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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-Bromo-1-chloroisoquinoline 4-Bromo-1-chloroisoquinoline 66728-98-1 C9H5BrClN
N'-Hydroxy-2-(pyrrolidin-1-yl)benzimidamide N'-Hydroxy-2-(pyrrolidin-1-yl)benzimidamide C11H15N3O
6-Bromo-4-hydroxy-pyrazolo[1,5-a]pyridine-3-carbonitrile 6-Bromo-4-hydroxy-pyrazolo[1,5-a]pyridine-3-carbonitrile 2068065-16-5 C8H4BrN3O
2,4,8,10-Tetraoxa-3,9-dithiaspiro[5.5]undecane, 3,3,9,9-tetraoxide 2,4,8,10-Tetraoxa-3,9-dithiaspiro[5.5]undecane, 3,3,9,9-tetraoxide 201419-80-9 C5H8O8S2
(SP-4-1)-[1,3-Bis[2,6-bis(1-propylbutyl)phenyl]-4,5-dichloro-1,3-dihydro-2H-imidazol-2-ylidene]dichloro(3-chloropyridine-κN)-Palladium (SP-4-1)-[1,3-Bis[2,6-bis(1-propylbutyl)phenyl]-4,5-dichloro-1,3-dihydro-2H-imidazol-2-ylidene]dichloro(3-chloropyridine-κN)-Palladium 1814936-54-3 C48H70Cl5N3Pd
(R)-2-((trifluoromethoxy)methyl)piperazine (R)-2-((trifluoromethoxy)methyl)piperazine
N6-[(5-Bromothien-2-yl)methyl]adenosine N6-[(5-Bromothien-2-yl)methyl]adenosine 1706525-09-8 C15H16BrN5O4S
3-Ethynyl-1-(1-methylethyl)-1H-pyrazolo[3,4-d]pyrimidin-4-amine 3-Ethynyl-1-(1-methylethyl)-1H-pyrazolo[3,4-d]pyrimidin-4-amine 1189793-01-8 C10H11N5
4-Acetoxyindole 4-Acetoxyindole 5585-96-6 C10H9NO2
2-(3,5-Dichlorophenyl)Pyrrolidine 2-(3,5-Dichlorophenyl)Pyrrolidine 887344-13-0 C10H11Cl2N
(S)-1-BOC-2-METHYL-[1,4]DIAZEPANE (S)-1-BOC-2-METHYL-[1,4]DIAZEPANE 194032-32-1 C11H22N2O2
3-Iodo-1-(1-methyl-piperidin-4-ylmethyl)-1H-pyrazolo[3,4-d]pyrimidin-4-ylamine 3-Iodo-1-(1-methyl-piperidin-4-ylmethyl)-1H-pyrazolo[3,4-d]pyrimidin-4-ylamine 1411763-96-6 C12H17IN6
2,5-Piperazinedione, 1-acetyl-3-(phenylmethylene)-, (3Z)- 2,5-Piperazinedione, 1-acetyl-3-(phenylmethylene)-, (3Z)- 30166-30-4 C13H12N2O3
3,5-Dibromo-1H-pyrazole 3,5-Dibromo-1H-pyrazole 67460-86-0 C3H2Br2N2
2-cyanoethyl 4-(4-cyano-2-methoxyphenyl)-2,8-dimethyl-5-oxo-1,4,5,6-tetrahydro-1,6-naphthyridine-3-carboxylate 2-cyanoethyl 4-(4-cyano-2-methoxyphenyl)-2,8-dimethyl-5-oxo-1,4,5,6-tetrahydro-1,6-naphthyridine-3-carboxylate 1050477-43-4 C22H20N4O4
MK-4618 Pyrimidinone Acid Sodium Salt MK-4618 Pyrimidinone Acid Sodium Salt 1421271-01-3 C8H9N2NaO3
4,6-Dibromo-pyrazolo[1,5-a]pyridine-3-carbonitrile 4,6-Dibromo-pyrazolo[1,5-a]pyridine-3-carbonitrile 2068065-63-2 C8H3Br2N3
4-Pyrimidinamine, 2-chloro-N-[2-[(1-methylethyl)sulfonyl]phenyl]- 4-Pyrimidinamine, 2-chloro-N-[2-[(1-methylethyl)sulfonyl]phenyl]- 1197956-18-5 C13H14ClN3O2S
2-(2-METHOXYPHENYL)-4,4-DIMETHYL-2-OXAZOLINE 2-(2-METHOXYPHENYL)-4,4-DIMETHYL-2-OXAZOLINE 57598-33-1 C12H15NO2
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
(R)-1-Boc-3-methylpiperazine (R)-1-Boc-3-methylpiperazine 163765-44-4 C10H20N2O2
Latanoprost acid Latanoprost acid 41639-83-2 C23H34O5
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
1H-PYRROLO[2,3-C]PYRIDINE-2-CARBALDEHYDE 1H-PYRROLO[2,3-C]PYRIDINE-2-CARBALDEHYDE 867034-96-6 C8H6N2O
