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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
4,6'-DICHLORO-2,2'-BIPYRIDINE 4,6'-DICHLORO-2,2'-BIPYRIDINE 85591-65-7 C10H6Cl2N2
5-Methyl-1H-hexahydropyrrolo[3,4-b]pyrrole 5-Methyl-1H-hexahydropyrrolo[3,4-b]pyrrole 132414-59-6 C7H14N2
2-Hydroxy-6-methyl-pyrimidine-4-carboxylic acidhydrochloride 2-Hydroxy-6-methyl-pyrimidine-4-carboxylic acidhydrochloride 1185300-30-4 C6H7ClN2O3
5-Fluoro-1H-pyrrolo[2,3-b]pyridine-3-carbaldehyde 5-Fluoro-1H-pyrrolo[2,3-b]pyridine-3-carbaldehyde 1171920-17-4 C8H5FN2O
4-(2-chloropyridin-3-yl)morpholine 4-(2-chloropyridin-3-yl)morpholine 54231-44-6 C9H11ClN2O
5-bromo-2-(3-(trifluoromethyl)phenyl)pyridine 5-bromo-2-(3-(trifluoromethyl)phenyl)pyridine 1215073-37-2 C12H7BrF3N
5-(4-fluorophenyl)pyridine-3-boronic acid pinacol ester 5-(4-fluorophenyl)pyridine-3-boronic acid pinacol ester 1105663-88-4 C17H19BFNO2
6-Bromo-5-fluoro-2-pyridinecarboxylic acid 6-Bromo-5-fluoro-2-pyridinecarboxylic acid 1052714-46-1 C6H3BrFNO2
2-(4-(trifluoromethyl)phenyl)oxazolo[4,5-c]quinolin-4(5H)-one 2-(4-(trifluoromethyl)phenyl)oxazolo[4,5-c]quinolin-4(5H)-one 2231827-83-9 C17H9F3N2O2
2-(Methoxycarbonyl)pyridine-4-boronic acid 2-(Methoxycarbonyl)pyridine-4-boronic acid 1150114-30-9 C7H8BNO4
Ethyl 2-bromooxazole-5-carboxylate Ethyl 2-bromooxazole-5-carboxylate 1060816-22-9 C6H6BrNO3
1-(5-bromopyridin-3-yl)-4-methylpiperazine 1-(5-bromopyridin-3-yl)-4-methylpiperazine 1130759-48-6 C10H14BrN3
2-Methoxy-3-methyl-5-(4,4,5,5-tetramethyl-[1,3,2]dioxaborolan-2-yl)-pyridine 2-Methoxy-3-methyl-5-(4,4,5,5-tetramethyl-[1,3,2]dioxaborolan-2-yl)-pyridine 1083168-83-5 C13H20BNO3
6-fluoro-2,4'-bipyridine 6-fluoro-2,4'-bipyridine 1214360-31-2 C10H7FN2
2-fluoro-6-(4-(trifluoromethyl)phenyl)pyridine 2-fluoro-6-(4-(trifluoromethyl)phenyl)pyridine 180606-18-2 C12H7F4N
Estra-1,3,5(10)-triene-3,17-diol,7-[9-[(4,4,5,5,5-pentafluoropentyl)thio]nonyl]-,17-acetate,(7a,17b)- Estra-1,3,5(10)-triene-3,17-diol,7-[9-[(4,4,5,5,5-pentafluoropentyl)thio]nonyl]-,17-acetate,(7a,17b)- 875573-69-6 C34H49F5O3S
3-(1H-imidazol-1-yl)-5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridine 3-(1H-imidazol-1-yl)-5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridine 1201644-45-2 C14H18BN3O2
5-(thiophen-3-yl)pyridin-2-amine 5-(thiophen-3-yl)pyridin-2-amine 892282-90-5 C9H8N2S
