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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
6-BROMO-2,4-DIMETHYLPYRIDINE-3-BORONIC ACID 6-BROMO-2,4-DIMETHYLPYRIDINE-3-BORONIC ACID 1072944-23-0 C7H9BBrNO2
2-Cyano-5-methoxypyridine 2-Cyano-5-methoxypyridine 89809-63-2 C7H6N2O
2-Bromo-3-iodopyridine 2-Bromo-3-iodopyridine 265981-13-3 C5H3BrIN
4,4'-DIMETHOXY-2,2'-BIPYRIDINE 4,4'-DIMETHOXY-2,2'-BIPYRIDINE 17217-57-1 C12H12N2O2
2-Bromo-4-methylpyridine-3-carbonitrile 2-Bromo-4-methylpyridine-3-carbonitrile 65996-02-3 C7H5BrN2
6-IODO-PYRIDINE-2-CARBOXYLIC ACID METHYL ESTER 6-IODO-PYRIDINE-2-CARBOXYLIC ACID METHYL ESTER 849830-15-5 C7H6INO2
Pyridine,3-hydrazinyl-,hydrochloride  (1:2) Pyridine,3-hydrazinyl-,hydrochloride (1:2) 364727-74-2 C5H8ClN3
4,5,6,7-Tetrahydro-3-hydroxy-[1,2,3]oxadiazolo[3,4-a]pyridin-8-ium inner salt 4,5,6,7-Tetrahydro-3-hydroxy-[1,2,3]oxadiazolo[3,4-a]pyridin-8-ium inner salt 105786-95-6 C6H8N2O2
(R)-2-AMINO-3-PYRIDIN-3-YL-PROPIONIC ACID METHYL ESTER 2 HCL (R)-2-AMINO-3-PYRIDIN-3-YL-PROPIONIC ACID METHYL ESTER 2 HCL 197088-84-9 C9H13ClN2O2
4-Methoxy-6-trifluoromethyl-2-pyrimidinamine 4-Methoxy-6-trifluoromethyl-2-pyrimidinamine 16097-61-3 C6H6F3N3O
4-BROMOTHIENO[2,3-C]PYRIDINE-2-CARBOXYLIC ACID METHYL ESTER 4-BROMOTHIENO[2,3-C]PYRIDINE-2-CARBOXYLIC ACID METHYL ESTER 145325-40-2 C9H6BrNO2S
5-P-TOLYLPYRIDIN-2-YLAMINE 5-P-TOLYLPYRIDIN-2-YLAMINE 503536-74-1 C12H12N2
2,3-dichloro-5-fluoropyridine 2,3-dichloro-5-fluoropyridine 185985-40-4 C5H2Cl2FN
5-(Trifluoromethyl)-2-pyridinemethanamine 5-(Trifluoromethyl)-2-pyridinemethanamine 164341-39-3 C7H7F3N2
4-Amino-3-chloro-2-methylpyridine 4-Amino-3-chloro-2-methylpyridine 97944-40-6 C6H7ClN2
4-Iodo-2-methylpyridine 4-Iodo-2-methylpyridine 22282-65-1 C6H6IN
6-Acetylpyridine-2-carboxylic acid ethyl ester 6-Acetylpyridine-2-carboxylic acid ethyl ester 114578-70-0 C10H11NO3
4-(6-Bromo-pyridin-2-yl)-3-methyl-benzoicacid 4-(6-Bromo-pyridin-2-yl)-3-methyl-benzoicacid 1020718-68-6 C13H10BrNO2
4-Chloro-N-methylpyridine-2-carboxamide Hydrochloride 4-Chloro-N-methylpyridine-2-carboxamide Hydrochloride 882167-77-3 C7H8Cl2N2O
1,2-BIS(2-PYRIDYL)ETHYLENE 1,2-BIS(2-PYRIDYL)ETHYLENE 1437-15-6 C12H10N2
2,3,5,6-TETRACHLOROPYRIDIN-4-AMINE 2,3,5,6-TETRACHLOROPYRIDIN-4-AMINE 2176-63-8 C5H2Cl4N2
IMIDAZO[1,2-A]PYRIDIN-3-CARBOXALDEHYDE IMIDAZO[1,2-A]PYRIDIN-3-CARBOXALDEHYDE 6188-43-8 C8H6N2O
2-ACETYLAMINO-5-BROMO-6-METHYLPYRIDINE 2-ACETYLAMINO-5-BROMO-6-METHYLPYRIDINE 142404-84-0 C8H9BrN2O
