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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
4-chloro- Benzo[b]thiophene 4-chloro- Benzo[b]thiophene 66490-33-3 C8H5ClS
tert-Butyl 4-formyl-5-methoxy-7-methyl-1H-indole-1-carboxylate tert-Butyl 4-formyl-5-methoxy-7-methyl-1H-indole-1-carboxylate 1481631-51-9 C16H19NO4
Ethyl 3-broMopyrazolo[1,5-a]pyriMidine-2-carboxylate Ethyl 3-broMopyrazolo[1,5-a]pyriMidine-2-carboxylate 1394004-05-7 C9H8BrN3O2
1-(1-Benzothiophen-4-yl)piperazine hydrochloride 1-(1-Benzothiophen-4-yl)piperazine hydrochloride 913614-18-3 C12H15ClN2S
2-chloro-5-(2-fluorophenyl)-1H-pyrrole-3-carbonitrile 2-chloro-5-(2-fluorophenyl)-1H-pyrrole-3-carbonitrile 1240948-72-4 C11H6ClFN2
(2-(((1-Chloroethoxy)carbonyl)(methyl)amino)pyridin-3-yl)methyl 2-((tert-butoxycarbonyl)(methyl)amino)acetate (2-(((1-Chloroethoxy)carbonyl)(methyl)amino)pyridin-3-yl)methyl 2-((tert-butoxycarbonyl)(methyl)amino)acetate 338990-31-1 C18H26ClN3O6
2-Methyl-2,7-diazaspiro[3.5]nonane dihydrochloride 2-Methyl-2,7-diazaspiro[3.5]nonane dihydrochloride 1610028-42-6 C8H17ClN2
2-Oxa-5-azaspiro[3.4]octane, ethanedioate (2:1) 2-Oxa-5-azaspiro[3.4]octane, ethanedioate (2:1) 1380571-82-3 C8H13NO5
1,5,6,7-TETRAHYDRO-4H-INDOL-4-ONE 1,5,6,7-TETRAHYDRO-4H-INDOL-4-ONE 13754-86-4 C8H9NO
2-BroMo-5,7-dihydro-7,7-diMethyl-5-phenyl-indeno[2,1-b]carbazole 2-BroMo-5,7-dihydro-7,7-diMethyl-5-phenyl-indeno[2,1-b]carbazole 1257220-44-2 C27H20BrN
3-Bromo-1-tert-butyl-1H-pyrazolo-[3,4-d]pyrimidin-4-amine 3-Bromo-1-tert-butyl-1H-pyrazolo-[3,4-d]pyrimidin-4-amine 862728-61-8 C9H12BrN5
7-Oxa-2-azaspiro[3.5]nonane hydrochloride 7-Oxa-2-azaspiro[3.5]nonane hydrochloride 1417633-09-0 C7H14ClNO
2H-Pyrrolo[2,3-b]pyridin-2-one,5-broMo-1,3-dihydro-3,3-diMethyl- 2H-Pyrrolo[2,3-b]pyridin-2-one,5-broMo-1,3-dihydro-3,3-diMethyl- 1263280-06-3 C9H9BrN2O
4H-Pyrido[1,2-a]pyriMidin-4-one,2-hydroxy-9-Methyl- 4H-Pyrido[1,2-a]pyriMidin-4-one,2-hydroxy-9-Methyl- 17326-09-9 C9H8N2O2
2-Oxa-7-azaspiro[4.5]decane, hydrochloride (1:1) 2-Oxa-7-azaspiro[4.5]decane, hydrochloride (1:1) 374795-37-6 C8H16ClNO
tert-Butyl 4-hydrazinylpiperidine-1-carboxylate hydrochloride tert-Butyl 4-hydrazinylpiperidine-1-carboxylate hydrochloride 1258001-18-1 C10H21N3O2.HCl
3-AMINO-3-(3-CHLORO-PHENYL)-PROPIONIC ACID 3-AMINO-3-(3-CHLORO-PHENYL)-PROPIONIC ACID 68208-21-9 C9H10ClNO2
