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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
2-HYDROXY-5-NITRO-3-(TRIFLUOROMETHYL)PYRIDINE 2-HYDROXY-5-NITRO-3-(TRIFLUOROMETHYL)PYRIDINE 99368-66-8 C6H3F3N2O3
Methyl 3-amino-6-bromopyrazine-2-carboxylate Methyl 3-amino-6-bromopyrazine-2-carboxylate 6966-01-4 C6H6BrN3O2
4-Chloro-3-methylpyridine hydrochloride 4-Chloro-3-methylpyridine hydrochloride 19524-08-4 C6H7Cl2N
2-Cyano-5-hydroxypyridine 2-Cyano-5-hydroxypyridine 86869-14-9 C6H4N2O
5-BROMO-2,4-DIMETHOXYPYRIMIDINE 5-BROMO-2,4-DIMETHOXYPYRIMIDINE 56686-16-9 C6H7BrN2O2
Pyridinium tribromide Pyridinium tribromide 39416-48-3 C5H6Br3N-2
Ethyl 2-chloropyrimidine-5-carboxylate Ethyl 2-chloropyrimidine-5-carboxylate 89793-12-4 C7H7ClN2O2
METHYL-(TETRAHYDRO-PYRAN-4-YL)-AMINE HCL METHYL-(TETRAHYDRO-PYRAN-4-YL)-AMINE HCL 220641-87-2 C6H13NO
3-FLUORO-4-(4,4,5,5-TETRAMETHYL-[1,3,2]DIOXABOROLAN-2-YL)PYRIDINE 3-FLUORO-4-(4,4,5,5-TETRAMETHYL-[1,3,2]DIOXABOROLAN-2-YL)PYRIDINE 458532-88-2 C11H15BFNO2
2,5-Dibromo-3-nitropyridine 2,5-Dibromo-3-nitropyridine 15862-37-0 C5H2Br2N2O2
Methyl 4,6-dichloronicotinate Methyl 4,6-dichloronicotinate 65973-52-6 C7H5Cl2NO2
Thieno[2,3-d]pyrimidin-4(3H)one Thieno[2,3-d]pyrimidin-4(3H)one 14080-50-3 C6H4N2OS
3-Chloro-6-trifluoromethyl-pyridazine 3-Chloro-6-trifluoromethyl-pyridazine 258506-68-2 C5H2ClF3N2
6-QUINOLINEACETIC ACID 6-QUINOLINEACETIC ACID 5622-34-4 C11H9NO2
4-Bromo-2-pyridinemethanol 4-Bromo-2-pyridinemethanol 131747-45-0 C6H6BrNO
Pyridazine, 4-bromo- (9CI) Pyridazine, 4-bromo- (9CI) 115514-66-4 C4H3BrN2
2,4-DICHLORO-3-AMINOPYRIDINE 2,4-DICHLORO-3-AMINOPYRIDINE 173772-63-9 C5H4Cl2N2
2-Methylpyrimidine-5-carbaldehyde 2-Methylpyrimidine-5-carbaldehyde 90905-33-2 C6H6N2O
4-AMINO-PYRIDIN-2-OL 4-AMINO-PYRIDIN-2-OL 38767-72-5 C5H6N2O
2-Chloro-3-bromo-5-methylpyridine 2-Chloro-3-bromo-5-methylpyridine 17282-03-0 C6H5BrClN
2-IODO-3-HYDROXYPYRIDINE 2-IODO-3-HYDROXYPYRIDINE 40263-57-8 C5H4INO
4-Methylpyridine-3-boronic acid 4-Methylpyridine-3-boronic acid 148546-82-1 C6H8BNO2
3,5-Dibromopyridine 3,5-Dibromopyridine 625-92-3 C5H3Br2N
