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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
7-CHLORO-1H-PYRROLO[2,3-C]PYRIDINE 7-CHLORO-1H-PYRROLO[2,3-C]PYRIDINE 357263-41-3 C7H5ClN2
7-Methyl-1,8-naphthyridin-2-amine 7-Methyl-1,8-naphthyridin-2-amine 1568-93-0 C9H9N3
6-HYDROXYMETHYLINDOLE 6-HYDROXYMETHYLINDOLE 1075-26-9 C9H9NO
3-METHYL-1,3-THIAZOLANE-2,4-DIONE 3-METHYL-1,3-THIAZOLANE-2,4-DIONE 16312-21-3 C4H5NO2S
(R)-1-Boc-3-methylpiperazine (R)-1-Boc-3-methylpiperazine 163765-44-4 C10H20N2O2
2-bromothiazol-4-amine 2-bromothiazol-4-amine 41731-33-3 C3H3BrN2S
 cis-Octahydro-1H-isoindole hydrochloride cis-Octahydro-1H-isoindole hydrochloride 161829-92-1 C8H16ClN
3-Ethynylimidazo[1,2-b]pyridazine 3-Ethynylimidazo[1,2-b]pyridazine 943320-61-4 C8H5N3
4-Chloro-6-methoxy-7-[(1-methylpiperidin-4-yl)methoxy]quinazoline 4-Chloro-6-methoxy-7-[(1-methylpiperidin-4-yl)methoxy]quinazoline 264208-72-2 C16H20ClN3O2
3-IODO-1-METHYL-1H-INDAZOLE 3-IODO-1-METHYL-1H-INDAZOLE 52088-10-5 C8H7IN2
5-BROMO-2-CHLORO-1H-BENZIMIDAZOLE 5-BROMO-2-CHLORO-1H-BENZIMIDAZOLE 683240-76-8 C7H4BrClN2
2-CHLORO-4-PHENYLQUINAZOLINE 2-CHLORO-4-PHENYLQUINAZOLINE 29874-83-7 C14H9ClN2
3-(4,6-dimethyl-2-oxopyrimidin-1(2H)-yl)propanoic acid 3-(4,6-dimethyl-2-oxopyrimidin-1(2H)-yl)propanoic acid 764642-23-1 C9H12N2O3
2-(3-Chloro-phenyl)-pyrrolidine 2-(3-Chloro-phenyl)-pyrrolidine 298690-74-1 C10H12ClN
2-(2-METHOXYPHENYL)-4,4-DIMETHYL-2-OXAZOLINE 2-(2-METHOXYPHENYL)-4,4-DIMETHYL-2-OXAZOLINE 57598-33-1 C12H15NO2
4-Chloro-2-mercaptobenzothiazole 4-Chloro-2-mercaptobenzothiazole 1849-65-6 C7H4ClNS2
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
(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
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
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
(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
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
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
2-Methyl-2-thiazoline-4-carboxylic Acid Sodium Salt 2-Methyl-2-thiazoline-4-carboxylic Acid Sodium Salt 15058-19-2 C5H6NNaO2S
tert-Butyl 4-(2-ethoxy-2-oxoethyl)piperidine-1-carboxylate tert-Butyl 4-(2-ethoxy-2-oxoethyl)piperidine-1-carboxylate 135716-09-5 C14H25NO4
Isoxazole Isoxazole 288-14-2 C3H3NO
(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-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
	Methyl indole-2-carboxylate Methyl indole-2-carboxylate 1202-04-6 C10H9NO2
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-METHOXY-2-METHYL-1H-INDOLE 6-METHOXY-2-METHYL-1H-INDOLE 1968-13-4 C10H11NO
5-oxoproline, compound with piperazine (1:1) 5-oxoproline, compound with piperazine (1:1) 4889-40-1 C5H7NO3.C4H10N2
(S)-3-(dimethylamino)-1-(3-methoxyphenyl)-2-methylpropan-1-one (S)-3-(dimethylamino)-1-(3-methoxyphenyl)-2-methylpropan-1-one 850222-40-1 C13H19NO2
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
Isoquinoline, 6-(1-methylethyl)- (9CI) Isoquinoline, 6-(1-methylethyl)- (9CI) 790304-84-6 C12H13N
4(1H)-Pyrimidinone, 2-amino-5-hydroxy-6-methyl- (9CI) 4(1H)-Pyrimidinone, 2-amino-5-hydroxy-6-methyl- (9CI) 14405-13-1 C5H7N3O2
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
THIAZOLE ORANGE THIAZOLE ORANGE 107091-89-4 C26H24N2O3S2
(4-Cyclopropyl-6-methoxypyrimidin-5-yl)boronic acid (4-Cyclopropyl-6-methoxypyrimidin-5-yl)boronic acid 1798304-51-4 C8H11BN2O3
2-Bromo-6-methoxybenzothiazole 2-Bromo-6-methoxybenzothiazole 2941-58-4 C8H6BrNOS
3-CHLOROBENZHYDRAZIDE 3-CHLOROBENZHYDRAZIDE 1673-47-8 C7H7ClN2O
3'-CHLORO-4'-FLUOROACETANILIDE 3'-CHLORO-4'-FLUOROACETANILIDE 877-90-7 C8H7ClFNO