N-[(3aS,4R,6S,6aR)-Tetrahydro-6-(2-hydroxyethoxy)-2,2-dimethyl-4H-cyclopenta-1,3-dioxol-4-yl]carbamic acid phenylmethyl ester N-[(3aS,4R,6S,6aR)-Tetrahydro-6-(2-hydroxyethoxy)-2,2-dimethyl-4H-cyclopenta-1,3-dioxol-4-yl]carbamic acid phenylmethyl ester 274693-54-8 C18H25NO6
4-BROMO-2-METHYL-2H-INDAZOLE 4-BROMO-2-METHYL-2H-INDAZOLE 590417-93-9 C8H7BrN2
Oxazolo[4,5-c]quinolin-4(5H)-one, 2-(4-chlorophenyl)- Oxazolo[4,5-c]quinolin-4(5H)-one, 2-(4-chlorophenyl)- 148563-25-1 C16H9ClN2O2
(S)-methyl hexahydropyridazine-3-carboxylate (S)-methyl hexahydropyridazine-3-carboxylate 138323-07-6 C6H12N2O2
Nicotinic Acid Riboside Nicotinic Acid Riboside 17720-18-2 C11H13NO6
4-Bromo-6-chloro-5-iodo-1H-indazole 4-Bromo-6-chloro-5-iodo-1H-indazole 2891597-77-4 C7H3BrClIN2
mebikar mebikar 10095-06-4 C8H14N4O2
2-(PIPERAZIN-1-YL)-ACETIC ACID H2O 2-(PIPERAZIN-1-YL)-ACETIC ACID H2O 37478-58-3 C6H12N2O2
(S)-4-(tert-butyl)-5,5-dimethyl-2-(2-pyridyl)-4,5-oxazoline (S)-4-(tert-butyl)-5,5-dimethyl-2-(2-pyridyl)-4,5-oxazoline
N-desmethylxanomeline N-desmethylxanomeline 131986-96-4 C13H21N3OS
(4S)-3-[(5R)-5-(4-FLUOROPHENYL)-5-HYDROXYPENTANOYL]-4-PHENYL-1,3-OXAZOLIDIN-2-ONE (4S)-3-[(5R)-5-(4-FLUOROPHENYL)-5-HYDROXYPENTANOYL]-4-PHENYL-1,3-OXAZOLIDIN-2-ONE 189028-95-3 C20H20FNO4
6-BROMO-2-METHYL-2H-INDAZOLE 6-BROMO-2-METHYL-2H-INDAZOLE 590417-95-1 C8H7BrN2
1-(5-Bromo-3-pyridyl)piperazine 1-(5-Bromo-3-pyridyl)piperazine 412347-30-9 C9H12BrN3
2-mercapto-3,5-dimethylthieno[2,3-d]pyrimidin-4(3H)-one 2-mercapto-3,5-dimethylthieno[2,3-d]pyrimidin-4(3H)-one 51486-14-7 C8H8N2OS2
3-(5-methyl-1H-tetrazol-1-yl)aniline 3-(5-methyl-1H-tetrazol-1-yl)aniline 500701-24-6 C8H9N5
2,3,4,5-Tetrahydro-3-(trifluoroacetyl)-1,5-methano-1H-3-benzazepine 2,3,4,5-Tetrahydro-3-(trifluoroacetyl)-1,5-methano-1H-3-benzazepine 230615-51-7 C13H12F3NO
(1S,2S)-N,N'-Dihydroxy-N,N'-bis(diphenylacetyl)cyclohexane-1,2-diamine (1S,2S)-N,N'-Dihydroxy-N,N'-bis(diphenylacetyl)cyclohexane-1,2-diamine 1217464-22-6 C34H34N2O4
METHYL 1H-PYRROLO[2,3-C]PYRIDINE-5-CARBOXYLATE METHYL 1H-PYRROLO[2,3-C]PYRIDINE-5-CARBOXYLATE 147071-00-9 C9H8N2O2
2,7-DIAZA-SPIRO[4.4]NONANE-2-CARBOXYLIC ACID TERT-BUTYL ESTER 2,7-DIAZA-SPIRO[4.4]NONANE-2-CARBOXYLIC ACID TERT-BUTYL ESTER 236406-49-8 C12H22N2O2
