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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
5-BROMO-2-(DIMETHYLAMINO)PYRIMIDINE 5-BROMO-2-(DIMETHYLAMINO)PYRIMIDINE 38696-21-8 C6H8BrN3
SB 202190 SB 202190 152121-30-7 C20H14FN3O
3-HYDROXYPYRAZINE-2-CARBOXAMIDE 3-HYDROXYPYRAZINE-2-CARBOXAMIDE 55321-99-8 C5H5N3O2
2-BROMOPYRIDIN-4-YLBORONIC ACID 2-BROMOPYRIDIN-4-YLBORONIC ACID 458532-94-0 C5H5BBrNO2
3-CHLOROBENZO[B]THIOPHENE-2-CARBOXYLIC ACID 3-CHLOROBENZO[B]THIOPHENE-2-CARBOXYLIC ACID 21211-22-3 C9H5ClO2S
2-CHLORO-5-NITROPYRIMIDIN-4-AMINE 2-CHLORO-5-NITROPYRIMIDIN-4-AMINE 1920-66-7 C4H3ClN4O2
3-BROMO-5-(4,4,5,5-TETRAMETHYL-[1,3,2]DIOXABOROLAN-2-YL)-PYRIDINE 3-BROMO-5-(4,4,5,5-TETRAMETHYL-[1,3,2]DIOXABOROLAN-2-YL)-PYRIDINE 452972-13-3 C11H15BBrNO2
2,6-Pyridinedicarboxaldehyde 2,6-Pyridinedicarboxaldehyde 5431-44-7 C7H5NO2
4,5-DIHYDRO-4-OXOFURO[3,2-C]PYRIDINE 4,5-DIHYDRO-4-OXOFURO[3,2-C]PYRIDINE 26956-43-4 C7H5NO2
1-PYRIDIN-2-YL-ETHANOL 1-PYRIDIN-2-YL-ETHANOL 18728-61-5 C7H9NO
4-(4-CHLOROBENZYL)PYRIDINE 4-(4-CHLOROBENZYL)PYRIDINE 4409-11-4 C12H10ClN
3-BROMO-2-FLUORONITROBENZENE 3-BROMO-2-FLUORONITROBENZENE 58534-94-4 C6H3BrFNO2
6-chloro-3-nitroimidazo[1,2-b]pyridazine 6-chloro-3-nitroimidazo[1,2-b]pyridazine 18087-76-8 C6H3ClN4O2
4-HYDROXYQUINOLINE-3-CARBOXYLIC ACID 4-HYDROXYQUINOLINE-3-CARBOXYLIC ACID 34785-11-0 C10H7NO3
5-BROMO-2-METHOXY-3-NITRO-PYRIDINE 5-BROMO-2-METHOXY-3-NITRO-PYRIDINE 152684-30-5 C6H5BrN2O3
3-(2-Thienyl)benzoic acid 3-(2-Thienyl)benzoic acid 29886-63-3 C11H8O2S
3-Amino-2-bromo-4,6-dimethylpyridine 3-Amino-2-bromo-4,6-dimethylpyridine 104829-98-3 C7H9BrN2
2,5-Diaminopyrimidine 2,5-Diaminopyrimidine 22715-27-1 C4H6N4
5-ACETYL-2-AMINO-4-METHYLPYRIMIDINE 5-ACETYL-2-AMINO-4-METHYLPYRIMIDINE 66373-25-9 C7H9N3O
2,6-Difluoropyridine-4-boronic acid 2,6-Difluoropyridine-4-boronic acid 401816-16-8 C5H4BF2NO2
3-AMINO-5-BROMO-PYRIDIN-2-OL 3-AMINO-5-BROMO-PYRIDIN-2-OL 98786-86-8 C5H5BrN2O
5-AMINO-2-METHOXY-3-METHYLPYRIDINE HCL 5-AMINO-2-METHOXY-3-METHYLPYRIDINE HCL 867012-70-2 C7H10N2O
2-(4-BENZYLPIPERAZINO)BENZALDEHYDE 2-(4-BENZYLPIPERAZINO)BENZALDEHYDE 112253-26-6 C18H20N2O
2-ETHOXY-4,6-DIFLUOROPYRIMIDINE 2-ETHOXY-4,6-DIFLUOROPYRIMIDINE 166524-65-8 C6H6F2N2O
