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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-ETHOXY-4-PYRIDINECARBOXYLIC ACID 2-ETHOXY-4-PYRIDINECARBOXYLIC ACID 91940-86-2 C8H9NO3
3-NITRO-2-PYRIDINESULFENYL CHLORIDE 3-NITRO-2-PYRIDINESULFENYL CHLORIDE 68206-45-1 C5H3ClN2O2S
(5-METHYLPYRIDIN-3-YL)METHANOL (5-METHYLPYRIDIN-3-YL)METHANOL 102074-19-1 C7H9NO
2,5-DiaMinopyridine hydrochloride 2,5-DiaMinopyridine hydrochloride 119261-84-6 C5H8ClN3
N-(3,5-Dichloro-4-pyridinyl)-3,4-bis(difluoroMethoxy)benzaMide N-(3,5-Dichloro-4-pyridinyl)-3,4-bis(difluoroMethoxy)benzaMide 162401-30-1 C14H8Cl2F4N2O3
ALPHA-PYRIDOIN ALPHA-PYRIDOIN 1141-06-6 C12H10N2O2
4-ETHOXYPYRIDINE 4-ETHOXYPYRIDINE 33399-46-1 C7H9NO
4-CHLORO-N,N-DIMETHYL-PYRIDINE-2-CARBOXAMIDE 4-CHLORO-N,N-DIMETHYL-PYRIDINE-2-CARBOXAMIDE 114780-06-2 C8H9ClN2O
2-(1-PYRROLIDINYL)NICOTINIC ACID 2-(1-PYRROLIDINYL)NICOTINIC ACID 690632-36-1 C10H12N2O2
3-Chloro-2-(trimethylsilyl)pyridine 3-Chloro-2-(trimethylsilyl)pyridine 79698-47-8 C8H12ClNSi
3-[(4-PYRIDYLMETHYL)AMINO]PROPANENITRILE 3-[(4-PYRIDYLMETHYL)AMINO]PROPANENITRILE 648409-30-7 C9H11N3
1H-Pyrrolo[2,3-b]pyridine, 4,5-difluoro-1-[tris(1-methylethyl)silyl]- 1H-Pyrrolo[2,3-b]pyridine, 4,5-difluoro-1-[tris(1-methylethyl)silyl]- 685513-89-7 C16H24F2N2Si
3-Pyridinemethanol, 4-(4-fluoro-2-hydroxyphenyl)-a-methyl-2,6-bis(1-methylethyl)-5-propyl-, (aR,4S)-rel- (9CI) 3-Pyridinemethanol, 4-(4-fluoro-2-hydroxyphenyl)-a-methyl-2,6-bis(1-methylethyl)-5-propyl-, (aR,4S)-rel- (9CI) 202917-18-8 C22H30FNO2
2-Pyridin-4-ylacetohydrazide 2-Pyridin-4-ylacetohydrazide 69583-00-2 C7H9N3O
5-BROMO-2-HYDROXY-4-METHYL-3-NITROPRIDINE 5-BROMO-2-HYDROXY-4-METHYL-3-NITROPRIDINE
(6-chloropyridin-2-yl)methanamine (6-chloropyridin-2-yl)methanamine C6H7ClN2
4-(2-aminoethyl)pyridine dihydrochloride 4-(2-aminoethyl)pyridine dihydrochloride C7H12Cl2N2
N-methyl 2-bromo-5-pyridinecarboxamide N-methyl 2-bromo-5-pyridinecarboxamide 869640-48-2 C7H7BrN2O
3-Pyridinecarbonyl chloride, 2-fluoro- (9CI) 3-Pyridinecarbonyl chloride, 2-fluoro- (9CI) 119899-26-2 C6H3ClFNO
2-BROMO-5-FLUORO-3-NITRO-4-PICOLINE 2-BROMO-5-FLUORO-3-NITRO-4-PICOLINE 917918-84-4 C6H4BrFN2O2
5,6,7,8-tetrahydro-2,6-naphthyridin-1-amine 5,6,7,8-tetrahydro-2,6-naphthyridin-1-amine 601515-40-6 C8H11N3
3-(2-Chloroethyl)-2-Methyl-6,7,8,9-Tetrahydro-4H-Pyrido[1,2-a]-Pyrimidin-4-One 3-(2-Chloroethyl)-2-Methyl-6,7,8,9-Tetrahydro-4H-Pyrido[1,2-a]-Pyrimidin-4-One C11H15ClN2O
5-Bromo-3-fluoro-2-hydroxypyridine 5-Bromo-3-fluoro-2-hydroxypyridine C5H3BrFNO
