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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
THIENO[2,3-D]PYRIMIDIN-4-AMINE THIENO[2,3-D]PYRIMIDIN-4-AMINE 14080-56-9 C6H5N3S
2-METHOXY-3-NITRO-4-PICOLINE 2-METHOXY-3-NITRO-4-PICOLINE 160590-36-3 C7H8N2O3
2-AMINO-8-HYDROXYQUINOLINE 2-AMINO-8-HYDROXYQUINOLINE 70125-16-5 C9H8N2O
2-AMINO-6-ETHYLPYRIDINE 2-AMINO-6-ETHYLPYRIDINE 21717-29-3 C7H10N2
3-METHYLBENZO[B]THIOPHENE 3-METHYLBENZO[B]THIOPHENE 1455-18-1 C9H8S
2,5-DIBROMO-3-DODECYLTHIOPHENE 2,5-DIBROMO-3-DODECYLTHIOPHENE 148256-63-7 C16H26Br2S
2-Chloro-5-fluoro-4-methyl-pyridine 2-Chloro-5-fluoro-4-methyl-pyridine 881891-83-4 C6H5ClFN
3-Bromo-2-hydroxy-5-(trifluoromethyl)pyridine 3-Bromo-2-hydroxy-5-(trifluoromethyl)pyridine 76041-73-1 C6H3BrF3NO
2-AMINO-5-CARBOETHOXY-4-HYDROXYPYRIMIDINE 2-AMINO-5-CARBOETHOXY-4-HYDROXYPYRIMIDINE 15400-53-0 C7H9N3O3
Methyl 5-bromo-6-chloropyridine-3-carboxylate Methyl 5-bromo-6-chloropyridine-3-carboxylate 78686-77-8 C7H5BrClNO2
4,6-Dichloro-2-pyridinecarboxylic acid 4,6-Dichloro-2-pyridinecarboxylic acid 88912-25-8 C6H3Cl2NO2
2-Bromo-3-decylthiophene 2-Bromo-3-decylthiophene 144012-09-9 C14H23BrS
2-Hydroxy-4-methylpyridine-3-carbonitrile 2-Hydroxy-4-methylpyridine-3-carbonitrile 93271-59-1 C7H6N2O
2-BROMO-6-HYDRAZINYLPYRIDINE 2-BROMO-6-HYDRAZINYLPYRIDINE 26944-71-8 C5H6BrN3
6-Bromopyridine-2-boronic acid 6-Bromopyridine-2-boronic acid 440680-34-2 C5H5BBrNO2
4-Iodo-2-methoxypyridine-3-carboxaldehyde 4-Iodo-2-methoxypyridine-3-carboxaldehyde 158669-26-2 C7H6INO2
2,4-DIMETHOXYPYRIMIDINE-6-CARBOXYLIC ACID 2,4-DIMETHOXYPYRIMIDINE-6-CARBOXYLIC ACID 59864-30-1 C7H8N2O4
3,5-Dichloropyridazine 3,5-Dichloropyridazine 1837-55-4 C4H2Cl2N2
5-BROMO-2-METHOXY-PYRIDINE-3-CARBALDEHYDE 5-BROMO-2-METHOXY-PYRIDINE-3-CARBALDEHYDE 103058-87-3 C7H6BrNO2
4'-BROMO-2,2':6',2''-TERPYRIDINE 4'-BROMO-2,2':6',2''-TERPYRIDINE 149817-62-9 C15H10BrN3
2,4,5,6-TETRACHLOROPYRIMIDINE 2,4,5,6-TETRACHLOROPYRIMIDINE 14121-36-9 C5HCl4N
3-Methyl-6-methylaminouracil 3-Methyl-6-methylaminouracil 5759-63-7 C6H9N3O2
METHYL 5-FORMYL-2-THIOPHENECARBOXYLATE METHYL 5-FORMYL-2-THIOPHENECARBOXYLATE 67808-64-4 C7H6O3S
4,6-DIBROMOPYRIMIDINE 4,6-DIBROMOPYRIMIDINE 36847-10-6 C4H2Br2N2
2-AMINO-4-PIPERIDINO-6-METHYLPYRIMIDINE 2-AMINO-4-PIPERIDINO-6-METHYLPYRIMIDINE 91717-22-5 C10H16N4