thiazol-4-amine thiazol-4-amine 17720-99-9 C3H4N2S
Antiproliferative agent-71 Antiproliferative agent-71 3083307-42-7 C50H54N10O5S
4,6-Difluoroindole-2-carboxylic acid 4,6-Difluoroindole-2-carboxylic acid 247564-66-5 C9H5F2NO2
4-(3-METHYLPHENYL)-1,3-THIAZOLE 4-(3-METHYLPHENYL)-1,3-THIAZOLE 383145-33-3 C10H9NS
(23S)-22,23-Dihydro-23-hydroxyavermectin A1a (23S)-22,23-Dihydro-23-hydroxyavermectin A1a 65195-53-1 C49H76O15
coccinelline coccinelline 34290-97-6 C13H23NO
35-O-(2,6-Dideoxy-L-ribo-hexopyranosyl)nystatin A1 35-O-(2,6-Dideoxy-L-ribo-hexopyranosyl)nystatin A1
2-(PIPERIDIN-1-YL)-4,6-DICHLOROPYRIMIDINE 2-(PIPERIDIN-1-YL)-4,6-DICHLOROPYRIMIDINE 7038-67-7 C9H11Cl2N3
2-CHLORO-6-[4-(TRIFLUOROMETHYL)PHENYL]PYRAZINE 2-CHLORO-6-[4-(TRIFLUOROMETHYL)PHENYL]PYRAZINE 637352-84-2 C11H6ClF3N2
4-(3-BROMOPYRIDIN-5-YL)PYRIDINE 4-(3-BROMOPYRIDIN-5-YL)PYRIDINE 106047-38-5 C10H7BrN2
5-(4-bromopyridin-3-yl)thiazole 5-(4-bromopyridin-3-yl)thiazole 3124621-23-1 C8H5BrN2S
methyl 5-bromo-6-fluoro-2-methylbenzo[b]thiophene-3-carboxylate methyl 5-bromo-6-fluoro-2-methylbenzo[b]thiophene-3-carboxylate C11H8BrFO2S
2-(pyridin-3-yl)pyridin-3-amine 2-(pyridin-3-yl)pyridin-3-amine 170808-76-1 C10H9N3
tert-butyl 4-(2-chloropyrimidin-4-yl)piperidine-1-carboxylate tert-butyl 4-(2-chloropyrimidin-4-yl)piperidine-1-carboxylate 1001754-82-0 C14H20ClN3O2
2,4-dibromothiazole 2,4-dibromothiazole 960069-34-5 C3HBr2NS
4-chloro-6-cyclopropylpyrimidine(SALTDATA: FREE) 4-chloro-6-cyclopropylpyrimidine(SALTDATA: FREE) 7038-76-8 C7H7ClN2
2,4-Dichloro-5-(trifluoromethyl)pyridine 2,4-Dichloro-5-(trifluoromethyl)pyridine 888327-38-6 C6H2Cl2F3N
[1-(2-Chloro-pyrimidin-4-yl)-piperidin-2-yl]-methanol [1-(2-Chloro-pyrimidin-4-yl)-piperidin-2-yl]-methanol 1250197-70-6 C10H14ClN3O
6-Chloro-5-hydroxy-nicotinic acid methyl ester 6-Chloro-5-hydroxy-nicotinic acid methyl ester 915107-30-1 C7H6ClNO3
tert-butyl 8-oxo-3-azabicyclo[3.2.1]octane-3-carboxylate tert-butyl 8-oxo-3-azabicyclo[3.2.1]octane-3-carboxylate 637301-19-0 C12H19NO3
2-chloro-5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)nicotinonitrile 2-chloro-5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)nicotinonitrile 1220220-02-9 C12H14BClN2O2
5-BroMo-2-fluorothiophene 5-BroMo-2-fluorothiophene 32415-41-1 C4H2BrFS
3-BroMo-2,4-diMethoxy-pyridine 3-BroMo-2,4-diMethoxy-pyridine 96246-00-3 C7H8BrNO2
