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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-AMINO-2-METHOXY-ISONICOTINIC ACID 5-AMINO-2-METHOXY-ISONICOTINIC ACID 183741-91-5 C7H8N2O3
Pyridine hydrofluoride Pyridine hydrofluoride 62778-11-4 C5H6FN
2,3-DIHYDRO-1H-PYRROLO[3,4-C]PYRIDINE 2,3-DIHYDRO-1H-PYRROLO[3,4-C]PYRIDINE 496-13-9 C7H8N2
Methyl 3-hydroxypyrazine-2-carboxylate Methyl 3-hydroxypyrazine-2-carboxylate 27825-20-3 C6H6N2O3
2-N-PROPYLTHIOPHENE 2-N-PROPYLTHIOPHENE 1551-27-5 C7H10S
2,6-DIMETHYL-NICOTINIC ACID 2,6-DIMETHYL-NICOTINIC ACID 5860-71-9 C8H9NO2
1-(3-METHYLPYRIDIN-2-YL)PIPERAZINE 1-(3-METHYLPYRIDIN-2-YL)PIPERAZINE 111960-11-3 C10H15N3
5-NITRO-2-HYDROXY-4-METHOXYPYRIDINE 5-NITRO-2-HYDROXY-4-METHOXYPYRIDINE 607373-82-0 C6H6N2O4
7-Hydroxy-6-methoxy-3,4-dihydroisoquinoline 7-Hydroxy-6-methoxy-3,4-dihydroisoquinoline 4602-73-7 C10H11NO2
N-BOC-4-(4-CARBOXYPHENYL) PIPERIDINE N-BOC-4-(4-CARBOXYPHENYL) PIPERIDINE 149353-75-3 C17H23NO4
1-Cyclopentylpiperazine 1-Cyclopentylpiperazine 21043-40-3 C9H18N2
4-CHLORO-3-IODOPYRIDINE 4-CHLORO-3-IODOPYRIDINE 89167-34-0 C5H3ClIN
2-CHLORO-5-NITRO-3-(TRIFLUOROMETHYL)PYRIDINE 2-CHLORO-5-NITRO-3-(TRIFLUOROMETHYL)PYRIDINE 99368-67-9 C6H2ClF3N2O2
ISOQUINOLINE-3-CARBOXYLIC ACID HYDRATE ISOQUINOLINE-3-CARBOXYLIC ACID HYDRATE 207399-25-5 C10H9NO3
2,8-DICHLOROQUINOLINE 2,8-DICHLOROQUINOLINE 4470-83-1 C9H5Cl2N
2,6-DIBROMO-3-HYDROXYPYRIDINE 2,6-DIBROMO-3-HYDROXYPYRIDINE 6602-33-1 C5H3Br2NO
1-PYRIDIN-2-YL-PROPAN-2-ONE 1-PYRIDIN-2-YL-PROPAN-2-ONE 6302-02-9 C8H9NO
3-CYANO-2-METHOXYPYRIDINE 3-CYANO-2-METHOXYPYRIDINE 7254-34-4 C7H6N2O
2-(BROMOACETYL)PYRIDINE HYDROBROMIDE 2-(BROMOACETYL)PYRIDINE HYDROBROMIDE 17570-98-8 C7H7Br2NO
2-METHYL-5-NITROPYRIDIN-3-AMINE 2-METHYL-5-NITROPYRIDIN-3-AMINE 51984-61-3 C6H7N3O2
3-Methylpyridine-4-sulfonic acid 3-Methylpyridine-4-sulfonic acid 14045-23-9 C6H7NO3S
N-(3-IODO-PYRIDIN-4-YL)-2,2-DIMETHYL-PROPIONAMIDE N-(3-IODO-PYRIDIN-4-YL)-2,2-DIMETHYL-PROPIONAMIDE 113975-33-0 C10H13IN2O
1,2,3,6-TETRAHYDROPYRIDINE 1,2,3,6-TETRAHYDROPYRIDINE 694-05-3 C5H9N
Piperazine-2-carboxylic acid Piperazine-2-carboxylic acid 2762-32-5 C5H10N2O2
2-BROMOPYRIMIDIN-5-AMINE 2-BROMOPYRIMIDIN-5-AMINE 56621-91-1 C4H4BrN3
3-CHLORO-6-PYRROL-1-YL-PYRIDAZINE 3-CHLORO-6-PYRROL-1-YL-PYRIDAZINE 5096-76-4 C8H6ClN3
