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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
3,4-Pyridinediamine,  5-nitro- 3,4-Pyridinediamine, 5-nitro- 4318-68-7 C5H6N4O2
3-(CHLOROMETHYL)PYRIDINE 3-(CHLOROMETHYL)PYRIDINE 3099-31-8 C6H6ClN
2-METHOXY-6-METHYL-3-NITROPYRIDINE-4-CARBOXALDEHYDE 2-METHOXY-6-METHYL-3-NITROPYRIDINE-4-CARBOXALDEHYDE 221349-79-7 C8H8N2O4
2,5-Dichloronicotinamide 2,5-Dichloronicotinamide 75291-86-0 C6H4Cl2N2O
5-Trifluoromethyl-pyridin-3-ylamine 5-Trifluoromethyl-pyridin-3-ylamine 112110-07-3 C6H5F3N2
2-FLUORO-6-PYRIDINECARBOXAMIDE 2-FLUORO-6-PYRIDINECARBOXAMIDE 369-03-9 C6H5FN2O
2-Bromo-5-cyano-3-picoline 2-Bromo-5-cyano-3-picoline 374633-37-1 C7H5BrN2
2,3-dichloro-4-pyridineboronic acid 2,3-dichloro-4-pyridineboronic acid 951677-39-7 C5H4BCl2NO2
2-Bromo-5-chloro-3-fluoropyridine 2-Bromo-5-chloro-3-fluoropyridine 514797-97-8 C5H2BrClFN
Ethyl 6-(trifluoromethyl)nicotinate Ethyl 6-(trifluoromethyl)nicotinate 597532-36-0 C9H8F3NO2
5-BROMO-[1,2,4]TRIAZOLO[1,5-A]PYRIDINE 5-BROMO-[1,2,4]TRIAZOLO[1,5-A]PYRIDINE 143329-58-2 C6H4BrN3
2-Bromo-6-chloropyridin-3-amine 2-Bromo-6-chloropyridin-3-amine 1050501-88-6 C5H4BrClN2
5-BROMO-3-METHOXY-2-NITROPYRIDINE 5-BROMO-3-METHOXY-2-NITROPYRIDINE 152684-26-9 C6H5BrN2O3
(3-TRIFLUOROMETHYL-PYRIDIN-2-YL) METHANOL (3-TRIFLUOROMETHYL-PYRIDIN-2-YL) METHANOL 131747-44-9 C7H6F3NO
Minodronic acid Minodronic acid 180064-38-4 C9H12N2O7P2
Ethanone, 1-(3-fluoro-4-pyridinyl)- (9CI) Ethanone, 1-(3-fluoro-4-pyridinyl)- (9CI) 87674-21-3 C7H6FNO
2-Hyrdoxy-4-Methyl-5-Nitropyridine 2-Hyrdoxy-4-Methyl-5-Nitropyridine 21091-41-7 C6H6N2O3
2-Hydroxy-3-Nitro-6-Chloropyridine 2-Hydroxy-3-Nitro-6-Chloropyridine 92138-35-7 C5H3ClN2O3
1H-Pyrrolo[3,2-b]pyridine-3-carboxaldehyde (9CI) 1H-Pyrrolo[3,2-b]pyridine-3-carboxaldehyde (9CI) 276862-85-2 C8H6N2O
4-AMINO-3-PYRIDINECARBOXAMIDE 4-AMINO-3-PYRIDINECARBOXAMIDE 7418-66-8 C6H7N3O
6-(TRIFLUOROMETHYL)PYRIDIN-3-OL
6-(TRIFLUOROMETHYL)PYRIDIN-3-OL 216766-12-0 C6H4F3NO
5-BROMO-2-(2-METHYL-2H-TETRAZOL-5-YL)-PYRIDINE
5-BROMO-2-(2-METHYL-2H-TETRAZOL-5-YL)-PYRIDINE 380380-64-3 C7H6BrN5
2-(PIPERIDIN-1-YL)PYRIDINE-5-BORONIC ACID PINACOL ESTER 2-(PIPERIDIN-1-YL)PYRIDINE-5-BORONIC ACID PINACOL ESTER 852228-08-1 C16H25BN2O2
2,6-DIBROMOPYRIDINE-4-CARBOXALDEHYDE 2,6-DIBROMOPYRIDINE-4-CARBOXALDEHYDE 316800-46-1 C6H3Br2NO
