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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
Benzenamine, 2-fluoro-3-methyl-4-([1,2,4]triazolo[1,5-a]pyridin-7-yloxy)- Benzenamine, 2-fluoro-3-methyl-4-([1,2,4]triazolo[1,5-a]pyridin-7-yloxy)- 2387518-94-5 C13H11FN4O
tert-butyl  4-[2-(2,6-dioxo-3-piperidyl)-6-fluoro-1,3-dioxo-isoindolin-5-yl]piperazine-1-carboxyl ate tert-butyl 4-[2-(2,6-dioxo-3-piperidyl)-6-fluoro-1,3-dioxo-isoindolin-5-yl]piperazine-1-carboxyl ate
3-BROMO-1H-PYRAZOLO[3,4-D]PYRIMIDIN-4-OL 3-BROMO-1H-PYRAZOLO[3,4-D]PYRIMIDIN-4-OL 54738-73-7 C5H3BrN4O
4-BROMO-2,5-DIMETHYLANILINE 4-BROMO-2,5-DIMETHYLANILINE 30273-40-6 C8H10BrN
2-CHLORO-4-METHYL-6-(TRIFLUOROMETHYL)PYRIMIDINE 2-CHLORO-4-METHYL-6-(TRIFLUOROMETHYL)PYRIMIDINE 241164-09-0 C6H4ClF3N2
Methyl 3-nitrophenylacetate Methyl 3-nitrophenylacetate 10268-12-9 C9H9NO4
6-BROMO-4-CHLOROPYRROLO[1,2-F][1,2,4]TRIAZINE 6-BROMO-4-CHLOROPYRROLO[1,2-F][1,2,4]TRIAZINE 916420-30-9 C6H3BrClN3
6-METHOXY-2-METHYL-1H-INDOLE 6-METHOXY-2-METHYL-1H-INDOLE 1968-13-4 C10H11NO
2-Azabicyclo[2.1.1]hexane-2-carboxylic acid, 5-amino-, 1,1-dimethylethyl ester, (1R,4R,5S)- 2-Azabicyclo[2.1.1]hexane-2-carboxylic acid, 5-amino-, 1,1-dimethylethyl ester, (1R,4R,5S)- 1932212-66-2 C10H18N2O2
G6PD activator AG1 G6PD activator AG1 421581-52-4 C24H30N4S2
3,6-Diazabicyclo[3.1.1]heptane, 6-[(6-methoxy-3-pyridinyl)methyl]- 3,6-Diazabicyclo[3.1.1]heptane, 6-[(6-methoxy-3-pyridinyl)methyl]- 2306275-33-0 C12H17N3O
4H-Cyclopentapyrimidin-4-one, 2-chloro-1,5,6,7-tetrahydro- (9CI) 4H-Cyclopentapyrimidin-4-one, 2-chloro-1,5,6,7-tetrahydro- (9CI) 178308-48-0 C7 H7 Cl N2 O
Pyrroloquinoline quinone disodium salt Pyrroloquinoline quinone disodium salt 122628-50-6 C14H4N2Na2O8
	Methyl indole-2-carboxylate Methyl indole-2-carboxylate 1202-04-6 C10H9NO2
DEPMPO DEPMPO 157230-67-6 C9H18NO4P
(S)-2-(2,2-difluoroethyl)piperazine (S)-2-(2,2-difluoroethyl)piperazine
(S)-2-(2,2-difluoroethyl)piperazine dihydrochloride (S)-2-(2,2-difluoroethyl)piperazine dihydrochloride
(R)-2-(2,2,2-trifluoroethyl)piperazine dihydrochloride (R)-2-(2,2,2-trifluoroethyl)piperazine dihydrochloride
2-(6-aminopyridin-3-yl)propan-2-ol 2-(6-aminopyridin-3-yl)propan-2-ol 843643-03-8 C8H12N2O
(1R,2R)-2-amino-6-(4-nitrophenyl)-1-phenylhex-5-yn-1-olhydrochloride (1R,2R)-2-amino-6-(4-nitrophenyl)-1-phenylhex-5-yn-1-olhydrochloride 1628836-08-7 C18H19ClN2O3
