRIDINE-4-CARBOXYLATE METHYL 2-METHOXYISONICOTINATE 97%METHYL 2-METHOXYPYRIDINE-4-CARBOXYLATE 26156-51-4 C8H9NO3
2-AMINO-4-METHYLNICOTINIC ACID, 2-AMINO-4-METHYLNICOTINIC ACID, 38076-82-3 C7H8N2O2
2,2'-Bipyridine-4,4'-dicarboxaldehyde 2,2'-Bipyridine-4,4'-dicarboxaldehyde 99970-84-0 C12H8N2O2
LAURYL DIMETHYLAMINE OXIDE LAURYL DIMETHYLAMINE OXIDE 70592-80-2 C10H13Br2N
2-AMINO-4-METHOXY-3-NITROPYRIDINE 2-AMINO-4-METHOXY-3-NITROPYRIDINE 84487-08-1 C6H7N3O3
3-BROMO-2-FLUORO-5-CHLOROPYRIDINE 3-BROMO-2-FLUORO-5-CHLOROPYRIDINE C5H2BrClFN
5-(4-FLUOROPHENYL)-2-PYRIDINAMINE 5-(4-FLUOROPHENYL)-2-PYRIDINAMINE 503536-73-0 C11H9FN2
3-AMINO-1-ETHYL-6-HYDROXY-4-METHYL-2-PYRIDONE 3-AMINO-1-ETHYL-6-HYDROXY-4-METHYL-2-PYRIDONE 94492-81-6 C8H12N2O2
3-FLUORO-4-(TRIFLUOROMETHYL)PYRIDINE 3-FLUORO-4-(TRIFLUOROMETHYL)PYRIDINE 113770-87-9 C6H3F4N
3H-IMIDAZO[4,5-B]PYRIDINE 3H-IMIDAZO[4,5-B]PYRIDINE 170245-18-8 C6H5N3
2-CHLORO-3-HYDROXYISONICOTINIC ACID 2-CHLORO-3-HYDROXYISONICOTINIC ACID 185423-02-3 C6H4ClNO3
3-BROMO-2-CHLOROPYRIDINE-4-BORONIC ACID 3-BROMO-2-CHLOROPYRIDINE-4-BORONIC ACID 1072944-16-1 C5H4BBrClNO2
2-BROMO-3,5-DIFLUOROPYRIDINE 2-BROMO-3,5-DIFLUOROPYRIDINE C5H2BrF2N
5-Nitro-6-oxo-1,6-dihydro-pyridine-3-carboxylic acid methyl ester 5-Nitro-6-oxo-1,6-dihydro-pyridine-3-carboxylic acid methyl ester 222970-61-8 C7H6N2O5
2-CHLORO-5-METHOXYPYRIDINE 2-CHLORO-5-METHOXYPYRIDINE 139585-48-1 C6H6ClNO
5-AMINO-2-FLUORO-ISONICOTINIC ACID 5-AMINO-2-FLUORO-ISONICOTINIC ACID 171178-43-1 C6H5FN2O2
(6-CHLORO-PYRIDIN-3-YL)-OXO-ACETIC ACID ETHYL ESTER (6-CHLORO-PYRIDIN-3-YL)-OXO-ACETIC ACID ETHYL ESTER 902837-55-2 C9H8ClNO3
6-CHLORO-2-METHOXYPYRIDIN-3-AMINE 6-CHLORO-2-METHOXYPYRIDIN-3-AMINE 914222-86-9 C6H7ClN2O
5-CHLORO-3-METHYL-PYRIDINE-2-CARBOXYLIC ACID 5-CHLORO-3-METHYL-PYRIDINE-2-CARBOXYLIC ACID 886365-46-4 C7H6ClNO2
(5-METHYLPYRIDIN-2-YL)METHANAMINE (5-METHYLPYRIDIN-2-YL)METHANAMINE 45715-08-0 C7H10N2
4-Nitropyridine-2-carboxylic acid 1-oxide 4-Nitropyridine-2-carboxylic acid 1-oxide 14933-78-9 C6H4N2O5
3-Chloro-2,5-difluoropyridine 3-Chloro-2,5-difluoropyridine 851179-00-5 C5H2ClF2N
3-Hydroxypyridine-4-carboxylic acid ethyl ester 3-Hydroxypyridine-4-carboxylic acid ethyl ester 18342-97-7 C8H9NO3
3-Iodopyridine-2-carboxylic acid 3-Iodopyridine-2-carboxylic acid 73841-32-4 C6H4INO2
3,5-DICHLORO-4-IODOPYRIDINE, 97% 3,5-DICHLORO-4-IODOPYRIDINE, 97% 343781-41-9 C5H2Cl2IN
2-BROMO-6-METHOXY-3-NITRO-PYRIDINE 2-BROMO-6-METHOXY-3-NITRO-PYRIDINE 344296-05-5 C6H5BrN2O3
