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Heterocyclic compound

Heterocyclic compounds are a class of organic compounds with cyclic structure. The ring-constituting atoms in the molecule, in addition to carbon, also include one or more nitrogen, sulfur, oxygen and other atoms. Those containing one ring are called single-heterocyclic compounds, such as furan, thiazole, and pyridine. Those containing two or more rings are called fused heterocyclic compounds such as quinoline and purine. The most common and most stable are five- or six-membered heterocyclic ring. Simple heterocyclic ring is capable of merging with benzene or another heterocyclic ring to form a bicyclic, tricyclic or more complex ring system. Some kinds of heterocyclic rings have features of aromatic compounds, such as being easy to participate into substitution reaction, difficult to have addition reaction and being stable to oxidant. Heterocyclic compounds are widely found in nature, such as nucleic acids, most kinds of vitamins, chlorophyll, heme, most kinds of alkaloids, pigments and so on. A fraction of the heterocyclic compounds have aromatic characteristics, such as plants coumarone, jasmonate and animals civetone. There are many synthetic pesticides that belong to such compounds such as herbicides atrazine, amitrole, CMPT, insecticide fluorine propargite, quinoline parathion, thioquinox and so on. Simple heterocyclic compound is an important raw material of organic chemical industry.

The cyclic compounds with atoms constituting the ring system, in addition to carbon atom, also containing O, S, and N heteroatom are collectively referred to as heterocyclic compounds. According to this definition, the cyclic dicarboxylic anhydride, the cyclic imide, lactones, lactides, cyclic anhydrides, lactams, and cyclic ethers, strictly speaking, also belong to heterocyclic compounds. However, due to the nature of these compounds are similar with aliphatic compound, and can easily undergo either the cyclization of the open-chain compounds or ring open reaction to be transformed into chain compounds, thus being generally attributed to the aliphatic chemistry for discussion. Therefore, heterocyclic compounds generally refer specifically to those heterocyclic compounds with relatively stable ring system but different levels of aromatic properties, namely aromatic heterocyclic compound.

The organic heterocyclic compounds belong to a large class in the three large categories of organic compounds, open chain, carbocyclic and heterocyclic organic compounds. It contains various kinds and has a large number accounting for about one-third of all known organic compounds and is also widespread in the biosphere, having close relation with the biological growth, development, reproduction, and genetic variation and so on. Common heterocyclic compounds include furan, thiophene, pyrrole, pyridine, quinoline, carbazole and so on.

These kinds of heterocyclic compounds are widely used in organic synthesis or as pharmaceuticals, pesticides, solvents and so on. They are colorless liquids with special smell or crystallization and have specific gravity being less than or close to water. They are toxic and can be soluble in some organic solvents and slightly soluble in water. In case of fire, heat, oxidants and strong acids, it can cause fire or explosion with simultaneous deposition of toxic sulfur dioxide or nitrogen oxide gas. Furan, when being exposed to the air, is capable of forming peroxides with causing an explosion during distillation. In the management of dangerous goods, according to the risk grades of fire, explosion, toxicity risk, they were classified as flammable liquids, flammable solids and organic toxic chemicals; when used in the reservoir, the first two comply danger of the A and B class while the latter one is based on class C fire danger for conducting fire management. In case of fire, we can use foam, dry powder, water mist, 1211 and carbon dioxide for fire extinguishing agents.

