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-CYANO-7-ETHOXYCOUMARIN 3-CYANO-7-ETHOXYCOUMARIN 117620-77-6 C12H9NO3
2-CHLORO-4-METHYLPYRIMIDINE-5-CARBOXYLIC ACID 2-CHLORO-4-METHYLPYRIMIDINE-5-CARBOXYLIC ACID C6H5ClN2O2
6-BROMOPYRIDINE-2-ETHYL FORMATE 6-BROMOPYRIDINE-2-ETHYL FORMATE
2-METHOXY-5-NITROPYRIMIDIN-4-AMINE 2-METHOXY-5-NITROPYRIMIDIN-4-AMINE C5H6N4O3
NICOTINAMIDE HYDROIODIDE NICOTINAMIDE HYDROIODIDE 3726-23-6 C6H7IN2O
3-NITROPYRAZOLO[1,5-A]PYRIMIDINE 3-NITROPYRAZOLO[1,5-A]PYRIMIDINE 55405-64-6 C6H4N4O2
2-(2-BROMOETHOXY)TETRAHYDRO-2H-PYRAN 2-(2-BROMOETHOXY)TETRAHYDRO-2H-PYRAN 172797-67-0 C7H13BrO2
SULFAMERAZIN-D4 SULFAMERAZIN-D4 1020719-84-9 C11H12N4O2S
3-(METHYLTHIO)THIOPHENE 3-(METHYLTHIO)THIOPHENE 20731-74-2 C5H6S2
6-METHYL-PYRIDINE-2,5-DIAMINE 6-METHYL-PYRIDINE-2,5-DIAMINE C6H9N3
2-ACETYLAMINO-3-BROMO-5-METHYLPYRIDINE& 2-ACETYLAMINO-3-BROMO-5-METHYLPYRIDINE& 142404-83-9 C8H9BrN2O
2,4-DIETHOXY-5-FLUOROPYRIMIDINE 2,4-DIETHOXY-5-FLUOROPYRIMIDINE 155-36-2 C8H11FN2O2
4-BROMOMETHYL-2-METHYLTHIOPYRIMIDINE 4-BROMOMETHYL-2-METHYLTHIOPYRIMIDINE 135645-63-5 C6H7BrN2S
4-HYDROXY-2-METHYLQUINOLINE 4-HYDROXY-2-METHYLQUINOLINE 5660-24-2 C10H9NO
7-DIETHYLAMINO-3-THENOYLCOUMARIN 7-DIETHYLAMINO-3-THENOYLCOUMARIN 77820-11-2 C18H17NO3S
N-HEXYLPYRIDINIUM TRIFLUOROMETHANESULFONATE N-HEXYLPYRIDINIUM TRIFLUOROMETHANESULFONATE 623167-81-7 C12H18F3NO3S
2-chloro-3-nitro-6-hydroxypyridine 2-chloro-3-nitro-6-hydroxypyridine 198268-98-3 C5H3ClN2O3
4-Iodobenzothiophene 4-Iodobenzothiophene C8H5IS
2,3-DIHYDROXYPYRIDINE 2,3-DIHYDROXYPYRIDINE 84719-32-4 C5H5NO2
2-(2,2-Dimethylpropyl)thiophene 2-(2,2-Dimethylpropyl)thiophene 4891-29-6 C9H14S
1H-PYRROLO[2,3-D]PYRIDAZINE 1H-PYRROLO[2,3-D]PYRIDAZINE 271-35-2 C6H5N3
4-BROMO-7H-PYRROLO [2,3-D]PYRIMIDIN-2-YLAMINE 4-BROMO-7H-PYRROLO [2,3-D]PYRIMIDIN-2-YLAMINE 848694-32-6 C6H5BrN4
Pyridine, 2-fluoro-5-iodo-4-methyl- Pyridine, 2-fluoro-5-iodo-4-methyl- C6H5FIN
METHYL ISOQUINOLINE-8-CARBOXYLATE METHYL ISOQUINOLINE-8-CARBOXYLATE 850858-56-9 C11H9NO2
(2-AMINO-4-PYRIDYL)BORONIC ACID (2-AMINO-4-PYRIDYL)BORONIC ACID 903513-62-2 C5H7BN2O2
5-BROMO-4-IODOPYRIDINE-3-CARBOXYLIC ACID 5-BROMO-4-IODOPYRIDINE-3-CARBOXYLIC ACID 491588-98-8 C6H3BrINO2
(4-CHLORO-2-METHYLSULFANYL-PYRIMIDIN-5-YL)-METHANOL (4-CHLORO-2-METHYLSULFANYL-PYRIMIDIN-5-YL)-METHANOL 1044145-59-6 C6H7ClN2OS
1,3-DIMETHYL-PIPERAZINE 1,3-DIMETHYL-PIPERAZINE 22317-01-7 C6H14N2
(6-amino-pyridin-3-ylmethyl)-carbamic acid tert-butyl ester (6-amino-pyridin-3-ylmethyl)-carbamic acid tert-butyl ester 400720-77-6 C11H17N3O2
2-Methyl-5-bromopyrimidine 2-Methyl-5-bromopyrimidine C5H5BrN2