(S)-1-(6-(4-fluoro-1H-pyrazol-1-yl)pyridin-3-yl)ethanamine (S)-1-(6-(4-fluoro-1H-pyrazol-1-yl)pyridin-3-yl)ethanamine 1980023-96-8 C10H11FN4
(6bR,10aS)-3-Methyl-2,3,6b,7,8,9,10,10a-octahydro-1H-pyrido[3',4':4,5]pyrrolo[1,2,3-de]quinoxaline (6bR,10aS)-3-Methyl-2,3,6b,7,8,9,10,10a-octahydro-1H-pyrido[3',4':4,5]pyrrolo[1,2,3-de]quinoxaline 313368-85-3 C14H19N3
2-(2-Aminobenzoyl)pyridine 2-(2-Aminobenzoyl)pyridine 42471-56-7 C12H10N2O
(Z)-ethyl (2-cyano-2-(2-(3,5-dichloro-4-((5-isopropyl-6-oxo-1,6-dihydropyridazin-3-yl)oxy)phenyl)hydrazono)acetyl)carbamate(WXG00198) (Z)-ethyl (2-cyano-2-(2-(3,5-dichloro-4-((5-isopropyl-6-oxo-1,6-dihydropyridazin-3-yl)oxy)phenyl)hydrazono)acetyl)carbamate(WXG00198) 920509-33-7 C19H18Cl2N6O5
METHYL 2-FLUORO-4-NITROBENZENECARBOXYLATE METHYL 2-FLUORO-4-NITROBENZENECARBOXYLATE 392-09-6 C8H6FNO4
Ethyl 2-Chloro-5-fluoropyrimidine-4-carboxylate Ethyl 2-Chloro-5-fluoropyrimidine-4-carboxylate 1246632-85-8 C7H6ClFN2O2
(4-FLUOROPHENYLTHIO)ACETONE (4-FLUOROPHENYLTHIO)ACETONE 2968-13-0 C9H9FOS
Methyl oxindole-5-carboxylate Methyl oxindole-5-carboxylate 199328-10-4 C10H9NO3
(3,5-Di-tert-butylphenyl)boronic acid (3,5-Di-tert-butylphenyl)boronic acid 197223-39-5 C14H23BO2
1,3,5-TRIBENZYLHEXAHYDRO-1,3,5-TRIAZINE 1,3,5-TRIBENZYLHEXAHYDRO-1,3,5-TRIAZINE 2547-66-2 C24H27N3
5-BROMO-3-HYDROXY (1H)INDAZOLE 5-BROMO-3-HYDROXY (1H)INDAZOLE 7364-27-4 C7H5BrN2O
(2S,4R)-Methyl 4-hydroxypyrrolidine-2-carboxylate (2S,4R)-Methyl 4-hydroxypyrrolidine-2-carboxylate 1499-56-5 C6H11NO3
4-BROMO-7-METHYLQUINOLINE 4-BROMO-7-METHYLQUINOLINE 1070879-24-1 C10H8BrN
2-Methyl-2-thiazoline-4-carboxylic Acid Sodium Salt 2-Methyl-2-thiazoline-4-carboxylic Acid Sodium Salt 15058-19-2 C5H6NNaO2S
1-(oxan-4-yl)-1H-pyrazol-3-amine 1-(oxan-4-yl)-1H-pyrazol-3-amine 1339391-39-7 C8H13N3O
tert-Butyl 4-(2-ethoxy-2-oxoethyl)piperidine-1-carboxylate tert-Butyl 4-(2-ethoxy-2-oxoethyl)piperidine-1-carboxylate 135716-09-5 C14H25NO4
2-cyclopropyl-5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyrazine 2-cyclopropyl-5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyrazine 2223035-26-3 C13H19BN2O2
Isoxazole Isoxazole 288-14-2 C3H3NO
methyl 8-amino-2,3-dimethylimidazo[1,2-a]pyridine-6-carboxylate methyl 8-amino-2,3-dimethylimidazo[1,2-a]pyridine-6-carboxylate 248919-96-2 C11H13N3O2
1-(CYCLOHEXYLCARBONYL)PIPERAZINE 1-(CYCLOHEXYLCARBONYL)PIPERAZINE 27561-62-2 C11H20N2O
2-phenyl-5H,6H,7H-cyclopenta[d]pyrimidin-4-ol 2-phenyl-5H,6H,7H-cyclopenta[d]pyrimidin-4-ol 87753-08-0 C13H12N2O
