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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
6-Bromo-2-mercaptobenzothiazole 6-Bromo-2-mercaptobenzothiazole 51618-30-5 C7H4BrNS2
ETHYL 2-(3-FORMYL-4-ISOBUTOXYPHENYL)-4-METHYLTHIAZOLE-5-CARBOXYLATE ETHYL 2-(3-FORMYL-4-ISOBUTOXYPHENYL)-4-METHYLTHIAZOLE-5-CARBOXYLATE 161798-03-4 C18H21NO4S
8-Chloro-3-iodoimidazo[1,2-a]pyrazine 8-Chloro-3-iodoimidazo[1,2-a]pyrazine 1049677-32-8 C6H3ClIN3
L-Valine, 3-methyl-N-(trifluoroacetyl)- (9CI) L-Valine, 3-methyl-N-(trifluoroacetyl)- (9CI) 666832-71-9 C8H12F3NO3
5-bromo-1,10-phenanthroline 5-bromo-1,10-phenanthroline 40000-20-2 C12H7BrN2
ditetradecylamine ditetradecylamine 17361-44-3 C28H59N
6-Chloro-1-tetralone 6-Chloro-1-tetralone 26673-31-4 C10H9ClO
1-Ethylimidazole 1-Ethylimidazole 7098-07-9 C5H8N2
Ethyl 5-cyanoindole-2-carboxylate Ethyl 5-cyanoindole-2-carboxylate 105191-13-7 C12H10N2O2
BOC-THIONOPHE-1-(6-NITRO)BENZOTRIAZOLIDE BOC-THIONOPHE-1-(6-NITRO)BENZOTRIAZOLIDE 184951-87-9 C20H21N5O4S
Glycine, L-α-glutamylglycyl-L-threonyl-L-phenylalanyl-L-threonyl-L-seryl-L-α-aspartyl-L-valyl-L-seryl-L-seryl-L-tyrosyl-L-leucyl-L-α-glutamylglycyl-L-glutaminyl-L-alanyl-L-alanyl-L-lysyl-L-α-glutamyl-L-phenylalanyl-L-isoleucyl-L-alanyl-L-tryptophyl-L-leucyl-L-valyl-L-arginylglycyl-L-arginyl- Glycine, L-α-glutamylglycyl-L-threonyl-L-phenylalanyl-L-threonyl-L-seryl-L-α-aspartyl-L-valyl-L-seryl-L-seryl-L-tyrosyl-L-leucyl-L-α-glutamylglycyl-L-glutaminyl-L-alanyl-L-alanyl-L-lysyl-L-α-glutamyl-L-phenylalanyl-L-isoleucyl-L-alanyl-L-tryptophyl-L-leucyl-L-valyl-L-arginylglycyl-L-arginyl- 1169630-82-3 C142H216N38O45
2-Bromo-4-nitroimidazole 2-Bromo-4-nitroimidazole 65902-59-2 C3H2BrN3O2
2-Chloro-5-hydroxypyrimidine 2-Chloro-5-hydroxypyrimidine 4983-28-2 C4H3ClN2O
Piperazine, 1,2,2-trimethyl- (9CI) Piperazine, 1,2,2-trimethyl- (9CI) 396133-32-7 C7H16N2
7-BROMO-1H-INDOLE-3-CARBOXYLIC ACID 7-BROMO-1H-INDOLE-3-CARBOXYLIC ACID 86153-25-5 C9H6BrNO2
4-BROMO-8-METHOXYQUINOLINE 4-BROMO-8-METHOXYQUINOLINE 103028-31-5 C10H8BrNO
N-BOC-1,2,3,6-TETRAHYDROPYRIDINE N-BOC-1,2,3,6-TETRAHYDROPYRIDINE 85838-94-4 C10H17NO2
2,5-Oxazolidinedione, 3,4-dimethyl- 2,5-Oxazolidinedione, 3,4-dimethyl- 51784-00-0 C5H7NO3
