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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-Nitropyridine-4-carboxylic acid 2-Nitropyridine-4-carboxylic acid 33225-74-0 C6H4N2O4
5-Bromo-3-methylpyridine-2-carboxylic acid methyl ester 5-Bromo-3-methylpyridine-2-carboxylic acid methyl ester 213771-32-5 C8H8BrNO2
2,4-Dichloropyridine-3-carboxylic acid 2,4-Dichloropyridine-3-carboxylic acid 262423-77-8 C6H3Cl2NO2
2,4-Dichloropyrido[3,2-d]pyrimidine 2,4-Dichloropyrido[3,2-d]pyrimidine 39551-54-7 C7H3Cl2N3
5-BROMO-2-METHOXY-3-CYANOPYRIDINE 5-BROMO-2-METHOXY-3-CYANOPYRIDINE 884495-39-0 C6H7BrN2O
3-METHYL-4-PYRIDINECARBOXALDEHYDE 3-METHYL-4-PYRIDINECARBOXALDEHYDE 74663-96-0 C7H7NO
2-Trifluoromethyl-6-pyridinecarboxylic acid 2-Trifluoromethyl-6-pyridinecarboxylic acid 131747-42-7 C7H4F3NO2
4-[2-(4-Amino-1,2,5-oxadiazol-3-yl)-1-ethyl-7-[(3S)-3-piperidinylmethoxy]-1H-imidazo[4,5-c]pyridin-4-yl]-2-methyl-3-butyn-2-ol 4-[2-(4-Amino-1,2,5-oxadiazol-3-yl)-1-ethyl-7-[(3S)-3-piperidinylmethoxy]-1H-imidazo[4,5-c]pyridin-4-yl]-2-methyl-3-butyn-2-ol 937174-76-0 C21H27N7O3
2-(Trifluoromethyl)pyridin-4-ol 2-(Trifluoromethyl)pyridin-4-ol 170886-13-2 C6H4F3NO
5-AMINO-3-PYRIDINECARBONITRILE 5-AMINO-3-PYRIDINECARBONITRILE 13600-47-0 C6H5N3
3,3'-DIPICOLYLAMINE 3,3'-DIPICOLYLAMINE 1656-94-6 C12H13N3
2-METHOXYPYRIDINE-5-BORONIC ACID PINACOL ESTER 2-METHOXYPYRIDINE-5-BORONIC ACID PINACOL ESTER 445264-61-9 C12H18BNO3
2-Bromo-3-hydroxy-6-methylpyridine 2-Bromo-3-hydroxy-6-methylpyridine 23003-35-2 C6H6BrNO
1-METHYL-3,5-DINITRO-1H-PYRIDIN-2-ONE 1-METHYL-3,5-DINITRO-1H-PYRIDIN-2-ONE 14150-94-8 C6H5N3O5
PYRIDINE-2-CARBOXYLIC ACID HYDRAZIDE PYRIDINE-2-CARBOXYLIC ACID HYDRAZIDE 1452-63-7 C6H7N3O
2-HYDROXY-3-METHYLPYRIDINE 2-HYDROXY-3-METHYLPYRIDINE 91914-04-4 C6H7NO
5-Fluoro-2-forMylpyridine 5-Fluoro-2-forMylpyridine 31181-88-1 C6H4FNO
2-PHENOXYNICOTINONITRILE 2-PHENOXYNICOTINONITRILE 14178-15-5 C12H8N2O
(S)-1-(6-(4-fluoro-1H-pyrazol-1-yl)pyridin-3-yl)ethanamine (S)-1-(6-(4-fluoro-1H-pyrazol-1-yl)pyridin-3-yl)ethanamine 1980023-96-8 C10H11FN4
3-BroMo-5fluoro-4-Methylpyridine 3-BroMo-5fluoro-4-Methylpyridine 1211517-76-8 C6H5BrFN
N'-Hydroxy-2-(pyrrolidin-1-yl)benzimidamide N'-Hydroxy-2-(pyrrolidin-1-yl)benzimidamide C11H15N3O
1-BENZYL-PYRROLIDINE-3-CARBONITRILE 1-BENZYL-PYRROLIDINE-3-CARBONITRILE 10603-52-8 C12H14N2
6-Bromo-5-fluoro-2-pyridinecarboxylic acid 6-Bromo-5-fluoro-2-pyridinecarboxylic acid 1052714-46-1 C6H3BrFNO2
4-(2,2':6',2''-TERPYRIDIN-4'-YL)BENZALDEHYDE 4-(2,2':6',2''-TERPYRIDIN-4'-YL)BENZALDEHYDE 138253-30-2 C22H15N3O
