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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-Chloro-5-(trifluoromethyl)-3-pyridinecarboxylic acid 2-Chloro-5-(trifluoromethyl)-3-pyridinecarboxylic acid 505084-59-3 C7H3ClF3NO2
5-Bromo-2-methyl-4-pyrimidinecarboxylic acid 5-Bromo-2-methyl-4-pyrimidinecarboxylic acid 100707-39-9 C6H5BrN2O2
4,4'-Vinylenedipyridine 4,4'-Vinylenedipyridine 13362-78-2 C12H10N2
N-(4-Pyridyl)pyridinium chloride hydrochloride N-(4-Pyridyl)pyridinium chloride hydrochloride 5421-92-1 C10H10Cl2N2
2-AMINO-5-CYANOPYRAZINE 2-AMINO-5-CYANOPYRAZINE 113305-94-5 C5H4N4
2-ETHYL-6-METHYLPYRIDINE 2-ETHYL-6-METHYLPYRIDINE 1122-69-6 C8H11N
7-CHLORO-3-METHYL BENZO[B]THIOPHENE 7-CHLORO-3-METHYL BENZO[B]THIOPHENE 17514-68-0 C9H7ClS
3,4-Dihydroxypyridine 3,4-Dihydroxypyridine 10182-48-6 C5H5NO2
QUINOLINE N-OXIDE HYDRATE QUINOLINE N-OXIDE HYDRATE 64201-64-5 C9H9NO2
2-Mercapto-4,6-dimethoxypyrimidine 2-Mercapto-4,6-dimethoxypyrimidine 57235-35-5 C6H8N2O2S
6,6'-Dimethyl-2,2'-dipyridyl 6,6'-Dimethyl-2,2'-dipyridyl 4411-80-7 C12H12N2
1-(4-BROMOPHENYL)PIPERAZINE HYDROCHLORIDE 1-(4-BROMOPHENYL)PIPERAZINE HYDROCHLORIDE 68104-62-1 C10H14BrClN2
3-BROMO-5-CHLORO-2-HYDROXYPYRIDINE 3-BROMO-5-CHLORO-2-HYDROXYPYRIDINE 137628-16-1 C5H3BrClNO
ETHYL 2-CHLOROISONICOTINATE ETHYL 2-CHLOROISONICOTINATE 54453-93-9 C8H8ClNO2
4-Aminotetrahydropyran hydrochloride 4-Aminotetrahydropyran hydrochloride 33024-60-1 C5H12ClNO
2,4-DIMETHYL-3-PYRIDINECARBOXYLIC ACID 2,4-DIMETHYL-3-PYRIDINECARBOXYLIC ACID 55314-30-2 C8H9NO2
8-ETHOXYQUINOLINE-5-SULFONIC ACID 8-ETHOXYQUINOLINE-5-SULFONIC ACID 15301-40-3 C11H11NO4S
2-(BOC-AMINO)-3-METHYLPYRIDINE 2-(BOC-AMINO)-3-METHYLPYRIDINE 138343-75-6 C11H16N2O2
4-HYDROXY-7-TRIFLUOROMETHYL-3-QUINOLINECARBOXYLIC ACID 4-HYDROXY-7-TRIFLUOROMETHYL-3-QUINOLINECARBOXYLIC ACID 574-92-5 C11H6F3NO3
2,3-Pyridinedicarboxylic acid 2,3-Pyridinedicarboxylic acid 339155-13-4 C7H5NO4
2,3-Pyridinedicarboxylic acid 2,3-Pyridinedicarboxylic acid 339155-13-4 C7H5NO4
4-HYDRAZINO-3-NITROPYRIDINE 4-HYDRAZINO-3-NITROPYRIDINE 33544-42-2 C5H6N4O2
3-CHLORO-2-METHYLPYRIDINE 3-CHLORO-2-METHYLPYRIDINE 72093-03-9 C6H6ClN
7-BENZYLOXY-4-CHLOROQUINOLINE 7-BENZYLOXY-4-CHLOROQUINOLINE 178984-56-0 C16H12ClNO
