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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
2-Hydroxy-3-methylpyrazine 2-Hydroxy-3-methylpyrazine 19838-07-4 C5H6N2O
6-METHYLPYRAZINE-2-CARBOXYLIC ACID 6-METHYLPYRAZINE-2-CARBOXYLIC ACID 5521-61-9 C6H6N2O2
1-Methyl-1H-indole-6-carbaldehyde 1-Methyl-1H-indole-6-carbaldehyde 21005-45-8 C10H9NO
3-Prop-2-ynoxypropane-1,2-diol 3-Prop-2-ynoxypropane-1,2-diol 13580-38-6 C6H10O3
thieno[3,2-c]pyridine thieno[3,2-c]pyridine 272-14-0 C7H5NS
1-METHYL-4-(PIPERIDIN-4-YL)-PIPERAZINE 1-METHYL-4-(PIPERIDIN-4-YL)-PIPERAZINE 53617-36-0 C10H21N3
1222102-49-9 1222102-49-9 1222102-49-9 C9H18N2O2
(R)-2-(2-fluoroethyl)piperazine dihydrochloride (R)-2-(2-fluoroethyl)piperazine dihydrochloride
2-Bromo-6-fluoro-7-methyl-5H-[1,3,4]thiadiazolo[3,2-a]pyrimidin-5-one 2-Bromo-6-fluoro-7-methyl-5H-[1,3,4]thiadiazolo[3,2-a]pyrimidin-5-one 1352052-18-6 C6H3BrFN3OS
4-CHLORO (1H)INDAZOLE 4-CHLORO (1H)INDAZOLE 13096-96-3 C7H5ClN2
(2R,5R)-1,2,5-trimethylpiperazine (2R,5R)-1,2,5-trimethylpiperazine 1152368-00-7 C7H16N2
2-Bromo-3′-hydroxyacetophenone 2-Bromo-3′-hydroxyacetophenone 2491-37-4 C8H7BrO2
2-bromo-4-phenylpyrimidine 2-bromo-4-phenylpyrimidine 10198-98-8 C10H7BrN2
7-Azaindole-4-carboxylic acid 7-Azaindole-4-carboxylic acid 479553-01-0 C8H6N2O2
4-CHLORO-6-IODOQUINOLINE 4-CHLORO-6-IODOQUINOLINE 40107-07-1 C9H5ClIN
5-BROMO-1H-PYRAZOLO[3,4-B]PYRIDIN-3-YLAMINE 5-BROMO-1H-PYRAZOLO[3,4-B]PYRIDIN-3-YLAMINE 405224-24-0 C6H5BrN4
(R)-3-Isopropyl-2,5-piperazinedione (R)-3-Isopropyl-2,5-piperazinedione 143673-66-9 C7H12N2O2
5-CHLORO INDAZOLE-3-CARBOXALDEHYDE 5-CHLORO INDAZOLE-3-CARBOXALDEHYDE 102735-84-2 C8H5ClN2O
7-chloro-1H-imidazo[4,5-b]pyridine 7-chloro-1H-imidazo[4,5-b]pyridine 6980-11-6 C6H4ClN3
PIPERIDIN-4-YL-ACETIC ACID METHYL ESTER HYDROCHLORIDE
PIPERIDIN-4-YL-ACETIC ACID METHYL ESTER HYDROCHLORIDE 81270-37-3 C8H16ClNO2
5-Chlorothiophene-2-ylmethanol 5-Chlorothiophene-2-ylmethanol 74168-69-7 C5H5ClOS
2,3,3-Trimethyl-3H-indole-5-sulfonic acid 2,3,3-Trimethyl-3H-indole-5-sulfonic acid 132557-72-3 C11H13NO3S
4-CHLORO-3-IODO-1H-PYRROLO[2,3-B]PYRIDINE 4-CHLORO-3-IODO-1H-PYRROLO[2,3-B]PYRIDINE 869335-73-9 C7H4ClIN2
2'-Deoxy-2'-fluoroinosine 2'-Deoxy-2'-fluoroinosine 80049-87-2 C10H11FN4O4
1-cyclopropyl-7-(2,8-diazabicyclo[4.3.0]non-8-yl)-6-fluoro-8-methoxy-4 -oxo-quinoline-3-carboxylic acid 1-cyclopropyl-7-(2,8-diazabicyclo[4.3.0]non-8-yl)-6-fluoro-8-methoxy-4 -oxo-quinoline-3-carboxylic acid 354812-41-2 C21H24FN3O4