4-(5-BROMOPYRIDIN-3-YLSULPHONYL)MORPHOLINE 95 4-(5-BROMOPYRIDIN-3-YLSULPHONYL)MORPHOLINE 95 889676-35-1 C9H11BrN2O3S
2,3,5-TRIFLUOROPYRIDINE-4-CARBOXALDEHYDE 2,3,5-TRIFLUOROPYRIDINE-4-CARBOXALDEHYDE 266312-20-3 C6H2F3NO
2-AMINO-3,4-DICHLOROPYRIDINE 2-AMINO-3,4-DICHLOROPYRIDINE 188577-69-7 C5H4Cl2N2
3-Amino-2,6-dichloro-isonicotinic acid ethyl ester 3-Amino-2,6-dichloro-isonicotinic acid ethyl ester 458543-81-2 C8H8Cl2N2O2
2-BROMO-5-FLUORO-4-PICOLINE 2-BROMO-5-FLUORO-4-PICOLINE 885168-20-7 C6H5BrFN
4-CHLORO-1-ETHYL-1H-PYRAZOLO[3,4-B]PYRIDINE-5-CARBOXYLIC ACID 4-CHLORO-1-ETHYL-1H-PYRAZOLO[3,4-B]PYRIDINE-5-CARBOXYLIC ACID 59060-16-1 C9H8ClN3O2
4-METHYLNICOTINIC ACID HYDROCHLORIDE 4-METHYLNICOTINIC ACID HYDROCHLORIDE 94015-05-1 C7H8ClNO2
4-CHLORO-2-PICOLINE HCL 4-CHLORO-2-PICOLINE HCL 41753-34-8 C6H7Cl2N
3-CHLORO-2-METHOXYPYRIDINE-5-BORONIC ACID 3-CHLORO-2-METHOXYPYRIDINE-5-BORONIC ACID 942438-89-3 C6H7BClNO3
PYRIDINIUM TRIFLUOROMETHANESULFONATE PYRIDINIUM TRIFLUOROMETHANESULFONATE 52193-54-1 C6H6F3NO3S
2-(2,3-DIMETHYLPHENOXY)-3-NITROPYRIDINE 2-(2,3-DIMETHYLPHENOXY)-3-NITROPYRIDINE 76893-55-5 C13H12N2O3
3-(5-NITROPYRIDIN-2-YL)BENZOIC ACID 3-(5-NITROPYRIDIN-2-YL)BENZOIC ACID 864075-95-6 C12H8N2O4
3-AMINO-2,6-DIMETHOXYPYRIDINE MONOHYDROCHLORIDE 3-AMINO-2,6-DIMETHOXYPYRIDINE MONOHYDROCHLORIDE 80789-72-6 C7H11ClN2O2
2-CYANO-3-METHOXYPYRIDINE 2-CYANO-3-METHOXYPYRIDINE 24059-89-0 C7H6N2O
ETHYL 5-CHLOROPYRIDINE-2-CARBOXYLATE ETHYL 5-CHLOROPYRIDINE-2-CARBOXYLATE 128072-93-5 C8H8ClNO2
6-Chloro-3-iodo-2-methylpyridine 6-Chloro-3-iodo-2-methylpyridine 249291-79-0 C6H5ClIN
(6-BROMO-PYRIDIN-2-YL)-ACETONITRILE (6-BROMO-PYRIDIN-2-YL)-ACETONITRILE 112575-11-8 C7H5BrN2
4-IODOPYRIDINE-3-CARBONITRILE 4-IODOPYRIDINE-3-CARBONITRILE 490039-72-0 C6H3IN2
4-CHLORO-6-FLUOROPYRIDO[3,4-D]PYRIMIDINE 4-CHLORO-6-FLUOROPYRIDO[3,4-D]PYRIMIDINE 175357-98-9 C7H3ClFN3
3-BROMO-2-ETHOXYPYRIDINE 3-BROMO-2-ETHOXYPYRIDINE 57883-25-7 C7H8BrNO
1-[6-(Trifluoromethyl)pyridin-2-yl]piperazine 1-[6-(Trifluoromethyl)pyridin-2-yl]piperazine 127561-18-6 C10H12F3N3
3-methoxy-2-methylpyridine 3-methoxy-2-methylpyridine 26395-26-6 C7H9NO
3-(2-Phenylethyl)pyridine 3-(2-Phenylethyl)pyridine 6312-09-0 C13H13N
Methyl 3-chloropicolinate Methyl 3-chloropicolinate 116383-98-3 C7H6ClNO2
(R)-1-Benzyl-3-Hydroxy Pyridine (R)-1-Benzyl-3-Hydroxy Pyridine 94923-25-8 C12H13NO
4-Chloro-3-Pyridine-sulfonyl-chloride 4-Chloro-3-Pyridine-sulfonyl-chloride 33263-44-4 C5H3Cl2NO2S