6-METHYL-3,4-PYRIDINEDIAMINE 6-METHYL-3,4-PYRIDINEDIAMINE 861199-62-4 C6H9N3
5-HYDRAZINO-2-METHOXYPYRIDINE 5-HYDRAZINO-2-METHOXYPYRIDINE 160664-95-9 C6H9N3O
3,5-Dimethyl-4-nitropyridine 1-oxide 3,5-Dimethyl-4-nitropyridine 1-oxide 14248-66-9 C7H8N2O3
2-HYDROXY-4-PHENYLPYRIDINE 2-HYDROXY-4-PHENYLPYRIDINE 19006-81-6 C11H9NO
4-(4-DIPENTADECYLAMINOSTYRYL)-N-METHYLPYRIDINIUM IODIDE 4-(4-DIPENTADECYLAMINOSTYRYL)-N-METHYLPYRIDINIUM IODIDE 135288-72-1 C44H75IN2
5-amino-3-bromo-2-fluoropyridine 5-amino-3-bromo-2-fluoropyridine 209328-99-4 C5H4BrFN2
Pyridine, 2-fluoro-4-methoxy- (9CI) Pyridine, 2-fluoro-4-methoxy- (9CI) 175965-83-0 C6H6FNO
3-Chloro-2-methoxypyridin-4-ylboronic acid 3-Chloro-2-methoxypyridin-4-ylboronic acid 957060-88-7 C6H7BClNO3
ethyl 4-chloro-2-pyridin-3-ylpyrimidine-5-carboxylate ethyl 4-chloro-2-pyridin-3-ylpyrimidine-5-carboxylate 34775-04-7 C12H10ClN3O2
3-(4-AMINOPYRIDIN-3-YL)ACRYLIC ACID 3-(4-AMINOPYRIDIN-3-YL)ACRYLIC ACID 773131-96-7 C8H8N2O2
6-(benzyloxy)pyridine-2-carboxylic acid 6-(benzyloxy)pyridine-2-carboxylic acid 149744-21-8 C13H11NO3
2-Methylamino-3-amino-6-methoxypyridine 2-Methylamino-3-amino-6-methoxypyridine 90817-34-8 C7H11N3O
(2-Trifluoromethyl-pyridin-3-yl)-methanol (2-Trifluoromethyl-pyridin-3-yl)-methanol 131747-57-4 C7H6F3NO
4-pyridinylmethylguanidine 4-pyridinylmethylguanidine 45957-41-3 C7H10N4
4-BROMO-2-IODOPYRIDINE 4-BROMO-2-IODOPYRIDINE 100523-83-9 C5H3BrIN
6-ethoxynicotinic acid 6-ethoxynicotinic acid 97455-65-7 C8H9NO3
MK 0974, Telcagepant MK 0974, Telcagepant 781649-09-0 C26H27F5N6O3
2-Chloropyridine-4-carboxylic acid tert-butyl ester 2-Chloropyridine-4-carboxylic acid tert-butyl ester 295349-62-1 C10H12ClNO2
Methyl  6-fluoropicolinate Methyl 6-fluoropicolinate 455-71-0 C7H6FNO2
6-chloro-3-iodopyridin-2-amine 6-chloro-3-iodopyridin-2-amine 800402-06-6 C5H4ClIN2
2-BroMo-5-Methyl-4-nitropyridine 1-oxide 2-BroMo-5-Methyl-4-nitropyridine 1-oxide 60323-98-0 C6H5BrN2O3
3-METHOXYCARBONYL-5-NITRO-2(1H)-PYRIDINONE 3-METHOXYCARBONYL-5-NITRO-2(1H)-PYRIDINONE 856579-28-7 C7H6N2O5
4-(METHYLAMINO)-3-NITROPYRIDINE 4-(METHYLAMINO)-3-NITROPYRIDINE 1633-41-6 C6H7N3O2
1-BROMO-2-METHOXY-3-NITRO-BENZENE 1-BROMO-2-METHOXY-3-NITRO-BENZENE 31872-76-1 C6H5BrN2O3
5-BROMO-2,4-DIMETHYLPYRIDINE 5-BROMO-2,4-DIMETHYLPYRIDINE 27063-92-9 C7H8BrN
4-Bromo-2-pyridinecarboxamide 4-Bromo-2-pyridinecarboxamide 62150-46-3 C6H5BrN2O
