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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
4-Pyridylacetonitrile hydrochloride 4-Pyridylacetonitrile hydrochloride 92333-25-0 C7H7ClN2
2-Chloro-6-methyl-3-pyridinecarbonitrile 2-Chloro-6-methyl-3-pyridinecarbonitrile 28900-10-9 C7H5ClN2
2,3-DICHLOROPYRIDINE-4-CARBOXYLIC ACID 2,3-DICHLOROPYRIDINE-4-CARBOXYLIC ACID 184416-84-0 C6H3Cl2NO2
(3R,4R)-(-)-1-BENZYL-3,4-PYRROLIDINDIOL (3R,4R)-(-)-1-BENZYL-3,4-PYRROLIDINDIOL 163439-82-5 C11H15NO2
6-BENZYL-2,4-DICHLORO-5,6,7,8-TETRAHYDROPYRIDO[4,3-D]PYRIMIDINE 6-BENZYL-2,4-DICHLORO-5,6,7,8-TETRAHYDROPYRIDO[4,3-D]PYRIMIDINE 778574-06-4 C14H13Cl2N3
N-Benzylniacin N-Benzylniacin 15990-43-9 C13H11NO2
3-CHLOROPYRIDINE N-OXIDE 3-CHLOROPYRIDINE N-OXIDE 1851-22-5 C5H4ClNO
2-BROMO-3-FLUORO-4-PICOLINE 2-BROMO-3-FLUORO-4-PICOLINE 884494-37-5 C6H5BrFN
N-BUTYL-4-METHYLPYRIDINIUM HEXAFLUOROPHOSPHATE N-BUTYL-4-METHYLPYRIDINIUM HEXAFLUOROPHOSPHATE 401788-99-6 C10H16F6NP
(6-Chloro-2-pyridinyl)methanol (6-Chloro-2-pyridinyl)methanol 33674-97-4 C6H6ClNO
3-PYRIDYLACETONITRILE 3-PYRIDYLACETONITRILE 6443-85-2 C7H6N2
4-Amino-2,6-dibromopyridine 4-Amino-2,6-dibromopyridine 39771-34-1 C5H4Br2N2
5-Nitro-2-pyridineacetonitrile 5-Nitro-2-pyridineacetonitrile 123846-66-2 C7H5N3O2
2-METHOXYPYRIDINE-4-CARBOXALDEHYDE 2-METHOXYPYRIDINE-4-CARBOXALDEHYDE 72716-87-1 C7H7NO2
dimebolin dimebolin 3613-73-8 C21H25N3
2-AMINO-4-CHLORO-5-NITROPYRIDINE 2-AMINO-4-CHLORO-5-NITROPYRIDINE 24484-96-6 C5H4ClN3O2
2-METHYLAMINO-5-NITROPYRIDINE 2-METHYLAMINO-5-NITROPYRIDINE 4093-89-4 C6H7N3O2
Ethyl 2-aminopyrimidine-5-carboxylate Ethyl 2-aminopyrimidine-5-carboxylate 308348-93-8 C6H7N3O2
3-(TRIFLUOROMETHYL)ISONICOTINIC ACID 3-(TRIFLUOROMETHYL)ISONICOTINIC ACID 590371-38-3 C7H4F3NO2
2-BROMO-5-METHOXYPYRIDINE 2-BROMO-5-METHOXYPYRIDINE 105170-27-2 C6H6BrNO
5-HYDRAZINYL-2-METHYLPYRIDINE 5-HYDRAZINYL-2-METHYLPYRIDINE 197516-48-6 C6H9N3
2-Aminopyridine N-oxide 2-Aminopyridine N-oxide 14150-95-9 C5H6N2O
4-METHYLPYRIDINE-2-BORONIC ACID 4-METHYLPYRIDINE-2-BORONIC ACID 372963-48-9 C6H8BNO2
3-FLUORO-5-FORMYLPYRIDINE 3-FLUORO-5-FORMYLPYRIDINE 39891-04-8 C6H4FNO
1H-PYRROLO[2,3-B]PYRIDINE-5-CARBONITRILE 1H-PYRROLO[2,3-B]PYRIDINE-5-CARBONITRILE 517918-95-5 C8H5N3
(4-CHLORO-PYRIDIN-2-YL)-CARBAMIC ACID TERT-BUTYL ESTER (4-CHLORO-PYRIDIN-2-YL)-CARBAMIC ACID TERT-BUTYL ESTER 130721-78-7 C10H13ClN2O2