1H-Indol-4-amine,6-fluoro-(9CI) 1H-Indol-4-amine,6-fluoro-(9CI) 885518-25-2 C8H7FN2
1-fluoropyridine trifluoromethyl sulfonate 1-fluoropyridine trifluoromethyl sulfonate
4-METHOXY-1H-INDAZOL-3-AMINE 4-METHOXY-1H-INDAZOL-3-AMINE 886362-07-8 C8H9N3O
xylocytidine xylocytidine 3530-56-1 C9H13N3O5
5-BROMO-2-METHOXY-3-METHYLPYRIDINE 5-BROMO-2-METHOXY-3-METHYLPYRIDINE 760207-87-2 C7H8BrNO
4-CHLORO-7-BROMOINDOLE 4-CHLORO-7-BROMOINDOLE 126811-29-8 C8H5BrClN
7-bromo-[1,2,4]triazolo[1,5-a]pyridin-2-amine 7-bromo-[1,2,4]triazolo[1,5-a]pyridin-2-amine 882521-63-3 C6H5BrN4
4,6-Dichloro-1H-pyrrolo[2,3-b]pyridine 4,6-Dichloro-1H-pyrrolo[2,3-b]pyridine 5912-18-5 C7H4Cl2N2
Dimethyl  Furan-2,5-dicarboxylate Dimethyl Furan-2,5-dicarboxylate 4282-32-0 C8H8O5
thiadiazole thiadiazole 288-48-2 C2H2N2S
2,3-DIHYDRO-2-THIOXO-PYRIDO[3,4-D]PYRIMIDIN-4(1H)-ONE 2,3-DIHYDRO-2-THIOXO-PYRIDO[3,4-D]PYRIMIDIN-4(1H)-ONE 412341-42-5 C7H5N3OS
TERT-BUTYL 3-OXO-2,8-DIAZASPIRO[4.5]DECANE-8-CARBOXYLATE TERT-BUTYL 3-OXO-2,8-DIAZASPIRO[4.5]DECANE-8-CARBOXYLATE 169206-67-1 C13H22N2O3
1-Methyl-4-[[4-nitro-2-(trifluoromethyl)phenyl]methyl]-piperazine 1-Methyl-4-[[4-nitro-2-(trifluoromethyl)phenyl]methyl]-piperazine 694499-24-6 C13H16F3N3O2
5-Methylpyridine-2,3-dicarboxylic acid dimethyl ester 5-Methylpyridine-2,3-dicarboxylic acid dimethyl ester 112110-16-4 C10H11NO4
(Z)-Methyl 2-ethoxy-3-((2'-(N'-hydroxycarbaMiMidoyl)biphenyl-4-yl)Methyl)-3H-benzo[d] iMidazole-4-carboxylate (Z)-Methyl 2-ethoxy-3-((2'-(N'-hydroxycarbaMiMidoyl)biphenyl-4-yl)Methyl)-3H-benzo[d] iMidazole-4-carboxylate 147403-65-4 C25H24N4O4
(2R)-2-(Diphenylmethyl)pyrrolidine Hydrochloride (2R)-2-(Diphenylmethyl)pyrrolidine Hydrochloride 23627-61-4 C17H20ClN
(2-Chloro-5-iodophenyl)[4-[[(3S)-tetrahydro-3-furanyl]oxy]phenyl]methanone (2-Chloro-5-iodophenyl)[4-[[(3S)-tetrahydro-3-furanyl]oxy]phenyl]methanone 915095-87-3 C17H14ClIO3
5-(2-fluorophenyl)-1H-pyrrole-3-carbonitrile 5-(2-fluorophenyl)-1H-pyrrole-3-carbonitrile 1240948-77-9 C11H7FN2
4-fluoro-2-Methoxy-5-nitroaniline 4-fluoro-2-Methoxy-5-nitroaniline 1075705-01-9 C7H7FN2O3
tert-butyl 4-(2,2,2-trifluoroethyl)piperazine-1-carboxylate tert-butyl 4-(2,2,2-trifluoroethyl)piperazine-1-carboxylate 692058-21-2 C11H19F3N2O2
10-Hydroxybenzo[h]quinoline 10-Hydroxybenzo[h]quinoline 33155-90-7 C13H9NO
11,12-Dihydroindolo[2,3-a]carbazole 11,12-Dihydroindolo[2,3-a]carbazole 60511-85-5 C18H12N2
2-Chloro-4,5,7-trimethylquinoline 2-Chloro-4,5,7-trimethylquinoline 329210-71-1 C12H12ClN