3-Cyano-4-methylpyridine 3-Cyano-4-methylpyridine 5444-01-9 C7H6N2
2-Bromo-3-trifluoromethylpyridine 2-Bromo-3-trifluoromethylpyridine 175205-82-0 C6H3BrF3N
2-AMINO-3,5-DIBROMO-6-METHYLPYRIDINE 2-AMINO-3,5-DIBROMO-6-METHYLPYRIDINE 91872-10-5 C6H6Br2N2
2-Amino-3-fluoropyridine 2-Amino-3-fluoropyridine 21717-95-3 C5H5FN2
2-Chloro-5-acetylpyridine 2-Chloro-5-acetylpyridine 55676-22-7 C7H6ClNO
3-Hydroxy-2-methylpyridine 3-Hydroxy-2-methylpyridine 1121-25-1 C6H7NO
2-Amino-3,5-dibromo-4-methylpyridine 2-Amino-3,5-dibromo-4-methylpyridine 3430-29-3 C6H6Br2N2
2,6-Dichloropyridine 2,6-Dichloropyridine 2402-78-0 C5H3Cl2N
3,5-Dimethyl-2-hydroxymethyl-4-nitropyridine 3,5-Dimethyl-2-hydroxymethyl-4-nitropyridine 149082-03-1 C8H10N2O3
7-(TRIFLUOROMETHYL)-4-QUINOLINOL 7-(TRIFLUOROMETHYL)-4-QUINOLINOL 322-97-4 C10H6F3NO
4-AMINO-6-MERCAPTOPYRAZOLO[3,4-D]PYRIMIDINE 4-AMINO-6-MERCAPTOPYRAZOLO[3,4-D]PYRIMIDINE 23771-52-0 C5H5N5S
2-Chloro-3-methylpyridine 2-Chloro-3-methylpyridine 18368-76-8 C6H6ClN
3-BROMO-4-CHLORO-1H-PYRAZOLO[3,4-D]PYRIMIDINE 3-BROMO-4-CHLORO-1H-PYRAZOLO[3,4-D]PYRIMIDINE 90914-41-3 C5H2BrClN4
1-(3-Pyridyl)-3-(dimethylamino)-2-propen-1-one 1-(3-Pyridyl)-3-(dimethylamino)-2-propen-1-one 55314-16-4 C10H12N2O
Pyridazin-3-amine Pyridazin-3-amine 5469-70-5 C4H5N3
2,2':6',2''-TERPYRIDINE 2,2':6',2''-TERPYRIDINE 1148-79-4 C15H11N3
3-Aminopyridazine hydrochloride 3-Aminopyridazine hydrochloride 89203-22-5 C4H6ClN3
S-Boc-2-mercapto-4,6-dimethylpyrimidine S-Boc-2-mercapto-4,6-dimethylpyrimidine 41840-28-2 C11H16N2O2S
2-Chloropyridine-5-sulfonyl chloride 2-Chloropyridine-5-sulfonyl chloride 6684-39-5 C5H3Cl2NO2S
4-AMINO-2,6-DIMETHYLPYRIMIDINE 4-AMINO-2,6-DIMETHYLPYRIMIDINE 461-98-3 C6H9N3
6-AMINOPICOLINIC ACID METHYL ESTER 6-AMINOPICOLINIC ACID METHYL ESTER 36052-26-3 C7H8N2O2
2-Cyanopyrimidine 2-Cyanopyrimidine 14080-23-0 C5H3N3
2-Methoxy-4-methylpyridine 2-Methoxy-4-methylpyridine 100848-70-2 C7H9NO
4-(Trifluoromethyl)pyridine 4-(Trifluoromethyl)pyridine 3796-24-5 C6H4F3N
QUINOLINE HYDROCHLORIDE QUINOLINE HYDROCHLORIDE 530-64-3 C9H8ClN
2,3-Dibromopyridine 2,3-Dibromopyridine 13534-89-9 C5H3Br2N
