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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
1H-Isoindol-1-one, 5,6-diaMino-2,3-dihydro- 1H-Isoindol-1-one, 5,6-diaMino-2,3-dihydro- 1188412-94-3 C8H9N3O
1H-Pyrrolo[3,2-c]pyridine, 4-chloro-6-Methyl- 1H-Pyrrolo[3,2-c]pyridine, 4-chloro-6-Methyl- 178268-92-3 C8H7ClN2
1-Acetyl-3-broMo-4-chloroindole 1-Acetyl-3-broMo-4-chloroindole 1375064-70-2 C10H7BrClNO
6-Chloro-1H-indole-5-carboxylic acid methyl ester 6-Chloro-1H-indole-5-carboxylic acid methyl ester 162100-83-6 C10H8ClNO2
Methyl 1-acetyl-2-oxoindoline-6-carboxylate Methyl 1-acetyl-2-oxoindoline-6-carboxylate 676326-36-6 C12H11NO4
5,6-DiMethoxyindoline 5,6-DiMethoxyindoline 15937-07-2 C10H13NO2
2-methyl-3-(phenylmethyl)-1H-indole 2-methyl-3-(phenylmethyl)-1H-indole 19006-14-5 C16H15N
1-Boc-1H-pyrrolo[3,2-c]pyridine 1-Boc-1H-pyrrolo[3,2-c]pyridine 148760-75-2 C12H14N2O2
6-Aminoindole 6-Aminoindole 5318-27-4 C8H8N2
1H-INDOLE-3-ACETIC ACID, 4-BROMO-A-OXO-, METHYL ESTER 1H-INDOLE-3-ACETIC ACID, 4-BROMO-A-OXO-, METHYL ESTER 425640-16-0 C11H8BrNO3
7,8,9,10-tetrahydrocyclohepta[b]indol-6(5H)-one 7,8,9,10-tetrahydrocyclohepta[b]indol-6(5H)-one 7257-25-2 C13H13NO
3-FORMYL-1H-INDOLE-4-CARBOXYLIC ACID METHYL ESTER 3-FORMYL-1H-INDOLE-4-CARBOXYLIC ACID METHYL ESTER C11H9NO3
Indoline-3-carboxylic acid Indoline-3-carboxylic acid 39891-70-8 C9H9NO2
1-ACETYL-5-BROMO-3-HYDROXYINDOLE 1-ACETYL-5-BROMO-3-HYDROXYINDOLE 114165-30-9 C10H8BrNO2
bromfenac sodiumImpurity 7 bromfenac sodiumImpurity 7 91714-48-6 C15H10ClNO
Methyl 6-cyano-1H-indole-3-carboxylate Methyl 6-cyano-1H-indole-3-carboxylate 1357147-38-6 C11H8N2O2
1-VINYL-1,2,4-TRIAZOLE 1-VINYL-1,2,4-TRIAZOLE 2764-83-2 C4H5N3
2,3-DIMETHYL-1H-INDOLE-5-CARBOXYLIC ACID 2,3-DIMETHYL-1H-INDOLE-5-CARBOXYLIC ACID 14844-73-6 C11H11NO2
5-Phenyl-5,7-dihydroindolo[2,3-b]carbazole 5-Phenyl-5,7-dihydroindolo[2,3-b]carbazole 1448296-00-1 C24H16N2
1-Ethyl-2,3-dihydro-1H-indole-6-carbonitrile hydrochloride 1-Ethyl-2,3-dihydro-1H-indole-6-carbonitrile hydrochloride 1187928-73-9 C11H13ClN2
6-chloro-5-methoxy-3-methyl-1H-indole 6-chloro-5-methoxy-3-methyl-1H-indole 172170-01-3 C10H10ClNO
1H-Indole-3-carbonitrile, 2-amino-5-bromo- 1H-Indole-3-carbonitrile, 2-amino-5-bromo- 1242140-64-2 C9H6BrN3
5,6-Methylenedioxyindole 5,6-Methylenedioxyindole 267-48-1 C9H7NO2