4-(4,4,5,5-TETRAMETHYL-[1,3,2]DIOXABOROLAN-2-YL)-3,6-DIHYDRO-2H-PYRIDINE-1-CARBOXYLIC ACID BENZYL ESTER 4-(4,4,5,5-TETRAMETHYL-[1,3,2]DIOXABOROLAN-2-YL)-3,6-DIHYDRO-2H-PYRIDINE-1-CARBOXYLIC ACID BENZYL ESTER 286961-15-7 C19H26BNO4
6-AMINO-2-METHYLNICOTINONITRILE 6-AMINO-2-METHYLNICOTINONITRILE 183428-90-2 C7H7N3
2-HYDROXY-3-PYRAZINECARBOXYLIC ACID 2-HYDROXY-3-PYRAZINECARBOXYLIC ACID 20737-42-2 C5H4N2O3
3-METHOXYPYRIDAZINE 3-METHOXYPYRIDAZINE 19064-65-4 C5H6N2O
1-BENZOYLPIPERAZINE 1-BENZOYLPIPERAZINE 13754-38-6 C11H14N2O
7-N-PROPYL-8-HYDROXYQUINOLINE 7-N-PROPYL-8-HYDROXYQUINOLINE 58327-60-9 C12H13NO
4-CHLORO-5,6-DIMETHYLTHIENO[2,3-D]PYRIMIDINE 4-CHLORO-5,6-DIMETHYLTHIENO[2,3-D]PYRIMIDINE 108831-68-1 C8H7ClN2S
2-CHLORO-6-METHYLPYRIDINE-4-CARBONYL CHLORIDE 2-CHLORO-6-METHYLPYRIDINE-4-CARBONYL CHLORIDE 26413-58-1 C7H5Cl2NO
4-Methylpyridine-3-sulfonic acid 4-Methylpyridine-3-sulfonic acid 4808-71-3 C6H7NO3S
4-HYDRAZINO-2,6-DIMETHYLPYRIMIDINE 4-HYDRAZINO-2,6-DIMETHYLPYRIMIDINE 14331-56-7 C6H10N4
2-AMINO-3-CYANO-4-CHLORO-5-FORMYLTHIOPHENE 2-AMINO-3-CYANO-4-CHLORO-5-FORMYLTHIOPHENE 104366-23-6 C6H3ClN2OS
6,7-Dihydro-5-methyl-5(H)-cyclopentapyrazine 6,7-Dihydro-5-methyl-5(H)-cyclopentapyrazine 23747-48-0 C8H10N2
4-(PYRIMIDIN-5-YL)BENZALDEHYDE 4-(PYRIMIDIN-5-YL)BENZALDEHYDE 198084-12-7 C11H8N2O
1-METHANESULFONYL-PIPERAZINE 1-METHANESULFONYL-PIPERAZINE 55276-43-2 C5H12N2O2S
2-CHLORO-6-HYDRAZINOPYRIDINE 2-CHLORO-6-HYDRAZINOPYRIDINE 5193-03-3 C5H6ClN3
5-Amino-7-azaindole 5-Amino-7-azaindole 100960-07-4 C7H7N3
ETHYL 2-CHLORO-3-CYANO-6-METHYLISONICOTINATE ETHYL 2-CHLORO-3-CYANO-6-METHYLISONICOTINATE 40108-12-1 C10H9ClN2O2
1,2,3,4-TETRAHYDRO-ISOQUINOLIN-6-OL 1,2,3,4-TETRAHYDRO-ISOQUINOLIN-6-OL 14446-24-3 C9H11NO
5-PYRIMIDINEMETHANAMINE 5-PYRIMIDINEMETHANAMINE 25198-95-2 C5H7N3
3-Acetyl-2-bromopyridine 3-Acetyl-2-bromopyridine 84199-61-1 C7H6BrNO
2-AMINO-5-PHENYLPYRIDINE 2-AMINO-5-PHENYLPYRIDINE 33421-40-8 C11H10N2
3-AMINO-2-FLUORO-4-PICOLINE 3-AMINO-2-FLUORO-4-PICOLINE 173435-32-0 C6H7FN2
3-Cyano-6-(2-thienyl)-4-trifluoromethyl-2(1H)-pyridone 3-Cyano-6-(2-thienyl)-4-trifluoromethyl-2(1H)-pyridone 22123-11-1 C10H6F3NOS
1-tert-Butylpiperazine 1-tert-Butylpiperazine 38216-72-7 C8H18N2
4-HYDROXY-1-PHENYLPYRAZOLO[3,4-D]PYRIMIDINE 4-HYDROXY-1-PHENYLPYRAZOLO[3,4-D]PYRIMIDINE 21314-17-0 C11H8N4O