2-Bromo-3-fluoropyridine 2-Bromo-3-fluoropyridine C5H3BrFN
2,5-DICHLORO-4-HYDROXYPYRIDINE 2,5-DICHLORO-4-HYDROXYPYRIDINE 343781-57-7 C5H3Cl2NO
Ethyl 3-(trifluoromethyl)picolinate Ethyl 3-(trifluoromethyl)picolinate 952182-76-2 C9H8F3NO2
3-Pyridinecarbonitrile,2-methoxy-5-methyl-(9CI) 3-Pyridinecarbonitrile,2-methoxy-5-methyl-(9CI) 149379-73-7 C8H8N2O
4-Pyridinecarboxamide,2-cyano-(9CI) 4-Pyridinecarboxamide,2-cyano-(9CI) 98273-47-3 C7H5N3O
3-Pyridinamine,6-chloro-N-methyl-(9CI) 3-Pyridinamine,6-chloro-N-methyl-(9CI) 120739-84-6 C6H7ClN2
2-(3-IODO-PYRIDIN-2-YLAMINO)-ETHANOL 2-(3-IODO-PYRIDIN-2-YLAMINO)-ETHANOL C7H9IN2O
(R)-(+)-Ketorolac (R)-(+)-Ketorolac 66635-93-6 C15H13NO3
1,6-Dihydro-4-hydroxy-2-methyl-6-(oxo)nicotinic acid ethyl ester 1,6-Dihydro-4-hydroxy-2-methyl-6-(oxo)nicotinic acid ethyl ester 3950-10-5 C9H11NO4
3-ACETYL-BENZOIC ACID METHYL ESTER 3-ACETYL-BENZOIC ACID METHYL ESTER 915402-27-6 C8H7N3O
(2,5-DIFLUOROPYRIDIN-3-YL)BORONIC ACID (2,5-DIFLUOROPYRIDIN-3-YL)BORONIC ACID 872041-95-7 C5H4BF2NO2
3-PYRIDINAMINE, 6-CHLORO-5-IODO- 3-PYRIDINAMINE, 6-CHLORO-5-IODO- 444902-32-3 C5H4ClIN2
6-Chloropyridine-2-carboxylic acid amide 6-Chloropyridine-2-carboxylic acid amide 7059-61-2 C24H16F2O2
2-Hydroxy-5-methyl-benzaldehyde 2-Hydroxy-5-methyl-benzaldehyde 859926-11-7 C10H8N2.C8H8O2
6-Bromo-2,3-dihydroimidazo[1,2-a]pyridine 6-Bromo-2,3-dihydroimidazo[1,2-a]pyridine 793628-63-4 C7H7BrN2
2,3-difluoro-5-iodopyridine 2,3-difluoro-5-iodopyridine C5H2F2IN
4,5-Dihydroxy-pyridine-2-carboxylic acid 4,5-Dihydroxy-pyridine-2-carboxylic acid 43077-77-6 C6H5NO4
Doxylamine N-Oxide Doxylamine N-Oxide 97143-65-2 C17H22N2O2
Dichloro[1,3-bis(2,4,6-trimethylphenyl)-2-imidazolidinylidene](benzylidene)bis(3-bromopyridine)ruthenium(II) Dichloro[1,3-bis(2,4,6-trimethylphenyl)-2-imidazolidinylidene](benzylidene)bis(3-bromopyridine)ruthenium(II) 900169-53-1 C38H39Br2Cl2N4Ru
3-Bromo-2-chloro-4-methyl-5-nitropyridine 3-Bromo-2-chloro-4-methyl-5-nitropyridine 1049706-73-1 C6H4BrClN2O2
4-bromo-6-chloropicolinic acid 4-bromo-6-chloropicolinic acid 1060805-66-4 C6H3BrClNO2
133391-63-6 133391-63-6 133391-63-6
GSK269962A GSK269962A 850664-21-0 C29H30N8O5
2-chloro-3-(trifluoroMethyl)-4-iodopyridine 2-chloro-3-(trifluoroMethyl)-4-iodopyridine 1227603-55-5 C6H2ClF3IN
2,3,6-Trichloro-5-nitro-pyridine 2,3,6-Trichloro-5-nitro-pyridine 55304-72-8 C5HCl3N2O2
N-[4-[(2-Amino-3-chloropyridin-4-yl)oxy]-3-fluorophenyl]-4-ethoxy-1-(4-fluorophenyl)-2-oxo-1,2-dihydropyridine-3-carboxamide N-[4-[(2-Amino-3-chloropyridin-4-yl)oxy]-3-fluorophenyl]-4-ethoxy-1-(4-fluorophenyl)-2-oxo-1,2-dihydropyridine-3-carboxamide 1025720-94-8 C25H19ClF2N4O4