6,7-Dihydro-5H-pyrrolo[3,4-b]pyridine dihydrochloride 6,7-Dihydro-5H-pyrrolo[3,4-b]pyridine dihydrochloride 147740-02-1 C7H9ClN2
2-Methyl-4-pyrimidinecarboxylic acid 2-Methyl-4-pyrimidinecarboxylic acid 13627-49-1 C6H6N2O2
4-Chloro-2,6-dimethylpyridine 4-Chloro-2,6-dimethylpyridine 3512-75-2 C7H8ClN
4-HYDROXY-6-MERCAPTOPYRAZOLO[3,4-D]PYRIMIDINE 4-HYDROXY-6-MERCAPTOPYRAZOLO[3,4-D]PYRIMIDINE 24521-76-4 C5H4N4OS
2-HYDROXY-3-AMINO-5-PICOLINE 2-HYDROXY-3-AMINO-5-PICOLINE 52334-51-7 C6H8N2O
2-(Trifluoromethyl)pyrimidine-5-carboxylic acid 2-(Trifluoromethyl)pyrimidine-5-carboxylic acid 306960-77-0 C6H3F3N2O2
1-Benzothiophene-3-carbaldehyde 1-Benzothiophene-3-carbaldehyde 5381-20-4 C9H6OS
6-CHLORO-4-METHYLPYRIDINE-2-CARBOXYLIC ACID 6-CHLORO-4-METHYLPYRIDINE-2-CARBOXYLIC ACID 324028-95-7 C7H6ClNO2
2-Bromo-5-fluoro-3-nitropyridine 2-Bromo-5-fluoro-3-nitropyridine 652160-72-0 C5H2BrFN2O2
2-Fluoro-4-trifluoromethyl-pyridine 2-Fluoro-4-trifluoromethyl-pyridine 118078-66-3 C6H3F4N
2-Bromomethylquinoline 2-Bromomethylquinoline 5632-15-5 C10H8BrN
2-Bromo-3-methoxy-6-nitropyridine 2-Bromo-3-methoxy-6-nitropyridine 76066-07-4 C6H5BrN2O3
2-AMINO-6-T-BUTYL-4-(TRIFLUOROMETHYL)PYRIMIDINE 2-AMINO-6-T-BUTYL-4-(TRIFLUOROMETHYL)PYRIMIDINE 238742-83-1 C9H12F3N3
4(1H)-Pyrimidinone, 2-amino-6-methyl-5-nitro- 4(1H)-Pyrimidinone, 2-amino-6-methyl-5-nitro- 4214-85-1 C5H6N4O3
3-(Chloromethyl)-5-methylpyridine 3-(Chloromethyl)-5-methylpyridine 1007089-84-0 C7H8ClN
4-Bromopyridine 4-Bromopyridine 1120-87-2 C5H4BrN
5-Bromonicotinamide 5-Bromonicotinamide 28733-43-9 C6H5BrN2O
2-Bromo-3-cyanopyridine 2-Bromo-3-cyanopyridine 20577-26-8 C6H3BrN2
5-BROMO-3-METHOXYPYRAZIN-2-YLAMINE 5-BROMO-3-METHOXYPYRAZIN-2-YLAMINE 5900-13-0 C5H6BrN3O
2,4-dichloro-6-(trifluoromethyl)pyrimidine 2,4-dichloro-6-(trifluoromethyl)pyrimidine 16097-64-6 C5HCl2F3N2
6-Chloro-2-methoxy-3-nitropyridine 6-Chloro-2-methoxy-3-nitropyridine 40851-91-0 C6H5ClN2O3
4-Hydroxynicotinic acid 4-Hydroxynicotinic acid 609-70-1 C6H5NO3
5-ACETALDEHYDEYL-4,6-DICHLOROPYRIMIDINE 5-ACETALDEHYDEYL-4,6-DICHLOROPYRIMIDINE 16019-33-3 C6H4Cl2N2O
TETRAHYDROPYRAN-2-METHANOL TETRAHYDROPYRAN-2-METHANOL 100-72-1 C6H12O2