2-Methoxy-4-methyl-3-nitropyridine 2-Methoxy-4-methyl-3-nitropyridine C7H8N2O3
8-Chloro[1,2,4]triazolo[4,3-a]pyridine 8-Chloro[1,2,4]triazolo[4,3-a]pyridine 501357-89-7 C6H4ClN3
2-(Methylamino)pyridine-3-methanol 2-(Methylamino)pyridine-3-methanol 32399-12-5 C7H10N2O
3-Aminopyridine-2-carboxylic acid ethyl ester 3-Aminopyridine-2-carboxylic acid ethyl ester 27507-15-9 C8H10N2O2
6-METHOXY-3,4-PYRIDINEDIAMINE 6-METHOXY-3,4-PYRIDINEDIAMINE 127356-26-7 C6H9N3O
2-Chloro-5-nitro-pyridin-4-ol 2-Chloro-5-nitro-pyridin-4-ol 1211386-69-4 C5H3ClN2O3
2,3-DIBROMO-4-PICOLINE 2,3-DIBROMO-4-PICOLINE 871483-22-6 C6H5Br2N
2,4-DIBROMO-3-AMINOPYRIDINE 2,4-DIBROMO-3-AMINOPYRIDINE 102249-45-6 C5H4Br2N2
2-BROMO-5-CYANO-4-PICOLINE 2-BROMO-5-CYANO-4-PICOLINE 1003711-35-0 C7H5BrN2
2-Pyridineacetic acid, 6-methyl- (9CI) 2-Pyridineacetic acid, 6-methyl- (9CI) 92917-49-2 C8H9NO2
3-Pyridinecarbonyl chloride, 6-fluoro- (9CI) 3-Pyridinecarbonyl chloride, 6-fluoro- (9CI) 65352-94-5 C6H3ClFNO
3-(BROMOMETHYL)PYRIDINE 3-(BROMOMETHYL)PYRIDINE 69966-55-8 C6H6BrN
methyl 3-bromoH-imidazo[1,2-a]pyridine-7-carboxylate methyl 3-bromoH-imidazo[1,2-a]pyridine-7-carboxylate 342613-63-2 C9H7BrN2O2
1-Propylpyridinium bromide 1-Propylpyridinium bromide 873-71-2 C8H12BrN
3-Methoxy-4-(trifluoromethyl)pyridine 3-Methoxy-4-(trifluoromethyl)pyridine 936841-72-4 C7H6F3NO
4-(METHOXYCARBONYL)NICOTINIC ACID 4-(METHOXYCARBONYL)NICOTINIC ACID 24202-74-2 C8H7NO4
4-MORPHOLINOPYRIDINE 4-MORPHOLINOPYRIDINE 2767-91-1 C9H12N2O
dimethyl 4-chloropyridine-2,6-dicarboxylate dimethyl 4-chloropyridine-2,6-dicarboxylate 5371-70-0 C9H8ClNO4
5-Bromo-N-isopropylpicolinamide 5-Bromo-N-isopropylpicolinamide 845305-90-0 C9H11BrN2O
6-Acetamidopicolinic acid, 6-(Acetylamino)pyridine-2-carboxylic acid 6-Acetamidopicolinic acid, 6-(Acetylamino)pyridine-2-carboxylic acid 26893-72-1 C8H8N2O3
2-Pyridinesulfonamide(6CI,7CI,9CI) 2-Pyridinesulfonamide(6CI,7CI,9CI) 63636-89-5 C5H6N2O2S
5-METHOXY-2-[[(4-METHOXY-3,5-DIMETHYL-2-PYRIDINYL)METHYL]THIO]-1H-IMIDAZO[4,5B]PYRIDINE 5-METHOXY-2-[[(4-METHOXY-3,5-DIMETHYL-2-PYRIDINYL)METHYL]THIO]-1H-IMIDAZO[4,5B]PYRIDINE 113713-24-9 C16H18N4O2S
2-ETHYL-5-NITROPYRIDINE 2-ETHYL-5-NITROPYRIDINE 31557-73-0 C7H8N2O2
2-Nitro-3-hydroxypyridine 2-Nitro-3-hydroxypyridine 15128-08-2 C5H4N2O3
2-Chloro-5-methoxy-3-nitropyridine 2-Chloro-5-methoxy-3-nitropyridine 1003711-55-4 C6H5ClN2O3
6-Bromo-3-chloro-2-methyl-pyridine 6-Bromo-3-chloro-2-methyl-pyridine 944317-27-5 C6H5BrClN