(S)-(+)-4-(1H-INDOL-3-YLMETHYL)-2-OXAZOLINONE (S)-(+)-4-(1H-INDOL-3-YLMETHYL)-2-OXAZOLINONE 152153-01-0 C12H12N2O2
2,3-DIHYDRO-1H-PYRROLO[2,3-B]PYRIDINE 2,3-DIHYDRO-1H-PYRROLO[2,3-B]PYRIDINE 10592-27-5 C7H8N2
4-METHYLINDOLE-3-CARBOXALDEHYDE 4-METHYLINDOLE-3-CARBOXALDEHYDE 4771-48-6 C10H9NO
4-Bromoindoline 4-Bromoindoline 86626-38-2 C8H8BrN
5-Fluoro-2,3-dimethyl-1H-indole 5-Fluoro-2,3-dimethyl-1H-indole 526-47-6 C10H10FN
4-AMINOISOINDOLIN-1-ONE 4-AMINOISOINDOLIN-1-ONE 366452-98-4 C8H8N2O
5-METHYLINDOLE-3-CARBOXALDEHYDE 5-METHYLINDOLE-3-CARBOXALDEHYDE 52562-50-2 C10H9NO
9H-Pyrido[2,3-b]indole, 3-bromo- 9H-Pyrido[2,3-b]indole, 3-bromo- 1428799-40-9 C11H7BrN2
METHYL 3-INDOLYLACETATE METHYL 3-INDOLYLACETATE 1912-33-0 C11H11NO2
6-BROMO-7-FLUORO-1H-INDOLE-2-CARBOXYLIC ACID 6-BROMO-7-FLUORO-1H-INDOLE-2-CARBOXYLIC ACID 1388076-26-3 C9H5BrFNO2
N-ACETYLOXINDOLE  97 N-ACETYLOXINDOLE 97 21905-78-2 C10H9NO2
2,6-Piperidinedione, 3-[4-(aminomethyl)-1,3-dihydro-1-oxo-2H-isoindol-2-yl]- 2,6-Piperidinedione, 3-[4-(aminomethyl)-1,3-dihydro-1-oxo-2H-isoindol-2-yl]- 790652-68-5 C14H15N3O3
3-(4-(aminomethyl)-1-oxoisoindolin-2-yl)piperidine-2,6-dione hydrochloride 3-(4-(aminomethyl)-1-oxoisoindolin-2-yl)piperidine-2,6-dione hydrochloride 444289-05-8 C14H16ClN3O3
Benzeneacetic acid, 4-(1,3-dihydro-1,3-dioxo-2H-isoindol-2-yl)-α-ethyl-, ethyl ester Benzeneacetic acid, 4-(1,3-dihydro-1,3-dioxo-2H-isoindol-2-yl)-α-ethyl-, ethyl ester 36691-07-3 C20H19NO4
4-fluoro-7-methyl-1H-indole-2-carboxylic acid 4-fluoro-7-methyl-1H-indole-2-carboxylic acid 891724-25-7 C10H8FNO2
4-AMINO-6-CHLORO INDOLE 4-AMINO-6-CHLORO INDOLE 431046-15-0 C8H7ClN2
7-INDOLINECARBOXALDEHYDE 7-INDOLINECARBOXALDEHYDE 143262-21-9 C9H9NO
4-BROMO-3-CYANOINDOLE 4-BROMO-3-CYANOINDOLE 903131-13-5 C9H5BrN2
5-Nitro-1H-indole-3-carbaldehyde 5-Nitro-1H-indole-3-carbaldehyde 6625-96-3 C9H6N2O3
2,3-DIHYDRO-1H-INDOLE-6-CARBONITRILE HYDROCHLORIDE 2,3-DIHYDRO-1H-INDOLE-6-CARBONITRILE HYDROCHLORIDE 15861-35-5 C9H8N2
1H-Benz[e]indole, 2-ethyl-1,1-dimethyl- 1H-Benz[e]indole, 2-ethyl-1,1-dimethyl- 1092836-79-7 C16H17N
Benzeneacetonitrile, α-ethyl-4-nitro- Benzeneacetonitrile, α-ethyl-4-nitro- 94814-82-1 C10H10N2O2
1H-Indole, 5-bromo-2,3-dihydro-3-methyl- 1H-Indole, 5-bromo-2,3-dihydro-3-methyl- 86626-42-8 C9H10BrN
1H-Indole-3-carbonitrile, 4,6-difluoro- 1H-Indole-3-carbonitrile, 4,6-difluoro- 1360902-73-3 C9H4F2N2