4-trifluoromethyl-2-methylthio-pyrimidine 4-trifluoromethyl-2-methylthio-pyrimidine 136547-20-1 C6H5F3N2S
2-Chloropyridine-3-sulfonyl  chloride 2-Chloropyridine-3-sulfonyl chloride 70682-09-6 C6H6ClNO2S
4-Bromopyridin-2(1H)-One 4-Bromopyridin-2(1H)-One 947407-84-3 C5H6BrNO
4,6-Dichloropyrido[3,2-d]pyrimidine 4,6-Dichloropyrido[3,2-d]pyrimidine 175358-02-8 C7H3Cl2N3
N-(n-butoxycarbonyl)piperazine N-(n-butoxycarbonyl)piperazine 50606-32-1 C9H18N2O2
3-amino-4-bromo-2,6-dichloropyridine 3-amino-4-bromo-2,6-dichloropyridine 1121586-37-5 C5H3BrCl2N2
[1-(6-Chloropyridazin-3-yl)piperidin-4-yl]methanol [1-(6-Chloropyridazin-3-yl)piperidin-4-yl]methanol 1094223-48-9 C10H14ClN3O
5-bromo-1-(pyrimidin-2-yl)-1H-pyrazole-4-carbonitrile 5-bromo-1-(pyrimidin-2-yl)-1H-pyrazole-4-carbonitrile 1269291-98-6 C8H4BrN5
5-fluoro-1-(pyrimidin-2-yl)-1H-pyrazole-4-carbonitrile 5-fluoro-1-(pyrimidin-2-yl)-1H-pyrazole-4-carbonitrile 1269291-01-1 C8H4FN5
5-Iodo-2-(phenylmethyl)-3(2H)-pyridazinone 5-Iodo-2-(phenylmethyl)-3(2H)-pyridazinone 825633-93-0 C11H9IN2O
N-(1-(5-fluoropyridin-2-yl)vinyl)acetamide N-(1-(5-fluoropyridin-2-yl)vinyl)acetamide 905587-18-0 C9H9FN2O
6-Chloro-N-methyl-N-(phenylmethyl)- 3-Pyridazinamine 6-Chloro-N-methyl-N-(phenylmethyl)- 3-Pyridazinamine 141193-20-6 C12H12ClN3
3,5-difluoro-4-methoxypyridine 3,5-difluoro-4-methoxypyridine 1186195-24-3 C6H5F2NO
4-(2-chloro-5-fluoro-pyrimidin-4-yl)-morpholine 4-(2-chloro-5-fluoro-pyrimidin-4-yl)-morpholine 31646-53-4 C8H9ClFN3O
(2-Chloro-pyrimidin-4-yl)-cyclopropyl-amine (2-Chloro-pyrimidin-4-yl)-cyclopropyl-amine 945895-52-3 C7H8ClN3
(4-Chloro-6-methyl-pyrimidin-2-yl)-cyclopropyl-amine (4-Chloro-6-methyl-pyrimidin-2-yl)-cyclopropyl-amine 5734-73-6 C8H10ClN3
4-(5-Nitro-pyridin-2-yloxy)-piperidine-1-carboxylic acid tert-butyl ester 4-(5-Nitro-pyridin-2-yloxy)-piperidine-1-carboxylic acid tert-butyl ester 346665-40-5 C15H21N3O5
Cyclopropyl-(2,4-dichloro-pyrimidin-5-ylmethyl)-amine Cyclopropyl-(2,4-dichloro-pyrimidin-5-ylmethyl)-amine 1289388-21-1 C8H9Cl2N3
2,4-Dichloro-6-ethoxymethyl-pyrimidine 2,4-Dichloro-6-ethoxymethyl-pyrimidine 1289385-14-3 C7H8Cl2N2O
Ethyl 4-Ethoxy-2-oxo-1,2-dihydropyridine-3-carboxylate Ethyl 4-Ethoxy-2-oxo-1,2-dihydropyridine-3-carboxylate 1174046-84-4 C10H13NO4
4-Methyl-2-(methylthio)-5-pyrimidinecarbonitrile 4-Methyl-2-(methylthio)-5-pyrimidinecarbonitrile 89079-62-9 C7H7N3S
dibenzo[b,d]thiophen-3-aMine dibenzo[b,d]thiophen-3-aMine 25288-76-0 C12H9NS
2,5-diMethoxy-4(3H)-PyriMidinone 2,5-diMethoxy-4(3H)-PyriMidinone 370103-23-4 C6H8N2O3
