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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
N-octylpyridin-4-amine N-octylpyridin-4-amine 64690-19-3 C13H22N2
2-CYANO-4-PYRIDINE CARBOXYLIC ACID METHYL ESTER 2-CYANO-4-PYRIDINE CARBOXYLIC ACID METHYL ESTER 94413-64-6 C8H6N2O2
2-CYANOPYRIDINE-4-BORONIC ACID PINACOL ESTER 2-CYANOPYRIDINE-4-BORONIC ACID PINACOL ESTER 741709-62-6 C12H15BN2O2
2,6-Dimethyl-3,5-dibromopyridine 2,6-Dimethyl-3,5-dibromopyridine 3430-34-0 C7H7Br2N
2-CHLORO-5-FLUORO-4-IODOPYRIDINE 2-CHLORO-5-FLUORO-4-IODOPYRIDINE 884494-49-9 C5H2ClFIN
5-CHLORO-2-FLUORO-4-IODOPYRIDINE 5-CHLORO-2-FLUORO-4-IODOPYRIDINE 659731-48-3 C5H2ClFIN
5-Bromo-2,4-dichloropyridine 5-Bromo-2,4-dichloropyridine 849937-96-8 C5H2BrCl2N
2,3-DIBROMO-5-(TRIFLUOROMETHYL)PYRIDINE 2,3-DIBROMO-5-(TRIFLUOROMETHYL)PYRIDINE 79623-38-4 C6H2Br2F3N
2-(TRIFLUOROMETHYL)-3-PYRIDINECARBOXYLIC ACID ETHYL ESTER 2-(TRIFLUOROMETHYL)-3-PYRIDINECARBOXYLIC ACID ETHYL ESTER 208517-35-5 C9H8F3NO2
3-Bromo-2-pyridinecarboxaldehyde 3-Bromo-2-pyridinecarboxaldehyde 405174-97-2 C6H4BrNO
A 769662 A 769662 844499-71-4 C20H12N2O3S
2,6-Dibromo-4-methylpyridine 2,6-Dibromo-4-methylpyridine 73112-16-0 C6H5Br2N
6-chloropyrido[3,2-b]pyrazine 6-chloropyrido[3,2-b]pyrazine 68236-03-3 C7H4ClN3
tert-butyl 2-chloro-7,8-dihydropyrido[4,3-d]pyrimidine-6(5H)-carboxylate tert-butyl 2-chloro-7,8-dihydropyrido[4,3-d]pyrimidine-6(5H)-carboxylate 1092352-55-0 C12H16ClN3O2
2-HYDROXY-5-(4,4,5,5-TETRAMETHYL-1,3,2-DIOXABOROLAN-2-YL)PYRIDINE 2-HYDROXY-5-(4,4,5,5-TETRAMETHYL-1,3,2-DIOXABOROLAN-2-YL)PYRIDINE 1054483-78-1 C11H16BNO3
2,4-DIBROMO-3-NITROPYRIDINE 2,4-DIBROMO-3-NITROPYRIDINE 121263-10-3 C5H2Br2N2O2
5-HYDROXY-PYRIDINE-2-CARBOXYLIC ACID METHYL ESTER 5-HYDROXY-PYRIDINE-2-CARBOXYLIC ACID METHYL ESTER 30766-12-2 C7H7NO3
2-Chloro-4,6-dimethyl-3-pyridinecarboxylic acid 2-Chloro-4,6-dimethyl-3-pyridinecarboxylic acid 66662-48-4 C8H8ClNO2
3,5-Dichloro-4-Picoline 3,5-Dichloro-4-Picoline 100868-46-0 C6H5Cl2N
2-Bromo-6-Fluoro-4-Picoline 2-Bromo-6-Fluoro-4-Picoline 180608-37-1 C6H5BrFN
6-chloropyridine-3,4-diamine hydrochloride 6-chloropyridine-3,4-diamine hydrochloride 2604-40-2 C5H7Cl2N3
2-HYDROXY-3-AMINO-5-CHLOROPYRIDINE 2-HYDROXY-3-AMINO-5-CHLOROPYRIDINE 98027-36-2 C5H5ClN2O
METHYL 5-BROMO-6-HYDROXYNICOTINATE METHYL 5-BROMO-6-HYDROXYNICOTINATE 381247-99-0 C7H6BrNO3
2-CHLORO-5-FLUOROISONICOTINIC ACID 2-CHLORO-5-FLUOROISONICOTINIC ACID 884494-74-0 C6H3ClFNO2