2-AMINO-ISONICOTINAMIDE 2-AMINO-ISONICOTINAMIDE 13538-42-6 C6H7N3O
3-ETHYL-4-METHYLPYRIDINE 3-ETHYL-4-METHYLPYRIDINE 529-21-5 C8H11N
METHYL 5-METHYLNICOTINATE METHYL 5-METHYLNICOTINATE 29681-45-6 C8H9NO2
2-IODO-ISONICOTINIC ACID 2-IODO-ISONICOTINIC ACID 58481-10-0 C6H4INO2
2-(4-CYANOPHENOXY)-5-(TRIFLUOROMETHYL)PYRIDINE 2-(4-CYANOPHENOXY)-5-(TRIFLUOROMETHYL)PYRIDINE 175277-01-7 C13H7F3N2O
1,8-Naphthyridine 1,8-Naphthyridine 254-60-4 C8H6N2
(6-ETHOXYPYRIDIN-3-YL)BORONIC ACID (6-ETHOXYPYRIDIN-3-YL)BORONIC ACID 612845-44-0 C7H10BNO3
6-METHYL-2-OXO-4-(TRIFLUOROMETHYL)-1,2-DIHYDROPYRIDINE-3-CARBONITRILE 6-METHYL-2-OXO-4-(TRIFLUOROMETHYL)-1,2-DIHYDROPYRIDINE-3-CARBONITRILE 654-49-9 C8H5F3N2O
4-Pyridineacrylic acid 4-Pyridineacrylic acid 5337-79-1 C8H7NO2
1-(4-METHYL-PYRIDIN-2-YL)-PIPERAZINE 1-(4-METHYL-PYRIDIN-2-YL)-PIPERAZINE 34803-67-3 C10H15N3
5-METHYLNICOTINOYL CHLORIDE 5-METHYLNICOTINOYL CHLORIDE 884494-95-5 C7H6ClNO
ETHYL 1-(2,4-DIFLUOROPHENYL)-7-CHORO-6-FLUORO-4-OXO-HYDROPYRIDINO[2,3-B] PYRIDINE-3-CARBOXYLATE ETHYL 1-(2,4-DIFLUOROPHENYL)-7-CHORO-6-FLUORO-4-OXO-HYDROPYRIDINO[2,3-B] PYRIDINE-3-CARBOXYLATE 100491-29-0 C17H10ClF3N2O3
2-MERCAPTO-5-(TRIFLUOROMETHYL)PYRIDINE 2-MERCAPTO-5-(TRIFLUOROMETHYL)PYRIDINE 76041-72-0 C6H4F3NS
2-METHOXYPYRIDINE-5-CARBONITRILE 2-METHOXYPYRIDINE-5-CARBONITRILE 15871-85-9 C7H6N2O
2 6-DICHLOROPYRIDINE-3-CARBOXALDEHYDE 2 6-DICHLOROPYRIDINE-3-CARBOXALDEHYDE 55304-73-9 C6H3Cl2NO
3-Cyano-2-methylpyridine 3-Cyano-2-methylpyridine 1721-23-9 C7H6N2
6-Nitro-2,5-diaminopyridine 6-Nitro-2,5-diaminopyridine 69825-83-8 C5H6N4O2
3,5-DIBROMO-4-PYRIDINOL 3,5-DIBROMO-4-PYRIDINOL 141375-47-5 C5H3Br2NO
4-BROMO-2-TRIFLUOROMETHYLPYRIDINE 4-BROMO-2-TRIFLUOROMETHYLPYRIDINE 887583-90-6 C6H3BrF3N
2-AMINO-6-ETHYLPYRIDINE 2-AMINO-6-ETHYLPYRIDINE 21717-29-3 C7H10N2
2-METHOXY-3-NITRO-4-PICOLINE 2-METHOXY-3-NITRO-4-PICOLINE 160590-36-3 C7H8N2O3
Methyl 1-benzyl-4-oxo-3-piperidine-carboxylate hydrochloride Methyl 1-benzyl-4-oxo-3-piperidine-carboxylate hydrochloride 3939-01-3 C14H18ClNO3
4-IODOPYRIDIN-2-AMINE 4-IODOPYRIDIN-2-AMINE 552331-00-7 C5H5IN2
tert-Butyl 2,4-dichloro-5,6,7,8-tetrahydropyrido[3,4-d]pyrimidine-7-carboxylate tert-Butyl 2,4-dichloro-5,6,7,8-tetrahydropyrido[3,4-d]pyrimidine-7-carboxylate 916420-27-4 C12H15Cl2N3O2
5-BROMO-2-CHLORO-PYRIDIN-3-OL 5-BROMO-2-CHLORO-PYRIDIN-3-OL 286946-77-8 C5H3BrClNO
2-Bromo-5-fluoro-3-picoline 2-Bromo-5-fluoro-3-picoline 38186-85-5 C6H5BrFN