3-(trifluoromethyl)cyclohexane-1-carboxylic acid 3-(trifluoromethyl)cyclohexane-1-carboxylic acid 104907-44-0 C8H11F3O2
3-Amino-5-mercapto-1,2,4-triazole 3-Amino-5-mercapto-1,2,4-triazole 16691-43-3 C2H4N4S
(S)-4-Methyl-2,5-oxazolidonedione (S)-4-Methyl-2,5-oxazolidonedione 2224-52-4 C4H5NO3
6-Fluoroindole-2-carboxylic acid 6-Fluoroindole-2-carboxylic acid 3093-97-8 C9H6FNO2
BBT-176 BBT-176 2254805-44-0 C28H37ClN8O3S
2,2'-BIPYRIMIDINE 2,2'-BIPYRIMIDINE 34671-83-5 C8H6N4
4,7,8-TRICHLOROQUINOLINE 4,7,8-TRICHLOROQUINOLINE 17999-80-3 C9H4Cl3N
4,6-DICHLORO-2-(4-FLUOROPHENYL)PYRIMIDINE 4,6-DICHLORO-2-(4-FLUOROPHENYL)PYRIMIDINE 83217-30-5 C10H5Cl2FN2
3-HYDROXY-CYCLOBUTANECARBOXYLIC ACID BENZYL ESTER 3-HYDROXY-CYCLOBUTANECARBOXYLIC ACID BENZYL ESTER 480449-99-8 C12H14O3
Tert-butyl 4-(6-nitropyridin-3-yl)piperazine-1-carboxylate Tert-butyl 4-(6-nitropyridin-3-yl)piperazine-1-carboxylate 571189-16-7 C14H20N4O4
2-(3-(TERT-BUTOXYCARBONYL)-3-AZASPIRO[5.5]UNDECAN-9-YL)ACETIC ACID 2-(3-(TERT-BUTOXYCARBONYL)-3-AZASPIRO[5.5]UNDECAN-9-YL)ACETIC ACID 952480-32-9 C17H29NO4
(2-CHLORO-8-METHYLQUINOLIN-3-YL)METHANOL (2-CHLORO-8-METHYLQUINOLIN-3-YL)METHANOL 333408-31-4 C11H10ClNO
(7a,17b)-7-(9-Bromononyl)-estra-1,3,5(10)-triene-3,17-diol 17-acetate (7a,17b)-7-(9-Bromononyl)-estra-1,3,5(10)-triene-3,17-diol 17-acetate 875573-66-3 C29H43BrO3
1-(2-Pyridyl)cyclopropylamine Dihydrochloride 1-(2-Pyridyl)cyclopropylamine Dihydrochloride 1215107-39-3 C8H11ClN2
2,7-diazaspiro[4.4]nonan-1-one 2,7-diazaspiro[4.4]nonan-1-one 1203796-97-7 C7H12N2O
3-Amino-5-bromo-thiophene-2-carboxylic acid methyl ester 3-Amino-5-bromo-thiophene-2-carboxylic acid methyl ester 107818-55-3 C6H6BrNO2S
tert-butyl (3S,4R)-3-fluoro-4-hydroxypiperidine-1-carboxylate tert-butyl (3S,4R)-3-fluoro-4-hydroxypiperidine-1-carboxylate 1174020-40-6 C10H18FNO3
3-Piperidin-4-yl-azetidine-1-carboxylic acid tert-butyl ester 3-Piperidin-4-yl-azetidine-1-carboxylic acid tert-butyl ester 1251006-64-0 C13H24N2O2
5-Bromo-quinoxaline-2,3-diol 5-Bromo-quinoxaline-2,3-diol 1092285-97-6 C8H5BrN2O2
1-(CHLOROMETHYL)-4-ETHYNYLBENZENE 1-(CHLOROMETHYL)-4-ETHYNYLBENZENE 10601-98-6 C9H7Cl
4-Bromomethypiperidine-1-carboxylic acid tert-butyl ester 4-Bromomethypiperidine-1-carboxylic acid tert-butyl ester 158407-04-6 C11H20BrNO2
7-Hydroxyquinolinone 7-Hydroxyquinolinone 70500-72-0 C9H7NO2
