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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
6-chloro-7H-pyrrolo[2,3-d]pyrimidine 6-chloro-7H-pyrrolo[2,3-d]pyrimidine 90994-17-5 C6H4ClN3
2-BROMO-5-(TERT-BUTOXYCARBONYLAMINO)PYRIDINE 2-BROMO-5-(TERT-BUTOXYCARBONYLAMINO)PYRIDINE 218594-15-1 C10H13BrN2O2
4,6-dichloro-7H-pyrrolo[2,3-d]pyrimidine 4,6-dichloro-7H-pyrrolo[2,3-d]pyrimidine 97337-32-1 C6H3Cl2N3
2-(4-CHLOROPHENOXY)-5-NITROPYRIDINE 2-(4-CHLOROPHENOXY)-5-NITROPYRIDINE 28232-30-6 C11H7ClN2O3
3-AMINO-2,4-DIBROMO-5-FLUOROPYRIDINE 3-AMINO-2,4-DIBROMO-5-FLUOROPYRIDINE 884494-90-0 C5H3Br2FN2
2-BROMO-6-(1H-PYRAZOL-1-YL)PYRIDINE 2-BROMO-6-(1H-PYRAZOL-1-YL)PYRIDINE 123640-41-5 C8H6BrN3
2,3,4,5-Tetrachloro-6-(trichloromethyl)pyridine 2,3,4,5-Tetrachloro-6-(trichloromethyl)pyridine 1134-04-9 C6Cl7N
C-(4-Trifluoromethyl-pyridin-2-yl)-methylamine C-(4-Trifluoromethyl-pyridin-2-yl)-methylamine 872577-05-4 C7H7F3N2
4-Pyridylamidoxime 4-Pyridylamidoxime 1594-57-6 C6H7N3O
4-methoxymethylpyridoxine 4-methoxymethylpyridoxine 1464-33-1 C9H13NO3
2-Pyrimidinecarboxylicacid,4-amino-,methylester(9CI) 2-Pyrimidinecarboxylicacid,4-amino-,methylester(9CI) 71470-40-1 C6H7N3O2
2-Pyridinemethanamine,6-fluoro-(9CI) 2-Pyridinemethanamine,6-fluoro-(9CI) 205744-18-9 C6H7FN2
4H-Pyrano[3,2-b]pyridin-4-one,2,3-dihydro-(9CI) 4H-Pyrano[3,2-b]pyridin-4-one,2,3-dihydro-(9CI) 405174-48-3 C8H7NO2
6-Methyl-3-pyridineethanol 6-Methyl-3-pyridineethanol 100189-17-1 C8H11NO
2-Pyridinecarboxylicacid,1,6-dihydro-3-methyl-6-oxo-(9CI) 2-Pyridinecarboxylicacid,1,6-dihydro-3-methyl-6-oxo-(9CI) 115185-81-4 C7H7NO3
4-Bromopyridine N-Oxide 4-Bromopyridine N-Oxide 14248-50-1 C5H4BrNO
4-HYDROXY-2-METHYL-PYRIMIDINE-5-CARBOXYLIC ACID ETHYL ESTER 4-HYDROXY-2-METHYL-PYRIMIDINE-5-CARBOXYLIC ACID ETHYL ESTER 67383-32-8 C8H10N2O3
3-PICOLINE-4-BORONIC ACID 3-PICOLINE-4-BORONIC ACID C6H8BNO2
2-BROMO-5-CHLOROPYRIDINE-4-BORONIC ACID 2-BROMO-5-CHLOROPYRIDINE-4-BORONIC ACID 1072952-51-2 C5H4BBrClNO2
3-CHLORO-4-FLUOROPYRIDINE 3-CHLORO-4-FLUOROPYRIDINE C5H3ClFN
2-PHENYL-QUINOLINE-4-CARBOXYLIC ACID METHYL ESTER 2-PHENYL-QUINOLINE-4-CARBOXYLIC ACID METHYL ESTER 4546-48-9 C17H13NO2
6-HYDROXYFLAVANONE 6-HYDROXYFLAVANONE 4250-77-5 C15H12O3
5,7-Dihydroxy-4-methylcoumarin 5,7-Dihydroxy-4-methylcoumarin 2107-76-8 C10H8O4
2-MERCAPTO-5-METHYLPYRIDINE 2-MERCAPTO-5-METHYLPYRIDINE 18368-58-6 C6H7NS
METHYL PIPERAZINE-1-CARBOXYLATE METHYL PIPERAZINE-1-CARBOXYLATE 50606-31-0 C6H12N2O2