2-Amino-3-cyanopyridine-5-boronic Acid Pinacol Ester 2-Amino-3-cyanopyridine-5-boronic Acid Pinacol Ester 1246372-66-6 C12H16BN3O2
5-Bromo-4-methyl-1H-pyrrolo[2,3-b]pyridine 5-Bromo-4-methyl-1H-pyrrolo[2,3-b]pyridine 1150617-52-9 C8H7BrN2
5,6,7,8-Tetrahydro-1,7-naphthyridine hydrochloride 5,6,7,8-Tetrahydro-1,7-naphthyridine hydrochloride 1338707-67-7 C8H11ClN2
sacubitril sacubitril 1038924-61-6 C17H17NO
Methyl 2-(hydroxymethyl)nicotinate Methyl 2-(hydroxymethyl)nicotinate 1697289-97-6 C8H9NO3
(1H-PYRROLO[2,3-B]PYRIDIN-5-YL)-METHANOL (1H-PYRROLO[2,3-B]PYRIDIN-5-YL)-METHANOL 849067-97-6 C8H8N2O
5-BROMO-3-CHLORO-2-METHYLPYRIDINE 5-BROMO-3-CHLORO-2-METHYLPYRIDINE 914358-72-8 C6H5BrClN
Pyrazolo[1,5-a]pyridine Pyrazolo[1,5-a]pyridine 274-56-6 C7H6N2
xylocytidine xylocytidine 3530-56-1 C9H13N3O5
5-BROMO-2-METHOXY-3-METHYLPYRIDINE 5-BROMO-2-METHOXY-3-METHYLPYRIDINE 760207-87-2 C7H8BrNO
7-bromo-[1,2,4]triazolo[1,5-a]pyridin-2-amine 7-bromo-[1,2,4]triazolo[1,5-a]pyridin-2-amine 882521-63-3 C6H5BrN4
5-Methylpyridine-2,3-dicarboxylic acid dimethyl ester 5-Methylpyridine-2,3-dicarboxylic acid dimethyl ester 112110-16-4 C10H11NO4
5-BROMO-1H-PYRAZOLO[3,4-B]PYRIDIN-3-YLAMINE 5-BROMO-1H-PYRAZOLO[3,4-B]PYRIDIN-3-YLAMINE 405224-24-0 C6H5BrN4
4-Bromo-2,2''-bipyridine 4-Bromo-2,2''-bipyridine 14162-95-9 C10H7BrN2
1-([1,2,4]triazolo[1,5-a]pyridin-6-yl)-2-(6-methylpyridin-2-yl)ethane-1,2-dione 1-([1,2,4]triazolo[1,5-a]pyridin-6-yl)-2-(6-methylpyridin-2-yl)ethane-1,2-dione 356560-84-4 C14H10N4O2
2-chloro-5-methylpyridin-4-amine 2-chloro-5-methylpyridin-4-amine 79055-62-2 C6H7ClN2
S-23 S-23 1010396-29-8 C18H13ClF4N2O3
2-Chloro-5-pyridineacetonitrile 2-Chloro-5-pyridineacetonitrile 39891-09-3 C7H5ClN2
(R)-7-(benzyloxy)- 3,4,12,12a-tetrahydro- 1H-[1,4]oxazino[3,4- c]pyrido[2,1-f][1,2,4]- triazine-6,8-dione (R)-7-(benzyloxy)- 3,4,12,12a-tetrahydro- 1H-[1,4]oxazino[3,4- c]pyrido[2,1-f][1,2,4]- triazine-6,8-dione 1985607-70-2 C17H17N3O4
2-FLUORO-5-(HYDROXYMETHYL)PYRIDINE 2-FLUORO-5-(HYDROXYMETHYL)PYRIDINE 39891-05-9 C6H6FNO
3,5-Dibromopyridine-4-carboxaldehyde 3,5-Dibromopyridine-4-carboxaldehyde 70201-42-2 C6H3Br2NO
3,5-DIBROMOPICOLINIC ACID 3,5-DIBROMOPICOLINIC ACID 61830-40-8 C6H3Br2NO2
2-CHLORO-6-METHYLPYRIDINE-3-BORONIC ACID 2-CHLORO-6-METHYLPYRIDINE-3-BORONIC ACID 536693-95-5 C6H7BClNO2
2-(2,4-DIFLUOROPHENOXY)-3-NITROPYRIDINE 2-(2,4-DIFLUOROPHENOXY)-3-NITROPYRIDINE 175135-62-3 C11H6F2N2O3
2-Benzoylpyridine 2-Benzoylpyridine 91-02-1 C12H9NO
2-(2-FLUOROPHENOXY)-3-NITROPYRIDINE 2-(2-FLUOROPHENOXY)-3-NITROPYRIDINE 175135-65-6 C11H7FN2O3