2-Methyl-6-(2,2,2-trifluoroethyl)thieno[2,3-d]pyrimidin-4(3H)-one 2-Methyl-6-(2,2,2-trifluoroethyl)thieno[2,3-d]pyrimidin-4(3H)-one 2163770-66-7 C9H7F3N2OS
5-oxoproline, compound with piperazine (1:1) 5-oxoproline, compound with piperazine (1:1) 4889-40-1 C5H7NO3.C4H10N2
3-(5-Chlorobiphenyl)-2-phenylpyridine 3-(5-Chlorobiphenyl)-2-phenylpyridine 2410989-70-5 C23H16ClN
tert-butyl 8-oxo-6-azaspiro[3.5]nonane-6-carboxylate tert-butyl 8-oxo-6-azaspiro[3.5]nonane-6-carboxylate 2090734-62-4 C13H21NO3
octyl (R)-2-(4-chloro-2-methylphenoxy)propionate          octyl (R)-2-(4-chloro-2-methylphenoxy)propionate 66423-13-0 C18H27ClO3
1-N-Boc-5-oxo-1,4-diazepane 1-N-Boc-5-oxo-1,4-diazepane 190900-21-1 C10H18N2O3
(S)-3-(dimethylamino)-1-(3-methoxyphenyl)-2-methylpropan-1-one (S)-3-(dimethylamino)-1-(3-methoxyphenyl)-2-methylpropan-1-one 850222-40-1 C13H19NO2
4-[2-(2-Amino-4,7-dihydro-4-oxo-1H-pyrrolo[2,3-d]pyrimidin-5-yl)ethyl]benzoic acid methyl ester 4-[2-(2-Amino-4,7-dihydro-4-oxo-1H-pyrrolo[2,3-d]pyrimidin-5-yl)ethyl]benzoic acid methyl ester 155405-80-4 C16H16N4O3
1-BENZOTHIOPHEN-3(2H)-ONE 1-BENZOTHIOPHEN-3(2H)-ONE 130-03-0 C8H6OS
5,7-DIBROMO INDOLE 5,7-DIBROMO INDOLE 36132-08-8 C8H5Br2N
6-Isopropylisoquinoline 6-Isopropylisoquinoline 790304-84-6 C12H13N
2-Pyridinemethanamine, 3-bromo-α-[(3,5-difluorophenyl)methyl]-6-[3-methyl-3-(methylsulfonyl)-1-butyn-1-yl]-, (αS)- 2-Pyridinemethanamine, 3-bromo-α-[(3,5-difluorophenyl)methyl]-6-[3-methyl-3-(methylsulfonyl)-1-butyn-1-yl]-, (αS)- 2375019-85-3 C19H19BrF2N2O2S
4(1H)-Pyrimidinone, 2-amino-5-hydroxy-6-methyl- (9CI) 4(1H)-Pyrimidinone, 2-amino-5-hydroxy-6-methyl- (9CI) 14405-13-1 C5H7N3O2
3-(4-Bromo-2,6-dichlorophenyl)piperidine-2,6-dione 3-(4-Bromo-2,6-dichlorophenyl)piperidine-2,6-dione 3036607-19-6 C11H8BrCl2NO2
6-CHLORO-1H-PYRROLO[3,2-B]PYRIDINE 6-CHLORO-1H-PYRROLO[3,2-B]PYRIDINE 1021339-19-4 C7H5ClN2
3,8-Diaza-bicyclo[3.2.1]octane
3,8-Diaza-bicyclo[3.2.1]octane 280-06-8 C6H12N2
4-bromoisoindolin-1-one 4-bromoisoindolin-1-one 337536-15-9 C8H6BrNO
N-(4-(2-aminoacetyl)-5-methoxy-2-phenoxyphenyl)methanesulfonamide hydrochloride N-(4-(2-aminoacetyl)-5-methoxy-2-phenoxyphenyl)methanesulfonamide hydrochloride 149436-41-9 C16H19ClN2O5S
4-bromo-7-chloro-1H-pyrrolo[2,3-c]pyridine 4-bromo-7-chloro-1H-pyrrolo[2,3-c]pyridine 425380-38-7 C7H4BrClN2
(R)-3-Methylmorpholine (R)-3-Methylmorpholine 74572-04-6 C5H11NO