PYRIDIN-2-YLMETHYL-HYDRAZINE PYRIDIN-2-YLMETHYL-HYDRAZINE 7112-37-0 C6H9N3
ETHYL VIOLOGEN DIPERCHLORATE ETHYL VIOLOGEN DIPERCHLORATE 36305-51-8 C14H18Cl2N2O8
ISOQUINOLINE-1-CARBALDEHYDE ISOQUINOLINE-1-CARBALDEHYDE 4494-18-2 C10H7NO
3,4,5,6,7,8-HEXAHYDRO-2(1H)-QUINOLINONE 3,4,5,6,7,8-HEXAHYDRO-2(1H)-QUINOLINONE 10333-11-6 C9H13NO
4-[2-(5-Ethyl-2-pyridinyl)ethoxy]benzyaldehyde 4-[2-(5-Ethyl-2-pyridinyl)ethoxy]benzyaldehyde 114393-97-4 C16H17NO2
(6-Bromo-pyridin-2-yl)-methyl-amine (6-Bromo-pyridin-2-yl)-methyl-amine 89026-79-9 C6H7BrN2
Indolo[3,2-b]carbazole Indolo[3,2-b]carbazole 6336-32-9 C18H12N2
(2,6-DIMETHYLPYRIDIN-4-YL)METHANOL (2,6-DIMETHYLPYRIDIN-4-YL)METHANOL 18088-01-2 C8H11NO
Methyl 2-amino-4-methylpyridine-3-carboxylate Methyl 2-amino-4-methylpyridine-3-carboxylate 76336-16-8 C8H10N2O2
2-Amino-5-bromo-4-methoxy-3-pyridinecarbonitrile 2-Amino-5-bromo-4-methoxy-3-pyridinecarbonitrile 951884-75-6 C7H6BrN3O
Ethyl 6,8-difluoro-4-hydroxyquinoline-3-carboxylate Ethyl 6,8-difluoro-4-hydroxyquinoline-3-carboxylate 107555-38-4 C12H9F2NO3
3-Bromo-2-fluoro-4-picoline 3-Bromo-2-fluoro-4-picoline 884495-46-9 C6H5BrFN
2-Amino-3-fluoro-5-(trifluoromethyl)pyridine 2-Amino-3-fluoro-5-(trifluoromethyl)pyridine 852062-17-0 C6H4F4N2
5-Methylpyridine-2,3-dicarboxylic acid 5-Methylpyridine-2,3-dicarboxylic acid 53636-65-0 C8H7NO4
4-BROMO-2,6-DIMETHYLPYRIMIDINE 4-BROMO-2,6-DIMETHYLPYRIMIDINE 354574-56-4 C6H7BrN2
2-Amino-3-nitro-5-trifluoromethylpyridine 2-Amino-3-nitro-5-trifluoromethylpyridine 53359-69-6 C6H4F3N3O2
3-Iodo-4-(trifluoromethyl)-pyridine 3-Iodo-4-(trifluoromethyl)-pyridine 625115-02-8 C6H3F3IN
2-BROMO-3-FLUORO-5-METHYLPYRIDINE 2-BROMO-3-FLUORO-5-METHYLPYRIDINE 34552-16-4 C6H5BrFN
2-Amino-5-bromo-3-benzloxypyridine 2-Amino-5-bromo-3-benzloxypyridine 754230-78-9 C12H11BrN2O
3-AMINO-2-(2,4-DIFLUOROPHENOXY)PYRIDINE 3-AMINO-2-(2,4-DIFLUOROPHENOXY)PYRIDINE 175135-63-4 C11H8F2N2O
2-Chloro-4,6-diphenylpyrimidine 2-Chloro-4,6-diphenylpyrimidine 2915-16-4 C16H11ClN2
N-Phenyl-2-pyrimidinamine N-Phenyl-2-pyrimidinamine 57356-49-7 C10H9N3
6-CHLORO-3H-PYRIDO[3,4-D]PYRIMIDIN-4-ONE 6-CHLORO-3H-PYRIDO[3,4-D]PYRIMIDIN-4-ONE 171178-47-5 C7H4ClN3O
1-Benzyl-1,2,3,6-tetrahydropyridine-4-carboxylic acid 1-Benzyl-1,2,3,6-tetrahydropyridine-4-carboxylic acid 79858-48-3 C13H15NO2
2-BENZYLOXY-5-BROMO-6-METHYLPYRIDINE 2-BENZYLOXY-5-BROMO-6-METHYLPYRIDINE 126717-60-0 C13H12BrNO
3-AMINOETHYLTHIOPHENE HCL 3-AMINOETHYLTHIOPHENE HCL 34843-84-0 C6H10ClNS