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Structure Chemical Name CAS MF
4-BROMO-2-IODOPYRIDINE 4-BROMO-2-IODOPYRIDINE 100523-83-9 C5H3BrIN
(3,5-DICHLOROPYRIDIN-2-YL)METHANOL (3,5-DICHLOROPYRIDIN-2-YL)METHANOL 275383-87-4 C6H5Cl2NO
(2-Trifluoromethyl-pyridin-3-yl)-methanol (2-Trifluoromethyl-pyridin-3-yl)-methanol 131747-57-4 C7H6F3NO
2-(4,6-DIMETHYL-PYRIMIDIN-2-YLSULFANYL)-BUTYRIC ACID 2-(4,6-DIMETHYL-PYRIMIDIN-2-YLSULFANYL)-BUTYRIC ACID 433242-64-9 C10H14N2O2S
5,6-Difluoropyridine-2-carboxylic acid 5,6-Difluoropyridine-2-carboxylic acid 851386-38-4 C6H3F2NO2
6-CHLORO-IMIDAZO[1,2-B]PYRIDAZIN-3-AMINE 6-CHLORO-IMIDAZO[1,2-B]PYRIDAZIN-3-AMINE 166176-45-0 C6H5ClN4
4,6-DIIODO-2-METHYLPYRIMIDINE 4,6-DIIODO-2-METHYLPYRIMIDINE 66298-49-5 C5H4I2N2
5-BROMO-3-METHOXYPYRIDIN-2-AMINE 5-BROMO-3-METHOXYPYRIDIN-2-AMINE 42409-58-5 C6H7BrN2O
6-(benzyloxy)pyridine-2-carboxylic acid 6-(benzyloxy)pyridine-2-carboxylic acid 149744-21-8 C13H11NO3
2-Methylamino-3-amino-6-methoxypyridine 2-Methylamino-3-amino-6-methoxypyridine 90817-34-8 C7H11N3O
ETHYL2-METHYLTHIO-4-PYRIMIDIN-ACETATE ETHYL2-METHYLTHIO-4-PYRIMIDIN-ACETATE 582309-12-4 C9H12N2O2S
2,3-Diamino-5-methylpyridine 2,3-Diamino-5-methylpyridine 24638-29-7 C6H9N3
4-CYANO-PYRIDINE-2-METHANOL 4-CYANO-PYRIDINE-2-METHANOL 51454-63-8 C7H6N2O
3-Chloro-2-methoxypyridin-4-ylboronic acid 3-Chloro-2-methoxypyridin-4-ylboronic acid 957060-88-7 C6H7BClNO3
6,7-Dichloroquinoline 6,7-Dichloroquinoline 40635-11-8 C9H5Cl2N
ethyl 4-chloro-2-pyridin-3-ylpyrimidine-5-carboxylate ethyl 4-chloro-2-pyridin-3-ylpyrimidine-5-carboxylate 34775-04-7 C12H10ClN3O2
2-AMINO-5,6-DIHYDRO-4H-CYCLOPENTA[B]THIOPHENE-3-CARBOXAMIDE 2-AMINO-5,6-DIHYDRO-4H-CYCLOPENTA[B]THIOPHENE-3-CARBOXAMIDE 77651-38-8 C8H10N2OS
3-(4-AMINOPYRIDIN-3-YL)ACRYLIC ACID 3-(4-AMINOPYRIDIN-3-YL)ACRYLIC ACID 773131-96-7 C8H8N2O2
4-(6-Chloro-pyrazin-2-yl)-2-methyl-benzoicacid 4-(6-Chloro-pyrazin-2-yl)-2-methyl-benzoicacid 1020718-74-4 C12H9ClN2O2
2-AMINO-5,6-DIHYDRO-4H-CYCLOPENTA[B]THIOPHENE-3-CARBOXYLIC ACID ETHYL ESTER 2-AMINO-5,6-DIHYDRO-4H-CYCLOPENTA[B]THIOPHENE-3-CARBOXYLIC ACID ETHYL ESTER 4815-29-6 C10H13NO2S
2-Hydroxy-3-Amino-5-Bromopyridine 2-Hydroxy-3-Amino-5-Bromopyridine 98786-86-3 C5H5BrN2O
2-Methoxy-3-Nitro-5-Picoline 2-Methoxy-3-Nitro-5-Picoline 33252-62-9 C7H8N2O3
2-Methoxy-5-Iodopyridine 2-Methoxy-5-Iodopyridine 13472-61-2 C6H6INO
Furo[2,3-c]pyridine-5-methanol (9CI) Furo[2,3-c]pyridine-5-methanol (9CI) 478148-60-6 C8H7NO2