5-(2-Methoxyphenyl)pyridin-3-aMine 5-(2-Methoxyphenyl)pyridin-3-aMine 1224740-84-4 C12H12N2O
5-(4-aMinophenyl)pyridin-3-aMine 5-(4-aMinophenyl)pyridin-3-aMine 1258626-25-3 C11H11N3
5-(3,4-difluorophenyl)pyridin-3-aMine 5-(3,4-difluorophenyl)pyridin-3-aMine 1226415-43-5 C11H8F2N2
4-(3-Methoxyphenyl)pyrimidin-2-amine 4-(3-Methoxyphenyl)pyrimidin-2-amine 1158235-36-9 C11H11N3O
4-(4,4,5,5-Tetramethyl-1,3,2-dioxaborolan-2-yl)pyridin-2-ol 4-(4,4,5,5-Tetramethyl-1,3,2-dioxaborolan-2-yl)pyridin-2-ol 1256358-90-3 C11H16BNO3
3-(2-chlorophenyl)pyridin-4-aMine 3-(2-chlorophenyl)pyridin-4-aMine 1258624-38-2 C11H9ClN2
3,3'-bipyridin-4-aMine 3,3'-bipyridin-4-aMine 1214333-30-8 C10H9N3
5-butylthiazol-2-aMine 5-butylthiazol-2-aMine 39136-62-4 C7H12N2S
6-broMo-2,3'-bipyridine 6-broMo-2,3'-bipyridine 106047-28-3 C10H7BrN2
1,2,5-Trimethyl-3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyrrole 1,2,5-Trimethyl-3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyrrole 1256359-32-6 C13H22BNO2
(2S)-2-(2,6-Dichlorophenyl)-1-[(1R)-1-phenylethyl]-4-imidazolidinone (2S)-2-(2,6-Dichlorophenyl)-1-[(1R)-1-phenylethyl]-4-imidazolidinone 1004754-99-7 C17H16Cl2N2O
3-Methyl-5-(4,4,5,5-tetraMethyl-1,3,2-dioxaborolan-2-yl)pyridin-2-ol 3-Methyl-5-(4,4,5,5-tetraMethyl-1,3,2-dioxaborolan-2-yl)pyridin-2-ol 1375302-98-9 C12H18BNO3
bk-DMBDB (hydrochloride) bk-DMBDB (hydrochloride) 17763-12-1 C13H18ClNO3
1-(1-Methylethyl)-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-imidazole 1-(1-Methylethyl)-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-imidazole 2223012-45-9 C12H21BN2O2
10-deoxymethynolide 10-deoxymethynolide 81644-19-1 C17H28O4
9H-Purin-6-amine, 9-[2,5-anhydro-6-deoxy-4-C-(hydroxymethyl)-α-L-mannofuranosyl]- 9H-Purin-6-amine, 9-[2,5-anhydro-6-deoxy-4-C-(hydroxymethyl)-α-L-mannofuranosyl]- 1197033-34-3 C12H15N5O4
Benzo[d]Isothiazole Benzo[d]Isothiazole 272-16-2 C7H5NS
2-(4-(trifluoromethyl)phenyl)thiazole 2-(4-(trifluoromethyl)phenyl)thiazole 1005196-13-3 C9H6FNS
(2R,3S)-2-((R)-1-(3,5-Bis(trifluoromethyl)phenyl)ethoxy)-3-(4-fluorophenyl)morpholine hydrochloride (2R,3S)-2-((R)-1-(3,5-Bis(trifluoromethyl)phenyl)ethoxy)-3-(4-fluorophenyl)morpholine hydrochloride 171482-05-6 C20H19ClF7NO2
4-PIPERIDINE-D9-CARBOXYLIC ACID 4-PIPERIDINE-D9-CARBOXYLIC ACID 1219798-43-2 C6H2D9NO2
1-(4-Bromo-phenyl)-1,3-dihydro-imidazol-2-one