3-Bromo-2-hydroxy-5-(trifluoromethyl)pyridine 3-Bromo-2-hydroxy-5-(trifluoromethyl)pyridine 76041-73-1 C6H3BrF3NO
2-Hydroxy-4-methylpyridine-3-carbonitrile 2-Hydroxy-4-methylpyridine-3-carbonitrile 93271-59-1 C7H6N2O
2-Chloro-4-methylpyridine-5-boronic acid 2-Chloro-4-methylpyridine-5-boronic acid 913836-08-5 C6H7BClNO2
4-AMINO-3-BROMO-5-NITROPYRIDINE 4-AMINO-3-BROMO-5-NITROPYRIDINE 89284-05-9 C5H4BrN3O2
2-Chloro-5-fluoro-4-methyl-pyridine 2-Chloro-5-fluoro-4-methyl-pyridine 881891-83-4 C6H5ClFN
2-BROMO-6-HYDRAZINYLPYRIDINE 2-BROMO-6-HYDRAZINYLPYRIDINE 26944-71-8 C5H6BrN3
Methyl 5-bromo-6-chloropyridine-3-carboxylate Methyl 5-bromo-6-chloropyridine-3-carboxylate 78686-77-8 C7H5BrClNO2
4,6-Dichloro-2-pyridinecarboxylic acid 4,6-Dichloro-2-pyridinecarboxylic acid 88912-25-8 C6H3Cl2NO2
6-Bromopyridine-2-boronic acid 6-Bromopyridine-2-boronic acid 440680-34-2 C5H5BBrNO2
4-Iodo-2-methoxypyridine-3-carboxaldehyde 4-Iodo-2-methoxypyridine-3-carboxaldehyde 158669-26-2 C7H6INO2
5-BROMO-2-METHOXY-PYRIDINE-3-CARBALDEHYDE 5-BROMO-2-METHOXY-PYRIDINE-3-CARBALDEHYDE 103058-87-3 C7H6BrNO2
4'-BROMO-2,2':6',2''-TERPYRIDINE 4'-BROMO-2,2':6',2''-TERPYRIDINE 149817-62-9 C15H10BrN3
4-(4,4,5,5-TETRAMETHYL-[1,3,2]DIOXABOROLAN-2-YL)-3,6-DIHYDRO-2H-PYRIDINE-1-CARBOXYLIC ACID BENZYL ESTER 4-(4,4,5,5-TETRAMETHYL-[1,3,2]DIOXABOROLAN-2-YL)-3,6-DIHYDRO-2H-PYRIDINE-1-CARBOXYLIC ACID BENZYL ESTER 286961-15-7 C19H26BNO4
6-AMINO-2-METHYLNICOTINONITRILE 6-AMINO-2-METHYLNICOTINONITRILE 183428-90-2 C7H7N3
2-CHLORO-6-METHYLPYRIDINE-4-CARBONYL CHLORIDE 2-CHLORO-6-METHYLPYRIDINE-4-CARBONYL CHLORIDE 26413-58-1 C7H5Cl2NO
4-Methylpyridine-3-sulfonic acid 4-Methylpyridine-3-sulfonic acid 4808-71-3 C6H7NO3S
2-CHLORO-6-HYDRAZINOPYRIDINE 2-CHLORO-6-HYDRAZINOPYRIDINE 5193-03-3 C5H6ClN3
5-Amino-7-azaindole 5-Amino-7-azaindole 100960-07-4 C7H7N3
ETHYL 2-CHLORO-3-CYANO-6-METHYLISONICOTINATE ETHYL 2-CHLORO-3-CYANO-6-METHYLISONICOTINATE 40108-12-1 C10H9ClN2O2
3-Acetyl-2-bromopyridine 3-Acetyl-2-bromopyridine 84199-61-1 C7H6BrNO
2-AMINO-5-PHENYLPYRIDINE 2-AMINO-5-PHENYLPYRIDINE 33421-40-8 C11H10N2
3-AMINO-2-FLUORO-4-PICOLINE 3-AMINO-2-FLUORO-4-PICOLINE 173435-32-0 C6H7FN2
3-Cyano-6-(2-thienyl)-4-trifluoromethyl-2(1H)-pyridone 3-Cyano-6-(2-thienyl)-4-trifluoromethyl-2(1H)-pyridone 22123-11-1 C10H6F3NOS
5-Bromo-3-cyano-2-hydroxypyridine 5-Bromo-3-cyano-2-hydroxypyridine 405224-22-8 C6H3BrN2O