Pyridine, 3-(3-pyrrolidinyl)-, (+)- (9CI) Pyridine, 3-(3-pyrrolidinyl)-, (+)- (9CI) 498548-11-1 C9H12N2
Pyrimidine, 4-bromo-2-chloro- (9CI) Pyrimidine, 4-bromo-2-chloro- (9CI) 885702-34-1 C4H2BrClN2
Isoxazolo[4,5-b]pyridin-3-amine (9CI) Isoxazolo[4,5-b]pyridin-3-amine (9CI) 114080-93-2 C6H5N3O
Pyrimido[4,5-d]pyrimidin-4-amine (9CI) Pyrimido[4,5-d]pyrimidin-4-amine (9CI) 26979-05-5 C6H5N5
Pyrimidine, 4-amino-6-fluoro-5-methyl- (8CI) Pyrimidine, 4-amino-6-fluoro-5-methyl- (8CI) 18260-69-0 C5H6FN3
2,5-PYRAZINEDICARBOXYLIC ACID DIHYDRATE 2,5-PYRAZINEDICARBOXYLIC ACID DIHYDRATE 205692-63-3 C6H8N2O6
2-BROMO-4-METHYL-5-AMINOPYRIDINE 2-BROMO-4-METHYL-5-AMINOPYRIDINE C6H7BrN2
2,3-DICHLORO-6-PICOLINE 2,3-DICHLORO-6-PICOLINE 54957-86-7 C6H5Cl2N
2-Pyridineacetic acid, 5-methyl- (9CI) 2-Pyridineacetic acid, 5-methyl- (9CI) 848093-05-0 C8H9NO2
7-Isoquinolinecarboxaldehyde (6CI,9CI) 7-Isoquinolinecarboxaldehyde (6CI,9CI) 87087-20-5 C10H7NO
2-CHLORO-5-FLUORO-3-NITRO-4-PICOLINE 2-CHLORO-5-FLUORO-3-NITRO-4-PICOLINE 1003711-51-0 C6H4ClFN2O2
(6-ethylpyridin-2-yl)methanol (6-ethylpyridin-2-yl)methanol 163658-33-1 C8H11NO
2-CHLORO-3-(HYDROXYMETHYL)-4-IODOPYRIDINE 2-CHLORO-3-(HYDROXYMETHYL)-4-IODOPYRIDINE C6H5ClINO
2-Acetamidopyridine-5-boronic acid 2-Acetamidopyridine-5-boronic acid 947533-21-3 C7H9BN2O3
2-Bromo-4-pyridinethylamine 2-Bromo-4-pyridinethylamine 858362-82-0 C6H7BrN2
1,1'-DIETHYL-4,4'-BIPYRIDINIUM DIBROMIDE 1,1'-DIETHYL-4,4'-BIPYRIDINIUM DIBROMIDE 53721-12-3 C14H18Br2N2
2-(4-chlorophenyl)pyridine 2-(4-chlorophenyl)pyridine 5969-83-5 C11H8ClN
METHYL 6-(1-PYRROLIDINYL)NICOTINATE METHYL 6-(1-PYRROLIDINYL)NICOTINATE 210963-94-3 C11H14N2O2
3-BROMO-5-(4-FLUOROPHENYL)PYRIDINE 3-BROMO-5-(4-FLUOROPHENYL)PYRIDINE 675590-04-2 C11H7BrFN
N-(tert-Butyl)-3,6,7-trichloroquinoxalin-2-amine N-(tert-Butyl)-3,6,7-trichloroquinoxalin-2-amine 281211-09-4 C12H12Cl3N3
2-Chloro-4-(3-methoxyphenyl)pyrimidine 2-Chloro-4-(3-methoxyphenyl)pyrimidine 499195-50-5 C11H9ClN2O
1H-Pyrrolo[2,3-c]pyridine,2,3-dihydro-5-methoxy-(9CI) 1H-Pyrrolo[2,3-c]pyridine,2,3-dihydro-5-methoxy-(9CI) 412030-10-5 C8H10N2O
2-Pyridinemethanol,5-chloro-(9CI) 2-Pyridinemethanol,5-chloro-(9CI) 209526-98-7 C6H6ClNO
1H-Pyrrolo[3,2-b]pyridine-5-carbonitrile 1H-Pyrrolo[3,2-b]pyridine-5-carbonitrile 146767-63-7 C8H5N3
PYRIDINE-3,4,5-TRIAMINE PYRIDINE-3,4,5-TRIAMINE 618439-82-0 C5H8N4
5-FLUOROURACIL-15N2 5-FLUOROURACIL-15N2 68941-95-7 C4H3FN2O2
6-Chloro-4-pyrimidinecarboxylic acid 6-Chloro-4-pyrimidinecarboxylic acid 37131-91-2 C5H3ClN2O2
