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
3,5-Dimethyl-4-methoxy-2-pyridinemethanol 3,5-Dimethyl-4-methoxy-2-pyridinemethanol 86604-78-6 C9H13NO2
3-AMINO-2-METHOXY-6-PICOLINE 3-AMINO-2-METHOXY-6-PICOLINE 186413-79-6 C7H10N2O
2,4,6-TRIMETHYLPYRIDINIUM P-TOLUENESULFONATE 2,4,6-TRIMETHYLPYRIDINIUM P-TOLUENESULFONATE 59229-09-3 C15H19NO3S
2,3-Lutidine 2,3-Lutidine 583-61-9 C7H9N
2-(Bromomethyl)-6-methylpyridine 2-(Bromomethyl)-6-methylpyridine 68470-59-7 C7H8BrN
2-MERCAPTO-5-NITROPYRIDINE 2-MERCAPTO-5-NITROPYRIDINE 2127-09-5 C5H4N2O2S
5-CYANOPYRIMIDINE 5-CYANOPYRIMIDINE 40805-79-6 C5H3N3
4-AMINOPYRIMIDINE-5-CARBONITRILE 4-AMINOPYRIMIDINE-5-CARBONITRILE 16357-69-0 C5H4N4
2-FLUORO-4-(TRIFLUOROMETHYL)PHENYLBORONIC ACID 2-FLUORO-4-(TRIFLUOROMETHYL)PHENYLBORONIC ACID 503309-11-3 C7H5BF4O2
2-Chloropyrimidine-5-carboxylic acid 2-Chloropyrimidine-5-carboxylic acid 374068-01-6 C5H3ClN2O2
5-BROMO-2-CHLORO-4-PICOLINE 5-BROMO-2-CHLORO-4-PICOLINE 778611-64-6 C6H5BrClN
1-Piperazinecarbaldehyde 1-Piperazinecarbaldehyde 7755-92-2 C5H10N2O
4-METHYL-2-(METHYLSULFANYL)PYRIMIDINE 4-METHYL-2-(METHYLSULFANYL)PYRIMIDINE 14001-63-9 C6H8N2S
2-Fluoro-5-iodopyridine 2-Fluoro-5-iodopyridine 171197-80-1 C5H3FIN
3,5-DIBROMO-2-FLUOROPYRIDINE 3,5-DIBROMO-2-FLUOROPYRIDINE 473596-07-5 C5H2Br2FN
2-Anilinopyridine 2-Anilinopyridine 6631-37-4 C11H10N2
3-Hydroxy-6-methyl-2-pyridinemethanol 3-Hydroxy-6-methyl-2-pyridinemethanol 42097-42-7 C7H9NO2
2-Bromo-5-nitro-4-picoline 2-Bromo-5-nitro-4-picoline 23056-47-5 C6H5BrN2O2
5-Amino-2-(trifluoromethyl)pyridine 5-Amino-2-(trifluoromethyl)pyridine 106877-33-2 C6H5F3N2
3-AMINO-6-METHYLPYRIDAZINE 3-AMINO-6-METHYLPYRIDAZINE 18591-82-7 C5H7N3
5-Chloro-3-nitropyridine-2-carbonitrile 5-Chloro-3-nitropyridine-2-carbonitrile 181123-11-5 C6H2ClN3O2
Pyrimidinetetramine sulfate Pyrimidinetetramine sulfate 5392-28-9 C4H10N6O4S
2-Trifluoromethyl-5-bromopyridine 2-Trifluoromethyl-5-bromopyridine 436799-32-5 C6H3BrF3N
2-Amino-5-bromo-6-methylpyridine 2-Amino-5-bromo-6-methylpyridine 42753-71-9 C6H7BrN2
4-CHLOROTHIENO[2,3-D]PYRIMIDINE 4-CHLOROTHIENO[2,3-D]PYRIMIDINE 14080-59-2 C6H3ClN2S
Isoquinolin-6-ol Isoquinolin-6-ol 7651-82-3 C9H7NO
2,5-Diamino-4,6-dihydroxy-pyrimidine 2,5-Diamino-4,6-dihydroxy-pyrimidine 40769-69-5 C4H6N4O2
3-(Trifluoromethyl)pyrid-2-ylhydrazine 3-(Trifluoromethyl)pyrid-2-ylhydrazine 89570-83-2 C6H6F3N3
Tetrahydrothiopyran-4-one Tetrahydrothiopyran-4-one 1072-72-6 C5H8OS
2,5,6-Tribromo-3-methylpyridine 2,5,6-Tribromo-3-methylpyridine 393516-82-0 C6H4Br3N
4-Ethylpyridine 4-Ethylpyridine 536-75-4 C7H9N
3,5-Dichloropyridine 3,5-Dichloropyridine 2457-47-8 C5H3Cl2N
2,4-Dimethoxyprimidine-5-boronic acid 2,4-Dimethoxyprimidine-5-boronic acid 89641-18-9 C6H9BN2O4