ethyl 4-cyano-2-pyridinecarboxylate ethyl 4-cyano-2-pyridinecarboxylate 97316-50-2 C9H8N2O2
2,6-BIS[1-(2,6-DI-I-PROPYLPHENYLIMINO)ETHYL]PYRIDINE 2,6-BIS[1-(2,6-DI-I-PROPYLPHENYLIMINO)ETHYL]PYRIDINE 204203-14-5 C33H43N3
6-Chloro-3-fluoro-pyridine-2-carboxylic acid 6-Chloro-3-fluoro-pyridine-2-carboxylic acid 884494-76-2 C6H3ClFNO2
PYRAZOLO[1,5-A]PYRIDINE-7-CARBALDEHYDE PYRAZOLO[1,5-A]PYRIDINE-7-CARBALDEHYDE 362661-83-4 C8H6N2O
DIETHYL 2-([(2-CHLORO-3-PYRIDYL)CARBONYL]AMINO)MALONATE DIETHYL 2-([(2-CHLORO-3-PYRIDYL)CARBONYL]AMINO)MALONATE 219793-85-8 C13H15ClN2O5
2-PICOLINE-5-BORONIC ACID HYDRATE 2-PICOLINE-5-BORONIC ACID HYDRATE 1072952-30-7 C6H10BNO3
3-AMINO-6-METHYLPYRIDIN-2-OL 3-AMINO-6-METHYLPYRIDIN-2-OL 52334-79-9 C6H8N2O
4-(4-PYRIDINYL)-2-PYRIMIDINAMINE 4-(4-PYRIDINYL)-2-PYRIMIDINAMINE 66521-70-8 C9H8N4
1-(CYCLOPROPYLMETHYL)PIPERAZINE 1-(CYCLOPROPYLMETHYL)PIPERAZINE 57184-25-5 C8H16N2
2-[2-(DIPHENYLPHOSPHINO)ETHYL]PYRIDINE 2-[2-(DIPHENYLPHOSPHINO)ETHYL]PYRIDINE 10150-27-3 C19H18NP
3-(BROMOMETHYL)PYRIDAZINE, 3-(BROMOMETHYL)PYRIDAZINE, 60023-36-1 C5H5BrN2
5-BROMO-2-CHLOROPYRIDIN-3-AMINE 5-BROMO-2-CHLOROPYRIDIN-3-AMINE C5H4BrClN2
4-BROMO-6-(TRIFLUOROMETHYL)PYRIMIDINE 4-BROMO-6-(TRIFLUOROMETHYL)PYRIMIDINE 785777-89-1 C5H2BrF3N2
5-TRIFLUOROMETHYL-2-PYRIDINESULFONYL CHLORIDE 5-TRIFLUOROMETHYL-2-PYRIDINESULFONYL CHLORIDE 174485-72-4 C6H3ClF3NO2S
2-PROPYL-PYRIMIDINE-5-CARBALDEHYDE 2-PROPYL-PYRIMIDINE-5-CARBALDEHYDE 876890-38-9 C8H10N2O
2-PHENYLNICOTINIC ACID 2-PHENYLNICOTINIC ACID 33421-39-5 C12H9NO2
(4-CHLOROPYRIDIN-2-YL)METHANAMINE DIHYDROCHLORIDE (4-CHLOROPYRIDIN-2-YL)METHANAMINE DIHYDROCHLORIDE 114780-09-5 C6H8Cl2N2
5-BROMO-2-ETHOXY-PYRIMIDINE 5-BROMO-2-ETHOXY-PYRIMIDINE 17758-11-1 C6H7BrN2O
7-IODO[1,2,4]TRIAZOLO[1,5-A]PYRIDINE 7-IODO[1,2,4]TRIAZOLO[1,5-A]PYRIDINE 690258-25-4 C6H4IN3
2-(DIMETHYLAMINO)NICOTINONITRILE 2-(DIMETHYLAMINO)NICOTINONITRILE 60138-76-3 C8H9N3
3,5-DICHLORO-4-NITROPYRIDINE 3,5-DICHLORO-4-NITROPYRIDINE 433294-98-5 C5H2Cl2N2O2
2-Bromo-5-Fluoro-3-Methylpyridine 2-Bromo-5-Fluoro-3-Methylpyridine C6H5BrFN
3,6-Di(1H-imidazol-1-yl)pyridazine 3,6-Di(1H-imidazol-1-yl)pyridazine 177648-99-6 C10H8N6
3-Amino-2,6-dibromo-5-ethoxypyridine 3-Amino-2,6-dibromo-5-ethoxypyridine 1000018-10-9 C7H8Br2N2O
3-Chloro-2-iodo-5-(trifluoromethyl)pyridine 3-Chloro-2-iodo-5-(trifluoromethyl)pyridine 134161-12-9 C6H2ClF3IN
Ethyl 4,6-dimethoxypyrimidine-2-carboxylate Ethyl 4,6-dimethoxypyrimidine-2-carboxylate 128276-49-3 C9H12N2O4