2-Chloro-3,5-dibromo-4-methylpyridine 2-Chloro-3,5-dibromo-4-methylpyridine 1000017-92-4 C6H4Br2ClN
2-METHYLISONICOTINALDEHYDE 2-METHYLISONICOTINALDEHYDE 63875-01-4 C7H7NO
3-Pyridinecarboxylicacid,2-amino-5-methyl-(9CI) 3-Pyridinecarboxylicacid,2-amino-5-methyl-(9CI) 532440-94-1 C7H8N2O2
3-Pyridinecarboxamide,2-methyl-(9CI) 3-Pyridinecarboxamide,2-methyl-(9CI) 58539-65-4 C7H8N2O
2-Pyridinecarboxylicacid,5-amino-,methylester(9CI) 2-Pyridinecarboxylicacid,5-amino-,methylester(9CI) 67515-76-8 C7H8N2O2
4-AMINO-3,5-DIIODOPYRIDINE 4-AMINO-3,5-DIIODOPYRIDINE 98136-86-8 C5H4I2N2
3-Pyridinol,4-methoxy-(9CI) 3-Pyridinol,4-methoxy-(9CI) 153199-54-3 C6H7NO2
5-Fluoro-2-methoxynicotinic acid 5-Fluoro-2-methoxynicotinic acid 884494-82-0 C7H6FNO3
NDEPAP NDEPAP 75902-86-2 C22H24BrN5O2
1-(3-Nitorpyridin-2-yl)piperazine 1-(3-Nitorpyridin-2-yl)piperazine 87394-48-7 C9H12N4O2
2-Fluoropyridine-5-boronic acid pinacol ester 2-Fluoropyridine-5-boronic acid pinacol ester 444120-95-0 C11H15BFNO2
2-ETHYL-6-METHYL-3-HYDROXYPYRIDINE HYDROCHLORIDE 2-ETHYL-6-METHYL-3-HYDROXYPYRIDINE HYDROCHLORIDE 13258-59-8 C8H12ClNO
5-HYDROXY-2-NITROPYRIDINE 5-HYDROXY-2-NITROPYRIDINE 15206-26-5 C5H4N2O3
3,5-DICHLORO-4-PYRIDINECARBONITRILE 3,5-DICHLORO-4-PYRIDINECARBONITRILE 153463-65-1 C6H2Cl2N2
4-Iodo-2-(trifluoromethyl)pyridine 4-Iodo-2-(trifluoromethyl)pyridine 590371-73-6 C6H3F3IN
2-CHLORO-3-NITROPYRIDIN-4-OL 2-CHLORO-3-NITROPYRIDIN-4-OL 629655-23-8 C5H3ClN2O3
2,5-DIBROMO-3-CHLOROPYRIDINE 2,5-DIBROMO-3-CHLOROPYRIDINE 160599-70-2 C5H2Br2ClN
2-MERCAPTO-6-THIEN-2-YL-4-(TRIFLUOROMETHYL)-PYRIDINE-3-CARBONITRILE 2-MERCAPTO-6-THIEN-2-YL-4-(TRIFLUOROMETHYL)-PYRIDINE-3-CARBONITRILE 104960-50-1 C11H5F3N2S2
3-CHLORO-2,5,6-TRIFLUOROPYRIDINE 3-CHLORO-2,5,6-TRIFLUOROPYRIDINE 2879-42-7 C5HClF3N
3-NITRO-PYRIDINE-2-CARBOXYLIC ACID 3-NITRO-PYRIDINE-2-CARBOXYLIC ACID 59290-85-6 C6H4N2O4
5,5'-DIMETHYL-2,2'-DIPYRIDYL 5,5'-DIMETHYL-2,2'-DIPYRIDYL 1762-34-1 C12H12N2
METHYL-6-HYDROXYMETHYL-2-CARBOXYLATE PYRIDINE METHYL-6-HYDROXYMETHYL-2-CARBOXYLATE PYRIDINE 39977-44-1 C8H9NO3
3-AMINO-5-BROMO-PYRIDINE-2-CARBONITRILE 3-AMINO-5-BROMO-PYRIDINE-2-CARBONITRILE 573675-27-1 C6H4BrN3
2-(METHYLAMINO)NICOTINONITRILE 2-(METHYLAMINO)NICOTINONITRILE 52583-87-6 C7H7N3
6-BROMO-1,2,4-TRIAZOLO[4,3-1]PYRIDINE 6-BROMO-1,2,4-TRIAZOLO[4,3-1]PYRIDINE 108281-79-4 C6H4BrN3