1, 3-dimethyl-2-oxo-3-((phenylsulfonyl)methyl)indoline-5-carbonitrile 1, 3-dimethyl-2-oxo-3-((phenylsulfonyl)methyl)indoline-5-carbonitrile 1588429-82-6 C18H16N2O3S
4-Bromo-7-methoxy-5-azaindole 4-Bromo-7-methoxy-5-azaindole
1,2-dihydroxyindole 1,2-dihydroxyindole
6-Hydroxyindolin-2-one 6-Hydroxyindolin-2-one 6855-48-7 C8H7NO2
ICG-azide,ICG-N3 ICG-azide,ICG-N3
3-Bromoindole 3-Bromoindole 1484-27-1 C8H6BrN
7-BROMO-5-NITROINDOLINE
7-BROMO-5-NITROINDOLINE 87240-06-0 C8H7BrN2O2
1-Methyl-1H-indole-6-carbaldehyde 1-Methyl-1H-indole-6-carbaldehyde 21005-45-8 C10H9NO
6-Fluoro-3-hydroxy-N-acetylindole 6-Fluoro-3-hydroxy-N-acetylindole
Benzeneacetamide, α-ethyl-4-nitro- Benzeneacetamide, α-ethyl-4-nitro- 858006-96-9 C10H12N2O3
2-[4-(1,3-dihydro-1,3-dioxo-2H-isoindol-2-yl)phenyl]butyric acid 2-[4-(1,3-dihydro-1,3-dioxo-2H-isoindol-2-yl)phenyl]butyric acid 94232-67-4 C18H15NO4
methyl 1-(4-chlorobenzoyl)-5-methoxy-2-methyl-1H-indole-3-acetate methyl 1-(4-chlorobenzoyl)-5-methoxy-2-methyl-1H-indole-3-acetate 1601-18-9 C20H18ClNO4
6-Chloro-2-iodo-1-methyl-1H-indole 6-Chloro-2-iodo-1-methyl-1H-indole
3-Hydroxy-5-methoxy-N-BOC indole 3-Hydroxy-5-methoxy-N-BOC indole
2-phenyl-7-nitro-5-carboxylic acid indole 2-phenyl-7-nitro-5-carboxylic acid indole
6-methoxy-7-fluoroindole 6-methoxy-7-fluoroindole
N-BOC-3-Bromomethylindole N-BOC-3-Bromomethylindole
N-BOC-5-indole carboxylate N-BOC-5-indole carboxylate
3-Oxo-4-carboxylic acid-2,3-dihydroindole 3-Oxo-4-carboxylic acid-2,3-dihydroindole
6-(3-furyl)-1H-indole 6-(3-furyl)-1H-indole
1-BOC-6,7-dichloro-3-oxindole 1-BOC-6,7-dichloro-3-oxindole
4-Acetyl-α-amino-1H-indole 4-Acetyl-α-amino-1H-indole
4-(2'-BROMOETHYL)-3-CHLORO-1,3-DIHYDRO-2H-INDOLE-2-ONE 4-(2'-BROMOETHYL)-3-CHLORO-1,3-DIHYDRO-2H-INDOLE-2-ONE 120427-95-4 C10H9BrClNO
	Indobufen Impurity 42 Indobufen Impurity 42
Imported indocyanine green activated lipid Imported indocyanine green activated lipid
4-HYDROXY-7-AZAINDOLE 4-HYDROXY-7-AZAINDOLE 74420-02-3 C7H6N2O
7-BROMO-1H-PYRROLO[2,3-C]PYRIDINE
7-BROMO-1H-PYRROLO[2,3-C]PYRIDINE 165669-35-2 C7H5BrN2
2,3,4,5-Tetrahydro-2,8-dimethyl-1H-pyridinyl(4,3-B)indole 2,3,4,5-Tetrahydro-2,8-dimethyl-1H-pyridinyl(4,3-B)indole
disulfo-ICG-amine/NH2 disulfo-ICG-amine/NH2
5-Ethoxyindole 5-Ethoxyindole 10501-17-4 C10H11NO
5,7-DICHLORO-1H-INDOLE-2-CARBOXYLIC ACID ETHYL ESTER 5,7-DICHLORO-1H-INDOLE-2-CARBOXYLIC ACID ETHYL ESTER 4792-70-5 C11H9Cl2NO2