2,5-Dibromopyrimidine 2,5-Dibromopyrimidine 32779-37-6 C4H2Br2N2
3-Amino-6-cyanopyridine 3-Amino-6-cyanopyridine 55338-73-3 C6H5N3
5-Methoxy-2,4-pyrimidinediol 5-Methoxy-2,4-pyrimidinediol 6623-81-0 C5H6N2O3
2,4,6-TRIFLUOROPYRIMIDINE 2,4,6-TRIFLUOROPYRIMIDINE 696-82-2 C4HF3N2
4-Picoline-N-oxide 4-Picoline-N-oxide 1003-67-4 C6H7NO
2-Chloro-4-(trifluoromethyl)pyrimidine 2-Chloro-4-(trifluoromethyl)pyrimidine 33034-67-2 C5H2ClF3N2
2-HYDROXY-3-NITROPYRIDINE 2-HYDROXY-3-NITROPYRIDINE 137280-55-8 C5H4N2O3
5-Bromo-2-fluoro-4-methyl-pyridine 5-Bromo-2-fluoro-4-methyl-pyridine 864830-16-0 C6H5BrFN
2-Chloro-6-methylpyridine 2-Chloro-6-methylpyridine 18368-63-3 C6H6ClN
ETHYL 6-FLUORO-4-HYDROXY-3-QUINOLINECARBOXYLATE ETHYL 6-FLUORO-4-HYDROXY-3-QUINOLINECARBOXYLATE 318-35-4 C12H10FNO3
1,2,4-Triazolo[4,3-a]pyridin-3(2H)-one 1,2,4-Triazolo[4,3-a]pyridin-3(2H)-one 6969-71-7 C6H5N3O
8-Hydroxyquinoline-2-carboxaldehyde 8-Hydroxyquinoline-2-carboxaldehyde 14510-06-6 C10H7NO2
2-Pyridylethylamine 2-Pyridylethylamine 2706-56-1 C7H10N2
Pyridin-2-ol Pyridin-2-ol 72762-00-6 C5H5NO
2-Amino-4-ethylpyridine 2-Amino-4-ethylpyridine 33252-32-3 C7H10N2
3-Chloro-2-hydroxy-5-nitropyridine 3-Chloro-2-hydroxy-5-nitropyridine 22353-38-4 C5H3ClN2O3
6-Chlorouracil 6-Chlorouracil 4270-27-3 C4H3ClN2O2
2,6-Di-tert-butyl-4-methylpyridine 2,6-Di-tert-butyl-4-methylpyridine 38222-83-2 C14H23N
2-Pyridinol-1-oxide 2-Pyridinol-1-oxide 13161-30-3 C5H5NO2
3-Bromo-5-(trifluoromethyl)pyridine 3-Bromo-5-(trifluoromethyl)pyridine 436799-33-6 C6H3BrF3N
2,4,5,6-TETRAAMINOPYRIMIDINE 2,4,5,6-TETRAAMINOPYRIMIDINE 1004-74-6 C4H8N6
2,5-Diamino-4,6-dichloropyrimidine 2,5-Diamino-4,6-dichloropyrimidine 55583-59-0 C4H4Cl2N4
Ethyl 5-amino-2-pyrazinecarboxylate Ethyl 5-amino-2-pyrazinecarboxylate 54013-06-8 C7H9N3O2
4-Amino-3,5-dichloropyridine 4-Amino-3,5-dichloropyridine 22889-78-7 C5H4Cl2N2
3-METHYL-2-PYRIDINECARBOXALDEHYDE 3-METHYL-2-PYRIDINECARBOXALDEHYDE 55589-47-4 C7H7NO
6-Chloropicolinic acid 6-Chloropicolinic acid 4684-94-0 C6H4ClNO2
DIETHYL(3-PYRIDYL)BORANE DIETHYL(3-PYRIDYL)BORANE 89878-14-8 C9H14BN
DI-2-PYRIDYL KETONE DI-2-PYRIDYL KETONE 19437-26-4 C11H8N2O