1-(2-Methoxyethyl)-4-oxo-1,4-dihydropyrido[1,2-a]pyrrolo[2,3-d]pyriMidine-2-carboxylic acid Monohydrate, 96% 1-(2-Methoxyethyl)-4-oxo-1,4-dihydropyrido[1,2-a]pyrrolo[2,3-d]pyriMidine-2-carboxylic acid Monohydrate, 96% C14H15N3O5
Pyrrolo[1,2-a]pyrimidine-6-carboxaldehyde (9CI) Pyrrolo[1,2-a]pyrimidine-6-carboxaldehyde (9CI) 61900-76-3 C8H6N2O
2-Pyridinamine, 3,4,5,6-tetrachloro- 2-Pyridinamine, 3,4,5,6-tetrachloro- 51501-52-1 C5H2Cl4N2
2-Pyridinecarboxylicacid,5-cyano-,methylester(9CI) 2-Pyridinecarboxylicacid,5-cyano-,methylester(9CI) 76196-66-2 C8H6N2O2
6-Isoquinolinamine,5-chloro-(9CI) 6-Isoquinolinamine,5-chloro-(9CI) 566943-99-5 C9H7ClN2
5-Pyrimidinecarboxylicacid,2-ethyl-(9CI) 5-Pyrimidinecarboxylicacid,2-ethyl-(9CI) 72790-16-0 C7H8N2O2
Pyridine,3,4-bis(chloromethyl)-(9CI) Pyridine,3,4-bis(chloromethyl)-(9CI) 38070-81-4 C7H7Cl2N
5-Pyrimidinecarboxylicacid,4-methyl-,methylester(9CI) 5-Pyrimidinecarboxylicacid,4-methyl-,methylester(9CI) 157335-94-9 C7H8N2O2
4-Pyridinecarboxamide,N-ethyl-(9CI) 4-Pyridinecarboxamide,N-ethyl-(9CI) 41116-48-7 C8H10N2O
Ethyl-2-(2,6-dichlor-5-fluorpyridin-3-carbonyl)-3-(2,4-difluorphenylamino)-acrylat Ethyl-2-(2,6-dichlor-5-fluorpyridin-3-carbonyl)-3-(2,4-difluorphenylamino)-acrylat 100490-99-1 C17H11Cl2F3N2O3
4-Acetamidopyridine,N-(4-PYRIDYL)ACETAMIDE 4-Acetamidopyridine,N-(4-PYRIDYL)ACETAMIDE C14H16N4O2
2-fluoro-3,5-dibromo-4-methylpyridine 2-fluoro-3,5-dibromo-4-methylpyridine 1000340-01-1
6-CHLORO-IMIDAZO[1,2-B]PYRIDAZINE-3-METHANOL 6-CHLORO-IMIDAZO[1,2-B]PYRIDAZINE-3-METHANOL 675580-49-1 C7H6ClN3O
2-Isobutylthiophene 2-Isobutylthiophene 32741-05-2 C8H12S
2-HEXANOYLTHIOPHENE 2-HEXANOYLTHIOPHENE 26447-67-6 C10H14OS
4,6-dimethoxypyrimidin-5-amine 4,6-dimethoxypyrimidin-5-amine C6H9N3O2
2-(5-chloropyridin-2-yl)acetic acid 2-(5-chloropyridin-2-yl)acetic acid 1000522-43-9 C7H6ClNO2
2,4-Dibenzyloxypyrimidine-5-boronic acid neopentyl glycol ester 2,4-Dibenzyloxypyrimidine-5-boronic acid neopentyl glycol ester 1072944-91-2 C23H27BN2O5
6-Bromo-2,4-dimethyl-3-iodopyridine 6-Bromo-2,4-dimethyl-3-iodopyridine C7H7BrIN
(2-phenylethyl)(pyridin-2-ylmethyl)amine (2-phenylethyl)(pyridin-2-ylmethyl)amine 418776-49-5 C14H16N2
[(6-chloropyridin-3-yl)methyl]dimethylamine [(6-chloropyridin-3-yl)methyl]dimethylamine 221146-31-2 C8H11ClN2
5-CYANOPYRIDINE-3-CARBOXYLIC ACID ETHYL ESTER 5-CYANOPYRIDINE-3-CARBOXYLIC ACID ETHYL ESTER 90417-31-5 C9H8N2O2
(5-CYANOPYRIDIN-3-YL)-METHANOL (5-CYANOPYRIDIN-3-YL)-METHANOL 135124-71-9 C7H6N2O
2-chloro-N-(2-ethylphenyl)pyridine-4-carboxamide 2-chloro-N-(2-ethylphenyl)pyridine-4-carboxamide 1019323-34-2 C14H13ClN2O