3-Hydroxy-4-(trifluoromethyl)pyridine 3-Hydroxy-4-(trifluoromethyl)pyridine 936841-71-3 C6H4F3NO
5-Chloro-3,4-diaminopyridine 5-Chloro-3,4-diaminopyridine 929074-42-0 C5H6ClN3
5-Bromo-2-chloro-3-cyanopyridine 5-Bromo-2-chloro-3-cyanopyridine 405224-23-9 C6H2BrClN2
5-BROMO-4-METHYL-PYRIDINE-2,3-DIAMINE 5-BROMO-4-METHYL-PYRIDINE-2,3-DIAMINE 41230-93-7 C6H8BrN3
1,6-Naphthyridin-2(1H)-one,5,6,7,8-tetrahydro-(9CI) 1,6-Naphthyridin-2(1H)-one,5,6,7,8-tetrahydro-(9CI) 676994-64-2 C8H10N2O
2-(Methoxycarbonyl)-4-pyridineboronic acid, pinacol ester 2-(Methoxycarbonyl)-4-pyridineboronic acid, pinacol ester 957062-72-5 C13H18BNO4
6-CHLOROPYRIDINE-2-BORONIC ACID 6-CHLOROPYRIDINE-2-BORONIC ACID 870459-91-9 C5H5BClNO2
THIAZOLO[5,4-B]PYRIDIN-2-AMINE THIAZOLO[5,4-B]PYRIDIN-2-AMINE 31784-70-0 C6H5N3S
2-N-BUTOXYPYRIDINE 2-N-BUTOXYPYRIDINE 27361-16-6 C9H13NO
2-Bromo-3-(bromomethyl)pyridine 2-Bromo-3-(bromomethyl)pyridine 94446-97-6 C6H5Br2N
(6-AMINOPYRIDIN-3-YL)BORONIC ACID (6-AMINOPYRIDIN-3-YL)BORONIC ACID 851524-96-4 C5H7BN2O2
5-NITROPYRIDINE-2,3-DIAMINE 5-NITROPYRIDINE-2,3-DIAMINE 3537-14-2 C5H6N4O2
6-AMINO-PYRIDIN-3-OL HYDROCHLORIDE 6-AMINO-PYRIDIN-3-OL HYDROCHLORIDE 856965-37-2 C5H7ClN2O
7-BENZYL-5,6,7,8-TETRAHYDROPYRIDO[3,4-D]PYRIMIDINE-2,4(1H,3H)-DIONE 7-BENZYL-5,6,7,8-TETRAHYDROPYRIDO[3,4-D]PYRIMIDINE-2,4(1H,3H)-DIONE 62459-02-3 C14H15N3O2
2,3,4,5-Tetrahydro-2,8-dimethyl-5-[2-(6-methyl-3-pyridyl)ethyl]-1H-pyrido[4,3-b]indole dihydrochloride 2,3,4,5-Tetrahydro-2,8-dimethyl-5-[2-(6-methyl-3-pyridyl)ethyl]-1H-pyrido[4,3-b]indole dihydrochloride 97657-92-6 C21H25N3.2ClH
2-Amino-5-bromo-3-(trifluoromethyl)pyridine 2-Amino-5-bromo-3-(trifluoromethyl)pyridine 79456-34-1 C6H4BrF3N2
6-AMINO-3,5-DINITROPYRIDINE 6-AMINO-3,5-DINITROPYRIDINE 3073-30-1 C5H4N4O4
DIMETHYL-PYRIDIN-3-YL-AMINE DIMETHYL-PYRIDIN-3-YL-AMINE 18437-57-5 C7H10N2
4,4'-DIPYRIDYL DISULFIDE 4,4'-DIPYRIDYL DISULFIDE 2645-22-9 C10H8N2S2
3-AMINO-2-PYRIDINE SULFONIC ACID 3-AMINO-2-PYRIDINE SULFONIC ACID 54247-51-7 C5H6N2O3S
2-PYRIDYLHYDROXYMETHANESULFONIC ACID 2-PYRIDYLHYDROXYMETHANESULFONIC ACID 3343-41-7 C6H7NO4S
2-CYCLOPROPYLMETHOXY-3-IODO-PYRIDINE 2-CYCLOPROPYLMETHOXY-3-IODO-PYRIDINE 766557-62-4 C9H10INO
2-(3-HYDROXYCARBONYL-6-PYRIDYL)MALONDIALDEHYDE 2-(3-HYDROXYCARBONYL-6-PYRIDYL)MALONDIALDEHYDE 180615-36-5 C9H7NO4
5,6-Dimethylpyridin-2-amine 5,6-Dimethylpyridin-2-amine 57963-08-3 C7H10N2