7,8-dihydro-8-oxo-7-phenyl-pyrido[2,3-d]pyridazine-5-carboxylic acid 7,8-dihydro-8-oxo-7-phenyl-pyrido[2,3-d]pyridazine-5-carboxylic acid 13694-12-7 C14H9N3O3
6-fluoropyridine-3-sulfonyl chloride 6-fluoropyridine-3-sulfonyl chloride 1025509-80-1 C5H3ClFNO2S
2,6-Bis[1-[(2,6-diMethylphenyl)iMino]ethyl]pyridine 2,6-Bis[1-[(2,6-diMethylphenyl)iMino]ethyl]pyridine 204203-16-7 C25H27N3
5-BroMo-4-hydroxynicotinic acid 5-BroMo-4-hydroxynicotinic acid 1052114-83-6 C6H4BrNO3
 Alpelisib (BYL719) Alpelisib (BYL719) 1217486-61-7 C19H22F3N5O2S
3-bromo-2-(bromomethyl)-6-chloropyridine 3-bromo-2-(bromomethyl)-6-chloropyridine 547756-20-7 C6H4Br2ClN
N-(2-bromophenyl)-2-chloropyridine-4-carboxamide N-(2-bromophenyl)-2-chloropyridine-4-carboxamide 1019323-14-8 C12H8BrClN2O
5-Fluoro-2-methoxypyridine-4-boric acid 5-Fluoro-2-methoxypyridine-4-boric acid C6H7BFNO4
1H-Pyrrolo[2,3-b]pyridine-5-methanol, a,a-dimethyl-1-[tris(1-methylethyl)silyl]- 1H-Pyrrolo[2,3-b]pyridine-5-methanol, a,a-dimethyl-1-[tris(1-methylethyl)silyl]- 918523-63-4 C19H32N2OSi
2-Fluoronicotinamide 2-Fluoronicotinamide 364-22-7 C6H5FN2O
Acetamide,N-(2-methyl-4-pyridinyl)- Acetamide,N-(2-methyl-4-pyridinyl)- 18085-47-7 C8H10N2O
6-NITROPYRIDINE-2-CARBOXAMIDE 6-NITROPYRIDINE-2-CARBOXAMIDE 60278-80-0 C6H5N3O3
4-(BROMOMETHYL)-2-CHLOROPYRIDINE 4-(BROMOMETHYL)-2-CHLOROPYRIDINE 83004-15-3 C6H5BrClN
2-(CHLOROMETHYL)NICOTINONITRILE 2-(CHLOROMETHYL)NICOTINONITRILE 848774-96-9 C7H5ClN2
Pyridine, 2-fluloro-4-chloro-5-iodo- Pyridine, 2-fluloro-4-chloro-5-iodo- C5H2ClFIN
5-Boc-2-Methyl-6,7-dihydrothiazolo[5,4-c]pyridine 5-Boc-2-Methyl-6,7-dihydrothiazolo[5,4-c]pyridine 220388-97-6 C12H18N2O2S
5-[4-(1-Methylethoxy)phenyl]-2-pyridinamine 5-[4-(1-Methylethoxy)phenyl]-2-pyridinamine 1044239-22-6 C14H16N2O
5,6-Dimethoxypicolinonitrile 5,6-Dimethoxypicolinonitrile 1112851-50-9 C8H8N2O2
2-Hydroxy-3-trifluoromethyl-5-iodopyridine 2-Hydroxy-3-trifluoromethyl-5-iodopyridine C6H3F3INO
3-Pyridinamine, 2-methoxy-N-(1-methylethyl)- 3-Pyridinamine, 2-methoxy-N-(1-methylethyl)- 112777-37-4 C9H14N2O
2,3-difluoro-4-hydroxypyridine 2,3-difluoro-4-hydroxypyridine 1227579-00-1 C5H3F2NO
3,5-difluoro-4-iodopyridine 3,5-difluoro-4-iodopyridine 1116099-07-0 C5H2F2IN
2,3,5,6-tetrachloropyridin-4-amine 2,3,5,6-tetrachloropyridin-4-amine 3872176-63-8 C5H2Cl4N2
ABT-279 ABT-279 676559-83-4 C21H25N5O3
N-CBZ-1,2,3,6-tetrahydropyridin-4-ylboronic acid N-CBZ-1,2,3,6-tetrahydropyridin-4-ylboronic acid 1251537-33-3 C13H16BNO4