5-BROMO-2-CHLOROBENZOTHIAZOLE 5-BROMO-2-CHLOROBENZOTHIAZOLE 824403-26-1 C7H3BrClNS
1-Chloro-1H-pyrrolo[1,2-a]pyrazine 1-Chloro-1H-pyrrolo[1,2-a]pyrazine 136927-64-5 C7H5ClN2
5-CHLORO-1H-PYRROLO[2,3-C]PYRIDINE 5-CHLORO-1H-PYRROLO[2,3-C]PYRIDINE 131084-55-4 C7H5ClN2
6-Amino-2,2-dimethyl-2H-pyrido[3,2-B][1,4]oxazin-3(4H)-one 6-Amino-2,2-dimethyl-2H-pyrido[3,2-B][1,4]oxazin-3(4H)-one 1002726-62-6 C9H11N3O2
4,4-DIFLUOROHEXAHYDRO-1H-AZEPINE HYDROCHLORIDE 4,4-DIFLUOROHEXAHYDRO-1H-AZEPINE HYDROCHLORIDE 1094073-72-9 C6H12ClF2N
3-Bromo-7-chloropyrazolo[1,5-a]pyrimidine 3-Bromo-7-chloropyrazolo[1,5-a]pyrimidine 877173-84-7 C6H3BrClN3
(3-Hydroxy-1-pyrrolidinyl)(4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridin-3-yl)methanone HCl (3-Hydroxy-1-pyrrolidinyl)(4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridin-3-yl)methanone HCl 1219976-33-6 C11H17ClN4O2
(S)-(3-(3,4-dichlorophenyl)-3-(3-iodopropyl)piperidin-1-yl)(phenyl)methanone (S)-(3-(3,4-dichlorophenyl)-3-(3-iodopropyl)piperidin-1-yl)(phenyl)methanone 188916-67-8 C21H22Cl2INO
3-(cyclopropylmethoxy)-4-(difluoromethoxy)benzoic Acid 3-(cyclopropylmethoxy)-4-(difluoromethoxy)benzoic Acid 162401-62-9 C12H12F2O4
4-AMino-5-Methylpyridin-2-ol 4-AMino-5-Methylpyridin-2-ol 95306-64-2 C6H8N2O
4-HO-MiPT 4-HO-MiPT 77872-43-6 C14H20N2O
tert-butyl 4-(1H-benzo[d]iMidazol-2-yl)piperidine-1-carboxylate tert-butyl 4-(1H-benzo[d]iMidazol-2-yl)piperidine-1-carboxylate 953071-73-3 C17H23N3O2
3-Methylsulfonyl-azetidine hydrochloride 3-Methylsulfonyl-azetidine hydrochloride 1400764-60-4 C4H10ClNO2S
Piperazine, 1-(cyclopropylcarbonyl)-, Monohydrochloride Piperazine, 1-(cyclopropylcarbonyl)-, Monohydrochloride 1021298-67-8 C8H15ClN2O
tert-butyl (1R,2S,5S)-2-aMino-5-(diMethylcarbaMoyl)cyclohexylcarbaMate tert-butyl (1R,2S,5S)-2-aMino-5-(diMethylcarbaMoyl)cyclohexylcarbaMate 365998-36-3 C14H27N3O3
2-(2-butyl-4-hydroxy-6-MethylpyriMidin-5-yl)-N,N-diMethylacetaMide 2-(2-butyl-4-hydroxy-6-MethylpyriMidin-5-yl)-N,N-diMethylacetaMide 1315478-13-7 C13H21N3O2
	2-Chloro-7-cyclopentyl-N,N-dimethyl-H-pyrrolo[2,3-d]pyrimidine-6-carboxamide 2-Chloro-7-cyclopentyl-N,N-dimethyl-H-pyrrolo[2,3-d]pyrimidine-6-carboxamide 1211443-61-6 C14H17ClN4O