1-(4-Bromo-phenyl)-1,3-dihydro-imidazol-2-one 530080-83-2 C9H7BrN2O
7,8,9,10-Tetrahydro-8-(trifluoroacetyl)-6,10-methano-6H-pyrazino[2,3-h][3]benzazepine (N-(Trifluoroacetyl)varenicline) 7,8,9,10-Tetrahydro-8-(trifluoroacetyl)-6,10-methano-6H-pyrazino[2,3-h][3]benzazepine (N-(Trifluoroacetyl)varenicline) 230615-70-0 C15H12F3N3O
6-(TERT-BUTYL)PYRIDINE-2-BORONIC ACID PINACOL ESTER 6-(TERT-BUTYL)PYRIDINE-2-BORONIC ACID PINACOL ESTER 1264141-60-7 C15H24BNO2
6-BOC-3,6-DIAZABICYCLO[3.2.0]HEPTANE 6-BOC-3,6-DIAZABICYCLO[3.2.0]HEPTANE 122848-57-1 C10H18N2O2
4-(pyrrolidin-1-yl)pyrimidin-2-amine 4-(pyrrolidin-1-yl)pyrimidin-2-amine 1215986-09-6 C8H12N4
5-(piperidin-1-yl)pyridin-2-amine 5-(piperidin-1-yl)pyridin-2-amine 94924-94-4 C10H15N3
tert-butyl 6-oxo-1,4-oxazepane-4-carboxylate tert-butyl 6-oxo-1,4-oxazepane-4-carboxylate 748805-97-2 C10H17NO4
2-(cyclohexyloxy)pyridin-3-amine 2-(cyclohexyloxy)pyridin-3-amine 147143-56-4 C11H16N2O
1-BENZYL-PYRROLIDINE-3-CARBONITRILE 1-BENZYL-PYRROLIDINE-3-CARBONITRILE 10603-52-8 C12H14N2
4-(1H-imidazol-1-yl)pyridin-3-amine 4-(1H-imidazol-1-yl)pyridin-3-amine 145255-14-7 C8H8N4
4-(2-methyl-1H-imidazol-1-yl)pyridin-3-amine 4-(2-methyl-1H-imidazol-1-yl)pyridin-3-amine 1040314-53-1 C9H10N4
4-[2-(trifluoromethyl)phenyl]-1,3-thiazol-2-amine 4-[2-(trifluoromethyl)phenyl]-1,3-thiazol-2-amine 383129-63-3 C10H7F3N2S
(+)-(4S)-PHENYL-ALPHA-[(4S)-PHENYLOXAZOLIDIN-2-YLIDENE]-2-OXAZOLINE-2-ACETONITRILE (+)-(4S)-PHENYL-ALPHA-[(4S)-PHENYLOXAZOLIDIN-2-YLIDENE]-2-OXAZOLINE-2-ACETONITRILE 150639-33-1 C20H17N3O2
4-Chloro-N-methylpiperidine 4-Chloro-N-methylpiperidine 5570-77-4 C6H12ClN
1-(1-naphthylmethyl)quinolinium chloride 1-(1-naphthylmethyl)quinolinium chloride 65322-65-8 C20H16ClN
2-Thiazolamine,  5-(1,1-dimethylethyl)- 2-Thiazolamine, 5-(1,1-dimethylethyl)- 299417-31-5 C7H12N2S
2-AMINO-5-METHOXYPYRAZINE 2-AMINO-5-METHOXYPYRAZINE 54013-07-9 C5H7N3O
4-Piperidin-1-ylpyridin-2-amine 4-Piperidin-1-ylpyridin-2-amine 52311-35-0 C10H15N3
1H-Pyrazole-5-carboxamide, N-[(1S)-2,2-dicyclopropyl-1-[[[4-[(1S,2R)-3-[(3R)-3,4-dimethyl-1-piperazinyl]-2-[[(2S)-2-methoxy-1-oxopropyl]amino]-1-methyl-3-oxopropyl]-2-fluorophenyl]amino]carbonyl]ethyl]-1-ethyl- 1H-Pyrazole-5-carboxamide, N-[(1S)-2,2-dicyclopropyl-1-[[[4-[(1S,2R)-3-[(3R)-3,4-dimethyl-1-piperazinyl]-2-[[(2S)-2-methoxy-1-oxopropyl]amino]-1-methyl-3-oxopropyl]-2-fluorophenyl]amino]carbonyl]ethyl]-1-ethyl- 2978700-29-5 C35H50FN7O5