1H-PYRAZOLO[3,4-B]PYRIDINE, 3-BROMO- 1H-PYRAZOLO[3,4-B]PYRIDINE, 3-BROMO- 68618-36-0 C6H4BrN3
5,6-Dimethoxy-2-(4-piperidinylmethyl)-1-indanone hydrochloride 5,6-Dimethoxy-2-(4-piperidinylmethyl)-1-indanone hydrochloride 120013-39-0 C17H24ClNO3
5-Methy-2-Chloro-4-pyridylboronic acid 5-Methy-2-Chloro-4-pyridylboronic acid
4-Bromopyridine-3-carboxaldehyde 4-Bromopyridine-3-carboxaldehyde 154105-64-3 C6H4BrNO
4-(5-Nitropyridin-2-yl)morpholine 4-(5-Nitropyridin-2-yl)morpholine 26820-62-2 C9H11N3O3
3-AMINOMETHYL-6-(TRIFLUOROMETHYL)PYRIDINE 3-AMINOMETHYL-6-(TRIFLUOROMETHYL)PYRIDINE 387350-39-2 C7H7F3N2
3-Bromo-4-trifluoromethylpyridine 3-Bromo-4-trifluoromethylpyridine 936841-70-2 C6H3BrF3N
(6-Methylpyridin-3-yl)methanol (6-Methylpyridin-3-yl)methanol 34107-46-5 C7H9NO
2H-Pyrrolo[3,2-c]pyridin-2-one,1,3-dihydro-(9CI) 2H-Pyrrolo[3,2-c]pyridin-2-one,1,3-dihydro-(9CI) 134682-54-5 C7H6N2O
3-Fluoropyridine-4-carbonitrile 3-Fluoropyridine-4-carbonitrile 113770-88-0 C6H3FN2
3,4,5-TRIBROMOPYRIDINE 3,4,5-TRIBROMOPYRIDINE 2457-48-9 C5H2Br3N
2-CYANO-3-(3-PYRIDINYL)ACRYLIC ACID 2-CYANO-3-(3-PYRIDINYL)ACRYLIC ACID 103029-74-9 C9H6N2O2
6-(2,2,2-TRIFLUOROETHOXY)PYRIDINE-3-CARBONITRILE 6-(2,2,2-TRIFLUOROETHOXY)PYRIDINE-3-CARBONITRILE 159981-18-7 C8H5F3N2O
4-(2-(5-Ethyl-2-pyridyl)ethoxy)nitrobenzene 4-(2-(5-Ethyl-2-pyridyl)ethoxy)nitrobenzene 85583-54-6 C15H16N2O3
2-chloro-5-(trifluoromethyl)pyridine-3-boronic acid 2-chloro-5-(trifluoromethyl)pyridine-3-boronic acid 536693-96-6 C6H4BClF3NO2
5-FLUORO-2,3-DIHYDRO-(1H)-INDOLE 5-FLUORO-2,3-DIHYDRO-(1H)-INDOLE 94805-51-3 C6H4N2O
6-Trifluoromethyl-pyridine-2-carboxylic acid ethyl ester
6-Trifluoromethyl-pyridine-2-carboxylic acid ethyl ester 1010422-92-0 C9H8F3NO2
2,5-DICHLORO-4-(4,4,5,5-TETRAMETHYL-[1,3,2]-DIOXABOROLAN-2-YL)PYRIDINE 2,5-DICHLORO-4-(4,4,5,5-TETRAMETHYL-[1,3,2]-DIOXABOROLAN-2-YL)PYRIDINE 1073353-98-6 C11H14BCl2NO2
2-(5-bromopyridin-2-yl)acetic acid 2-(5-bromopyridin-2-yl)acetic acid 192642-85-6 C7H6BrNO2
2-Pyridinethiol 1-oxide 2-Pyridinethiol 1-oxide 1121-31-9 C5H5NOS
PYRIDINE, 2-CHLORO-4-HYDRAZINO- PYRIDINE, 2-CHLORO-4-HYDRAZINO- 700811-29-6 C5H6ClN3
4-Phenyl-1,2,3,6-tetrahydropyridine hydrochloride 4-Phenyl-1,2,3,6-tetrahydropyridine hydrochloride 43064-12-6 C11H14ClN
2,3-DICHLORO-5-FORMYLPYRIDINE 2,3-DICHLORO-5-FORMYLPYRIDINE 71690-05-6 C6H3Cl2NO
4-AMINO-3,5-DIBROMO-2-METHYLPYRIDINE 4-AMINO-3,5-DIBROMO-2-METHYLPYRIDINE 126325-54-0 C6H6Br2N2
(6-AMINO-3-PYRIDINYL)METHANOL (6-AMINO-3-PYRIDINYL)METHANOL 113293-71-3 C6H8N2O
(4-CHLORO-BENZYL)-PYRIDIN-3-YLMETHYL-AMINE (4-CHLORO-BENZYL)-PYRIDIN-3-YLMETHYL-AMINE 212392-65-9 C13H13ClN2