(4-CHLORO-PYRIDIN-2-YL)-METHANOL (4-CHLORO-PYRIDIN-2-YL)-METHANOL 63071-10-3 C6H6ClNO
5,6-Diamino-1,3-dimethyluracil hydrate 5,6-Diamino-1,3-dimethyluracil hydrate 5440-00-6 C6H10N4O2
4,6-dichloropyrimidine-5-carboxylic acid 4,6-dichloropyrimidine-5-carboxylic acid 87600-98-4 C5H2Cl2N2O2
2-Amino-3,5-difluoropyridine 2-Amino-3,5-difluoropyridine 732306-31-9 C5H4F2N2
4-(Boc-amino)pyridine 4-(Boc-amino)pyridine 98400-69-2 C10H14N2O2
2-Amino-4,5-dichloropyridine 2-Amino-4,5-dichloropyridine 188577-68-6 C5H4Cl2N2
2,4-Dichloropyrido[3,4-d]pyrimidine 2,4-Dichloropyrido[3,4-d]pyrimidine 908240-50-6 C7H3Cl2N3
METHYL 3-BROMOTHIOPHENE-2-CARBOXYLATE METHYL 3-BROMOTHIOPHENE-2-CARBOXYLATE 26137-08-6 C6H5BrO2S
2,6-DIBROMO-4-NITRO-PYRIDINE 2,6-DIBROMO-4-NITRO-PYRIDINE 175422-04-5 C5H2Br2N2O2
2-CYANOPYRIDINE-4-CARBOXALDEHYDE 2-CYANOPYRIDINE-4-CARBOXALDEHYDE 131747-70-1 C7H4N2O
6-HYDROXY-2,4,5-TRIAMINOPYRIMIDINE 6-HYDROXY-2,4,5-TRIAMINOPYRIMIDINE 1004-75-7 C4H7N5O
Isoquinolin-3-amine Isoquinolin-3-amine 25475-67-6 C9H8N2
8-METHOXY-2-METHYLQUINOLINE 8-METHOXY-2-METHYLQUINOLINE 3033-80-5 C11H11NO
2,6-Diamino-4-chloropyrimidine 1-oxide 2,6-Diamino-4-chloropyrimidine 1-oxide 35139-67-4 C4H5ClN4O
2-CHLORO-4-METHOXYNICOTINONITRILE 2-CHLORO-4-METHOXYNICOTINONITRILE 98645-43-3 C7H5ClN2O
3-CHLORO-2-METHOXYPYRIDINE 3-CHLORO-2-METHOXYPYRIDINE 13472-84-9 C6H6ClNO
2-CHLORO-3-METHYLPYRIDINE-5-BORONIC ACID 2-CHLORO-3-METHYLPYRIDINE-5-BORONIC ACID 1003043-40-0 C6H7BClNO2
4-Oxo-4H-1-benzopyran-2-carboxylic acid 4-Oxo-4H-1-benzopyran-2-carboxylic acid 4940-39-0 C10H6O4
Ethyl 2-Aminoisonicotinate Ethyl 2-Aminoisonicotinate 13362-30-6 C8H10N2O2
6-Iodouracil 6-Iodouracil 4269-94-7 C4H3IN2O2
2,6-DIAMINO-4-METHOXY PYRIMIDINE 2,6-DIAMINO-4-METHOXY PYRIMIDINE 3270-97-1 C5H8N4O
4-AMINO-2,6-DIHYDROXY-5-NITROSOPYRIMIDINE 4-AMINO-2,6-DIHYDROXY-5-NITROSOPYRIMIDINE 5442-24-0 C4H4N4O3
7-BENZYL-5,6,7,8-TETRAHYDRO-3H-PYRIDO[3,4-D]PYRIMIDIN-4-ONE HYDROCHLORIDE 7-BENZYL-5,6,7,8-TETRAHYDRO-3H-PYRIDO[3,4-D]PYRIMIDIN-4-ONE HYDROCHLORIDE 62458-96-2 C14H15N3O
3-(Bromomethyl)pyridine Hydrobromide 3-(Bromomethyl)pyridine Hydrobromide 4916-55-6 C6H6BrN.BrH
1-N-CBZ-3-HYDROXY-PIPERIDINE 1-N-CBZ-3-HYDROXY-PIPERIDINE 95798-22-4 C13H17NO3