4,6-DIIODOPYRIMIDINE 4,6-DIIODOPYRIMIDINE 19646-06-1 C4H2I2N2
5-BROMO-2-METHYL-4(1H)-PYRIMIDINONE 5-BROMO-2-METHYL-4(1H)-PYRIMIDINONE 1676-57-9 C5H5BrN2O
5-BROMO-PYRAZOLO[1,5-A]PYRIDINE-3-CARBOXYLIC ACID ETHYL ESTER 5-BROMO-PYRAZOLO[1,5-A]PYRIDINE-3-CARBOXYLIC ACID ETHYL ESTER 885276-93-7 C10H9BrN2O2
2-METHYL-5-(PROPYLSULFONYL)PYRIMIDIN-4-AMINE 2-METHYL-5-(PROPYLSULFONYL)PYRIMIDIN-4-AMINE 175202-09-2 C8H13N3O2S
2-AMINO-6-METHYLPYRIDINE-3,5-DICARBONITRILE 2-AMINO-6-METHYLPYRIDINE-3,5-DICARBONITRILE 78473-11-7 C8H6N4
6-CYANO-IMIDAZO[1,2-A]PYRIDINE-2-CARBOXYLIC ACID ETHYL ESTER 6-CYANO-IMIDAZO[1,2-A]PYRIDINE-2-CARBOXYLIC ACID ETHYL ESTER 214958-33-5 C11H9N3O2
3-(PYRIMIDIN-2-YLTHIO)PENTANE-2,4-DIONE 3-(PYRIMIDIN-2-YLTHIO)PENTANE-2,4-DIONE 175277-25-5 C9H10N2O2S
2-BENZYL-OCTAHYDRO-PYRROLO[3,4-C]PYRIDINE 2-BENZYL-OCTAHYDRO-PYRROLO[3,4-C]PYRIDINE 351370-98-4 C14H20N2
5-FLUOROURACIL, [2-14C] 5-FLUOROURACIL, [2-14C] 766-63-2 C4H3FN2O2
5-PYRIDIN-2-YLTHIOPHENE-2-CARBALDEHYDE 5-PYRIDIN-2-YLTHIOPHENE-2-CARBALDEHYDE 132706-12-8 C10H7NOS
6,6'-DITHIODINICOTINIC ACID 6,6'-DITHIODINICOTINIC ACID 15658-35-2 C12H8N2O4S2
4,6-DIHYDROXY-2-METHYL-PYRIMIDINE-5-CARBALDEHYDE 4,6-DIHYDROXY-2-METHYL-PYRIMIDINE-5-CARBALDEHYDE C6H6N2O3
4-ETHYL-2-METHYLPYRIDINE 4-ETHYL-2-METHYLPYRIDINE 536-88-9 C8H11N
IMIDAZO[1,2-A]PYRIDINE-6-CARBONITRILE IMIDAZO[1,2-A]PYRIDINE-6-CARBONITRILE 106850-34-4 C8H5N3
1-(2-CHLORO-3-PYRIDYL)-2,5-DIHYDRO-1H-PYRROLE-2,5-DIONE 1-(2-CHLORO-3-PYRIDYL)-2,5-DIHYDRO-1H-PYRROLE-2,5-DIONE 278610-39-2 C9H5ClN2O2
(4-METHYL-2-PHENYL-5-PYRIMIDINYL)METHANOL (4-METHYL-2-PHENYL-5-PYRIMIDINYL)METHANOL 342405-27-0 C12H12N2O
5-BROMO-2-(PYRROLIDIN-1-YL)PYRIMIDINE 5-BROMO-2-(PYRROLIDIN-1-YL)PYRIMIDINE 446286-61-9 C8H10BrN3
2-CHLOROPYRIDO[2,3-D]PYRIMIDINE-4(1H)-THIONE 2-CHLOROPYRIDO[2,3-D]PYRIMIDINE-4(1H)-THIONE 91996-76-8 C7H4ClN3S
2-FLUORO-3-METHYL-PYRIDINE-5-CARBOXYLIC ACID 2-FLUORO-3-METHYL-PYRIDINE-5-CARBOXYLIC ACID 885267-35-6 C7H6FNO2
3,5-BIS(TRIFLUOROMETHYL)PYRIDINE 3,5-BIS(TRIFLUOROMETHYL)PYRIDINE 20857-47-0 C7H3F6N
5-(TERT-BUTYLSULFONYL)-2-MORPHOLINOPYRIMIDIN-4-AMINE 5-(TERT-BUTYLSULFONYL)-2-MORPHOLINOPYRIMIDIN-4-AMINE 175202-11-6 C12H20N4O3S
(4-CYCLOPROPYL-6-TRIFLUOROMETHYL-PYRIMIDIN-2-YL)-HYDRAZINE (4-CYCLOPROPYL-6-TRIFLUOROMETHYL-PYRIMIDIN-2-YL)-HYDRAZINE 869945-40-4 C8H9F3N4
2-ETHOXY-5-(TRIBUTYLSTANNYL)PYRIMIDINE 2-ETHOXY-5-(TRIBUTYLSTANNYL)PYRIMIDINE 1025746-10-4 C18H34N2OSn
2-CHLORO-N4-METHYLPYRIDINE-3,4-DIAMINE 2-CHLORO-N4-METHYLPYRIDINE-3,4-DIAMINE 50432-67-2 C6H8ClN3