3,5-Diethyl-1,2-dihydro-1-phenyl-2-propylpyridine 3,5-Diethyl-1,2-dihydro-1-phenyl-2-propylpyridine 34562-31-7 C18H25N
PYRIDINE-2-THIOAMIDE PYRIDINE-2-THIOAMIDE 5346-38-3 C6H6N2S
2-CYANO-4-METHYL-5-NITROPYRIDINE 2-CYANO-4-METHYL-5-NITROPYRIDINE 267875-30-9 C7H5N3O2
N-FLUORO-4-METHYLPYRIDINIUM-2-SULFONATE N-FLUORO-4-METHYLPYRIDINIUM-2-SULFONATE 147540-88-3 C6H6FNO3S
3-FLUORO-4-NITROPYRIDINE-N-OXIDE 3-FLUORO-4-NITROPYRIDINE-N-OXIDE 769-54-0 C5H3FN2O3
2-BENZYLOXY-5-BROMOPYRIDINE 2-BENZYLOXY-5-BROMOPYRIDINE 83664-33-9 C12H10BrNO
2-FLUORO-3-HYDROXY-6-PICOLINE 2-FLUORO-3-HYDROXY-6-PICOLINE 209328-87-0 C6H6FNO
2-HYDROXYMETHYL-3-METHYLPYRIDINE 2-HYDROXYMETHYL-3-METHYLPYRIDINE 63071-09-0 C7H9NO
2-BROMOPYRIDINE N-OXIDE 2-BROMOPYRIDINE N-OXIDE 14305-17-0 C5H4BrNO
N-(6-CHLORO-PYRIDIN-2-YL)-2,2-DIMETHYL-PROPIONAMIDE N-(6-CHLORO-PYRIDIN-2-YL)-2,2-DIMETHYL-PROPIONAMIDE 86847-84-9 C10H13ClN2O
5-CHLORO-2-HYDROXY-3-METHYLPYRIDINE 5-CHLORO-2-HYDROXY-3-METHYLPYRIDINE 58498-61-6 C6H6ClNO
N-BOC-3-AMINOMETHYLPYRIDINE  97 N-BOC-3-AMINOMETHYLPYRIDINE 97 102297-41-6 C11H16N2O2
3-Cyanopyridine N-oxide 3-Cyanopyridine N-oxide 149060-64-0 C6H4N2O
Ethyl 2-chloro-5-fluoronicotinate Ethyl 2-chloro-5-fluoronicotinate 139911-30-1 C8H7ClFNO2
2-Amino-4-ethoxypyridine 2-Amino-4-ethoxypyridine 52311-20-3 C7H10N2O
4-AMINO-5-BROMO-2-METHYLPYRIDINE 4-AMINO-5-BROMO-2-METHYLPYRIDINE 10460-50-1 C6H7BrN2
Methyl 6-methoxynicotinate Methyl 6-methoxynicotinate 26218-80-4 C8H9NO3
4-(Pyridin-3-yl)benzaldehyde 4-(Pyridin-3-yl)benzaldehyde 127406-55-7 C12H9NO
4-(4,4-DIMETHYL-PIPERIDIN-1-YL)-BENZOIC ACID 4-(4,4-DIMETHYL-PIPERIDIN-1-YL)-BENZOIC ACID 406233-26-9 C14H19NO2
5-BROMO-2-HYDROXY-4-PYRIDINECARBOXYLIC ACID 5-BROMO-2-HYDROXY-4-PYRIDINECARBOXYLIC ACID 913836-16-5 C6H4BrNO3
methyl 6-methylpyridine-2-carboxylate methyl 6-methylpyridine-2-carboxylate 13602-11-4 C8H9NO2
5-bromo-6-methyl-3-nitropyridin-2-amine 5-bromo-6-methyl-3-nitropyridin-2-amine 68957-50-6 C6H6BrN3O2
2-Bromo-3-chloro-5-hydroxypyridine 2-Bromo-3-chloro-5-hydroxypyridine 130284-56-9 C5H3BrClNO
2-Iodo-5-trifluoromethylpyridine 2-Iodo-5-trifluoromethylpyridine 100366-75-4 C6H3F3IN
3,4,5-Trichloropyridine-2-carboxylic acid 3,4,5-Trichloropyridine-2-carboxylic acid 5439-04-3 C6H2Cl3NO2
6-Aminopyridine-2-carboxylic acid ethyl ester 6-Aminopyridine-2-carboxylic acid ethyl ester 69142-64-9 C8H10N2O2
2-Methylthiopyridine 2-Methylthiopyridine 18438-38-5 C6H7NS