2-chloro-5-hydroxyisonicotinaldehyde 2-chloro-5-hydroxyisonicotinaldehyde 1060804-53-6 C6H4ClNO2
5-chloropyridine-3-sulfonyl chloride 5-chloropyridine-3-sulfonyl chloride 1060802-18-7 C5H3Cl2NO2S
2-CHLOROMETHYL-4-METHYLPYRIDINE 2-CHLOROMETHYL-4-METHYLPYRIDINE 38198-16-2 C7H8ClN
3-AMINO-6-BROMO-2-PHENYLPYRIDINE 3-AMINO-6-BROMO-2-PHENYLPYRIDINE 912772-85-1 C11H9BrN2
2-(4-BROMOPHENYL)-6-IODOIMIDAZO(1 2-A)P& 2-(4-BROMOPHENYL)-6-IODOIMIDAZO(1 2-A)P& 118000-66-1 C13H8BrIN2
5-METHYL-2-THIOXO-1,2-DIHYDROPYRIDINE-3-CARBONITRILE 5-METHYL-2-THIOXO-1,2-DIHYDROPYRIDINE-3-CARBONITRILE 87373-59-9 C7H6N2S
5-CYANO-2-FIUORO-6-PICOLINE 5-CYANO-2-FIUORO-6-PICOLINE C7H5FN2
3,5-DINITROPYRIDIN-4-AMINE 3,5-DINITROPYRIDIN-4-AMINE C5H4N4O4
2,6-PYRIDINEDICARBOXAMIDE 2,6-PYRIDINEDICARBOXAMIDE 4663-97-2 C7H7N3O2
2-(4-Bromomethylphenyl)pyridine 2-(4-Bromomethylphenyl)pyridine 257907-04-3 C12H10BrN
1-(3-Bromopyridin-4-yl)ethanone 1-(3-Bromopyridin-4-yl)ethanone 111043-06-2 C7H6BrNO
1-(6-FLUOROPYRIDIN-3-YL)ETHANONE 1-(6-FLUOROPYRIDIN-3-YL)ETHANONE C7H6FNO
3-CHLORO-2-FLUORO-4-(4,4,5,5-TETRAMETHYL-[1,3,2]DIOXABOROLAN-2-YL)PYRIDINE 3-CHLORO-2-FLUORO-4-(4,4,5,5-TETRAMETHYL-[1,3,2]DIOXABOROLAN-2-YL)PYRIDINE 1073353-71-5 C11H14BClFNO2
2-Amino-6,7-dihydro-5H-1-pyrindine 2-Amino-6,7-dihydro-5H-1-pyrindine 146331-19-3 C8H10N2
3-Chloropyridine-2-carboxamide 3-Chloropyridine-2-carboxamide 114080-95-4 C6H5ClN2O
2-(4-iodopyridin-2-ylamino)acetamide 2-(4-iodopyridin-2-ylamino)acetamide 1210646-12-0 C7H8IN3O
Boc-2-benzylpyridin-3-ylcarbamate Boc-2-benzylpyridin-3-ylcarbamate 1260810-99-8 C18H20N2O4
2-Bromo-3-iodo-4-methyl pyridine 2-Bromo-3-iodo-4-methyl pyridine 884494-42-2 C6H5BrIN
Furo[2,3-b]pyridin-3-ol, 2,3-dihydro- (9CI) Furo[2,3-b]pyridin-3-ol, 2,3-dihydro- (9CI) 144186-57-2 C7H7NO2
Pyridine, 5-bromo-2-(bromomethyl)- (9CI) Pyridine, 5-bromo-2-(bromomethyl)- (9CI) 145218-19-5 C6H5Br2N
Pyridine, 2-(bromomethyl)-5-chloro- (9CI) Pyridine, 2-(bromomethyl)-5-chloro- (9CI) 605681-01-4 C6H5BrClN
2,3-DICHLORO-5-IODOPYRIDINE 2,3-DICHLORO-5-IODOPYRIDINE 97966-01-3 C5H2Cl2IN
2-Pyridinol,4-methoxy-(9CI) 2-Pyridinol,4-methoxy-(9CI) 95907-06-5 C6H7NO2
3-Pyridinecarbonitrile,6-(methylthio)-(9CI) 3-Pyridinecarbonitrile,6-(methylthio)-(9CI) 408350-80-1 C7H6N2S
1H-Pyrrolo[2,3-c]pyridin-7-amine(9CI) 1H-Pyrrolo[2,3-c]pyridin-7-amine(9CI) 165669-36-3 C7H7N3
3-Pyridinemethanamine,2-amino-(9CI) 3-Pyridinemethanamine,2-amino-(9CI) 144288-48-2 C6H9N3
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