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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-Methylpyridine-3-sulfonic acid 6-Methylpyridine-3-sulfonic acid 4808-69-9 C6H7NO3S
3,5-dimethylpyridin-4-amine 3,5-dimethylpyridin-4-amine 43078-60-0 C7H10N2
2-AMINO-5-CHLORO-6-PICOLINE 2-AMINO-5-CHLORO-6-PICOLINE 36936-23-9 C6H7ClN2
2-Chloro-5-(trifluoromethyl)-3-pyridinecarboxylic acid 2-Chloro-5-(trifluoromethyl)-3-pyridinecarboxylic acid 505084-59-3 C7H3ClF3NO2
2,4-Dichloropyridine-3-carboxaldehyde 2,4-Dichloropyridine-3-carboxaldehyde 134031-24-6 C6H3Cl2NO
3-Amino-4,6-dimethylpyridine 3-Amino-4,6-dimethylpyridine 1193-71-1 C7H10N2
3-ACETAMIDOPYRIDINE 3-ACETAMIDOPYRIDINE 5867-45-8 C7H8N2O
4,4'-Vinylenedipyridine 4,4'-Vinylenedipyridine 13362-78-2 C12H10N2
6,6'-Dimethyl-2,2'-dipyridyl 6,6'-Dimethyl-2,2'-dipyridyl 4411-80-7 C12H12N2
3,4-Dihydroxypyridine 3,4-Dihydroxypyridine 10182-48-6 C5H5NO2
2-ETHYL-6-METHYLPYRIDINE 2-ETHYL-6-METHYLPYRIDINE 1122-69-6 C8H11N
N-(4-Pyridyl)pyridinium chloride hydrochloride N-(4-Pyridyl)pyridinium chloride hydrochloride 5421-92-1 C10H10Cl2N2
3-BROMO-5-CHLORO-2-HYDROXYPYRIDINE 3-BROMO-5-CHLORO-2-HYDROXYPYRIDINE 137628-16-1 C5H3BrClNO
ETHYL 2-CHLOROISONICOTINATE ETHYL 2-CHLOROISONICOTINATE 54453-93-9 C8H8ClNO2
4-HYDRAZINO-3-NITROPYRIDINE 4-HYDRAZINO-3-NITROPYRIDINE 33544-42-2 C5H6N4O2
2,3-Pyridinedicarboxylic acid 2,3-Pyridinedicarboxylic acid 339155-13-4 C7H5NO4
2-(BOC-AMINO)-3-METHYLPYRIDINE 2-(BOC-AMINO)-3-METHYLPYRIDINE 138343-75-6 C11H16N2O2
2,4-DIMETHYL-3-PYRIDINECARBOXYLIC ACID 2,4-DIMETHYL-3-PYRIDINECARBOXYLIC ACID 55314-30-2 C8H9NO2
3-CHLORO-2-METHYLPYRIDINE 3-CHLORO-2-METHYLPYRIDINE 72093-03-9 C6H6ClN
2-Acetylamino-4-methylpyridine 2-Acetylamino-4-methylpyridine 5327-32-2 C8H10N2O
4-Ethoxy-3-nitropyridine hydrochloride 4-Ethoxy-3-nitropyridine hydrochloride 94602-04-7 C7H9ClN2O3
(R)-(+)-1-(4-PYRIDYL)ETHANOL (R)-(+)-1-(4-PYRIDYL)ETHANOL 27854-88-2 C7H9NO
2-CHLORO-1-METHYLPYRIDINIUM P-TOLUENESULFONATE 2-CHLORO-1-METHYLPYRIDINIUM P-TOLUENESULFONATE 7403-46-5 C13H14ClNO3S
3-(TRIMETHYLSILYLETHYNYL)PYRIDINE 3-(TRIMETHYLSILYLETHYNYL)PYRIDINE 80673-00-3 C10H13NSi