5-Chloropyrimidine 5-Chloropyrimidine 17180-94-8 C4H3ClN2
4-Chloro-3-fluoropyridine 4-Chloro-3-fluoropyridine 2546-56-7 C5H3ClFN
2-Amino-4,6-dimethoxypyrimidine 2-Amino-4,6-dimethoxypyrimidine 36315-01-2 C6H9N3O2
4-Pyridylcarbinol 4-Pyridylcarbinol 586-95-8 C6H7NO
3,5-Dichloro-2-cyanopyridine 3,5-Dichloro-2-cyanopyridine 85331-33-5 C6H2Cl2N2
2,5-Dibromo-3-octylthiophene 2,5-Dibromo-3-octylthiophene 149703-84-4 C12H18Br2S
2-Fluoro-5-nitropyridine 2-Fluoro-5-nitropyridine 456-24-6 C5H3FN2O2
5-Chloro-2-cyanopyridine 5-Chloro-2-cyanopyridine 89809-64-3 C6H3ClN2
2-Chloro-3-bromo-5-aminopyridine 2-Chloro-3-bromo-5-aminopyridine 130284-53-6 C5H4BrClN2
1-(5-Methyl-2-thienyl)ethan-1-one 1-(5-Methyl-2-thienyl)ethan-1-one 13679-74-8 C7H8OS
2-Amino-5-cyanopyridine 2-Amino-5-cyanopyridine 4214-73-7 C6H5N3
2-Chloro-5-trichloromethylpyridine 2-Chloro-5-trichloromethylpyridine 69045-78-9 C6H3Cl4N
2-(Trifluoromethyl)nicotinic acid 2-(Trifluoromethyl)nicotinic acid 131747-43-8 C7H4F3NO2
2-Amino-3-bromo-5-methylpyridine 2-Amino-3-bromo-5-methylpyridine 17282-00-7 C6H7BrN2
Isonicotinamide Isonicotinamide 1453-82-3 C6H6N2O
3,5-DICHLORO-2-PYRIDONE 3,5-DICHLORO-2-PYRIDONE 5437-33-2 C5H3Cl2NO
tert-Butyl 1-piperazinecarboxylate tert-Butyl 1-piperazinecarboxylate 57260-71-6 C9H18N2O2
5-Methylpyridin-2-ol 5-Methylpyridin-2-ol 91914-06-6 C6H7NO
3-Methyl-2-thiophenecarboxaldehyde 3-Methyl-2-thiophenecarboxaldehyde 5834-16-2 C6H6OS
2,4-DIFLUORO-PYRIDINE 2,4-DIFLUORO-PYRIDINE 34941-90-7 C5H3F2N
2-Amino-3-methyl-5-nitropyridine 2-Amino-3-methyl-5-nitropyridine 18344-51-9 C6H7N3O2
3-BROMO-4-CHLORO-5-NITROPYRIDINE 3-BROMO-4-CHLORO-5-NITROPYRIDINE 31872-63-6 C5H2BrClN2O2
4-Aminomethylquinoline hydrochloride 4-Aminomethylquinoline hydrochloride 5632-13-3 C10H10N2
2-Amino-6-methyl-4-pyrimidinol 2-Amino-6-methyl-4-pyrimidinol 3977-29-5 C5H7N3O
3-Cyano-6-methyl-2(1H)-pyridinone 3-Cyano-6-methyl-2(1H)-pyridinone 4241-27-4 C7H6N2O
4-Hydroxypyridine-2-carboxylic acid 4-Hydroxypyridine-2-carboxylic acid 22468-26-4 C6H5NO3
Methyl 2-amino-5-bromonicotinate Methyl 2-amino-5-bromonicotinate 50735-34-7 C7H7BrN2O2
3-BROMO-2-CHLORO-4-PICOLINE 3-BROMO-2-CHLORO-4-PICOLINE 55404-31-4 C6H5BrClN
2-Chloro-3-cyano-4,6-dimethylpyridine 2-Chloro-3-cyano-4,6-dimethylpyridine 14237-71-9 C8H7ClN2
METHYL 2-OXO-1,2-DIHYDRO-3-PYRIDINECARBOXYLATE METHYL 2-OXO-1,2-DIHYDRO-3-PYRIDINECARBOXYLATE 10128-91-3 C7H7NO3
Methyl 2-chloro-6-methylpyridine-4-carboxylate Methyl 2-chloro-6-methylpyridine-4-carboxylate 3998-90-1 C8H8ClNO2
5-CYANO-2-FLUORO-3-PICOLINE 5-CYANO-2-FLUORO-3-PICOLINE 261625-67-6 C7H5FN2
4-Chloropyridine-2-carboxamide 4-Chloropyridine-2-carboxamide 99586-65-9 C6H5ClN2O
2-Fluoro-6-methyl-3-nitropyridine 2-Fluoro-6-methyl-3-nitropyridine 19346-45-3 C6H5FN2O2