4-NITRO-2,3,5-TRIMETHYLPYRIDINE-N-OXIDE 4-NITRO-2,3,5-TRIMETHYLPYRIDINE-N-OXIDE 86604-79-7 C8H10N2O3
4-[4-CHLORO-3-(TRIFLUOROMETHYL)PHENYL]-3-THIOSEMICARBAZIDE 4-[4-CHLORO-3-(TRIFLUOROMETHYL)PHENYL]-3-THIOSEMICARBAZIDE 38901-30-3 C8H7ClF3N3S
5-IODO-3-(TRIFLUOROMETHYL)-2(1H)-PYRIDINONE 5-IODO-3-(TRIFLUOROMETHYL)-2(1H)-PYRIDINONE 887707-23-5 C6H3F3INO
2,3-DIHYDRO[1,4]DIOXINO[2,3-C]PYRIDINE-7-CARBALDEHYDE 2,3-DIHYDRO[1,4]DIOXINO[2,3-C]PYRIDINE-7-CARBALDEHYDE 443955-90-6 C8H7NO3
4-BROMO-1-METHYLPYRIDIN-2(1H)-ONE 4-BROMO-1-METHYLPYRIDIN-2(1H)-ONE 214342-63-9 C6H6BrNO
2-Amino-5-chloropyridine-3-carboxylic acid 2-Amino-5-chloropyridine-3-carboxylic acid 52833-93-9 C6H5ClN2O2
2-Bromo-3,5-dimethylpyridine 2-Bromo-3,5-dimethylpyridine 92992-85-3 C7H8BrN
6-(TRIFLUOROMETHYL)PYRIDINE-3-METHANOL 6-(TRIFLUOROMETHYL)PYRIDINE-3-METHANOL 386704-04-7 C7H6F3NO
3-NITRO-4-BROMOPYRIDINE 3-NITRO-4-BROMOPYRIDINE 23056-44-2 C5H3BrN2O2
2-(4-CHLOROPHENOXY)-3-NITROPYRIDINE 2-(4-CHLOROPHENOXY)-3-NITROPYRIDINE 76893-45-3 C11H7ClN2O3
2-ETHOXY-3-IODO-PYRIDINE 2-ETHOXY-3-IODO-PYRIDINE 766557-60-2 C7H8INO
4-CHLORO3-PYRIDYLBORONIC ACID 4-CHLORO3-PYRIDYLBORONIC ACID 452972-10-0 C5H5BClNO2
5-METHYLPICOLINIC ACID 5-METHYLPICOLINIC ACID 4434-13-3 C7H7NO2
2,6-DIMETHYL-PYRIDINE-3-CARBALDEHYDE 2,6-DIMETHYL-PYRIDINE-3-CARBALDEHYDE 650141-20-1 C8H9NO
METHYL 4-HYDROXY-6-(TRIFLUOROMETHYL)THIENO[3,4-B]PYRIDINE-1-CARBOXYLATE METHYL 4-HYDROXY-6-(TRIFLUOROMETHYL)THIENO[3,4-B]PYRIDINE-1-CARBOXYLATE 175203-39-1 C10H6F3NO3S
2-METHOXY-4-METHYL-PYRIDINE-5-BORONIC ACID 2-METHOXY-4-METHYL-PYRIDINE-5-BORONIC ACID 503184-35-8 C7H10BNO3
2-N-Boc-amino-3-formylpyridine 2-N-Boc-amino-3-formylpyridine 116026-94-9 C11H14N2O3
3,5-DIBROMO-2,4,6-TRIMETHYLPYRIDINE 3,5-DIBROMO-2,4,6-TRIMETHYLPYRIDINE 29976-56-5 C8H9Br2N
3,5,6-TRIFLUORO-2-HYDROXYPYRIDINE 3,5,6-TRIFLUORO-2-HYDROXYPYRIDINE 75777-49-0 C5H2F3NO
METHYL 6-AMINO-5-BROMONICOTINATE METHYL 6-AMINO-5-BROMONICOTINATE 180340-70-9 C7H7BrN2O2
2,3-DICHLOROPYRIDINE-5-BORONIC ACID 2,3-DICHLOROPYRIDINE-5-BORONIC ACID 1072944-15-0 C5H4BCl2NO2
4-CHLORO-2,3,5,6-TETRAFLUOROPYRIDINE 4-CHLORO-2,3,5,6-TETRAFLUOROPYRIDINE 52026-98-9 C5ClF4N
2-ETHYL-6-ISOPROPYLPYRIDINE 2-ETHYL-6-ISOPROPYLPYRIDINE 74701-47-6 C10H15N
5,6-DICHLORONICOTINIC ACID ETHYL ESTER 5,6-DICHLORONICOTINIC ACID ETHYL ESTER 401566-69-6 C8H7Cl2NO2
2-(4-FLUOROPHENOXY)-3-NITROPYRIDINE 2-(4-FLUOROPHENOXY)-3-NITROPYRIDINE 147143-58-6 C11H7FN2O3
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