Bis(2,4,6-trimethylpyridine)iodine(I) hexafluorophosphate Bis(2,4,6-trimethylpyridine)iodine(I) hexafluorophosphate 113119-46-3 C16H22F6IN2P
4-CHLORO-5-METHOXYPYRIDAZIN-3(2H)-ONE 4-CHLORO-5-METHOXYPYRIDAZIN-3(2H)-ONE 63910-43-0 C5H5ClN2O2
3,4-Dihydro-2H-pyran-2-methanol 3,4-Dihydro-2H-pyran-2-methanol 3749-36-8 C6H10O2
3-Hydroxy-4-methylpyridine 3-Hydroxy-4-methylpyridine 1121-19-3 C6H7NO
5-Bromo-3-cyano-2-hydroxypyridine 5-Bromo-3-cyano-2-hydroxypyridine 405224-22-8 C6H3BrN2O
6-Bromoquinolin-2-amine 6-Bromoquinolin-2-amine 791626-58-9 C9H7BrN2
5-BROMO-3-CHLORO-2-HYDROXYPYRIDINE 5-BROMO-3-CHLORO-2-HYDROXYPYRIDINE 58236-70-7 C5H3BrClNO
4,6-DICHLORO-2-(METHYLTHIO)PYRIMIDINE-5-CARBONITRILE 4,6-DICHLORO-2-(METHYLTHIO)PYRIMIDINE-5-CARBONITRILE 33097-13-1 C6H3Cl2N3S
6-PHENYL-3(2H)-PYRIDAZINONE 6-PHENYL-3(2H)-PYRIDAZINONE 2166-31-6 C10H8N2O
7-BENZYL-5,6,7,8-TETRAHYDRO4-CHLORO-PYRIDO[3,4-D]PYRIMIDINE HYDROCHLORIDE 7-BENZYL-5,6,7,8-TETRAHYDRO4-CHLORO-PYRIDO[3,4-D]PYRIMIDINE HYDROCHLORIDE 192869-80-0 C14H14ClN3
2-FLUORO-3-FORMYLPYRIDINE 2-FLUORO-3-FORMYLPYRIDINE 36404-90-7 C6H4FNO
4-BENZYLAMINO-3-NITROPYRIDINE 4-BENZYLAMINO-3-NITROPYRIDINE 100306-70-5 C12H11N3O2
SCOPARONE SCOPARONE 120-08-1 C11H10O4
N-BENZYLCINCHONINIUM CHLORIDE N-BENZYLCINCHONINIUM CHLORIDE 69221-14-3 C26H29ClN2O
Borane-2-picoline complex Borane-2-picoline complex 3999-38-0 C6H10BN
2-HYDROXY-3-IODO-5-NITROPYRIDINE  97 2-HYDROXY-3-IODO-5-NITROPYRIDINE 97 25391-58-6 C5H3IN2O3
3,6-Diiodopyridazine 3,6-Diiodopyridazine 20698-04-8 C4H2I2N2
2-CHLORO-3-FLUORO-4-FORMYLPYRIDINE 2-CHLORO-3-FLUORO-4-FORMYLPYRIDINE 329794-28-7 C6H3ClFNO
PYRIMIDINE-4-CARBOXYLIC ACID METHYL ESTER PYRIMIDINE-4-CARBOXYLIC ACID METHYL ESTER 2450-08-0 C6H6N2O2
4-CHLORO-7-METHYLTHIENO[3,2-D]PYRIMIDINE 4-CHLORO-7-METHYLTHIENO[3,2-D]PYRIMIDINE 175137-21-0 C7H5ClN2S
1-Bromoisoquinoline 1-Bromoisoquinoline 1532-71-4 C9H6BrN
1-BUTYL-4-METHYLPYRIDINIUM BROMIDE 1-BUTYL-4-METHYLPYRIDINIUM BROMIDE 65350-59-6 C10H16BrN
2-FLUORO-4-METHYLPYRIDINE-5-BORONIC ACID 2-FLUORO-4-METHYLPYRIDINE-5-BORONIC ACID 1072944-18-3 C6H7BFNO2
2-BROMO-5-FLUORO-2-HYDROXYPYRIDINE 2-BROMO-5-FLUORO-2-HYDROXYPYRIDINE 884494-94-4 C5H3BrFNO
6-BROMO-[1,2,4]TRIAZOLO[1,5-A]PYRIDINE 6-BROMO-[1,2,4]TRIAZOLO[1,5-A]PYRIDINE 356560-80-0 C6H4BrN3