3-Bromophthalide 3-Bromophthalide 6940-49-4 C8H5BrO2
GLYCODEHYDROCHOLIC ACID GLYCODEHYDROCHOLIC ACID 3415-45-0 C26H37NO6
Cyclopropanecarboxamide, 2-[[(2,4-dimethyl-5-pyrimidinyl)oxy]methyl]-2-(3-fluorophenyl)-N-(5-fluoro-2-pyridinyl)-, (1R,2R)- Cyclopropanecarboxamide, 2-[[(2,4-dimethyl-5-pyrimidinyl)oxy]methyl]-2-(3-fluorophenyl)-N-(5-fluoro-2-pyridinyl)-, (1R,2R)- 3070371-41-1 C22H20F2N4O2
2-Thiophenesulfonic acid, 5-chloro-, 3H-1,2,3-triazolo[4,5-b]pyridin-3-yl ester 2-Thiophenesulfonic acid, 5-chloro-, 3H-1,2,3-triazolo[4,5-b]pyridin-3-yl ester 3099785-83-5 C9H5ClN4O3S2
(E)-10-Hexadecenal (E)-10-Hexadecenal 72698-30-7
[1,2,4]Triazolo[1,5-a]pyridine, 7-[2-methyl-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenoxy]- [1,2,4]Triazolo[1,5-a]pyridine, 7-[2-methyl-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenoxy]- 3055865-57-8 C19H22BN3O3
1,4-Bis(4-amino-2-trifluoromethylphenoxy)benzene 1,4-Bis(4-amino-2-trifluoromethylphenoxy)benzene 94525-05-0 C20H14F6N2O2
2-Dimethylamino-pyrimidine-5-boronic acid pinacol ester 2-Dimethylamino-pyrimidine-5-boronic acid pinacol ester 1032759-30-0 C12H20BN3O2
Methyl 10-(2,5-dioxo-2,5-dihydro-1H-pyrrol-1-yl)-9-methoxy-3-oxo-3H-benzo[f]chromene-2-carboxylate Methyl 10-(2,5-dioxo-2,5-dihydro-1H-pyrrol-1-yl)-9-methoxy-3-oxo-3H-benzo[f]chromene-2-carboxylate 137350-66-4 C20H13NO7
(R)-TETRAHYDROFURAN-2-CARBOXYLIC ACID METHYL ESTER (R)-TETRAHYDROFURAN-2-CARBOXYLIC ACID METHYL ESTER 87324-00-3 C6H10O3
(E)-6-Iodo-3-[2-(pyridin-2-yl)ethenyl]-1-(tetrahydro-2H-pyran-2-yl)-1H-indazole (E)-6-Iodo-3-[2-(pyridin-2-yl)ethenyl]-1-(tetrahydro-2H-pyran-2-yl)-1H-indazole 886230-77-9 C19H18IN3O
4,6-Dimethoxypyrimidin-5-methyl amine 4,6-Dimethoxypyrimidin-5-methyl amine 1118786-90-5 C7H11N3O2
5-amino-6-methoxypyrimidine-4-carbonitrile 5-amino-6-methoxypyrimidine-4-carbonitrile 2763258-94-0
3-benzyl-6-bromo-2-chloroquinoline 3-benzyl-6-bromo-2-chloroquinoline 654655-68-2 C16H11BrClN
(3R,4R)-3-(Boc-amino)-1-Cbz-4-(hydroxymethyl)pyrrolidine (3R,4R)-3-(Boc-amino)-1-Cbz-4-(hydroxymethyl)pyrrolidine 370881-64-4 C18H26N2O5
2-Methyl-5-nitroimidazole 2-Methyl-5-nitroimidazole 88054-22-2 C4H5N3O2
2-Oxa-spiro[3.3]heptan-6-one 2-Oxa-spiro[3.3]heptan-6-one 1339892-66-8 C6H8O2
4,6-Difluoro-2-Methylsulfanyl-pyriMidine 4,6-Difluoro-2-Methylsulfanyl-pyriMidine 122815-08-1 C5H4F2N2S
Islatravir Islatravir 865363-93-5 C12H12FN5O3