ETHYL 2-AMINO-4-(TRIFLUOROMETHYL)PYRIMIDINE-5-CARBOXYLATE ETHYL 2-AMINO-4-(TRIFLUOROMETHYL)PYRIMIDINE-5-CARBOXYLATE 149771-09-5 C8H8F3N3O2
2,5-Diamino-4,6-dihydroxypyrimidine hydrochloride 2,5-Diamino-4,6-dihydroxypyrimidine hydrochloride 56830-58-1 C4H7ClN4O2
3-ETHOXY-2-NITROPYRIDINE 3-ETHOXY-2-NITROPYRIDINE 74037-50-6 C7H8N2O3
5,6-Dimethoxypyrimidin-4-ylamine 5,6-Dimethoxypyrimidin-4-ylamine 5018-45-1 C6H9N3O2
6-CHLOROIMIDAZO[1,2-B]PYRIDAZINE-2-CARBOXYLIC ACID 6-CHLOROIMIDAZO[1,2-B]PYRIDAZINE-2-CARBOXYLIC ACID 14714-24-0 C7H4ClN3O2
3-METHYL-4-HYDROXYPYRIDINE 3-METHYL-4-HYDROXYPYRIDINE 22280-02-0 C6H7NO
5-Chloro-2-fluoro-3-methylpyridine 5-Chloro-2-fluoro-3-methylpyridine 375368-84-6 C6H5ClFN
3-Cyano-2-fluoropyridine 3-Cyano-2-fluoropyridine 3939-13-7 C6H3FN2
7-CHLORO-4-HYDROXY-2-(TRIFLUOROMETHYL)QUINOLINE 7-CHLORO-4-HYDROXY-2-(TRIFLUOROMETHYL)QUINOLINE 57124-20-6 C10H5ClF3NO
2-MERCAPTO-4-METHYLPYRIMIDINE HYDROCHLORIDE 2-MERCAPTO-4-METHYLPYRIMIDINE HYDROCHLORIDE 6959-66-6 C5H7ClN2S
3-CYANO-6-HYDROXYPYRIDINE 3-CYANO-6-HYDROXYPYRIDINE 94805-52-4 C6H4N2O
1-(5-BROMO-PYRIDIN-2-YL)-ETHANONE 1-(5-BROMO-PYRIDIN-2-YL)-ETHANONE 214701-49-2 C7H6BrNO
2-Bromo-6-hydroxypyridine 2-Bromo-6-hydroxypyridine 27992-32-1 C5H4BrNO
4-Amino-3,5-dichloro-2,6-difluoropyridine 4-Amino-3,5-dichloro-2,6-difluoropyridine 2840-00-8 C5H2Cl2F2N2
4-Chloro-3-cyanopyridine 4-Chloro-3-cyanopyridine 89284-61-7 C6H3ClN2
2,3,5-Collidine 2,3,5-Collidine 695-98-7 C8H11N
4,5-Dichloro-3(2H)-pyridazinone 4,5-Dichloro-3(2H)-pyridazinone 932-22-9 C4H2Cl2N2O
6-Methoxypyridine-2-carbaldehyde 6-Methoxypyridine-2-carbaldehyde 54221-96-4 C7H7NO2
5-BROMO-2-METHYL-3-NITROPHENYL METHYLCARBOXYLATE 5-BROMO-2-METHYL-3-NITROPHENYL METHYLCARBOXYLATE 220514-28-3 C9H8BrNO4
1,5-NAPHTHYRIDINE 1,5-NAPHTHYRIDINE 254-79-5 C8H6N2
5-CHLORO-2-HYDROXYPYRIMIDINE 5-CHLORO-2-HYDROXYPYRIMIDINE 54326-16-8 C4H3ClN2O
2-Ethynylthiophene 2-Ethynylthiophene 4298-52-6 C6H4S
PYRAZOLO[1,5-A]PYRIMIDINE-3-CARBOXYLIC ACID PYRAZOLO[1,5-A]PYRIMIDINE-3-CARBOXYLIC ACID 25940-35-6 C7H5N3O2
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