N-benzyl-2-chloropyridine-4-carboxamide N-benzyl-2-chloropyridine-4-carboxamide 132222-38-9 C13H11ClN2O
3,4-Dibromothiophene-2,5-dicarboxaldehyde 3,4-Dibromothiophene-2,5-dicarboxaldehyde 25373-20-0 C6H2Br2O2S
3-Pyridinemethanol, 4-(4-fluoro-2-hydroxyphenyl)-a-methyl-2,6-bis(1-methylethyl)-5-propyl-, (aR,4R)-rel- (9CI) 3-Pyridinemethanol, 4-(4-fluoro-2-hydroxyphenyl)-a-methyl-2,6-bis(1-methylethyl)-5-propyl-, (aR,4R)-rel- (9CI) 202917-17-7 C22H30FNO2
1H-Pyrrolo[2,3-b]pyridine, 6-chloro-1-[tris(1-methylethyl)silyl]- 1H-Pyrrolo[2,3-b]pyridine, 6-chloro-1-[tris(1-methylethyl)silyl]- 956407-32-2 C16H25ClN2Si
2-amino-3-nitro-6-bromopyridine 2-amino-3-nitro-6-bromopyridine C5H4BrN3O2
2,6-Dichloronicotinoyl  chloride 2,6-Dichloronicotinoyl chloride 58584-83-1 C6H2Cl3NO
4,5-Dimethylpyridazine-3,6-diol 4,5-Dimethylpyridazine-3,6-diol 73428-45-2 C6H8N2O2
3,5-DIFLUOROPYRIDINE-2-CARBOXAMIDE 3,5-DIFLUOROPYRIDINE-2-CARBOXAMIDE C6H4F2N2O
3-chloro-6-isopropylpyridazine 3-chloro-6-isopropylpyridazine 570416-35-2 C7H9ClN2
Cyclopropyl-(5-fluoro-pyrimidin-2-yl)-amine Cyclopropyl-(5-fluoro-pyrimidin-2-yl)-amine 1289387-32-1 C7H8FN3
3-Bromo-6-chloropicolinonitrile, 97% 3-Bromo-6-chloropicolinonitrile, 97% 1053659-39-4 C6H2BrClN2
tert-Butyl 4-(methylthio)-3-iodopyridin-2-ylcarbamate tert-Butyl 4-(methylthio)-3-iodopyridin-2-ylcarbamate 1211504-19-6 C11H15IN2O2S
5-Chloro-2-(2-pyrrolidinyl)pyrimidine 5-Chloro-2-(2-pyrrolidinyl)pyrimidine 944901-10-4 C8H10ClN3
52200-48-3 52200-48-3 52200-48-3
3-Chlor-2-(2-Chlor-5-AMino-Phenoxy)-5-(TrifluoroMethyl)-Pyridine 3-Chlor-2-(2-Chlor-5-AMino-Phenoxy)-5-(TrifluoroMethyl)-Pyridine 87170-48-7 C12H7Cl2F3N2O
3-(MethylaMino)pyridazine-4-carbonitrile 3-(MethylaMino)pyridazine-4-carbonitrile 1256268-95-7 C6H6N4
1-(6-Chloro-pyridazin-3-yl)-piperidin-4-ylaMine hydrochloride, 98+% C9H14Cl2N4, MW: 249.14 1-(6-Chloro-pyridazin-3-yl)-piperidin-4-ylaMine hydrochloride, 98+% C9H14Cl2N4, MW: 249.14 1185310-92-2 C9H14Cl2N4
3-chloro-6-(4-chloropiperidin-1-yl)pyridazine, 98+% C9H11Cl2N3, MW: 232.11 3-chloro-6-(4-chloropiperidin-1-yl)pyridazine, 98+% C9H11Cl2N3, MW: 232.11 1185318-06-2 C9H11Cl2N3
2-broMopyridine-3-sulfonyl chloride 2-broMopyridine-3-sulfonyl chloride 1060811-59-7 C5H3BrClNO2S
4-(pyridin-3-yl)pyriMidin-2-ol 4-(pyridin-3-yl)pyriMidin-2-ol C9H7N3O
6-(broMoMethyl)pyriMidin-4-ol 6-(broMoMethyl)pyriMidin-4-ol 1269291-22-6 C5H5BrN2O
3-chloro-4-iodo-6-fluoropyridine 3-chloro-4-iodo-6-fluoropyridine C5H2ClFIN
N-Benzyl-1-[6-(2,4-difluorophenyl)-2-pyridyl]MethanaMine N-Benzyl-1-[6-(2,4-difluorophenyl)-2-pyridyl]MethanaMine 887985-29-7 C19H16F2N2
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