3-AMINO-3-(2-FLUORO-PHENYL)-PROPIONIC ACID 3-AMINO-3-(2-FLUORO-PHENYL)-PROPIONIC ACID 117391-49-8 C9H10FNO2
6-BROMO-1H-INDAZOLE-3-CARBALDEHYDE 6-BROMO-1H-INDAZOLE-3-CARBALDEHYDE 885271-72-7 C8H5BrN2O
4-Chloro-1-(2-methylpropyl)-1H-imidazo[4,5-c]quinoline 4-Chloro-1-(2-methylpropyl)-1H-imidazo[4,5-c]quinoline 99010-64-7 C14H14ClN3
BMK Glycidic Acid (sodium salt) BMK Glycidic Acid (sodium salt) 5449-12-7 C10H11NaO3
4,6-dichloro-2-cyclobutylpyrimidine 4,6-dichloro-2-cyclobutylpyrimidine 1353856-95-7 C8H8Cl2N2
5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyrazine-2-carbonitrile 5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyrazine-2-carbonitrile 1186041-94-0 C11H14BN3O2
7-oxaspiro[3.5]nonan-2-amine 7-oxaspiro[3.5]nonan-2-amine 1374658-89-5 C8H15NO
2 6-BIS[(4S 5S)-4-METHYL-5-PHENYL-2-OXA& 2 6-BIS[(4S 5S)-4-METHYL-5-PHENYL-2-OXA& 185346-20-7 C25H23N3O2
2,2-dimethoxycyclohexanol 2,2-dimethoxycyclohexanol 63703-34-4 C8H16O3
ETHYL 2-(TRIFLUOROMETHYL)THIAZOLE-5-CARBOXYLATE ETHYL 2-(TRIFLUOROMETHYL)THIAZOLE-5-CARBOXYLATE 131748-96-4 C7H6F3NO2S
2,3-Quinoxalinedione, 5-chloro-1,4-dihydro- 2,3-Quinoxalinedione, 5-chloro-1,4-dihydro- 127731-60-6 C8H5ClN2O2
Benzonitrile, 3-(2-amino-6-chloro-4-pyrimidinyl)-2-methyl- Benzonitrile, 3-(2-amino-6-chloro-4-pyrimidinyl)-2-methyl- 2239278-05-6 C12H9ClN4
(4-amino-2-methyl-pyrimidin-5-ylmethyl)-dithiocarbamic acid (4-amino-2-methyl-pyrimidin-5-ylmethyl)-dithiocarbamic acid 2882-49-7 C7H10N4S2
(S)-2-(2,2,2-trifluoroethyl)piperazine dihydrochloride (S)-2-(2,2,2-trifluoroethyl)piperazine dihydrochloride
Activated DPG Subunit Activated DPG Subunit 1155309-89-9 C51H53ClN7O7P
2-Morpholino-6-oxo-1,6-dihydropyrimidine-4-carboxylic acid 2-Morpholino-6-oxo-1,6-dihydropyrimidine-4-carboxylic acid 933686-76-1 C9H11N3O4
1H-PYRROLO[2,3-B]PYRIDINE-5-CARBOXYLIC ACID METHYL ESTER 1H-PYRROLO[2,3-B]PYRIDINE-5-CARBOXYLIC ACID METHYL ESTER 849067-96-5 C9H8N2O2
5-(2-THIENYL)-1H-TETRAZOLE 5-(2-THIENYL)-1H-TETRAZOLE 59541-58-1 C5H4N4S
2,4,6-TRIPHENYLPYRIDINE 2,4,6-TRIPHENYLPYRIDINE 580-35-8 C23H17N
4-Pyrimidinecarboxylic acid 4-Pyrimidinecarboxylic acid 31462-59-6 C5H4N2O2
5-BROMO-3-CHLORO-2-METHYLPYRIDINE 5-BROMO-3-CHLORO-2-METHYLPYRIDINE 914358-72-8 C6H5BrClN