5H-Pyrrolo[3,4-b]pyridine-5,7(6H)-dione 5H-Pyrrolo[3,4-b]pyridine-5,7(6H)-dione 4664-00-0 C7H4N2O2
4-Nitropyridine 4-Nitropyridine 1122-61-8 C5H4N2O2
Methyl 4-iodopyridine-2-carboxylate Methyl 4-iodopyridine-2-carboxylate 380381-28-2 C7H6INO2
3-BROMO-5-CHLORO-2-FLUOROPYRIDINE 3-BROMO-5-CHLORO-2-FLUOROPYRIDINE 884494-87-5 C5H2BrClFN
4,4'-Bis(hydroxymethyl)-2,2'-bipyridine 4,4'-Bis(hydroxymethyl)-2,2'-bipyridine 109073-77-0 C12H12N2O2
2-Chloro-6-nitropyridine 2-Chloro-6-nitropyridine 94166-64-0 C5H3ClN2O2
4-CHLOROFURO[3,2-C]PYRIDINE 4-CHLOROFURO[3,2-C]PYRIDINE 31270-80-1 C7H4ClNO
2,5-DICHLORO-4-FORMYLPYRIDINE 2,5-DICHLORO-4-FORMYLPYRIDINE 102645-33-0 C6H3Cl2NO
2-FLUORO-3-BROMO-5-NITRO PYRIDINE 2-FLUORO-3-BROMO-5-NITRO PYRIDINE 1868-58-2 C5H2BrFN2O2
6-hydroxy-4-methyl-2-pyridone 6-hydroxy-4-methyl-2-pyridone 4664-16-8 C6H7NO2
3,4-Diamino-2-hydroxypyridine 3,4-Diamino-2-hydroxypyridine 33631-02-6 C5H7N3O
3-Bromo-2-trifluoromethylpyridine 3-Bromo-2-trifluoromethylpyridine 590371-58-7 C6H3BrF3N
5-(TRIFLUOROMETHYL)PYRIDINE-2-CARBOXAMIDE OXIME 5-(TRIFLUOROMETHYL)PYRIDINE-2-CARBOXAMIDE OXIME 175277-44-8 C7H6F3N3O
4-AMINO-3-BROMO-2-CHLOROPYRIDINE 4-AMINO-3-BROMO-2-CHLOROPYRIDINE 215364-85-5 C5H4BrClN2
N-(3-IODO-PYRIDIN-2-YL)-2,2-DIMETHYL-PROPIONAMIDE N-(3-IODO-PYRIDIN-2-YL)-2,2-DIMETHYL-PROPIONAMIDE 113975-31-8 C10H13IN2O
Methyl 5-aminopyridine-3-carboxylate Methyl 5-aminopyridine-3-carboxylate 36052-25-2 C7H8N2O2
3,5-DIBROMOPYRIDINE 1-OXIDE 3,5-DIBROMOPYRIDINE 1-OXIDE 2402-99-5 C5H3Br2NO
5-CHLORO-2-PICOLINE 5-CHLORO-2-PICOLINE 72093-07-3 C6H6ClN
3-Acetyl-2-fluoropyridine 3-Acetyl-2-fluoropyridine 79574-70-2 C7H6FNO
2-Chloro-3-fluoropyridine-4-carboxylic acid 2-Chloro-3-fluoropyridine-4-carboxylic acid 628691-93-0 C6H3ClFNO2
6-CYANONICOTINIC ACID 6-CYANONICOTINIC ACID 70165-31-0 C7H4N2O2
3-BROMO-6-HYDROXY-2-METHYLPYRIDINE 3-BROMO-6-HYDROXY-2-METHYLPYRIDINE 54923-31-8 C6H6BrNO
2-(4-Methylphenyl)pyridine 2-(4-Methylphenyl)pyridine 4467-06-5 C12H11N
TMPYP TMPYP 36951-72-1 C72H66N8O12S4
2-METHYL-6-NITROPYRIDINE 2-METHYL-6-NITROPYRIDINE 18368-61-1 C6H6N2O2
3,4-DIHYDRO-2H-PYRIDO[1,2-A]PYRIMIDIN-2-ONE 3,4-DIHYDRO-2H-PYRIDO[1,2-A]PYRIMIDIN-2-ONE 5439-14-5 C8H8N2O