Bis(2,4,6-trimethylpyridine)iodine(I) hexafluorophosphate Bis(2,4,6-trimethylpyridine)iodine(I) hexafluorophosphate 113119-46-3 C16H22F6IN2P
5-BROMO-3-CHLORO-2-HYDROXYPYRIDINE 5-BROMO-3-CHLORO-2-HYDROXYPYRIDINE 58236-70-7 C5H3BrClNO
3-Hydroxy-4-methylpyridine 3-Hydroxy-4-methylpyridine 1121-19-3 C6H7NO
7-BENZYL-5,6,7,8-TETRAHYDRO4-CHLORO-PYRIDO[3,4-D]PYRIMIDINE HYDROCHLORIDE 7-BENZYL-5,6,7,8-TETRAHYDRO4-CHLORO-PYRIDO[3,4-D]PYRIMIDINE HYDROCHLORIDE 192869-80-0 C14H14ClN3
2-FLUORO-3-FORMYLPYRIDINE 2-FLUORO-3-FORMYLPYRIDINE 36404-90-7 C6H4FNO
4-BENZYLAMINO-3-NITROPYRIDINE 4-BENZYLAMINO-3-NITROPYRIDINE 100306-70-5 C12H11N3O2
Borane-2-picoline complex Borane-2-picoline complex 3999-38-0 C6H10BN
2-HYDROXY-3-IODO-5-NITROPYRIDINE  97 2-HYDROXY-3-IODO-5-NITROPYRIDINE 97 25391-58-6 C5H3IN2O3
2-CHLORO-3-FLUORO-4-FORMYLPYRIDINE 2-CHLORO-3-FLUORO-4-FORMYLPYRIDINE 329794-28-7 C6H3ClFNO
1-BUTYL-4-METHYLPYRIDINIUM BROMIDE 1-BUTYL-4-METHYLPYRIDINIUM BROMIDE 65350-59-6 C10H16BrN
2-FLUORO-4-METHYLPYRIDINE-5-BORONIC ACID 2-FLUORO-4-METHYLPYRIDINE-5-BORONIC ACID 1072944-18-3 C6H7BFNO2
2-BROMO-5-FLUORO-2-HYDROXYPYRIDINE 2-BROMO-5-FLUORO-2-HYDROXYPYRIDINE 884494-94-4 C5H3BrFNO
6-BROMO-[1,2,4]TRIAZOLO[1,5-A]PYRIDINE 6-BROMO-[1,2,4]TRIAZOLO[1,5-A]PYRIDINE 356560-80-0 C6H4BrN3
2-BROMO-6-ETHOXY PYRIDINE 2-BROMO-6-ETHOXY PYRIDINE 4645-11-8 C7H8BrNO
3-FLUORO-2-METHYLPYRIDINE 3-FLUORO-2-METHYLPYRIDINE 15931-15-4 C6H6FN
5-Bromo-2-(dimethylamino)pyridine 5-Bromo-2-(dimethylamino)pyridine 26163-07-5 C7H9BrN2
5-ACETYL-2-METHOXYPYRIDINE, 97% 5-ACETYL-2-METHOXYPYRIDINE, 97% 213193-32-9 C8H9NO2
4-Bromonicotinic acid 4-Bromonicotinic acid 15366-62-8 C6H4BrNO2
ETHYL 3-(2-AMINO-5-BROMOPYRIDIN-3-YL)ACRYLATE ETHYL 3-(2-AMINO-5-BROMOPYRIDIN-3-YL)ACRYLATE 227963-57-7 C10H12N2O2
(2-BROMO-PYRIDIN-4-YL)CARBAMIC ACID TERT-BUTYL ESTER (2-BROMO-PYRIDIN-4-YL)CARBAMIC ACID TERT-BUTYL ESTER 433711-95-6 C10H13BrN2O2
1-[3-CHLORO-5-(TRIFLUOROMETHYL)PYRID-2-YL]PIPERAZINE 1-[3-CHLORO-5-(TRIFLUOROMETHYL)PYRID-2-YL]PIPERAZINE 132834-59-4 C10H11ClF3N3
2-Chloro-5-(trifluoromethyl)isonicotinic acid 97% 2-Chloro-5-(trifluoromethyl)isonicotinic acid 97% 505084-58-2 C7H3ClF3NO2
3-Pyridinecarboxamide,2-amino-(9CI) 3-Pyridinecarboxamide,2-amino-(9CI) 13438-65-8 C6H7N3O
Ethyl 2,4-dihydroxy-6-methyl-3-pyridinecarboxylate Ethyl 2,4-dihydroxy-6-methyl-3-pyridinecarboxylate 70254-52-3 C9H11NO4
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