4-AMINO-2-(ETHYLTHIO)-5-(HYDROXYMETHYL)PYRIMIDINE 4-AMINO-2-(ETHYLTHIO)-5-(HYDROXYMETHYL)PYRIMIDINE 98432-26-9 C7H11N3OS
2,3-PYRAZINEDIAMINE 2,3-PYRAZINEDIAMINE 13134-31-1 C4H6N4
2-BENZOYLTHIOPHENE 2-BENZOYLTHIOPHENE 135-00-2 C11H8OS
5-NITROTHIOPHENE-2-CARBONITRILE 5-NITROTHIOPHENE-2-CARBONITRILE 16689-02-4 C5H2N2O2S
4-FLUORO-7-AZAINDOLE 4-FLUORO-7-AZAINDOLE 640735-23-5 C7H5FN2
4-(2,4-DINITROBENZYL)PYRIDINE 4-(2,4-DINITROBENZYL)PYRIDINE 1603-85-6 C12H9N3O4
5-AMINO-2-NITROPYRIDINE 5-AMINO-2-NITROPYRIDINE 14916-65-5 C5H5N3O2
CARBOSTYRIL 124 CARBOSTYRIL 124 19840-99-4 C10H10N2O
2,6-Diiodopyridine 2,6-Diiodopyridine 53710-17-1 C5H3I2N
2-FORMYL-5-PICOLINE 2-FORMYL-5-PICOLINE 4985-92-6 C7H7NO
3,3'-Dihydroxybenzidine 3,3'-Dihydroxybenzidine 2373-98-0 C12H12N2O2
5-Isopropyl-2-pyrimidinamine 5-Isopropyl-2-pyrimidinamine 98432-17-8 C7H11N3
3-CHLORO-5-METHOXYPYRIDAZINE 3-CHLORO-5-METHOXYPYRIDAZINE 123696-02-6 C5H5ClN2O
3-BROMOISOQUINOLINE 3-BROMOISOQUINOLINE 34784-02-6 C9H6BrN
Isoquinoline-3-carboxylic acid Isoquinoline-3-carboxylic acid 6624-49-3 C10H7NO2
5-Chloro-2-hydroxynicotinic acid 5-Chloro-2-hydroxynicotinic acid 38076-80-1 C6H4ClNO3
2,2-DIMETHYLTETRAHYDROPYRAN-4-ONE 2,2-DIMETHYLTETRAHYDROPYRAN-4-ONE 1194-16-7 C7H12O2
2-HYDROXY-4-METHYLPYRIMIDINE 2-HYDROXY-4-METHYLPYRIMIDINE 15231-48-8 C5H6N2O
4-Chloro-2-(methylsulfonyl)pyrimidine 4-Chloro-2-(methylsulfonyl)pyrimidine 97229-11-3 C5H5ClN2O2S
N-BOC-3-HYDROXY-1,2,3,6-TETRAHYDROPYRIDINE N-BOC-3-HYDROXY-1,2,3,6-TETRAHYDROPYRIDINE 224779-27-5 C10H17NO3
3-Ethylthiophene 3-Ethylthiophene 1795-01-3 C6H8S
3-CHLORO-5-(TRIFLUOROMETHYL)PYRIDINE-2-THIOL 3-CHLORO-5-(TRIFLUOROMETHYL)PYRIDINE-2-THIOL 76041-74-2 C6H3ClF3NS
3-Bromo-7-(trifluoromethyl)imidazo[1,2-a]pyrimidine 3-Bromo-7-(trifluoromethyl)imidazo[1,2-a]pyrimidine 375857-65-1 C7H3BrF3N3
2-Phenylpiperazine 2-Phenylpiperazine 5271-26-1 C10H14N2
2,6-DICHLOROPYRIDINE-3-BORONIC ACID 2,6-DICHLOROPYRIDINE-3-BORONIC ACID 148493-34-9 C5H4BCl2NO2
METHYL 1-(6-CHLORO-3-PYRIDAZINYL)-4-PIPERIDINECARBOXYLATE METHYL 1-(6-CHLORO-3-PYRIDAZINYL)-4-PIPERIDINECARBOXYLATE 339276-34-5 C11H14ClN3O2
5-(Trifluoromethyl)picolinonitrile 5-(Trifluoromethyl)picolinonitrile 95727-86-9 C7H3F3N2
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