6-CHLORO-IMIDAZO[1,2-A]PYRIDINE-8-CARBOXYLIC ACID 6-CHLORO-IMIDAZO[1,2-A]PYRIDINE-8-CARBOXYLIC ACID 155735-02-7 C8H5ClN2O2
ASISCHEM A03574 ASISCHEM A03574 110099-94-0 C6H6N2O2S
2,5-DICHLORO-3-IODOPYRIDINE 2,5-DICHLORO-3-IODOPYRIDINE 942206-23-7 C5H2Cl2IN
5-BROMO-2-PYRAZOL-1-YL-PYRIMIDINE 5-BROMO-2-PYRAZOL-1-YL-PYRIMIDINE 883230-94-2 C7H5BrN4
TIMTEC-BB SBB010636 TIMTEC-BB SBB010636 115122-63-9 C9H9NO3
3-IODOPYRIDINE-4-CARBONITRILE 3-IODOPYRIDINE-4-CARBONITRILE 10386-28-4 C6H3IN2
1,2,3,4-TETRAHYDRO-[2,7]NAPHTHYRIDINE 1,2,3,4-TETRAHYDRO-[2,7]NAPHTHYRIDINE 108749-08-2 C8H10N2
6-HYDROXYNICOTINIC ACID ETHYL ESTER 6-HYDROXYNICOTINIC ACID ETHYL ESTER 18617-50-0 C8H9NO3
2-(BENZYLOXY)-3-BROMOPYRIDINE 2-(BENZYLOXY)-3-BROMOPYRIDINE 52200-49-4 C12H10BrNO
3-Amino-2-[4-butoxycarbonyl(piperazino)]pyridine 3-Amino-2-[4-butoxycarbonyl(piperazino)]pyridine 111669-25-1 C14H22N4O2
4-Chloro-6-(phenylmethoxy)-2-pyrimidinamine 4-Chloro-6-(phenylmethoxy)-2-pyrimidinamine 210992-85-1 C11H10ClN3O
2-a)pyrimidin-4-one,2-chloro-4h-pyrido( 2-a)pyrimidin-4-one,2-chloro-4h-pyrido( 5418-94-0 C8H5ClN2O
3,6-dichloropyridazin-4-ol 3,6-dichloropyridazin-4-ol 2779-81-9 C4H2Cl2N2O
disodium 4-[[5-(aminocarbonyl)-1-ethyl-1,6-dihydro-2-hydroxy-4-methyl-6-oxo-3-pyridyl]azo]-6-[(4,6-dichloro-1,3,5-triazin-2-yl)amino]benzene-1,3-disulphonate disodium 4-[[5-(aminocarbonyl)-1-ethyl-1,6-dihydro-2-hydroxy-4-methyl-6-oxo-3-pyridyl]azo]-6-[(4,6-dichloro-1,3,5-triazin-2-yl)amino]benzene-1,3-disulphonate 70865-29-1 C18H17Cl2N8NaO9S2
(4-Chloro-3-pyridinyl)methanol (4-Chloro-3-pyridinyl)methanol 189449-41-0 C6H6ClNO
Ethyl Tetrahydropyran-4-Carboxylate Ethyl Tetrahydropyran-4-Carboxylate 96835-17-5 C8H14O3
5-(Hydroxymethyl)-2-phenylpyrimidine 5-(Hydroxymethyl)-2-phenylpyrimidine 886531-62-0 C11H10N2O
2-methoxy-5-nitropyrimidine 2-methoxy-5-nitropyrimidine 14001-69-5 C5H5N3O3
5-chloro-2-methoxy-pyrimidine 5-chloro-2-methoxy-pyrimidine 38373-44-3 C5H5ClN2O
Pyridine,3,5-difluoro-,1-oxide(9CI) Pyridine,3,5-difluoro-,1-oxide(9CI) 210169-07-6 C5H3F2NO
2-CHLORO-5-FLUORO-4-(HYDROXYMETHYL)PYRIDINE 2-CHLORO-5-FLUORO-4-(HYDROXYMETHYL)PYRIDINE 884494-86-4 C6H5ClFNO
4-(4-CHLOROPHENYL)THIOPHENE-2-CARBOXYLIC ACID 4-(4-CHLOROPHENYL)THIOPHENE-2-CARBOXYLIC ACID C11H7ClO2S
PIPERAZINE DL-MALATE PIPERAZINE DL-MALATE 14852-14-3 C8H16N2O5
E 7010 E 7010 141430-65-1 C18H17N3O4S
2,6-dihydroxy-3-cyanopyridine 2,6-dihydroxy-3-cyanopyridine 35441-10-2 C6H4N2O2
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