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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
3'-Fluoro-5'-(trifluoromethyl)acetophenone 3'-Fluoro-5'-(trifluoromethyl)acetophenone 202664-54-8 C9H6F4O
2H-Pyran-4-carboxylic acid, 4-[[(2S)-2-[[(9H-fluoren-9-ylmethoxy)carbonyl]amino]-3-(2-naphthalenyl)-1-oxopropyl]amino]tetrahydro- 2H-Pyran-4-carboxylic acid, 4-[[(2S)-2-[[(9H-fluoren-9-ylmethoxy)carbonyl]amino]-3-(2-naphthalenyl)-1-oxopropyl]amino]tetrahydro- 3040307-33-0
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
4,4-DIFLUOROHEXAHYDRO-1H-AZEPINE HYDROCHLORIDE 4,4-DIFLUOROHEXAHYDRO-1H-AZEPINE HYDROCHLORIDE 1094073-72-9 C6H12ClF2N
tert-Butyl (azetidin-3-yl)carbamate hydrochloride tert-Butyl (azetidin-3-yl)carbamate hydrochloride 217806-26-3 C8H16N2O2.HCl
3,4-Dibromo-5-methylpyrazole 3,4-Dibromo-5-methylpyrazole 5932-19-4 C4H4Br2N2
(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
3-Bromo-7-chloropyrazolo[1,5-a]pyrimidine 3-Bromo-7-chloropyrazolo[1,5-a]pyrimidine 877173-84-7 C6H3BrClN3
4-Amino-2-hydroxy-5-methylpyridine 4-Amino-2-hydroxy-5-methylpyridine 95306-64-2 C6H8N2O
4-HO-MiPT 4-HO-MiPT 77872-43-6 C14H20N2O
(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
1H-INDOLE-2-CARBOXYLIC ACID HYDRAZIDE 1H-INDOLE-2-CARBOXYLIC ACID HYDRAZIDE 5055-39-0 C9H9N3O
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
2-(4-Bromophenyl)-1-phenyl-1H-benzoimidazole 2-(4-Bromophenyl)-1-phenyl-1H-benzoimidazole 2620-76-0 C19H13BrN2
Sulfa chloradazine sodium Sulfa chloradazine sodium
2-Bromo-4-(trifluoro methyl)pryrimidine 2-Bromo-4-(trifluoro methyl)pryrimidine 785777-87-9 C5H2BrF3N2
2H-Indazole, 2-methyl-3-(1-methylethyl)-5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)- 2H-Indazole, 2-methyl-3-(1-methylethyl)-5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)- 1838198-12-1 C17H25BN2O2
6-Chloro-1H-indazole 6-Chloro-1H-indazole 698-25-9 C7H5ClN2
3-Isoquinolinamine, 8-chloro-6-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)- 3-Isoquinolinamine, 8-chloro-6-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)- 2246368-85-2 C15H18BClN2O2
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
1H,1H,2H,2H-Perfluorohexyl iodide 1H,1H,2H,2H-Perfluorohexyl iodide 2043-55-2 C6H4F9I
1H-Pyrazole-3-carboxylicacid,1-methyl-,ethylester(9CI) 1H-Pyrazole-3-carboxylicacid,1-methyl-,ethylester(9CI) 88529-79-7 C7H10N2O2
1-methylpseudouridine 1-methylpseudouridine 13860-38-3 C10H14N2O6
4-BROMO-BENZO[B]THIOPHENE-2-CARBOXYLIC ACID 4-BROMO-BENZO[B]THIOPHENE-2-CARBOXYLIC ACID 5194-37-6 C9H5BrO2S