N-ACETYLINDOLE-3-CARBOXALDEHYDE N-ACETYLINDOLE-3-CARBOXALDEHYDE 22948-94-3 C11H9NO2
SU 6668 SU 6668 210644-62-5 C18H18N2O3
2,3-dimethyl-5-(trifluoromethoxy)-1H-indole 2,3-dimethyl-5-(trifluoromethoxy)-1H-indole 2247484-46-2 C11H10F3NO
3-Formyl-4-nitro-7-azaindole 3-Formyl-4-nitro-7-azaindole
5-[(Tetrahydro-2H-pyran-4-yl)oxy]-1H-indole 5-[(Tetrahydro-2H-pyran-4-yl)oxy]-1H-indole 1501305-00-5 C13H15NO2
3-Chloro-6-(trifluoromethyl)-1H-pyrrolo[3,2-c]pyridine 3-Chloro-6-(trifluoromethyl)-1H-pyrrolo[3,2-c]pyridine
7-Methyl-4,5,6,7-tetrahydro-1H-indole 7-Methyl-4,5,6,7-tetrahydro-1H-indole 58956-34-6 C9H13N
6-Bromo-7-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-indole 6-Bromo-7-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-indole 2376880-07-6 C14H17BBrNO2
3-Bromo-6,7-dichloro-2-methyl-1H-indole 3-Bromo-6,7-dichloro-2-methyl-1H-indole 3022402-98-5 C9H6BrCl2N
4-Bromo-6,7-dichloro-1-((2-(trimethylsilyl)ethoxy)methyl)-1H-indole 4-Bromo-6,7-dichloro-1-((2-(trimethylsilyl)ethoxy)methyl)-1H-indole 3022404-05-0 C14H18BrCl2NOSi
6-Bromo-7-chloro-3-iodo-1H-indole 6-Bromo-7-chloro-3-iodo-1H-indole 3022403-67-1 C8H4BrClIN
7-Bromoindole-2-carboxylic acid 7-Bromoindole-2-carboxylic acid 16732-71-1 C9H6BrNO2
α-(p-Aminophenyl)butyric acid α-(p-Aminophenyl)butyric acid 29644-97-1 C10H13NO2
1-(2,9-diazabicyclo[4.3.0]nona-2,4,7,10-tetraen-7-yl)-N,N-dimethyl-methanamine 1-(2,9-diazabicyclo[4.3.0]nona-2,4,7,10-tetraen-7-yl)-N,N-dimethyl-methanamine 5654-92-2 C10H13N3
6-bromo-5-chloro-indole 6-bromo-5-chloro-indole 1191028-50-8 C8H5BrClN
3-(4-chlorobutanoyl)-1H-indole-5-carbonitrile 3-(4-chlorobutanoyl)-1H-indole-5-carbonitrile 276863-95-7 C13H11ClN2O
1H-Isoindol-1-one, 4-broMo-2,3-dihydro-6-hydroxy- 1H-Isoindol-1-one, 4-broMo-2,3-dihydro-6-hydroxy- 808127-76-6 C8H6BrNO2
Octahydro-1H-indole-2-carboxylic acid Octahydro-1H-indole-2-carboxylic acid 80828-13-3 C9H15NO2
1-(benzenesulfonyl)-3-(2,5-dichloropyriMidin-4-yl)-1H-indole 1-(benzenesulfonyl)-3-(2,5-dichloropyriMidin-4-yl)-1H-indole 882562-40-5 C18H11Cl2N3O2S
1H-Indole, 4-broMo-6-(trifluoroMethyl)- 1H-Indole, 4-broMo-6-(trifluoroMethyl)- 1000342-93-7 C9H5BrF3N
2-oxo-2,3-dihydro-1H-pyrrolo[2,3-b]pyridine-5-carbonitrile 2-oxo-2,3-dihydro-1H-pyrrolo[2,3-b]pyridine-5-carbonitrile 1190321-76-6 C8H5N3O
5-Chloro-7-nitroindole 5-Chloro-7-nitroindole 1197181-29-5 C8H5ClN2O2
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