4-(PYRIMIDIN-2-YLOXY)BENZALDEHYDE 4-(PYRIMIDIN-2-YLOXY)BENZALDEHYDE 433920-92-4 C11H8N2O2
S-(Trifluoromethyl)dibenzothiophenium trifluoromethanesulfonate S-(Trifluoromethyl)dibenzothiophenium trifluoromethanesulfonate 129946-88-9 C14H8F6O3S2
METHYL 2-AMINO-5-BROMO-4-PYRIDINECARBOXYLATE METHYL 2-AMINO-5-BROMO-4-PYRIDINECARBOXYLATE 882499-87-8 C7H7BrN2O2
2,4-DIAMINO-6-ETHOXYPYRIMIDINE 2,4-DIAMINO-6-ETHOXYPYRIMIDINE 116436-03-4 C6H10N4O
5-BROMO-4-METHOXYCARBONYL-2(1H)-PYRIDINONE 5-BROMO-4-METHOXYCARBONYL-2(1H)-PYRIDINONE 913836-17-6 C7H6BrNO3
N-octylpyridin-4-amine N-octylpyridin-4-amine 64690-19-3 C13H22N2
5-Chloro-N-tert-butyl-2-thiophenesulfonamide 5-Chloro-N-tert-butyl-2-thiophenesulfonamide 155731-14-9 C8H12ClNO2S2
5-Aminopyridine-2-carboxamide 5-Aminopyridine-2-carboxamide 145255-19-2 C6H7N3O
4-Amino-2-hydroxy-3-nitropyridine 4-Amino-2-hydroxy-3-nitropyridine 88511-57-3 C5H5N3O3
1,3-Dichloro-7-methylisoquinoline 1,3-Dichloro-7-methylisoquinoline 21902-37-4 C10H7Cl2N
5-Amino-1-chloroisoquinoline 5-Amino-1-chloroisoquinoline 374554-54-8 C9H7ClN2
1-(6-Pyridazinyl)piperazine 1-(6-Pyridazinyl)piperazine 51047-56-4 C8H12N4
4,6-Dihydroxynicotinic acid 4,6-Dihydroxynicotinic acid 5466-62-6 C6H5NO4
5-Chloropyridine-2-carboxylic acid methyl ester 5-Chloropyridine-2-carboxylic acid methyl ester 132308-19-1 C7H6ClNO2
2-Hydroxymethyl-3-methyl-4-(3-methoxy propanoxyl)pyridine 2-Hydroxymethyl-3-methyl-4-(3-methoxy propanoxyl)pyridine 118175-10-3 C11H17NO3
5-HYDROXY-PYRIDINE-2-CARBOXYLIC ACID METHYL ESTER 5-HYDROXY-PYRIDINE-2-CARBOXYLIC ACID METHYL ESTER 30766-12-2 C7H7NO3
2-Chloro-4,6-dimethyl-3-pyridinecarboxylic acid 2-Chloro-4,6-dimethyl-3-pyridinecarboxylic acid 66662-48-4 C8H8ClNO2
6-Mercapto-4(1H)-pyrimidinone 6-Mercapto-4(1H)-pyrimidinone 6311-83-7 C4H4N2OS
5-AMINO-3-PYRIDINECARBOXAMIDE 5-AMINO-3-PYRIDINECARBOXAMIDE 60524-14-3 C6H7N3O
3,5-Dichloro-4-Picoline 3,5-Dichloro-4-Picoline 100868-46-0 C6H5Cl2N
2-Bromo-6-Fluoro-4-Picoline 2-Bromo-6-Fluoro-4-Picoline 180608-37-1 C6H5BrFN
2-Ethylpyrimidine-5-carbaldehyde 2-Ethylpyrimidine-5-carbaldehyde 205518-89-4 C7H8N2O
6-chloropyridine-3,4-diamine hydrochloride 6-chloropyridine-3,4-diamine hydrochloride 2604-40-2 C5H7Cl2N3
2,4-DIBROMO-3-NITROPYRIDINE 2,4-DIBROMO-3-NITROPYRIDINE 121263-10-3 C5H2Br2N2O2
2-HYDROXY-3-AMINO-5-CHLOROPYRIDINE 2-HYDROXY-3-AMINO-5-CHLOROPYRIDINE 98027-36-2 C5H5ClN2O