taurodehydrocholate taurodehydrocholate 517-37-3 C26H39NO7S
2-chloro-5-(trifluoromethyl)pyridine-3-boronic acid 2-chloro-5-(trifluoromethyl)pyridine-3-boronic acid 536693-96-6 C6H4BClF3NO2
Bis-TBDMS-trans-calcipotriol Bis-TBDMS-trans-calcipotriol 112849-27-1 C39H68O3Si2
TRIS(2-BENZIMIDAZOLYLMETHYL)AMINE) TRIS(2-BENZIMIDAZOLYLMETHYL)AMINE) 64019-57-4 C24H21N7
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
6-Hydroxy-N,2-dimethylbenzofuran-3-carboxamide 6-Hydroxy-N,2-dimethylbenzofuran-3-carboxamide 638217-08-0 C11H11NO3
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-Bromo-6-chloroquinoline 2-Bromo-6-chloroquinoline 891842-50-5 C9H5BrClN
4-tert-butyl-1H-pyrazole 4-tert-butyl-1H-pyrazole 105285-21-0 C7H12N2
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
6-chloro-4-methyl-2H-pyridazin-3-one 6-chloro-4-methyl-2H-pyridazin-3-one 1834-27-1 C5H5ClN2O
3,4,5-TRIBROMOPYRIDINE 3,4,5-TRIBROMOPYRIDINE 2457-48-9 C5H2Br3N
2-CYANO-3-(3-PYRIDINYL)ACRYLIC ACID 2-CYANO-3-(3-PYRIDINYL)ACRYLIC ACID 103029-74-9 C9H6N2O2
6-(2,2,2-TRIFLUOROETHOXY)PYRIDINE-3-CARBONITRILE 6-(2,2,2-TRIFLUOROETHOXY)PYRIDINE-3-CARBONITRILE 159981-18-7 C8H5F3N2O
2-Chloropyrimidine-5-carbaldehyde 2-Chloropyrimidine-5-carbaldehyde 933702-55-7 C5H3ClN2O
6-(1-Bromoethyl)-4-chloro-5-fluoropyrimidine 6-(1-Bromoethyl)-4-chloro-5-fluoropyrimidine 188416-28-6 C6H5BrClFN2
4-(2-(5-Ethyl-2-pyridyl)ethoxy)nitrobenzene 4-(2-(5-Ethyl-2-pyridyl)ethoxy)nitrobenzene 85583-54-6 C15H16N2O3
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
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
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
thiophen-3-amine oxalate thiophen-3-amine oxalate 861965-63-1 C6H7NO4S
2,6-Dibromopyrazine 2,6-Dibromopyrazine 23229-25-6 C4H2Br2N2
2-Pyridinethiol 1-oxide 2-Pyridinethiol 1-oxide 1121-31-9 C5H5NOS
PYRIDINE, 2-CHLORO-4-HYDRAZINO- PYRIDINE, 2-CHLORO-4-HYDRAZINO- 700811-29-6 C5H6ClN3
4-Phenyl-1,2,3,6-tetrahydropyridine hydrochloride 4-Phenyl-1,2,3,6-tetrahydropyridine hydrochloride 43064-12-6 C11H14ClN
2,3-DICHLORO-5-FORMYLPYRIDINE 2,3-DICHLORO-5-FORMYLPYRIDINE 71690-05-6 C6H3Cl2NO
4-AMINO-3,5-DIBROMO-2-METHYLPYRIDINE 4-AMINO-3,5-DIBROMO-2-METHYLPYRIDINE 126325-54-0 C6H6Br2N2
(6-AMINO-3-PYRIDINYL)METHANOL (6-AMINO-3-PYRIDINYL)METHANOL 113293-71-3 C6H8N2O
(4-CHLORO-BENZYL)-PYRIDIN-3-YLMETHYL-AMINE (4-CHLORO-BENZYL)-PYRIDIN-3-YLMETHYL-AMINE 212392-65-9 C13H13ClN2
2-chloro-6,7-dihydro-5H-pyrrolo[3,4-b]pyridine 2-chloro-6,7-dihydro-5H-pyrrolo[3,4-b]pyridine 810668-57-6 C7H7ClN2