2,3,4,5-Tetrafluoropyridine 2,3,4,5-Tetrafluoropyridine 3512-16-1 C5HF4N
4-(6-Bromo-pyridin-2-yl)-2-methyl-benzoicacid 4-(6-Bromo-pyridin-2-yl)-2-methyl-benzoicacid 1020718-62-0 C13H10BrNO2
3-AMINOIMIDAZO(1,2-A)PYRIDINE 3-AMINOIMIDAZO(1,2-A)PYRIDINE 28036-33-1 C7H7N3
2,6-DICHLORO-4-NITROPYRIDINE-N-OXIDE 2,6-DICHLORO-4-NITROPYRIDINE-N-OXIDE 2587-01-1 C5H2Cl2N2O3
3-BROMO-5-(CHLOROMETHYL)PYRIDINE HYDROCHLORIDE 3-BROMO-5-(CHLOROMETHYL)PYRIDINE HYDROCHLORIDE 39741-46-3 C6H5BrClN.ClH
6-FLUORO-3,4-PYRIDINEDIAMINE 6-FLUORO-3,4-PYRIDINEDIAMINE 212268-13-8 C5H6FN3
4-METHOXY-2-METHYL-5-PYRIMIDINAMINE 4-METHOXY-2-METHYL-5-PYRIMIDINAMINE 53135-45-8 C6H9N3O
6-Chloro-5-Nitropyrimidine-2,4-Diol 6-Chloro-5-Nitropyrimidine-2,4-Diol 6630-30-4 C4H2ClN3O4
3-Methoxy-6-Amino-2-Picoline 3-Methoxy-6-Amino-2-Picoline 52334-83-5 C7H10N2O
Ethyl (2-amino-4-hydroxy-6-methyl-5-pyrimidinyl)acetate Ethyl (2-amino-4-hydroxy-6-methyl-5-pyrimidinyl)acetate 499209-19-7 C9H13N3O3
Pyrimidine, 4-fluoro- (8CI,9CI) Pyrimidine, 4-fluoro- (8CI,9CI) 31462-55-2 C4H3FN2
Carbamic acid, (2,6-dichloro-4-pyridinyl)-, 1,1-dimethylethyl ester (9CI) Carbamic acid, (2,6-dichloro-4-pyridinyl)-, 1,1-dimethylethyl ester (9CI) 501907-61-5 C10H12Cl2N2O2
Pyridine, 5-(chloromethyl)-2-(trifluoromethyl)- (9CI) Pyridine, 5-(chloromethyl)-2-(trifluoromethyl)- (9CI) 386715-33-9 C7H5ClF3N
4-Amino-6-chloro-2-diethylaminopyrimidine 4-Amino-6-chloro-2-diethylaminopyrimidine 3289-38-1 C8H13ClN4
(6-Chloro-pyrimidin-4-yl)-dimethyl-amine (6-Chloro-pyrimidin-4-yl)-dimethyl-amine 31058-83-0 C6H8ClN3
ethyl 2-phenylpyrimidine-5-carboxylate ethyl 2-phenylpyrimidine-5-carboxylate 85386-14-7 C13H12N2O2
4-Pyrimidinecarbonitrile, 2-amino- (9CI) 4-Pyrimidinecarbonitrile, 2-amino- (9CI) 36314-98-4 C5H4N4
5-Pyrimidinecarboxaldehyde, 4-amino-2-methyl- (6CI,7CI,8CI,9CI) 5-Pyrimidinecarboxaldehyde, 4-amino-2-methyl- (6CI,7CI,8CI,9CI) 73-68-7 C6H7N3O
2-CYANO-3-PYRIDINECARBOXYLIC ACID METHYL ESTER 2-CYANO-3-PYRIDINECARBOXYLIC ACID METHYL ESTER 75358-89-3 C8H6N2O2
2H-Pyrano[3,2-b]pyridin-4-ol, 3,4-dihydro- (9CI) 2H-Pyrano[3,2-b]pyridin-4-ol, 3,4-dihydro- (9CI) 754149-09-2 C8H9NO2
1H-Pyrrolo[2,3-b]pyridine-2-carboxaldehyde (9CI) 1H-Pyrrolo[2,3-b]pyridine-2-carboxaldehyde (9CI) 394223-03-1 C8H6N2O
6-Fluoro-4-methyl-pyridin-3-ylamine 6-Fluoro-4-methyl-pyridin-3-ylamine 954236-33-0 C6H7FN2
ethyl2-methylquinoline-6-carboxylate ethyl2-methylquinoline-6-carboxylate 855763-77-8 C13H13NO2
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