4-(((tert-butyldiMethylsilyl)oxy)Methyl)aniline 4-(((tert-butyldiMethylsilyl)oxy)Methyl)aniline 131230-76-7 C13H23NOSi
1-(Pyridin-4-yl)cyclopropanecarboxylic acid 1-(Pyridin-4-yl)cyclopropanecarboxylic acid 920297-29-6 C9H9NO2
Methyl 5-broMo-6-oxo-1,6-dihydropyridine-2-carboxylate Methyl 5-broMo-6-oxo-1,6-dihydropyridine-2-carboxylate 178876-86-3 C7H6BrNO3
8-QuinolinaMine, 5,6,7,8-tetrahydro-, hydrochloride (1:2), (8S)- 8-QuinolinaMine, 5,6,7,8-tetrahydro-, hydrochloride (1:2), (8S)- 865303-57-7 C9H14Cl2N2
(R,E)-5-([1,1'-biphenyl]-4-yl)-4-((tert-butoxycarbonyl)aMino)-2-Methylpent-2-enoic acid (R,E)-5-([1,1'-biphenyl]-4-yl)-4-((tert-butoxycarbonyl)aMino)-2-Methylpent-2-enoic acid 1012341-48-8 C23H27NO4
4,6-dichloro-5-(4-chlorophenyl)-pyriMidine 4,6-dichloro-5-(4-chlorophenyl)-pyriMidine 3974-18-3 C10H5Cl3N2
1,5-PENTANEDIOL DIMETHACRYLATE 1,5-PENTANEDIOL DIMETHACRYLATE 13675-34-8 C13H20O4
(R,R)-2,2'-(2,6-PYRIDINEDIYL)BIS(4-ISOPROPYL-2-OXAZOLINE) (R,R)-2,2'-(2,6-PYRIDINEDIYL)BIS(4-ISOPROPYL-2-OXAZOLINE) 131864-67-0 C17H23N3O2
Propargyl-PEG4-bromide Propargyl-PEG4-bromide 1308299-09-3 C11H19BrO4
2,4-dichloropyrido[3',2':4,5]furo[3,2-d]pyrimidine 2,4-dichloropyrido[3',2':4,5]furo[3,2-d]pyrimidine 1268241-74-2 C9H3Cl2N3O
2-bromo-5-phenylpyrimidine 2-bromo-5-phenylpyrimidine 155079-14-4 C10H7BrN2
1-CYCLOPROPYLPIPERAZINE DIHYDROCHLORIDE 1-CYCLOPROPYLPIPERAZINE DIHYDROCHLORIDE 139256-79-4 C7H16Cl2N2
(2,2-Difluoro-benzo[1,3]dioxol-4-yl)acetonitrile (2,2-Difluoro-benzo[1,3]dioxol-4-yl)acetonitrile 157437-24-6 C9H5F2NO2
4,6-Dichloro-2-(4-chloro-3-fluorophenyl)pyrimidine 4,6-Dichloro-2-(4-chloro-3-fluorophenyl)pyrimidine 1190735-18-2 C10H4Cl3FN2
1-(4-TERT-BUTYLBENZYL)PIPERAZINE 1-(4-TERT-BUTYLBENZYL)PIPERAZINE 956-61-6 C15H24N2
5,6,7,8-TETRAHYDRO-[1,2,4]TRIAZOLO[4,3-A]PYRAZINE HYDROCHLORIDE 5,6,7,8-TETRAHYDRO-[1,2,4]TRIAZOLO[4,3-A]PYRAZINE HYDROCHLORIDE 345311-09-3 C5H8N4
(S)-2-(2,2,2-TRIFLUORO-ETHYL)-PIPERAZINE (S)-2-(2,2,2-TRIFLUORO-ETHYL)-PIPERAZINE 1240584-16-0 C6H11F3N2
6,6-Difluoro-[1,4]Diazepane-1-Carboxylic Acid Tert-Butyl Ester(WX630010) 6,6-Difluoro-[1,4]Diazepane-1-Carboxylic Acid Tert-Butyl Ester(WX630010) 1166820-07-0 C10H18F2N2O2
1,1,1-Trifluoro-2,3-epoxypropane 1,1,1-Trifluoro-2,3-epoxypropane 359-41-1 C3H3F3O
2-bromo-7-propyl-[1,3,4]thiadiazolo[3,2-a]pyrimidin-5-one 2-bromo-7-propyl-[1,3,4]thiadiazolo[3,2-a]pyrimidin-5-one 1210532-02-7 C8H8BrN3OS
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