3-Methoxy-5-nitropyridin-2-ol 3-Methoxy-5-nitropyridin-2-ol 75710-99-5 C6H6N2O4
5-CYANO-3-PYRIDINECARBOXYLIC ACID METHYL ESTER 5-CYANO-3-PYRIDINECARBOXYLIC ACID METHYL ESTER 106726-82-3 C8H6N2O2
6-BROMO-2,2'-BIPYRIDINE 6-BROMO-2,2'-BIPYRIDINE 10495-73-5 C10H7BrN2
2,5-DICHLORO-3-(4,4,5,5-TETRAMETHYL-[1,3,2]-DIOXABOROLAN-2-YL)PYRIDINE 2,5-DICHLORO-3-(4,4,5,5-TETRAMETHYL-[1,3,2]-DIOXABOROLAN-2-YL)PYRIDINE 1073371-98-8 C11H14BCl2NO2
2H-Pyrido[3,2-b][1,4]oxazin-3(4H)-one 2H-Pyrido[3,2-b][1,4]oxazin-3(4H)-one 20348-09-8 C7H6N2O2
5,7-Dibromo-2,3-dihydrothieno[3,4-b][1,4]dioxine 5,7-Dibromo-2,3-dihydrothieno[3,4-b][1,4]dioxine 174508-31-7 C6H4Br2O2S
2-(Chloromethyl)thiophene 2-(Chloromethyl)thiophene 765-50-4 C5H5ClS
5-BROMOPYRAZINE-2-CARBONITRILE 5-BROMOPYRAZINE-2-CARBONITRILE 221295-04-1 C5H2BrN3
4H-PYRIDO[1,2-A]PYRIMIDIN-4-ONE, 7-METHYL-2-(4-MORPHOLINYL)-9-[1-(PHENYLAMINO)ETHYL]- 4H-PYRIDO[1,2-A]PYRIMIDIN-4-ONE, 7-METHYL-2-(4-MORPHOLINYL)-9-[1-(PHENYLAMINO)ETHYL]- 663619-89-4 C21H24N4O2
2-CHLORO-5H-PYRROLO[3,2-D]PYRIMIDINE 2-CHLORO-5H-PYRROLO[3,2-D]PYRIMIDINE 1119280-66-8 C6H4ClN3
5-CHLORO-3-CYANOPYRIDINE 5-CHLORO-3-CYANOPYRIDINE 51269-82-0 C6H3ClN2
5-bromo-2-methoxy-3-(trifluoromethyl)pyridine 5-bromo-2-methoxy-3-(trifluoromethyl)pyridine 1214377-42-0 C7H5BrF3NO
4-METHOXYPYRIDINE-2-CARBONITRILE 4-METHOXYPYRIDINE-2-CARBONITRILE 36057-44-0 C7H6N2O
4-(AMINOMETHYL)-PYRIMIDINE 4-(AMINOMETHYL)-PYRIMIDINE 45588-79-2 C5H7N3
4-(4-METHOXYPHENYL)-6-(TRIFLUOROMETHYL)PYRIMIDIN-2-AMINE 4-(4-METHOXYPHENYL)-6-(TRIFLUOROMETHYL)PYRIMIDIN-2-AMINE 519056-51-0 C12H10F3N3O
4-BROMO-TETRAHYDROPYRAN 4-BROMO-TETRAHYDROPYRAN 25637-16-5 C5H9BrO
3-BROMO-2-FLUORO-4-IODOPYRIDINE 3-BROMO-2-FLUORO-4-IODOPYRIDINE 884494-52-4 C5H2BrFIN
5-BROMO-4,6-DIMETHYL-2-OXO-1,2-DIHYDRO-3-PYRIDINECARBONITRILE 5-BROMO-4,6-DIMETHYL-2-OXO-1,2-DIHYDRO-3-PYRIDINECARBONITRILE 23819-87-6 C8H7BrN2O
3,4-DIFLUOROPYRIDINE 3,4-DIFLUOROPYRIDINE 82878-63-5 C5H3F2N
5-(4-CHLOROPHENYL)PYRIMIDIN-4-AMINE 5-(4-CHLOROPHENYL)PYRIMIDIN-4-AMINE 35202-25-6 C10H8ClN3
6-(DIMETHYLAMINO)NICOTINONITRILE 6-(DIMETHYLAMINO)NICOTINONITRILE 154924-17-1 C8H9N3
3-AMINO-2-(METHYLAMINO)-5-(TRIFLUOROMETHYL)PYRIDINE 3-AMINO-2-(METHYLAMINO)-5-(TRIFLUOROMETHYL)PYRIDINE 172648-55-4 C7H8F3N3
2-DIPHENYLPHOSPHINO-6-METHYLPYRIDINE 2-DIPHENYLPHOSPHINO-6-METHYLPYRIDINE 132682-77-0 C18H16NP
PYRIDINE-2-SULFONIC ACID PYRIDINE-2-SULFONIC ACID 15103-48-7 C5H5NO3S
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