2-AMINO-3-ETHYL-6-METHYLPYRIDINE 2-AMINO-3-ETHYL-6-METHYLPYRIDINE 41995-31-7 C8H12N2
4-CHLORO-PYRIDINE-2,6-DICARBOXYLIC ACID 4-CHLORO-PYRIDINE-2,6-DICARBOXYLIC ACID 4722-94-5 C7H4ClNO4
1-(3-IODO-PYRIDIN-2-YL)-PIPERAZINE 1-(3-IODO-PYRIDIN-2-YL)-PIPERAZINE 85386-98-7 C9H12IN3
3-BROMO-5-(4,4,5,5-TETRAMETHYL-[1,3,2]DIOXABOROLAN-2-YL)-PYRIDINE 3-BROMO-5-(4,4,5,5-TETRAMETHYL-[1,3,2]DIOXABOROLAN-2-YL)-PYRIDINE 452972-13-3 C11H15BBrNO2
2-FLUORO-6-HYDROXYPYRIDINE 2-FLUORO-6-HYDROXYPYRIDINE 50543-23-2 C5H4FNO
3-Fluoro-2-methoxy-6-picoline 3-Fluoro-2-methoxy-6-picoline 375368-80-2 C7H8FNO
2,6-Pyridinedicarboxaldehyde 2,6-Pyridinedicarboxaldehyde 5431-44-7 C7H5NO2
4,5-DIHYDRO-4-OXOFURO[3,2-C]PYRIDINE 4,5-DIHYDRO-4-OXOFURO[3,2-C]PYRIDINE 26956-43-4 C7H5NO2
4-(4-CHLOROBENZYL)PYRIDINE 4-(4-CHLOROBENZYL)PYRIDINE 4409-11-4 C12H10ClN
1-PYRIDIN-2-YL-ETHANOL 1-PYRIDIN-2-YL-ETHANOL 18728-61-5 C7H9NO
SB 202190 SB 202190 152121-30-7 C20H14FN3O
2-BROMOPYRIDIN-4-YLBORONIC ACID 2-BROMOPYRIDIN-4-YLBORONIC ACID 458532-94-0 C5H5BBrNO2
2-Chloro-3-methoxypyridine 2-Chloro-3-methoxypyridine 52605-96-6 C6H6ClNO
3-Nitroisonicotinic acid 3-Nitroisonicotinic acid 59290-82-3 C6H4N2O4
6,7-DIHYDRO-5H-1-PYRIDIN-5-ONE 6,7-DIHYDRO-5H-1-PYRIDIN-5-ONE 28566-14-5 C8H7NO
3-BROMO-2-FLUORONITROBENZENE 3-BROMO-2-FLUORONITROBENZENE 58534-94-4 C6H3BrFNO2
5-BROMO-2-METHOXY-3-NITRO-PYRIDINE 5-BROMO-2-METHOXY-3-NITRO-PYRIDINE 152684-30-5 C6H5BrN2O3
3-Amino-2-bromo-4,6-dimethylpyridine 3-Amino-2-bromo-4,6-dimethylpyridine 104829-98-3 C7H9BrN2
2,6-Difluoropyridine-4-boronic acid 2,6-Difluoropyridine-4-boronic acid 401816-16-8 C5H4BF2NO2
3-AMINO-5-BROMO-PYRIDIN-2-OL 3-AMINO-5-BROMO-PYRIDIN-2-OL 98786-86-8 C5H5BrN2O
5-AMINO-2-METHOXY-3-METHYLPYRIDINE HCL 5-AMINO-2-METHOXY-3-METHYLPYRIDINE HCL 867012-70-2 C7H10N2O
6,7-Dihydro-5H-pyrrolo[3,4-b]pyridine dihydrochloride 6,7-Dihydro-5H-pyrrolo[3,4-b]pyridine dihydrochloride 147740-02-1 C7H9ClN2
4-Chloro-2,6-dimethylpyridine 4-Chloro-2,6-dimethylpyridine 3512-75-2 C7H8ClN
2-HYDROXY-3-AMINO-5-PICOLINE 2-HYDROXY-3-AMINO-5-PICOLINE 52334-51-7 C6H8N2O
6-CHLORO-4-METHYLPYRIDINE-2-CARBOXYLIC ACID 6-CHLORO-4-METHYLPYRIDINE-2-CARBOXYLIC ACID 324028-95-7 C7H6ClNO2