2H-1,4-Oxazino[3,2-c]quinolin-3(4H)-one, 9-bromo-4-methyl- 2H-1,4-Oxazino[3,2-c]quinolin-3(4H)-one, 9-bromo-4-methyl- 1620971-61-0 C12H9BrN2O2
4-(3-Chlorophenyl)-2-(4-nitrophenoxy)-1,3,2-dioxaphosphinane 2-oxide 4-(3-Chlorophenyl)-2-(4-nitrophenoxy)-1,3,2-dioxaphosphinane 2-oxide 883989-27-3 C15H13ClNO6P
8-BROMOQUINOLIN-2(1H)-ONE 8-BROMOQUINOLIN-2(1H)-ONE 67805-67-8 C9H6BrNO
4-OXOAZETIDINE-2-CARBOXYLIC ACID 4-OXOAZETIDINE-2-CARBOXYLIC ACID 98019-65-9 C4H5NO3
Pyrimidine, 2-chloro-4-(4-chlorophenoxy)-5-fluoro- Pyrimidine, 2-chloro-4-(4-chlorophenoxy)-5-fluoro- 1503263-51-1 C10H5Cl2FN2O
Pyrazolo[1,5-a]pyridine Pyrazolo[1,5-a]pyridine 274-56-6 C7H6N2
Ethyl-2-Ethoxy-1-[[(2'-Cyanobiphenyl-4-yl) Methyl] Benzimidazole]-7-Carboxylate Ethyl-2-Ethoxy-1-[[(2'-Cyanobiphenyl-4-yl) Methyl] Benzimidazole]-7-Carboxylate 139481-41-7 C26H23N3O3
2,4,6,8-Tetrahydroxy-Pyrimido-(5,4D)Pyrimidine 2,4,6,8-Tetrahydroxy-Pyrimido-(5,4D)Pyrimidine 6713-54-8 C6H4N4O4
bis(dibutyldithiocarbamato-S,S')copper bis(dibutyldithiocarbamato-S,S')copper 13927-71-4 C18H36CuN2S4
6-Chloro-2-mercaptobenzothiazole 6-Chloro-2-mercaptobenzothiazole 51618-29-2 C7H4ClNS2
2,3-dihydroxypropyl 4-hydroxybenzoate 2,3-dihydroxypropyl 4-hydroxybenzoate 93778-15-5 C10H12O5
2-Oxa-4,9-diazaspiro[5.5]undecan-3-one 2-Oxa-4,9-diazaspiro[5.5]undecan-3-one 561314-58-7 C8H14N2O2
Pyrido[2,3-b]pyrazine-2,3-dione, 8-bromo-1,4-dihydro- Pyrido[2,3-b]pyrazine-2,3-dione, 8-bromo-1,4-dihydro- 1514719-37-9 C7H4BrN3O2
2,4-DICHLORO-5-METHYL-PHENYLAMINE 2,4-DICHLORO-5-METHYL-PHENYLAMINE 17601-75-1 C7H7Cl2N
1,4-Diazepan-5-one hydrochloride 1,4-Diazepan-5-one hydrochloride 208245-76-5 C5H11ClN2O
Piperazine, 1-(cyclobutylmethyl)- (9CI) Piperazine, 1-(cyclobutylmethyl)- (9CI) 82534-54-1 C9H18N2
N-desethyl Etonitazene N-desethyl Etonitazene 2732926-26-8 C20H24N4O3
5-Aminotetrazole 5-Aminotetrazole 4418-61-5 CH3N5
2-BROMO-4-METHOXY-6-NITROTOLUENE 2-BROMO-4-METHOXY-6-NITROTOLUENE 62827-41-2 C8H8BrNO3
Cyclohexanecarboxylic acid, 4-hydroxy-1-methyl-, 1-naphthalenylmethyl ester, trans- Cyclohexanecarboxylic acid, 4-hydroxy-1-methyl-, 1-naphthalenylmethyl ester, trans- 2787515-80-2 C19H22O3
1-Piperidinecarboxylicacid,2-methyl-4-oxo-,1,1-dimethylethylester,(2R)-(9CI) 1-Piperidinecarboxylicacid,2-methyl-4-oxo-,1,1-dimethylethylester,(2R)-(9CI) 790667-43-5 C11H19NO3
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