1-[2-Chloro-1-hydroxy-3-(6-quinolinyl)propyl]-2,5-pyrrolidinedione 1-[2-Chloro-1-hydroxy-3-(6-quinolinyl)propyl]-2,5-pyrrolidinedione 1197377-31-3 C16H15ClN2O3
2-Chloro-5-(trifluoromethyl)benzyl alcohol 2-Chloro-5-(trifluoromethyl)benzyl alcohol 64372-62-9 C8H6ClF3O
(3-Bromophenyl)triphenylsilane (3-Bromophenyl)triphenylsilane 185626-73-7 C24H19BrSi
1-methyl-3-((methylamino)methyl)-1H-pyrazole-5-carbonitrilehydrochloride 1-methyl-3-((methylamino)methyl)-1H-pyrazole-5-carbonitrilehydrochloride 1643141-20-1 C7H11ClN4
3-Bromo-4,5-dichlorotoluene 3-Bromo-4,5-dichlorotoluene 960305-14-0 C7H5BrCl2
1-Ethyl-1-cyclohexyl acrylate 1-Ethyl-1-cyclohexyl acrylate 251909-25-8 C11H18O2
1-(1-(1H-imidazole-1-carbonyl)piperidin-4-yl)-1H-imidazo[4,5-b]pyridin-2(3H)-one 1-(1-(1H-imidazole-1-carbonyl)piperidin-4-yl)-1H-imidazo[4,5-b]pyridin-2(3H)-one 1373116-06-3 C15H16N6O2
4-Bromo-3-fluorobenzenesulfonyl chloride 4-Bromo-3-fluorobenzenesulfonyl chloride 351003-51-5 C6H3BrClFO2S
6-METHYLINDOLE-3-CARBOXALDEHYDE 6-METHYLINDOLE-3-CARBOXALDEHYDE 4771-49-7 C10H9NO
3-(3-Indolyl)-2-oxopropanoic acid 3-(3-Indolyl)-2-oxopropanoic acid 392-12-1 C11H9NO3
2-AMINO-8-CHLOROPYRIDO[3,4-D]PYRIMIDIN-4(3H)-ONE 2-AMINO-8-CHLOROPYRIDO[3,4-D]PYRIMIDIN-4(3H)-ONE 1413424-77-7 C7H5ClN4O
D-Lysergic Acid Methyl Ester D-Lysergic Acid Methyl Ester 4579-64-0 C17H18N2O2
2,3-DIHYDROXYPROPYL ACRYLATE 2,3-DIHYDROXYPROPYL ACRYLATE 10095-20-2 C6H10O4
K-11777 K-11777 233277-99-1 C32H38N4O4S
6-CHLORO-2-METHYLINDOLE 6-CHLORO-2-METHYLINDOLE 6127-17-9 C9H8ClN
NNMTi NNMTi 42464-96-0
(R)-2-((trifluoromethoxy)methyl)piperazine dihydrochloride (R)-2-((trifluoromethoxy)methyl)piperazine dihydrochloride
(R)-2-(2,2-difluoroethyl)piperazine (R)-2-(2,2-difluoroethyl)piperazine
(R)-2-(2,2-difluoroethyl)piperazine dihydrochloride (R)-2-(2,2-difluoroethyl)piperazine dihydrochloride
2S-(2ALPHA,3ALPHA,BETA,7ALPHA,BETA-OCTAHYDRO-1H-INDOLE-2-CARBOXYLIC ACID PHENYL METHYL ESTER 2S-(2ALPHA,3ALPHA,BETA,7ALPHA,BETA-OCTAHYDRO-1H-INDOLE-2-CARBOXYLIC ACID PHENYL METHYL ESTER 94062-52-9 C23H29NO5S
5,6,7,8-TETRAHYDRO-6-(PHEHYLMETHYL)-1,6-NAPHTHYRIDIN-3-AMINE 5,6,7,8-TETRAHYDRO-6-(PHEHYLMETHYL)-1,6-NAPHTHYRIDIN-3-AMINE 214699-26-0 C15H17N3
5-Bromo-4,7-diazaindole 5-Bromo-4,7-diazaindole 875781-43-4 C6H4BrN3