2-Fluoro-4-trifluoromethyl-pyridine 2-Fluoro-4-trifluoromethyl-pyridine 118078-66-3 C6H3F4N
2-Bromo-3-methoxy-6-nitropyridine 2-Bromo-3-methoxy-6-nitropyridine 76066-07-4 C6H5BrN2O3
3-(Chloromethyl)-5-methylpyridine 3-(Chloromethyl)-5-methylpyridine 1007089-84-0 C7H8ClN
4-Bromopyridine 4-Bromopyridine 1120-87-2 C5H4BrN
5-Bromonicotinamide 5-Bromonicotinamide 28733-43-9 C6H5BrN2O
2-Bromo-3-cyanopyridine 2-Bromo-3-cyanopyridine 20577-26-8 C6H3BrN2
6-Chloro-2-methoxy-3-nitropyridine 6-Chloro-2-methoxy-3-nitropyridine 40851-91-0 C6H5ClN2O3
4-Hydroxynicotinic acid 4-Hydroxynicotinic acid 609-70-1 C6H5NO3
(4-CHLORO-PYRIDIN-2-YL)-METHANOL (4-CHLORO-PYRIDIN-2-YL)-METHANOL 63071-10-3 C6H6ClNO
2-Amino-3,5-difluoropyridine 2-Amino-3,5-difluoropyridine 732306-31-9 C5H4F2N2
4-(Boc-amino)pyridine 4-(Boc-amino)pyridine 98400-69-2 C10H14N2O2
2-Amino-4,5-dichloropyridine 2-Amino-4,5-dichloropyridine 188577-68-6 C5H4Cl2N2
2,4-Dichloropyrido[3,4-d]pyrimidine 2,4-Dichloropyrido[3,4-d]pyrimidine 908240-50-6 C7H3Cl2N3
2,6-DIBROMO-4-NITRO-PYRIDINE 2,6-DIBROMO-4-NITRO-PYRIDINE 175422-04-5 C5H2Br2N2O2
2-CYANOPYRIDINE-4-CARBOXALDEHYDE 2-CYANOPYRIDINE-4-CARBOXALDEHYDE 131747-70-1 C7H4N2O
2-CHLORO-4-METHOXYNICOTINONITRILE 2-CHLORO-4-METHOXYNICOTINONITRILE 98645-43-3 C7H5ClN2O
3-CHLORO-2-METHOXYPYRIDINE 3-CHLORO-2-METHOXYPYRIDINE 13472-84-9 C6H6ClNO
2-CHLORO-3-METHYLPYRIDINE-5-BORONIC ACID 2-CHLORO-3-METHYLPYRIDINE-5-BORONIC ACID 1003043-40-0 C6H7BClNO2
Ethyl 2-Aminoisonicotinate Ethyl 2-Aminoisonicotinate 13362-30-6 C8H10N2O2
7-BENZYL-5,6,7,8-TETRAHYDRO-3H-PYRIDO[3,4-D]PYRIMIDIN-4-ONE HYDROCHLORIDE 7-BENZYL-5,6,7,8-TETRAHYDRO-3H-PYRIDO[3,4-D]PYRIMIDIN-4-ONE HYDROCHLORIDE 62458-96-2 C14H15N3O
3-(Bromomethyl)pyridine Hydrobromide 3-(Bromomethyl)pyridine Hydrobromide 4916-55-6 C6H6BrN.BrH
1-N-CBZ-3-HYDROXY-PIPERIDINE 1-N-CBZ-3-HYDROXY-PIPERIDINE 95798-22-4 C13H17NO3
4-(2,4-DINITROBENZYL)PYRIDINE 4-(2,4-DINITROBENZYL)PYRIDINE 1603-85-6 C12H9N3O4
5-AMINO-2-NITROPYRIDINE 5-AMINO-2-NITROPYRIDINE 14916-65-5 C5H5N3O2
5-Chloro-2-hydroxynicotinic acid 5-Chloro-2-hydroxynicotinic acid 38076-80-1 C6H4ClNO3
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