2,6-Dihydroxypyridine 2,6-Dihydroxypyridine 626-06-2 C5H5NO2
2-Bromo-5-(trifluoromethyl)pyridine 2-Bromo-5-(trifluoromethyl)pyridine 50488-42-1 C6H3BrF3N
2-Picoline-N-oxide 2-Picoline-N-oxide 931-19-1 C6H7NO
2,5-Dichloropyrimidine 2,5-Dichloropyrimidine 22536-67-0 C4H2Cl2N2
THIOPHENE-3,4-DICARBOXYLIC ACID THIOPHENE-3,4-DICARBOXYLIC ACID 4282-29-5 C6H4O4S
3-Pyridyl bromide 3-Pyridyl bromide 626-55-1 C5H4BrN
5-Amino-2-bromopyridine 5-Amino-2-bromopyridine 13534-97-9 C5H5BrN2
2-amino-5-bromopyridin-3-ol 2-amino-5-bromopyridin-3-ol 39903-01-0 C5H5BrN2O
3-Chloroisoquinoline 3-Chloroisoquinoline 19493-45-9 C9H6ClN
2-Chloro-5-methoxypyrimidine 2-Chloro-5-methoxypyrimidine 22536-65-8 C5H5ClN2O
2-Chloro-5-nitropyridin-4-amine 2-Chloro-5-nitropyridin-4-amine 2604-39-9 C5H4ClN3O2
6-Oxo-3H-pyrimidine-4-carboxylic acid 6-Oxo-3H-pyrimidine-4-carboxylic acid 6299-87-2 C5H4N2O3
5-AMINO-2-CHLOROPYRIDINE-4-CARBOXYLIC ACID 5-AMINO-2-CHLOROPYRIDINE-4-CARBOXYLIC ACID 58483-95-7 C6H5ClN2O2
3-(AMINOMETHYL)PYRIDINE 3-(AMINOMETHYL)PYRIDINE 20173-04-0 C7H10N2
Methyl 2-chloro-4-(trifluoromethyl)pyrimidine-5-carboxylate Methyl 2-chloro-4-(trifluoromethyl)pyrimidine-5-carboxylate 175137-27-6 C7H4ClF3N2O2
Methyl2,4-Dichloropyrimidine-5-carboxylate Methyl2,4-Dichloropyrimidine-5-carboxylate 3177-20-6 C6H4Cl2N2O2
2,3,5-Trichloropyridine 2,3,5-Trichloropyridine 16063-70-0 C5H2Cl3N
5-Chloro-2-nitropyridine 5-Chloro-2-nitropyridine 52092-47-4 C5H3ClN2O2
2-Chloro-3,5-dibromopyridine 2-Chloro-3,5-dibromopyridine 40360-47-2 C5H2Br2ClN
1-BENZHYDRYLPIPERAZINE 1-BENZHYDRYLPIPERAZINE 841-77-0 C17H20N2
6-FORMYL-URACIL MONOHYDRATE 6-FORMYL-URACIL MONOHYDRATE 36327-91-0 C5H4N2O3
4-BROMO-PYRIDINE-2-CARBONITRILE 4-BROMO-PYRIDINE-2-CARBONITRILE 62150-45-2 C6H3BrN2
2,6-Dichloro-3-nitropyridine 2,6-Dichloro-3-nitropyridine 16013-85-7 C5H2Cl2N2O2
5-BROMO-6-HYDROXYNICOTINIC ACID 5-BROMO-6-HYDROXYNICOTINIC ACID 41668-13-7 C6H4BrNO3
2-Hydroxypyridine 2-Hydroxypyridine 142-08-5 C5H5NO
3-Bromo-4-chloropyridine 3-Bromo-4-chloropyridine 36953-42-1 C5H3BrClN
2,4-DIAMINO-PYRIMIDINE-5-CARBALDEHYDE 2,4-DIAMINO-PYRIMIDINE-5-CARBALDEHYDE 20781-06-0 C5H6N4O
Picloram Picloram 1918-02-1 C6H3Cl3N2O2
4-AMINO-3-IODO-1H-PYRAZOLO[3,4-D]PYRIMIDINE 4-AMINO-3-IODO-1H-PYRAZOLO[3,4-D]PYRIMIDINE 151266-23-8 C5H4IN5
2,5-Dimethylpyridine 2,5-Dimethylpyridine 589-93-5 C7H9N
2,6-DIHYDROXYPYRIDINE HYDROCHLORIDE 2,6-DIHYDROXYPYRIDINE HYDROCHLORIDE 10357-84-3 C5H6ClNO2
2-Methoxy-3-(trifluoromethyl)pyridine 2-Methoxy-3-(trifluoromethyl)pyridine 121643-44-5 C7H6F3NO
1-Acetyl-4-piperidinecarboxylic acid 1-Acetyl-4-piperidinecarboxylic acid 25503-90-6 C8H13NO3
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