2-Pyrimidinamine, 4-bromo- (9CI) 2-Pyrimidinamine, 4-bromo- (9CI) 343926-69-2 C4H4BrN3
METHYL 5-BROMO-6-HYDROXYNICOTINATE METHYL 5-BROMO-6-HYDROXYNICOTINATE 381247-99-0 C7H6BrNO3
2-CHLORO-5-FLUOROISONICOTINIC ACID 2-CHLORO-5-FLUOROISONICOTINIC ACID 884494-74-0 C6H3ClFNO2
1-N-HEXADECYL-4-METHYLPYRIDINIUM CHLORIDE HYDRATE 1-N-HEXADECYL-4-METHYLPYRIDINIUM CHLORIDE HYDRATE 13106-53-1 C22H42ClNO
5-CHLORO-6-METHYLURACIL 5-CHLORO-6-METHYLURACIL 16018-87-4 C5H5ClN2O2
4-METHOXY-2-QUINOLINECARBOXYLIC ACID 4-METHOXY-2-QUINOLINECARBOXYLIC ACID 15733-83-2 C11H9NO3
5-IODO-4-METHYL-PYRIDIN-2-YLAMINE 5-IODO-4-METHYL-PYRIDIN-2-YLAMINE 356561-08-5 C6H7IN2
5-BROMOPYRIDINE-2-CARBONYL CHLORIDE 5-BROMOPYRIDINE-2-CARBONYL CHLORIDE 137178-88-2 C6H3BrClNO
2-METHYL-3-N-PROPYLPYRAZINE 2-METHYL-3-N-PROPYLPYRAZINE 15986-80-8 C8H12N2
2-Ethoxy-3-pyridineboronic acid 2-Ethoxy-3-pyridineboronic acid 854373-97-0 C7H10BNO3
4-(3-Phenylpropyl)pyridine 4-(3-Phenylpropyl)pyridine 2057-49-0 C14H15N
4,4'-Dinonyl-2,2'-bipyridine 4,4'-Dinonyl-2,2'-bipyridine 142646-58-0 C28H44N2
2,5-DIAMINO-3-PICOLINE, 2,5-DIAMINO-3-PICOLINE, 106070-58-0 C6H9N3
DIETHYL 3 4-PYRIDINEDICARBOXYLATE  97 DIETHYL 3 4-PYRIDINEDICARBOXYLATE 97 1678-52-0 C11H13NO4
1-(CYCLOPROPANECARBONYL)PIPERAZINE  97 1-(CYCLOPROPANECARBONYL)PIPERAZINE 97 59878-57-8 C8H14N2O
2-Mercapto-6-(trifluoromethyl)pyridine 2-Mercapto-6-(trifluoromethyl)pyridine 121307-80-0 C6H4F3NS
2-NITRO-5-METHYLPYRIDINE 2-NITRO-5-METHYLPYRIDINE 1074-38-0 C6H6N2O2
4-Pyridineethanesulfonic acid 4-Pyridineethanesulfonic acid 53054-76-5 C7H9NO3S
2-AMINO-3-BROMO-4-METHYLPYRIDINE 2-AMINO-3-BROMO-4-METHYLPYRIDINE 40073-38-9 C6H7BrN2
N-FLUORO-4,6-DIMETHYLPYRIDINIUM-2-SULFONATE N-FLUORO-4,6-DIMETHYLPYRIDINIUM-2-SULFONATE 147541-01-3 C7H8FNO3S
2-(2-NITROETHOXY)TETRAHYDROPYRAN 2-(2-NITROETHOXY)TETRAHYDROPYRAN 75233-61-3 C7H13NO4
4-METHOXYPYRIDINE-2-CARBOXYLIC ACID 4-METHOXYPYRIDINE-2-CARBOXYLIC ACID 29082-91-5 C7H7NO3
3-AMINOPYRAZINE-2-CARBONITRILE 3-AMINOPYRAZINE-2-CARBONITRILE 25911-65-3 C5H4N4
4-Amino-6-bromoquinoline 4-Amino-6-bromoquinoline 65340-73-0 C9H7BrN2
3-Hydroxy-4-(trifluoromethyl)pyridine 3-Hydroxy-4-(trifluoromethyl)pyridine 936841-71-3 C6H4F3NO
5-Chloro-3,4-diaminopyridine 5-Chloro-3,4-diaminopyridine 929074-42-0 C5H6ClN3