Furo[2,3-d]pyrimidin-4-amine (9CI) Furo[2,3-d]pyrimidin-4-amine (9CI) 186454-70-6 C6H5N3O
4-(5-Nitropyridin-2-yl)morpholine 4-(5-Nitropyridin-2-yl)morpholine 26820-62-2 C9H11N3O3
Pyrimidine, 5-(chloromethyl)- (9CI) Pyrimidine, 5-(chloromethyl)- (9CI) 101346-02-5 C5H5ClN2
3-AMINOMETHYL-6-(TRIFLUOROMETHYL)PYRIDINE 3-AMINOMETHYL-6-(TRIFLUOROMETHYL)PYRIDINE 387350-39-2 C7H7F3N2
3-Bromo-4-trifluoromethylpyridine 3-Bromo-4-trifluoromethylpyridine 936841-70-2 C6H3BrF3N
Sulfa chloradazine sodium Sulfa chloradazine sodium
2-Bromo-4-(trifluoro methyl)pryrimidine 2-Bromo-4-(trifluoro methyl)pryrimidine 785777-87-9 C5H2BrF3N2
6-Chloro-1H-indazole 6-Chloro-1H-indazole 698-25-9 C7H5ClN2
2-(1H-indol-3-yl)acetaldehyde 2-(1H-indol-3-yl)acetaldehyde 2591-98-2 C10H9NO
(6-Methylpyridin-3-yl)methanol (6-Methylpyridin-3-yl)methanol 34107-46-5 C7H9NO
1,3,4-oxadiazole 1,3,4-oxadiazole 288-99-3 C2H2N2O
2H-Pyrrolo[3,2-c]pyridin-2-one,1,3-dihydro-(9CI) 2H-Pyrrolo[3,2-c]pyridin-2-one,1,3-dihydro-(9CI) 134682-54-5 C7H6N2O
3-Fluoropyridine-4-carbonitrile 3-Fluoropyridine-4-carbonitrile 113770-88-0 C6H3FN2
1-methylpseudouridine 1-methylpseudouridine 13860-38-3 C10H14N2O6
4-(2-(5-Ethyl-2-pyridyl)ethoxy)nitrobenzene 4-(2-(5-Ethyl-2-pyridyl)ethoxy)nitrobenzene 85583-54-6 C15H16N2O3
2-chloro-5-(trifluoromethyl)pyridine-3-boronic acid 2-chloro-5-(trifluoromethyl)pyridine-3-boronic acid 536693-96-6 C6H4BClF3NO2
2,3,4,5-Tetrahydro-7,8-dinitro-3-(trifluoroacetyl)-1,5-methano-1H-3-benzazepine 2,3,4,5-Tetrahydro-7,8-dinitro-3-(trifluoroacetyl)-1,5-methano-1H-3-benzazepine 230615-59-5 C13H10F3N3O5
5-FLUORO-2,3-DIHYDRO-(1H)-INDOLE 5-FLUORO-2,3-DIHYDRO-(1H)-INDOLE 94805-51-3 C6H4N2O
4-AMINO-2-(METHYLTHIO)PYRIMIDINE-5-CARBOXAMIDE 4-AMINO-2-(METHYLTHIO)PYRIMIDINE-5-CARBOXAMIDE 89533-28-8 C6H8N4OS
4-METHOXY (1H)INDAZOLE 4-METHOXY (1H)INDAZOLE 351210-06-5 C8H8N2O
6-Trifluoromethyl-pyridine-2-carboxylic acid ethyl ester
6-Trifluoromethyl-pyridine-2-carboxylic acid ethyl ester 1010422-92-0 C9H8F3NO2
2,5-DICHLORO-4-(4,4,5,5-TETRAMETHYL-[1,3,2]-DIOXABOROLAN-2-YL)PYRIDINE 2,5-DICHLORO-4-(4,4,5,5-TETRAMETHYL-[1,3,2]-DIOXABOROLAN-2-YL)PYRIDINE 1073353-98-6 C11H14BCl2NO2
8-BROMO-2-(TRIFLUOROMETHYL)QUINOLIN-4-OL 8-BROMO-2-(TRIFLUOROMETHYL)QUINOLIN-4-OL 59108-43-9 C10H5BrF3NO