2,3-Diaminobenzoic acid 2,3-Diaminobenzoic acid 603-81-6 C7H8N2O2
4,6-Dimethyl-2-methylsulfonylpyrimidine 4,6-Dimethyl-2-methylsulfonylpyrimidine 35144-22-0 C7H10N2O2S
2-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-6-(vinyl-d3)pyrazine-3,5-d2 2-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-6-(vinyl-d3)pyrazine-3,5-d2 3124423-79-3
2-bromo-6-cyclopropylpyrazine-3,5-d2 2-bromo-6-cyclopropylpyrazine-3,5-d2 3124707-98-5
5-(ethyl-d5)pyrazin-3,6-d2-2-amine 5-(ethyl-d5)pyrazin-3,6-d2-2-amine 3124708-38-6
5-(oxetan-3-yl)pyrazin-3,6-d2-2-ol 5-(oxetan-3-yl)pyrazin-3,6-d2-2-ol 3124708-69-3
tert-butyl 3-(6-oxo-1,6-dihydropyrazin-2-yl-3,5-d2)azetidine-1-carboxylate-2,2,3,4,4-d5 tert-butyl 3-(6-oxo-1,6-dihydropyrazin-2-yl-3,5-d2)azetidine-1-carboxylate-2,2,3,4,4-d5 3124709-30-1
tert-butyl 3-(5-oxo-4,5-dihydropyrazin-2-yl-3,6-d2)azetidine-1-carboxylate tert-butyl 3-(5-oxo-4,5-dihydropyrazin-2-yl-3,6-d2)azetidine-1-carboxylate 3124709-35-6
2-bromo-6-(bromomethyl-d2)pyrazine-3,5-d2 2-bromo-6-(bromomethyl-d2)pyrazine-3,5-d2 3124620-14-7
5-Amino-2-(4'-hydroxymethyl-2'-pyridyl)pyrazine 5-Amino-2-(4'-hydroxymethyl-2'-pyridyl)pyrazine 1185308-82-0
5-Amino-6'-hydroxy-2,2'-bipyrazine 5-Amino-6'-hydroxy-2,2'-bipyrazine 1185312-84-8 C8H7N5O
2-Chloro-4-methyl-6-(5'-amino-2'-pyrazinyl)pyrimidine 2-Chloro-4-methyl-6-(5'-amino-2'-pyrazinyl)pyrimidine 1185317-39-8
2-Chloro-4,5'-diamino-6-(2'-pyrazinyl)pyrimidine 2-Chloro-4,5'-diamino-6-(2'-pyrazinyl)pyrimidine 1185312-55-3
5-Chloro-2-(4'-amino-2'-pyridyl)pyrazine 5-Chloro-2-(4'-amino-2'-pyridyl)pyrazine 1185318-91-5 C9H7ClN4
2,4'-Diamino-4-(2'-pyridyl)thiazole 2,4'-Diamino-4-(2'-pyridyl)thiazole 1185319-07-6 C8H8N4S
6-Chloro-2-(methylthio)-4-(4'-amino-2'-pyridyl)pyrimidine 6-Chloro-2-(methylthio)-4-(4'-amino-2'-pyridyl)pyrimidine 1185319-43-0 C10H9ClN4S
2,6-Dichloro-4-(4'-amino-2'-pyridyl)triazine 2,6-Dichloro-4-(4'-amino-2'-pyridyl)triazine 1185313-58-9 C8H5Cl2N5
2-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-5-vinylpyrazine 2-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-5-vinylpyrazine 3124585-56-1
2-PYRIDIN-4-YL-THIAZOL-4-YLAMINE 2-PYRIDIN-4-YL-THIAZOL-4-YLAMINE 89401-67-2 C8H7N3S
4-CYCLOHEXYL-1,3-THIAZOL-2-AMINE 4-CYCLOHEXYL-1,3-THIAZOL-2-AMINE 7496-55-1 C9H14N2S
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