4-(4-(5-fluoropyrimidin-2-yl)piperazin-1-yl)aniline 4-(4-(5-fluoropyrimidin-2-yl)piperazin-1-yl)aniline 1921374-52-8 C14H16FN5
2-methyl-8-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)benzofuro[2,3-b]pyridine 2-methyl-8-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)benzofuro[2,3-b]pyridine 1609374-04-0 C18H20BNO3
1-BOC-4-(4-BROMO-PHENYLAMINO)-PIPERIDINE 1-BOC-4-(4-BROMO-PHENYLAMINO)-PIPERIDINE 443998-65-0 C16H23BrN2O2
4-(aminomethyl)-N,N,6-trimethylpyrimidin-2-amine 4-(aminomethyl)-N,N,6-trimethylpyrimidin-2-amine 1177480-26-0 C8H14N4
4 5-DIAMINO-6-HYDROXY-2-MERCAPTOPYRIMID& 4 5-DIAMINO-6-HYDROXY-2-MERCAPTOPYRIMID& 304851-89-6 C4H6N4OS.H2O.H2O4S
6-Methoxy-1,2,3,4-tetrahydroisoquinoline hydrochloride 6-Methoxy-1,2,3,4-tetrahydroisoquinoline hydrochloride 57196-62-0 C10H14ClNO
1-but-3-enyl-4-(2,3-chloro-phenyl)-piperazine 1-but-3-enyl-4-(2,3-chloro-phenyl)-piperazine
(R)-2-(2-fluoroethyl)piperazine (R)-2-(2-fluoroethyl)piperazine
TERT-BUTYL 3-(4,4,5,5-TETRAMETHYL-1,3,2-DIOXABOROLAN-2-YL)-1H-PYRROLO[3,2-C]PYRIDINE-1-CARBOXYLATE TERT-BUTYL 3-(4,4,5,5-TETRAMETHYL-1,3,2-DIOXABOROLAN-2-YL)-1H-PYRROLO[3,2-C]PYRIDINE-1-CARBOXYLATE 877060-60-1 C18H25BN2O4
2-Bromo-5-nitrothiazole 2-Bromo-5-nitrothiazole 3034-48-8 C3HBrN2O2S
4-Bromopyrazolo[1,5-a]pyridine-3-carbonitrile 4-Bromopyrazolo[1,5-a]pyridine-3-carbonitrile 2092153-80-3 C8H4BrN3
4,6-DICHLORO-1H-PYRROLO-[3,2-C]-PYRIDINE 4,6-DICHLORO-1H-PYRROLO-[3,2-C]-PYRIDINE 67139-79-1 C7H4Cl2N2
Acefylline Piperazine Acefylline Piperazine 18428-63-2 C100H150N46O32
(R)-2-(2-Chlorophenyl)pyrrolidine (R)-2-(2-Chlorophenyl)pyrrolidine 823188-58-5 C10H12ClN
zinc pivalate zinc pivalate 15827-10-8 C10H18O4Zn
N-methyl-N-((3R,4R)-4-methylpiperidin-3-yl)-7H-pyrrolo[2,3-d]pyrimidin-4-amine N-methyl-N-((3R,4R)-4-methylpiperidin-3-yl)-7H-pyrrolo[2,3-d]pyrimidin-4-amine 477600-74-1 C13H19N5
2-Piperidinecarboxylic acid, 5-[(phenylmethoxy)amino]-, ethyl ester, ethanedioate (1:1), (2R,5S)- 2-Piperidinecarboxylic acid, 5-[(phenylmethoxy)amino]-, ethyl ester, ethanedioate (1:1), (2R,5S)- 2413365-40-7 C17H24N2O7
2(1H)-Pyrimidinone, hydrazone (9CI) 2(1H)-Pyrimidinone, hydrazone (9CI) 7504-94-1 C4H6N4
tert-butyl 4-[2-(2,6-dioxopiperidin-3-yl)-1,3-dioxo-2,3-dihydro-1H-isoindol-5-yl]piperazine-1-c arboxylate tert-butyl 4-[2-(2,6-dioxopiperidin-3-yl)-1,3-dioxo-2,3-dihydro-1H-isoindol-5-yl]piperazine-1-c arboxylate
6-ETHOXYCARBONYLINDOLE-2-CARBOXYLIC ACID ETHYL ESTER 6-ETHOXYCARBONYLINDOLE-2-CARBOXYLIC ACID ETHYL ESTER 107516-75-6 C14H15NO4
1,2,5-Thiadiazoles 1,2,5-Thiadiazoles 288-39-1 C2H2N2S
3,6-dimethyl-1h-pyrimidine-2,4-dione 3,6-dimethyl-1h-pyrimidine-2,4-dione 19674-60-3 C6H8N2O2
7-Aminoisoquinoline 7-Aminoisoquinoline 23707-37-1 C9H8N2
3-Bromopyridine-2,6-dicarboxylic acid 3-Bromopyridine-2,6-dicarboxylic acid 316808-10-3 C7H4BrNO4
6-CHLORO-1H-PYRROLO[3,2-B]PYRIDINE 6-CHLORO-1H-PYRROLO[3,2-B]PYRIDINE 1021339-19-4 C7H5ClN2
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
3-Bromophthalide 3-Bromophthalide 6940-49-4 C8H5BrO2
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
4,6-Difluoro-2-Methylsulfanyl-pyriMidine 4,6-Difluoro-2-Methylsulfanyl-pyriMidine 122815-08-1 C5H4F2N2S
Islatravir Islatravir 865363-93-5 C12H12FN5O3
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
(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
(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
1-CYCLOPROPYLPIPERAZINE DIHYDROCHLORIDE 1-CYCLOPROPYLPIPERAZINE DIHYDROCHLORIDE 139256-79-4 C7H16Cl2N2
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