5H-cyclopenta[b]pyridin-7-ol,6,7-dihydro-,(7S)- 5H-cyclopenta[b]pyridin-7-ol,6,7-dihydro-,(7S)- 887921-99-5 C8H9NO
Pyridine, 5-hydrazinyl-2-methyl-, hydrochloride (1:1) Pyridine, 5-hydrazinyl-2-methyl-, hydrochloride (1:1) 896133-77-0 C6H10ClN3
1-(5-Nitropyridin-2-yl)-4-piperidinamine 1-(5-Nitropyridin-2-yl)-4-piperidinamine 252577-85-8 C10H14N4O2
2-FLUORO-3-IODO-6-METHYLPYRIDINE 2-FLUORO-3-IODO-6-METHYLPYRIDINE 884494-48-8 C6H5FIN
6-Hydroxy-2-(pyridin-2-yl)pyrimidin-4(3H)-one 6-Hydroxy-2-(pyridin-2-yl)pyrimidin-4(3H)-one 10198-74-0 C9H7N3O2
6-BROMO-4-METHYLPYRIDINE-3-BORONIC ACID 6-BROMO-4-METHYLPYRIDINE-3-BORONIC ACID 1072945-75-5 C6H7BBrNO2
2,3-DIBROMOPYRIDINE-4-CARBOXYLIC ACID 2,3-DIBROMOPYRIDINE-4-CARBOXYLIC ACID 1020056-98-7 C6H3Br2NO2
2-Amino-5-ethyl-pyridine 2-Amino-5-ethyl-pyridine 19842-07-0 C7H10N2
Ethyl (6-aminopyridin-2-yl)acetate Ethyl (6-aminopyridin-2-yl)acetate 71469-82-4 C9H12N2O2
5-Iodo-2,3-difluoropyridine 5-Iodo-2,3-difluoropyridine 851386-35-1 C5H2F2IN
5H-Cyclopenta[b]pyridine, 4-chloro-6,7-dihydro- 5H-Cyclopenta[b]pyridine, 4-chloro-6,7-dihydro- 54664-55-0 C8H8ClN
3-(BOC-AMINO)PYRIDINE 3-(BOC-AMINO)PYRIDINE 56700-70-0 C10H14N2O2
6-CHLORO-N-METHYLPYRIDIN-2-AMINE 6-CHLORO-N-METHYLPYRIDIN-2-AMINE 89026-78-8 C6H7ClN2
3-CHLORO-2-METHYL-5-(TRIFLUOROMETHYL)PYRIDINE 3-CHLORO-2-METHYL-5-(TRIFLUOROMETHYL)PYRIDINE 175277-30-2 C7H5ClF3N
6-PHENYLNICOTINIC ACID 6-PHENYLNICOTINIC ACID 29051-44-3 C12H9NO2
2,4-DIBROMO-5-FLUORO-3-NITROPYRIDINE 2,4-DIBROMO-5-FLUORO-3-NITROPYRIDINE 884494-91-1 C5HBr2FN2O2
7-benzyl-4-chloro-5,6,7,8-tetrahydropyrido[3,4-d]pyrimidin-2-amine 7-benzyl-4-chloro-5,6,7,8-tetrahydropyrido[3,4-d]pyrimidin-2-amine 859825-79-9 C14H15ClN4
2,6-DIMETHYLPYRIDINE-4-CARBOXALDEHYDE 2,6-DIMETHYLPYRIDINE-4-CARBOXALDEHYDE 18206-06-9 C8H9NO
TRANS-1-METHYL-4-CARBOXY-5-(3-PYRIDYL)-2-PYRROLIDINONE TRANS-1-METHYL-4-CARBOXY-5-(3-PYRIDYL)-2-PYRROLIDINONE 33224-01-0 C11H12N2O3
LAURIC ACID N-HYDROXY-SUCCINIMIDE ESTER LAURIC ACID N-HYDROXY-SUCCINIMIDE ESTER 14565-47-0 C16H27NO4
2,6-DIACETYLAMINOPYRIDINE 2,6-DIACETYLAMINOPYRIDINE C9H11N3O2
4-Amino-3-(trifluoromethyl)pyridine 4-Amino-3-(trifluoromethyl)pyridine 387824-61-5 C6H5F3N2
5-IODONICOTINIC ACID 5-IODONICOTINIC ACID 15366-65-1 C6H4INO2
4-ACETAMIDO-3-AMINOPYRIDINE 4-ACETAMIDO-3-AMINOPYRIDINE 145255-15-8 C7H9N3O
3-PYRIDYL ISOTHIOCYANATE 3-PYRIDYL ISOTHIOCYANATE 17452-27-6 C6H4N2S
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