(5-Chloro-3-pyridinyl)methanol (5-Chloro-3-pyridinyl)methanol 22620-34-4 C6H6ClNO
2-Chloro-3-Nitro-6-Trifluoromethyl Pyridine 2-Chloro-3-Nitro-6-Trifluoromethyl Pyridine 117519-08-1 C6H2ClF3N2O2
3-Chloro-2-iodopyridine 3-Chloro-2-iodopyridine 77332-89-9 C5H3ClIN
Methyl 4-methylnicotinate Methyl 4-methylnicotinate 33402-75-4 C8H9NO2
4-(Benzyloxy)pyridine N-oxide 4-(Benzyloxy)pyridine N-oxide 2683-66-1 C12H11NO2
Pyridine, 5-(bromomethyl)-2-chloro- (9CI) Pyridine, 5-(bromomethyl)-2-chloro- (9CI) 182924-36-3 C6H5BrClN
Imidazo[1,5-a]pyridin-8(5H)-one, 6,7-dihydro- (9CI) Imidazo[1,5-a]pyridin-8(5H)-one, 6,7-dihydro- (9CI) 426219-51-4 C7H8N2O
4-Pyridinecarboxaldehyde, 5-fluoro-1,2-dihydro-2-oxo- (9CI) 4-Pyridinecarboxaldehyde, 5-fluoro-1,2-dihydro-2-oxo- (9CI) 500148-38-9 C6H4FNO2
2-Methoxy-4-trifluoromethyl-pyridine 2-Methoxy-4-trifluoromethyl-pyridine 219715-34-1 C7H6F3NO
5-AMINOMETHYL-1H-PYRIDIN-2-ONE
5-AMINOMETHYL-1H-PYRIDIN-2-ONE 131052-84-1 C6H8N2O
1-(3-METHYL-PYRIDIN-2-YL)-[1,4]DIAZEPANE 1-(3-METHYL-PYRIDIN-2-YL)-[1,4]DIAZEPANE 880362-05-0 C11H17N3
6-Bromo-2-nitro-pyridin-3-ol 6-Bromo-2-nitro-pyridin-3-ol 443956-08-9 C5H3BrN2O3
6-chloro-2-methylnicotinonitrile 6-chloro-2-methylnicotinonitrile 66909-36-2 C7H5ClN2
Ethyl 3-cyano-2-mercapto-6-methylisonicotinate Ethyl 3-cyano-2-mercapto-6-methylisonicotinate 56891-69-1 C10H10N2O2S
6-Chloro-3-(trifluoromethyl)pyridine-2-carboxylic acid 6-Chloro-3-(trifluoromethyl)pyridine-2-carboxylic acid 796090-24-9 C7H3ClF3NO2
4-Methyl-3-pyridinecarboxamide 4-Methyl-3-pyridinecarboxamide 7250-52-4 C7H8N2O
2-MERCAPTOPYRIDINE N-OXIDE 2-MERCAPTOPYRIDINE N-OXIDE 304675-78-3 C5H5NOS
3-Bromo-2-methoxy-5-trifluoromethylpyridine 3-Bromo-2-methoxy-5-trifluoromethylpyridine 124432-63-9 C7H5BrF3NO
3-Bromo-6-chloro-2-pyridinecarboxylic acid 3-Bromo-6-chloro-2-pyridinecarboxylic acid 929000-66-8 C6H3BrClNO2
5-Chloro-2-fluoropyridin-3-ylboronic acid 5-Chloro-2-fluoropyridin-3-ylboronic acid 937595-70-5 C5H4BClFNO2
3-Methylpicolinamide 3-Methylpicolinamide 937648-82-3 C7H8N2O
2-Bromo-3,5-difluoropyridine 2-Bromo-3,5-difluoropyridine 660425-16-1 C5H2BrF2N
3-Bromo-4-hydroxy-5-nitropyridine 3-Bromo-4-hydroxy-5-nitropyridine 31872-65-8 C5H3BrN2O3
4-Chloro-6-methylpyridine-2-carboxylic acid 4-Chloro-6-methylpyridine-2-carboxylic acid 30235-19-9 C7H6ClNO2
2-CHLORO-5-NITRONICOTINONITRILE 2-CHLORO-5-NITRONICOTINONITRILE 31309-08-7 C6H2ClN3O2