2-BROMO-6-ETHOXY PYRIDINE 2-BROMO-6-ETHOXY PYRIDINE 4645-11-8 C7H8BrNO
3-FLUORO-2-METHYLPYRIDINE 3-FLUORO-2-METHYLPYRIDINE 15931-15-4 C6H6FN
5-Amino-2,6-dimethylpyrimidine 5-Amino-2,6-dimethylpyrimidine 35733-53-0 C6H9N3
8-Hydroxyisoquinoline 8-Hydroxyisoquinoline 3482-14-2 C9H7NO
5-Bromo-2-(dimethylamino)pyridine 5-Bromo-2-(dimethylamino)pyridine 26163-07-5 C7H9BrN2
3-Amino-5-bromo-2-fluoropyridine 3-Amino-5-bromo-2-fluoropyridine 884495-22-1 C5H4BrFN2
5-ACETYL-2-METHOXYPYRIDINE, 97% 5-ACETYL-2-METHOXYPYRIDINE, 97% 213193-32-9 C8H9NO2
2-METHYL-6-ETHOXYQUINOLINE 2-METHYL-6-ETHOXYQUINOLINE 6628-28-0 C12H13NO
2-AMINO-5-CHLORO-6-PICOLINE 2-AMINO-5-CHLORO-6-PICOLINE 36936-23-9 C6H7ClN2
3,5-dimethylpyridin-4-amine 3,5-dimethylpyridin-4-amine 43078-60-0 C7H10N2
6-Bromo-1-chloroisoquinoline 6-Bromo-1-chloroisoquinoline 205055-63-6 C9H5BrClN
6-Methylpyridine-3-sulfonic acid 6-Methylpyridine-3-sulfonic acid 4808-69-9 C6H7NO3S
4-Bromonicotinic acid 4-Bromonicotinic acid 15366-62-8 C6H4BrNO2
ETHYL 3-(2-AMINO-5-BROMOPYRIDIN-3-YL)ACRYLATE ETHYL 3-(2-AMINO-5-BROMOPYRIDIN-3-YL)ACRYLATE 227963-57-7 C10H12N2O2
(2-BROMO-PYRIDIN-4-YL)CARBAMIC ACID TERT-BUTYL ESTER (2-BROMO-PYRIDIN-4-YL)CARBAMIC ACID TERT-BUTYL ESTER 433711-95-6 C10H13BrN2O2
1-[3-CHLORO-5-(TRIFLUOROMETHYL)PYRID-2-YL]PIPERAZINE 1-[3-CHLORO-5-(TRIFLUOROMETHYL)PYRID-2-YL]PIPERAZINE 132834-59-4 C10H11ClF3N3
2-Chloro-5-(trifluoromethyl)isonicotinic acid 97% 2-Chloro-5-(trifluoromethyl)isonicotinic acid 97% 505084-58-2 C7H3ClF3NO2
3-Pyridinecarboxamide,2-amino-(9CI) 3-Pyridinecarboxamide,2-amino-(9CI) 13438-65-8 C6H7N3O
Ethyl 2,4-dihydroxy-6-methyl-3-pyridinecarboxylate Ethyl 2,4-dihydroxy-6-methyl-3-pyridinecarboxylate 70254-52-3 C9H11NO4
2,4-Dichloropyridine-3-carboxaldehyde 2,4-Dichloropyridine-3-carboxaldehyde 134031-24-6 C6H3Cl2NO
2-AMINO-4-CHLORO-6-PHENYLPYRIMIDINE 2-AMINO-4-CHLORO-6-PHENYLPYRIMIDINE 36314-97-3 C10H8ClN3
2,4,6,8-TETRACHLOROPYRIMIDO[5,4-D]PYRIMIDINE 2,4,6,8-TETRACHLOROPYRIMIDO[5,4-D]PYRIMIDINE 32980-71-5 C6Cl4N4
6-chloropyrazine-2-carbonitrile 6-chloropyrazine-2-carbonitrile 6863-74-7 C5H2ClN3
3-ACETAMIDOPYRIDINE 3-ACETAMIDOPYRIDINE 5867-45-8 C7H8N2O
3-Amino-4,6-dimethylpyridine 3-Amino-4,6-dimethylpyridine 1193-71-1 C7H10N2
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