2-Acetylamino-4-methylpyridine 2-Acetylamino-4-methylpyridine 5327-32-2 C8H10N2O
4-BENZYLOXY-5-BROMO-2-CHLOROPYRIMIDINE 4-BENZYLOXY-5-BROMO-2-CHLOROPYRIMIDINE 205672-19-1 C11H8BrClN2O
4-Ethoxy-3-nitropyridine hydrochloride 4-Ethoxy-3-nitropyridine hydrochloride 94602-04-7 C7H9ClN2O3
(R)-(+)-1-(4-PYRIDYL)ETHANOL (R)-(+)-1-(4-PYRIDYL)ETHANOL 27854-88-2 C7H9NO
2-CHLORO-1-METHYLPYRIDINIUM P-TOLUENESULFONATE 2-CHLORO-1-METHYLPYRIDINIUM P-TOLUENESULFONATE 7403-46-5 C13H14ClNO3S
3-(TRIMETHYLSILYLETHYNYL)PYRIDINE 3-(TRIMETHYLSILYLETHYNYL)PYRIDINE 80673-00-3 C10H13NSi
5H-Pyrrolo[3,4-b]pyridine-5,7(6H)-dione 5H-Pyrrolo[3,4-b]pyridine-5,7(6H)-dione 4664-00-0 C7H4N2O2
2-(4-METHOXY-PHENYL)-PIPERAZINE 2-(4-METHOXY-PHENYL)-PIPERAZINE 91517-26-9 C11H16N2O
3-AMINOTHIOPHENE-2-CARBOXAMIDE 3-AMINOTHIOPHENE-2-CARBOXAMIDE 147123-47-5 C5H6N2OS
4-Nitropyridine 4-Nitropyridine 1122-61-8 C5H4N2O2
Methyl 4-iodopyridine-2-carboxylate Methyl 4-iodopyridine-2-carboxylate 380381-28-2 C7H6INO2
3-BROMO-5-CHLORO-2-FLUOROPYRIDINE 3-BROMO-5-CHLORO-2-FLUOROPYRIDINE 884494-87-5 C5H2BrClFN
METHYL 5-BROMO-2-(METHYLSULFANYL)-4-PYRIMIDINECARBOXYLATE, 97 METHYL 5-BROMO-2-(METHYLSULFANYL)-4-PYRIMIDINECARBOXYLATE, 97 50593-91-4 C7H7BrN2O2S
4,4'-Bis(hydroxymethyl)-2,2'-bipyridine 4,4'-Bis(hydroxymethyl)-2,2'-bipyridine 109073-77-0 C12H12N2O2
5-BROMOPYRIMIDIN-4-AMINE 5-BROMOPYRIMIDIN-4-AMINE 1439-10-7 C4H4BrN3
2-METHYLSULFANYL-PYRIMIDINE-5-CARBALDEHYDE 2-METHYLSULFANYL-PYRIMIDINE-5-CARBALDEHYDE 90905-31-0 C6H6N2OS
4-Chloro-6-methylquinoline 4-Chloro-6-methylquinoline 18436-71-0 C10H8ClN
2-Chloro-6-nitropyridine 2-Chloro-6-nitropyridine 94166-64-0 C5H3ClN2O2
4-HYDROXYQUINOLINE-3-CARBOXYLIC ACID ETHYL ESTER 4-HYDROXYQUINOLINE-3-CARBOXYLIC ACID ETHYL ESTER 26892-90-0 C12H11NO3
CINCHONIDINE SULFATE CINCHONIDINE SULFATE 524-61-8 C38H46N4O6S
1,2,3,4-TETRAHYDROQUINOLIN-6-OL 1,2,3,4-TETRAHYDROQUINOLIN-6-OL 3373-00-0 C9H11NO
4-CHLORO-2-(METHYLSULFANYL)-6-(TRIFLUOROMETHYL)PYRIMIDINE 4-CHLORO-2-(METHYLSULFANYL)-6-(TRIFLUOROMETHYL)PYRIMIDINE 16097-63-5 C6H4ClF3N2S
4-CHLOROFURO[3,2-C]PYRIDINE 4-CHLOROFURO[3,2-C]PYRIDINE 31270-80-1 C7H4ClNO
4-Chloro-6-(1H-imidazol-1-yl)pyrimidine 4-Chloro-6-(1H-imidazol-1-yl)pyrimidine 114834-02-5 C7H5ClN4
2,5-DICHLORO-4-FORMYLPYRIDINE 2,5-DICHLORO-4-FORMYLPYRIDINE 102645-33-0 C6H3Cl2NO