6-Chloro-pyridazine-3-carboxylic acid ethyl ester 6-Chloro-pyridazine-3-carboxylic acid ethyl ester 75680-92-1 C7H7ClN2O2
Isoquinolin-4-ol Isoquinolin-4-ol 3336-49-0 C9H7NO
6-Amino-3-methyluracil 6-Amino-3-methyluracil 21236-97-5 C5H7N3O2
2-tert-Butyl-5-bromopyrimidine 2-tert-Butyl-5-bromopyrimidine 85929-94-8 C8H11BrN2
5-Bromo-2-chloro-3-cyanopyridine 5-Bromo-2-chloro-3-cyanopyridine 405224-23-9 C6H2BrClN2
5-Bromo-4-butylpyrimidine 5-Bromo-4-butylpyrimidine 4595-64-6 C8H11BrN2
5-BROMO-4-METHYL-PYRIDINE-2,3-DIAMINE 5-BROMO-4-METHYL-PYRIDINE-2,3-DIAMINE 41230-93-7 C6H8BrN3
1,6-Naphthyridin-2(1H)-one,5,6,7,8-tetrahydro-(9CI) 1,6-Naphthyridin-2(1H)-one,5,6,7,8-tetrahydro-(9CI) 676994-64-2 C8H10N2O
METHYL 3-FORMYLINDOLE-6-CARBOXYLATE METHYL 3-FORMYLINDOLE-6-CARBOXYLATE 387350-58-5 C13H12N2O5
2-HYDROXYPYRIMIDINE-5-CARBOXYLIC ACID 2-HYDROXYPYRIMIDINE-5-CARBOXYLIC ACID 38324-83-3 C5H4N2O3
2-(Methoxycarbonyl)-4-pyridineboronic acid, pinacol ester 2-(Methoxycarbonyl)-4-pyridineboronic acid, pinacol ester 957062-72-5 C13H18BNO4
5-CHLORO-2-FLUORO-4-IODOPYRIDINE 5-CHLORO-2-FLUORO-4-IODOPYRIDINE 659731-48-3 C5H2ClFIN
2-CHLORO-5-FLUORO-4-IODOPYRIDINE 2-CHLORO-5-FLUORO-4-IODOPYRIDINE 884494-49-9 C5H2ClFIN
2,6-Dimethyl-3,5-dibromopyridine 2,6-Dimethyl-3,5-dibromopyridine 3430-34-0 C7H7Br2N
5,7-dichlorothiazolo[5,4-d]pyrimidine 5,7-dichlorothiazolo[5,4-d]pyrimidine 13479-88-4 C5HCl2N3S
2,3-DIBROMO-5-(TRIFLUOROMETHYL)PYRIDINE 2,3-DIBROMO-5-(TRIFLUOROMETHYL)PYRIDINE 79623-38-4 C6H2Br2F3N
2-(TRIFLUOROMETHYL)-3-PYRIDINECARBOXYLIC ACID ETHYL ESTER 2-(TRIFLUOROMETHYL)-3-PYRIDINECARBOXYLIC ACID ETHYL ESTER 208517-35-5 C9H8F3NO2
3-Bromo-2-pyridinecarboxaldehyde 3-Bromo-2-pyridinecarboxaldehyde 405174-97-2 C6H4BrNO
5-Bromo-2,4-dichloropyridine 5-Bromo-2,4-dichloropyridine 849937-96-8 C5H2BrCl2N
2-CYANO-4-PYRIDINE CARBOXYLIC ACID METHYL ESTER 2-CYANO-4-PYRIDINE CARBOXYLIC ACID METHYL ESTER 94413-64-6 C8H6N2O2
3-broMo-5,7-dichloropyrazolo(1,5-a)pyriMidine 3-broMo-5,7-dichloropyrazolo(1,5-a)pyriMidine 114040-06-1 C6H2BrCl2N3
2-CYANOPYRIDINE-4-BORONIC ACID PINACOL ESTER 2-CYANOPYRIDINE-4-BORONIC ACID PINACOL ESTER 741709-62-6 C12H15BN2O2
Poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) Poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) 155090-83-8 (C8H8O3S)x?x(C6H6O2S)x
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