thiazolo[5,4-c]pyridin-2-amine thiazolo[5,4-c]pyridin-2-amine 108310-79-8 C6H5N3S
DIETHYL 4-CHLORO-2,6-PYRIDINEDICARBOXYLATE DIETHYL 4-CHLORO-2,6-PYRIDINEDICARBOXYLATE 53389-01-8 C11H12ClNO4
5-Ethyl-2-pyridine alcohol 5-Ethyl-2-pyridine alcohol 53428-03-8 C7H9NO
6-Iodo-3-nitropyridine 6-Iodo-3-nitropyridine 28080-54-8 C5H3IN2O2
2,6-Difluoropyridine-3-carboxylic acid 2,6-Difluoropyridine-3-carboxylic acid 171178-50-0 C6H3F2NO2
2,2'-DIPYRIDYL N,N'-DIOXIDE 2,2'-DIPYRIDYL N,N'-DIOXIDE 7275-43-6 C10H8N2O2
3-METHYL-4-PYRIDINECARBOXYLIC ACID 3-METHYL-4-PYRIDINECARBOXYLIC ACID 4021-12-9 C7H7NO2
2-AMINO-5-BROMO-3,4-DIMETHYLPYRIDINE 2-AMINO-5-BROMO-3,4-DIMETHYLPYRIDINE 374537-97-0 C7H9BrN2
5-METHOXY-PYRIDIN-3-OL 5-METHOXY-PYRIDIN-3-OL 109345-94-0 C6H7NO2
2,3-BIS(TRIFLUOROMETHYL)PYRIDINE 2,3-BIS(TRIFLUOROMETHYL)PYRIDINE 1644-68-4 C7H3F6N
2,4,7-Trichloropyrido[2,3-d]pyrimidine 2,4,7-Trichloropyrido[2,3-d]pyrimidine 938443-20-0 C7H2Cl3N3
(2-Chloropyridin-3-yl)acetonitrile (2-Chloropyridin-3-yl)acetonitrile 101012-32-2 C7H5ClN2
2-Chloro-6-methoxyisonicotinic acid 2-Chloro-6-methoxyisonicotinic acid 15855-06-8 C7H6ClNO3
4,4'-Trimethylenedipyridine 4,4'-Trimethylenedipyridine 17252-51-6 C13H14N2
BENZO(B)FLUORANTHENE BENZO(B)FLUORANTHENE 205-99-2 C20H12
6-Chloropyridine-3-sulfonamide 6-Chloropyridine-3-sulfonamide 40741-46-6 C5H5ClN2O2S
3-AMINO-5-CHLORO-2-FLUOROPYRIDINE 3-AMINO-5-CHLORO-2-FLUOROPYRIDINE 103999-78-6 C5H4ClFN2
4-Ethynylpyridine 4-Ethynylpyridine 2510-22-7 C7H5N
(4-METHYLPYRIDIN-2-YL)METHYLAMINE (4-METHYLPYRIDIN-2-YL)METHYLAMINE 129768-95-2 C7H10N2
(RS)-3-AMINO-3-(3-PYRIDYL)-PROPIONIC ACID (RS)-3-AMINO-3-(3-PYRIDYL)-PROPIONIC ACID 62247-21-6 C8H10N2O2
4-AMINO-3-CHLORO-2,5,6-TRIFLUOROPYRIDINE 4-AMINO-3-CHLORO-2,5,6-TRIFLUOROPYRIDINE 2693-57-4 C5H2ClF3N2
2,2,6,6-TETRAMETHYLPIPERIDINE-1-OXYL-4-AMINO-4-CARBOXYLIC ACID 2,2,6,6-TETRAMETHYLPIPERIDINE-1-OXYL-4-AMINO-4-CARBOXYLIC ACID 15871-57-5 C10H19N2O3*
2-ACETYLAMINO-5-IODOPYRIDINE 2-ACETYLAMINO-5-IODOPYRIDINE 66131-78-0 C7H7IN2O
2-(HYDROXYMETHYL)PYRIDIN-3-OL 2-(HYDROXYMETHYL)PYRIDIN-3-OL 14047-53-1 C6H7NO2
METHYL 2,6-DICHLOROISONICOTINATE METHYL 2,6-DICHLOROISONICOTINATE 42521-09-5 C7H5Cl2NO2
2,5-DICHLORO-3-HYDROXYMETHYLPYRIDINE 2,5-DICHLORO-3-HYDROXYMETHYLPYRIDINE 558465-93-3 C6H5Cl2NO
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