5-NITRO-PYRIMIDIN-2-OL 5-NITRO-PYRIMIDIN-2-OL 3264-10-6 C4H3N3O3
3-Chloro-4-methylpyridazine 3-Chloro-4-methylpyridazine 68206-04-2 C5H5ClN2
2-FLUORO-3-BROMO-5-NITRO PYRIDINE 2-FLUORO-3-BROMO-5-NITRO PYRIDINE 1868-58-2 C5H2BrFN2O2
2-Chloro-5-(phenylmethoxy)-pyrimidine 2-Chloro-5-(phenylmethoxy)-pyrimidine 138274-14-3 C11H9ClN2O
5-(TRIFLUOROMETHYL)PYRIDINE-2-CARBOXAMIDE OXIME 5-(TRIFLUOROMETHYL)PYRIDINE-2-CARBOXAMIDE OXIME 175277-44-8 C7H6F3N3O
6-hydroxy-4-methyl-2-pyridone 6-hydroxy-4-methyl-2-pyridone 4664-16-8 C6H7NO2
4,6-Dichloro-2-methyl-5-nitropyrimidine 4,6-Dichloro-2-methyl-5-nitropyrimidine 13162-43-1 C5H3Cl2N3O2
3,4-Diamino-2-hydroxypyridine 3,4-Diamino-2-hydroxypyridine 33631-02-6 C5H7N3O
4,6-DIAMINO-5-NITROPYRIMIDINE 4,6-DIAMINO-5-NITROPYRIMIDINE 2164-84-3 C4H5N5O2
3-Bromo-2-trifluoromethylpyridine 3-Bromo-2-trifluoromethylpyridine 590371-58-7 C6H3BrF3N
4-(4,6-Dichloropyrimidin-2-yl)morpholine 4-(4,6-Dichloropyrimidin-2-yl)morpholine 10397-13-4 C8H9Cl2N3O
4-CHLOROPYRIDO[2,3-D]PYRIMIDINE 4-CHLOROPYRIDO[2,3-D]PYRIMIDINE 28732-79-8 C7H4ClN3
2-Chloropyrimidine-4-carbonitrile 2-Chloropyrimidine-4-carbonitrile 75833-38-4 C5H2ClN3
4-AMINO-3-BROMO-2-CHLOROPYRIDINE 4-AMINO-3-BROMO-2-CHLOROPYRIDINE 215364-85-5 C5H4BrClN2
N-(3-IODO-PYRIDIN-2-YL)-2,2-DIMETHYL-PROPIONAMIDE N-(3-IODO-PYRIDIN-2-YL)-2,2-DIMETHYL-PROPIONAMIDE 113975-31-8 C10H13IN2O
Pyrazine-2,5-dicarboxylic acid Pyrazine-2,5-dicarboxylic acid 122-05-4 C6H4N2O4
4-AMINO-2-(METHYLTHIO)PYRIMIDINE-5-CARBONITRILE 4-AMINO-2-(METHYLTHIO)PYRIMIDINE-5-CARBONITRILE 770-30-9 C6H6N4S
Methyl 5-aminopyridine-3-carboxylate Methyl 5-aminopyridine-3-carboxylate 36052-25-2 C7H8N2O2
3,5-DIBROMOPYRIDINE 1-OXIDE 3,5-DIBROMOPYRIDINE 1-OXIDE 2402-99-5 C5H3Br2NO
5-CHLORO-2-PICOLINE 5-CHLORO-2-PICOLINE 72093-07-3 C6H6ClN
3-Acetyl-2-fluoropyridine 3-Acetyl-2-fluoropyridine 79574-70-2 C7H6FNO
4-Aminoisoquinoline 4-Aminoisoquinoline 23687-25-4 C9H8N2
6-bromo-4-chlorothieno[3,2-d]pyrimidine 6-bromo-4-chlorothieno[3,2-d]pyrimidine 225385-03-5 C6H2BrClN2S
2-Bromopyrazine 2-Bromopyrazine 56423-63-3 C4H3BrN2
6-BROMO-PYRAZOLO[1,5-A]PYRIMIDINE 6-BROMO-PYRAZOLO[1,5-A]PYRIMIDINE 705263-10-1 C6H4BrN3
4-CHLORO-PYRIMIDINE-5-CARBOXYLIC ACID ETHYL ESTER 4-CHLORO-PYRIMIDINE-5-CARBOXYLIC ACID ETHYL ESTER 41103-17-7 C7H7ClN2O2