2-Bromo-6-chloroquinoline 2-Bromo-6-chloroquinoline 891842-50-5 C9H5BrClN
5-bromothiophene-3-carboxylic acid 5-bromothiophene-3-carboxylic acid 100523-84-0 C5H3BrO2S
2-(5-bromopyridin-2-yl)acetic acid 2-(5-bromopyridin-2-yl)acetic acid 192642-85-6 C7H6BrNO2
ethyl 4-bromo-1H-pyrrolo[2,3-b]pyridine-2-carboxylate ethyl 4-bromo-1H-pyrrolo[2,3-b]pyridine-2-carboxylate 942920-55-0 C10H9BrN2O2
2,3,4,5-Tetrahydro-3-(trifluoroacetyl)-1,5-methano-1H-3-benzazepine-7,8-diamine 2,3,4,5-Tetrahydro-3-(trifluoroacetyl)-1,5-methano-1H-3-benzazepine-7,8-diamine 230615-69-7 C13H14F3N3O
thiophen-3-amine oxalate thiophen-3-amine oxalate 861965-63-1 C6H7NO4S
2,6-Dibromopyrazine 2,6-Dibromopyrazine 23229-25-6 C4H2Br2N2
6-chloro-4-methyl-2H-pyridazin-3-one 6-chloro-4-methyl-2H-pyridazin-3-one 1834-27-1 C5H5ClN2O
2-Pyridinethiol 1-oxide 2-Pyridinethiol 1-oxide 1121-31-9 C5H5NOS
1H-INDOLE-2-CARBOXYLIC ACID HYDRAZIDE 1H-INDOLE-2-CARBOXYLIC ACID HYDRAZIDE 5055-39-0 C9H9N3O
(5-BROMOPYRAZIN-2-YL)CARBAMIC ACID TERT-BUTYL ESTER (5-BROMOPYRAZIN-2-YL)CARBAMIC ACID TERT-BUTYL ESTER 914349-79-4 C9H12BrN3O2
3-bromo-1H-pyrazolo[4,3-c]pyridine 3-bromo-1H-pyrazolo[4,3-c]pyridine 633328-88-8 C6H4BrN3
(5-Methyl-2-oxo-1,3-dioxol-4-yl)methyl 4-nitrophenyl carbonate (5-Methyl-2-oxo-1,3-dioxol-4-yl)methyl 4-nitrophenyl carbonate 173604-87-0 C12H9NO8
4-IODO-3-METHYLANILINE 4-IODO-3-METHYLANILINE 4949-69-3 C7H8IN
(R)-3-amino-1-butanol (R)-3-amino-1-butanol 61477-40-5 C4H11NO
5-Bromoindole-2-carboxylic acid methyl ester 5-Bromoindole-2-carboxylic acid methyl ester 210345-56-5 C10H8BrNO2
3'-Fluoro-5'-(trifluoromethyl)acetophenone 3'-Fluoro-5'-(trifluoromethyl)acetophenone 202664-54-8 C9H6F4O
1-Cyclopropyl-6-fluoro-1,4-dihydro-8-hydroxy-7-[(4aS,7aS)-octahydro-6H-pyrrolo[3,4-b]pyridin-6-yl]-4-oxo-3-quinolinecarboxylic acid 1-Cyclopropyl-6-fluoro-1,4-dihydro-8-hydroxy-7-[(4aS,7aS)-octahydro-6H-pyrrolo[3,4-b]pyridin-6-yl]-4-oxo-3-quinolinecarboxylic acid 721970-36-1 C20H22FN3O4
1,4-Bis(benzhydryl)piperazine Dihydrochloride 1,4-Bis(benzhydryl)piperazine Dihydrochloride 56265-29-3 C30H32Cl2N2
6-BroMo-5-chloro-pyridine-2-carboxylic acid 6-BroMo-5-chloro-pyridine-2-carboxylic acid 1214328-42-3 C6H3BrClNO2
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