2-chloro-6,7-dihydro-5H-pyrrolo[3,4-b]pyridine 2-chloro-6,7-dihydro-5H-pyrrolo[3,4-b]pyridine 810668-57-6 C7H7ClN2
3-bromo-1H-pyrazolo[4,3-c]pyridine 3-bromo-1H-pyrazolo[4,3-c]pyridine 633328-88-8 C6H4BrN3
3-Methoxy-5-nitropyridin-2-ol 3-Methoxy-5-nitropyridin-2-ol 75710-99-5 C6H6N2O4
5-CYANO-3-PYRIDINECARBOXYLIC ACID METHYL ESTER 5-CYANO-3-PYRIDINECARBOXYLIC ACID METHYL ESTER 106726-82-3 C8H6N2O2
6-BROMO-2,2'-BIPYRIDINE 6-BROMO-2,2'-BIPYRIDINE 10495-73-5 C10H7BrN2
2,5-DICHLORO-3-(4,4,5,5-TETRAMETHYL-[1,3,2]-DIOXABOROLAN-2-YL)PYRIDINE 2,5-DICHLORO-3-(4,4,5,5-TETRAMETHYL-[1,3,2]-DIOXABOROLAN-2-YL)PYRIDINE 1073371-98-8 C11H14BCl2NO2
6-Amino-2,2-dimethyl-2H-pyrido[3,2-B][1,4]oxazin-3(4H)-one 6-Amino-2,2-dimethyl-2H-pyrido[3,2-B][1,4]oxazin-3(4H)-one 1002726-62-6 C9H11N3O2
5-bromo-2-methoxy-3-(trifluoromethyl)pyridine 5-bromo-2-methoxy-3-(trifluoromethyl)pyridine 1214377-42-0 C7H5BrF3NO
4-AMino-5-Methylpyridin-2-ol 4-AMino-5-Methylpyridin-2-ol 95306-64-2 C6H8N2O
4-METHOXYPYRIDINE-2-CARBONITRILE 4-METHOXYPYRIDINE-2-CARBONITRILE 36057-44-0 C7H6N2O
3,4-DIFLUOROPYRIDINE 3,4-DIFLUOROPYRIDINE 82878-63-5 C5H3F2N
N-BOC-1,2,3,6-TETRAHYDROPYRIDINE N-BOC-1,2,3,6-TETRAHYDROPYRIDINE 85838-94-4 C10H17NO2
2-Chloro-5-hydroxypyrimidine 2-Chloro-5-hydroxypyrimidine 4983-28-2 C4H3ClN2O
3-AMINO-2-CHLORO-5-FLUOROPYRIDINE 3-AMINO-2-CHLORO-5-FLUOROPYRIDINE 884495-37-8 C5H4ClFN2
2-Bromo-5-ethynylpyridine 2-Bromo-5-ethynylpyridine 569672-28-2 C7H4BrN
4'-(4-BROMOPHENYL)-2,2':6',2''-TERPYRIDINE 4'-(4-BROMOPHENYL)-2,2':6',2''-TERPYRIDINE 89972-76-9 C21H14BrN3
5-CHLORO-3H-IMIDAZO[4,5-B]PYRIDINE 5-CHLORO-3H-IMIDAZO[4,5-B]PYRIDINE 52090-89-8 C6H4ClN3
5-FLUORO-1H-PYRROLO[2,3-B]PYRIDINE 5-FLUORO-1H-PYRROLO[2,3-B]PYRIDINE 866319-00-8 C7H5FN2
2-Amino-5-bromo-3-(hydroxymethyl)pyridine 2-Amino-5-bromo-3-(hydroxymethyl)pyridine 335031-01-1 C6H7BrN2O
4-broMo-2-(1,1,1-trifluoro-2-Methylpropan-2-yl)pyridine 4-broMo-2-(1,1,1-trifluoro-2-Methylpropan-2-yl)pyridine 1357476-67-5 C9H9BrF3N
4-chloro-N-ethyl-5-(trifluoroMethyl)pyriMidin-2-aMine 4-chloro-N-ethyl-5-(trifluoroMethyl)pyriMidin-2-aMine 1374829-47-6 C7H7ClF3N3
1-PYRIDIN-2-YL-ETHYLAMINE 1-PYRIDIN-2-YL-ETHYLAMINE 42088-91-5 C7H10N2
2-methyl-8-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)benzofuro[2,3-b]pyridine 2-methyl-8-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)benzofuro[2,3-b]pyridine 1609374-04-0 C18H20BNO3
6-CHLORO-1H-PYRROLO[3,2-B]PYRIDINE 6-CHLORO-1H-PYRROLO[3,2-B]PYRIDINE 1021339-19-4 C7H5ClN2
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