1-Boc-piperazine acetate 1-Boc-piperazine acetate 143238-38-4 C11H22N2O4
2-Chloro-3-fluoropyridine-4-carboxylic acid 2-Chloro-3-fluoropyridine-4-carboxylic acid 628691-93-0 C6H3ClFNO2
6-CYANONICOTINIC ACID 6-CYANONICOTINIC ACID 70165-31-0 C7H4N2O2
3-BROMO-6-HYDROXY-2-METHYLPYRIDINE 3-BROMO-6-HYDROXY-2-METHYLPYRIDINE 54923-31-8 C6H6BrNO
2-Chloro-6-methylpyrazine 2-Chloro-6-methylpyrazine 38557-71-0 C5H5ClN2
2-(4-Methylphenyl)pyridine 2-(4-Methylphenyl)pyridine 4467-06-5 C12H11N
TMPYP TMPYP 36951-72-1 C72H66N8O12S4
2-METHYL-6-NITROPYRIDINE 2-METHYL-6-NITROPYRIDINE 18368-61-1 C6H6N2O2
3,4-DIHYDRO-2H-PYRIDO[1,2-A]PYRIMIDIN-2-ONE 3,4-DIHYDRO-2H-PYRIDO[1,2-A]PYRIMIDIN-2-ONE 5439-14-5 C8H8N2O
2-AMINO-4-PHENYL-6-(TRIFLUOROMETHYL)PYRIMIDINE 2-AMINO-4-PHENYL-6-(TRIFLUOROMETHYL)PYRIMIDINE 26974-09-4 C11H8F3N3
5-BROMO-2-HYDRAZINOPYRIMIDINE 5-BROMO-2-HYDRAZINOPYRIMIDINE 823-89-2 C4H5BrN4
2-AMINO-3-ETHYL-6-METHYLPYRIDINE 2-AMINO-3-ETHYL-6-METHYLPYRIDINE 41995-31-7 C8H12N2
6,7-Dimethoxy-3,4-dihydroisoquinoline hydrochloride 6,7-Dimethoxy-3,4-dihydroisoquinoline hydrochloride 20232-39-7 C11H14ClNO2
2-IODO-5-METHYLTHIOPHENE 2-IODO-5-METHYLTHIOPHENE 16494-36-3 C5H5IS
4-CHLORO-PYRIDINE-2,6-DICARBOXYLIC ACID 4-CHLORO-PYRIDINE-2,6-DICARBOXYLIC ACID 4722-94-5 C7H4ClNO4
4-CHLORO-5,6-DIMETHYL-2-(TRIFLUOROMETHYL)PYRIMIDINE 4-CHLORO-5,6-DIMETHYL-2-(TRIFLUOROMETHYL)PYRIMIDINE 175277-32-4 C7H6ClF3N2
1-(3-IODO-PYRIDIN-2-YL)-PIPERAZINE 1-(3-IODO-PYRIDIN-2-YL)-PIPERAZINE 85386-98-7 C9H12IN3
3-Chlorothiophene-2-carboxylic acid 3-Chlorothiophene-2-carboxylic acid 59337-89-2 C5H3ClO2S
2-FLUORO-6-HYDROXYPYRIDINE 2-FLUORO-6-HYDROXYPYRIDINE 50543-23-2 C5H4FNO
3-Fluoro-2-methoxy-6-picoline 3-Fluoro-2-methoxy-6-picoline 375368-80-2 C7H8FNO
1-Boc-4-(4-methoxycarbonylphenyl)piperazine 1-Boc-4-(4-methoxycarbonylphenyl)piperazine 158985-36-5 C17H24N2O4
2-(2-BROMOETHOXY)TETRAHYDRO-2H-PYRAN 2-(2-BROMOETHOXY)TETRAHYDRO-2H-PYRAN 17739-45-6 C7H13BrO2
2-Chloro-3-methoxypyridine 2-Chloro-3-methoxypyridine 52605-96-6 C6H6ClNO
3-Nitroisonicotinic acid 3-Nitroisonicotinic acid 59290-82-3 C6H4N2O4
6,7-DIHYDRO-5H-1-PYRIDIN-5-ONE 6,7-DIHYDRO-5H-1-PYRIDIN-5-ONE 28566-14-5 C8H7NO
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