2-(Trifluoromethoxy)benzyl alcohol 2-(Trifluoromethoxy)benzyl alcohol 175278-07-6 C8H7F3O2
5,6-Methylenedioxyindole 5,6-Methylenedioxyindole 267-48-1 C9H7NO2
1-Cyclopropyl-6,7-difluoro-1,4-dihydro-8-methoxy-4-oxo-3-quinolinecarboxylic acid 1-Cyclopropyl-6,7-difluoro-1,4-dihydro-8-methoxy-4-oxo-3-quinolinecarboxylic acid 112811-72-0 C14H11F2NO4
1-(4-Bromophenyl)piperazine 1-(4-Bromophenyl)piperazine 66698-28-0 C10H13BrN2
4-chloro-6-(1-methyl-1H-pyrazol-4-yl)pyrazolo[1,5-a]pyrazine 4-chloro-6-(1-methyl-1H-pyrazol-4-yl)pyrazolo[1,5-a]pyrazine 1940180-18-6 C10H8ClN5
ethyl (Z)-2-(ethoxymethylene)-4,4-difluoro-3-oxobutanoate ethyl (Z)-2-(ethoxymethylene)-4,4-difluoro-3-oxobutanoate 1086400-66-9 C9H12F2O4
6-Fluoroindole-2-carboxylic acid 6-Fluoroindole-2-carboxylic acid 3093-97-8 C9H6FNO2
2,2'-BIPYRIMIDINE 2,2'-BIPYRIMIDINE 34671-83-5 C8H6N4
4,6-DICHLORO-2-(4-FLUOROPHENYL)PYRIMIDINE 4,6-DICHLORO-2-(4-FLUOROPHENYL)PYRIMIDINE 83217-30-5 C10H5Cl2FN2
Tert-butyl 4-(6-nitropyridin-3-yl)piperazine-1-carboxylate Tert-butyl 4-(6-nitropyridin-3-yl)piperazine-1-carboxylate 571189-16-7 C14H20N4O4
(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
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
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
1-(1-Benzothiophen-4-yl)piperazine hydrochloride 1-(1-Benzothiophen-4-yl)piperazine hydrochloride 913614-18-3 C12H15ClN2S
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
(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-chloro-5-(2-fluorophenyl)-1H-pyrrole-3-carbonitrile 2-chloro-5-(2-fluorophenyl)-1H-pyrrole-3-carbonitrile 1240948-72-4 C11H6ClFN2
2-chloro-7-cyclopentyl-7H-pyrrolo[2,3-d]pyriMidine-6-carboxylic acid 2-chloro-7-cyclopentyl-7H-pyrrolo[2,3-d]pyriMidine-6-carboxylic acid 1211443-58-1 C12H12ClN3O2
phenyl hydrogen ((((R)-1-(6-amino-9H-purin-9-yl)propan-2-yl)oxy)methyl)phosphonate phenyl hydrogen ((((R)-1-(6-amino-9H-purin-9-yl)propan-2-yl)oxy)methyl)phosphonate 379270-35-6 C15H18N5O4P
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
5-BROMO-2-CHLOROQUINOLINE 5-BROMO-2-CHLOROQUINOLINE 99455-13-7 C9H5BrClN
2-Chloro-5-methyl-1,4-phenylenediamine 2-Chloro-5-methyl-1,4-phenylenediamine 5307-03-9 C7H9ClN2
5-CHLORO-3-METHYL-1-PHENYLPYRAZOLE 5-CHLORO-3-METHYL-1-PHENYLPYRAZOLE 1131-17-5 C10H9ClN2
Indole-3-carbinol Indole-3-carbinol 700-06-1 C9H9NO
5-isothiocyanato-3-(trifluoromethyl)picolinonitrile 5-isothiocyanato-3-(trifluoromethyl)picolinonitrile 951753-87-0 C8H2F3N3S
1-Bromodibenzothiophene 1-Bromodibenzothiophene 65642-94-6 C12H7BrS