Pyridine, 2,4-dichloro-5-iodo- Pyridine, 2,4-dichloro-5-iodo- 343781-49-7 C5H2Cl2IN
4-CHLORO-6-METHYLNICOTINONITRILE 4-CHLORO-6-METHYLNICOTINONITRILE 38875-76-2 C7H5ClN2
2-CHLORO-5-FLUORO-4-IODOPYRIDINE 2-CHLORO-5-FLUORO-4-IODOPYRIDINE C5H2ClFIN
4-AMINO-2-BROMO-3-NITROPYRIDINE 4-AMINO-2-BROMO-3-NITROPYRIDINE 84487-14-9 C5H4BrN3O2
2(3H)-PYRIDINONE, 3-CHLORO-5-(TRIFLUOROMETHYL)- 2(3H)-PYRIDINONE, 3-CHLORO-5-(TRIFLUOROMETHYL)- 79623-37-3 C6H3ClF3NO
2-Amino-4-hydroxypyridine hydrochloride 2-Amino-4-hydroxypyridine hydrochloride 1187932-09-7 C5H6N2O.HCl
6-Chlorooxazolo[4,5-b]pyridin-2(3H)-one 6-Chlorooxazolo[4,5-b]pyridin-2(3H)-one 35570-68-4 C6H3ClN2O2
2-Amino-3-hydroxy-5-chloropyridine 2-Amino-3-hydroxy-5-chloropyridine 40966-87-8 C5H5ClN2O
2-Amino-4,6-dichloro-nicotinicacidmethylester 2-Amino-4,6-dichloro-nicotinicacidmethylester 1044872-40-3 C7H6Cl2N2O2
MK-1775 MK-1775 955365-80-7 C27H32N8O2
2,5-Dichloronicotinonitrile 2,5-Dichloronicotinonitrile 126954-66-3 C6H2Cl2N2
N-(4-Methoxybenzyl)-4-nitropyridin-2-aMine N-(4-Methoxybenzyl)-4-nitropyridin-2-aMine 942076-74-6 C13H13N3O3
2-broMo-5-fluoropyridine-3,4-diaMine 2-broMo-5-fluoropyridine-3,4-diaMine 1227958-29-3 C5H5BrFN3
1-METHYL-4-PHENYL-1,2,3,6-TETRAHYDROPYRIDINE 1-METHYL-4-PHENYL-1,2,3,6-TETRAHYDROPYRIDINE 28289-54-5 C12H15N
N-Methyl-1-(pyridin-4-yl)methanamine N-Methyl-1-(pyridin-4-yl)methanamine 6971-44-4 C7H10N2
PIPERIDINE-4-CARBOXYLIC ACID (5-METHYL-PYRIDIN-2-YL)-AMIDE PIPERIDINE-4-CARBOXYLIC ACID (5-METHYL-PYRIDIN-2-YL)-AMIDE 110105-97-0 C12H17N3O
4-Phenylpyridine-N-oxide 4-Phenylpyridine-N-oxide 1131-61-9 C11H9NO
1-PYRIDIN-4-YL-ETHANOL 1-PYRIDIN-4-YL-ETHANOL 23389-75-5 C7H9NO
4-(HYDROXYMETHYL)PICOLINITRILE 4-(HYDROXYMETHYL)PICOLINITRILE 71935-32-5 C7H6N2O
Mivobulin Mivobulin 122332-18-7 C17H19N5O2
2-AMINO-4,6-DIHYDROXYPYRIDINE 2-AMINO-4,6-DIHYDROXYPYRIDINE C5H6N2O2
2-(4-Bromophenyl)imidazo[1,2-a]pyridine 2-(4-Bromophenyl)imidazo[1,2-a]pyridine 34658-66-7 C13H9BrN2
5H-CYCLOPENTA[B]PYRIDIN-7-AMINE, 6,7-DIHYDRO- 5H-CYCLOPENTA[B]PYRIDIN-7-AMINE, 6,7-DIHYDRO- 185122-75-2 C8H10N2
2-(2,2,2-TRIFLUOROETHOXY)PYRIDINE-3-CARBONITRILE 2-(2,2,2-TRIFLUOROETHOXY)PYRIDINE-3-CARBONITRILE 175277-89-1 C8H5F3N2O
4'-(4-METHYLPHENYL)-2,2':6',2''-TERPYRIDINE 4'-(4-METHYLPHENYL)-2,2':6',2''-TERPYRIDINE 89972-77-0 C22H17N3
3-NITRO-6-PYRIDINEMETHANOL 3-NITRO-6-PYRIDINEMETHANOL 36625-57-7 C6H6N2O3
6-NITRONICOTINIC ACID 6-NITRONICOTINIC ACID 33225-73-9 C6H4N2O4
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