5,7-Dichloro-1,2,3,4-Tetrahydroisoquinoline-6-Carboxylic Acid Hydrochloride 5,7-Dichloro-1,2,3,4-Tetrahydroisoquinoline-6-Carboxylic Acid Hydrochloride 1289646-93-0 C10H10Cl3NO2
Ethyl 2-amino-4-methyl-5-(4-nitrophenyl)thiophene-3-carboxylate Ethyl 2-amino-4-methyl-5-(4-nitrophenyl)thiophene-3-carboxylate 174072-89-0 C14H14N2O4S
2-AMINO-4,5,6,7-TETRAHYDRO-1-BENZOTHIOPHENE-3-CARBOXAMIDE 2-AMINO-4,5,6,7-TETRAHYDRO-1-BENZOTHIOPHENE-3-CARBOXAMIDE 4815-28-5 C9H12N2OS
1-Boc-4-piperidylacetic acid 1-Boc-4-piperidylacetic acid 157688-46-5 C12H21NO4
3,6-DIMETHOXYPYRIDAZINE 3,6-DIMETHOXYPYRIDAZINE 4603-59-2 C6H8N2O2
METHYL (2-AMINO-PHENYL)-ACETATE METHYL (2-AMINO-PHENYL)-ACETATE 35613-44-6 C9H11NO2
3-amino-5,7-dimethyl-2H-pyrazolo[3,4-d]pyrimidine-4,6-dione 3-amino-5,7-dimethyl-2H-pyrazolo[3,4-d]pyrimidine-4,6-dione 67304-67-0 C7H9N5O2
2-CHLORO-4-FLUOROIODOBENZENE 2-CHLORO-4-FLUOROIODOBENZENE 101335-11-9 C6H3ClFI
6-Bromo-4-methoxypyrazolo[1,5-a]pyridine-3-carboxylic acid 6-Bromo-4-methoxypyrazolo[1,5-a]pyridine-3-carboxylic acid 2089381-00-8 C9H7BrN2O3
6-METHOXY-3-METHYL-1H-INDAZOLE 6-METHOXY-3-METHYL-1H-INDAZOLE 7746-29-4 C9H10N2O
1,4-PIPERAZINEDICARBONYL CHLORIDE 1,4-PIPERAZINEDICARBONYL CHLORIDE 4858-84-8 C6H8Cl2N2O2
1,4-Piperazinedicarboxylic acid, 2-(hydroxymethyl)-, 1-(1,1-dimethylethyl) 4-(phenylmethyl) ester, (2S)- 1,4-Piperazinedicarboxylic acid, 2-(hydroxymethyl)-, 1-(1,1-dimethylethyl) 4-(phenylmethyl) ester, (2S)- 385802-84-6 C18H26N2O5
(S)-2-((trifluoromethoxy)methyl)piperazine dihydrochloride (S)-2-((trifluoromethoxy)methyl)piperazine dihydrochloride
4-(4-NITROPHENYL)MORPHOLIN-3-ONE 4-(4-NITROPHENYL)MORPHOLIN-3-ONE 446292-04-2 C10H10N2O4
2-METHANESULFONYL-PYRIMIDINE 2-METHANESULFONYL-PYRIMIDINE 14161-09-2 C5H6N2O2S
5-BROMO-1H-INDAZOLE-3-CARBOXYLIC ACID 5-BROMO-1H-INDAZOLE-3-CARBOXYLIC ACID 1077-94-7 C8H5BrN2O2
6-Methoxy-2-oxindole 6-Methoxy-2-oxindole 7699-19-6 C9H9NO2
TERT-BUTYL (4-OXOCYCLOHEXYL) METHYLCARBAMATE TERT-BUTYL (4-OXOCYCLOHEXYL) METHYLCARBAMATE 809273-70-9 C12H21NO3
4-HYDROXY-2-METHYLPYRIMIDINE-5-CARBOXYLIC ACID 4-HYDROXY-2-METHYLPYRIMIDINE-5-CARBOXYLIC ACID 18529-69-6 C6H6N2O3
1-(4-Hydroxyphenyl)piperazine 1-(4-Hydroxyphenyl)piperazine 56621-48-8 C10H14N2O
4-(difluoromethyl)pyrimidin-2-amine 4-(difluoromethyl)pyrimidin-2-amine 1780891-13-5 C5H5F2N3
4,6-dimethoxy-2-methyl-5-nitropyrimidine 4,6-dimethoxy-2-methyl-5-nitropyrimidine 29939-34-2 C7H9N3O4
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