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
3-Ethynylimidazo[1,2-b]pyridazine 3-Ethynylimidazo[1,2-b]pyridazine 943320-61-4 C8H5N3
4,6-Dihydrothieno[3,4-b]thiophene-2-carboxylic acid 4,6-Dihydrothieno[3,4-b]thiophene-2-carboxylic acid 7712-05-2 C7H6O2S2
17-Iodoandrosta-5,16-dien-3beta-ol 17-Iodoandrosta-5,16-dien-3beta-ol 32138-69-5 C19H27IO
3-BroMo-5fluoro-4-Methylpyridine 3-BroMo-5fluoro-4-Methylpyridine 1211517-76-8 C6H5BrFN
1-(2-Fluoro-6-(trifluoromethyl)benzyl)-6-methylpyrimidine-2,4(1H,3H)-dione 1-(2-Fluoro-6-(trifluoromethyl)benzyl)-6-methylpyrimidine-2,4(1H,3H)-dione 830346-47-9 C13H10F4N2O2
2-PyriMidinaMine, 4-(4-fluoro-1-naphthalenyl)-6-(1-Methylethyl)-, Monohydrochloride 2-PyriMidinaMine, 4-(4-fluoro-1-naphthalenyl)-6-(1-Methylethyl)-, Monohydrochloride 199864-86-3 C17H17ClFN3
(5R)- 5-Methyl-2-Pyrrolidinone (5R)- 5-Methyl-2-Pyrrolidinone 21395-93-7 C5H9NO
2-chloro-4-iodopyrimidine 2-chloro-4-iodopyrimidine 395082-55-0 C4H2ClIN2
5-(4-Bromophenyl)-4,6-dichloropyrimidine 5-(4-Bromophenyl)-4,6-dichloropyrimidine 146533-41-7 C10H5BrCl2N2
6-BroMo-5-Methyl-2-pyridinaMine 6-BroMo-5-Methyl-2-pyridinaMine 89466-17-1 C6H7BrN2
1-(4-(3-Methoxy-4-nitrophenyl)piperazin-1-yl)ethanone 1-(4-(3-Methoxy-4-nitrophenyl)piperazin-1-yl)ethanone 1116229-11-8 C13H17N3O4
2-Methyl-N-(4-sulfaMoyl-phenyl)-acrylaMide 2-Methyl-N-(4-sulfaMoyl-phenyl)-acrylaMide 56992-87-1 C10H12N2O3S
3-(Benzyloxy)-4-oxo-4h-pyran-2-carboxylic acid 3-(Benzyloxy)-4-oxo-4h-pyran-2-carboxylic acid 119736-16-2 C13H10O5
SELEXIPAG interMediate SELEXIPAG interMediate 475086-75-0 C23H27N3O
2-PhenylpyriMidine-4-carboxylic acid 2-PhenylpyriMidine-4-carboxylic acid 16879-53-1 C11H8N2O2
Ethyl 2-chloropyrazolo[1,5-a]pyriMidine-3-carboxylate Ethyl 2-chloropyrazolo[1,5-a]pyriMidine-3-carboxylate 1394003-65-6 C9H8ClN3O2
Pyrazolam Pyrazolam 39243-02-2 C16H12BrN5
4-(1-Fluoro-1-methyl-ethyl)-pyrimidine-5-carbaldehyde 4-(1-Fluoro-1-methyl-ethyl)-pyrimidine-5-carbaldehyde 1427195-14-9 C8H9FN2O
4-(3-(allyloxymethyl)phenyl)-2-chloropyrimidine 4-(3-(allyloxymethyl)phenyl)-2-chloropyrimidine 937273-29-5 C14H13ClN2O
tert-Butyl 2,8-diazaspiro[4.5]decane-2-carboxylate tert-Butyl 2,8-diazaspiro[4.5]decane-2-carboxylate 336191-17-4 C13H24N2O2
2-(tert-butoxycarbonyl)-5,7-dichloro-1,2,3,4-tetrahydroisoquinoline-6-carboxylic acid 2-(tert-butoxycarbonyl)-5,7-dichloro-1,2,3,4-tetrahydroisoquinoline-6-carboxylic acid 851784-82-2 C15H17Cl2NO4
Pyridine, 4-[5-(4-pyridinyl)-1H-1,2,4-triazol-3-yl]-, 1-oxide Pyridine, 4-[5-(4-pyridinyl)-1H-1,2,4-triazol-3-yl]-, 1-oxide 36770-53-3 C12H9N5O
trans-2,5-Bis(methoxymethyl)pyrrolidine trans-2,5-Bis(methoxymethyl)pyrrolidine 144993-81-7 C8H17NO2
(6R,7R)-7-AMINO-8-OXO-3-((2S)-TETRAHYDROFURAN-2-YL)-5-THIA-1-AZABICYCLO[4.2.0]OCT-2-ENE-2-CARBOXYLIC ACID 4-NITROBENZYL ESTER HCL (6R,7R)-7-AMINO-8-OXO-3-((2S)-TETRAHYDROFURAN-2-YL)-5-THIA-1-AZABICYCLO[4.2.0]OCT-2-ENE-2-CARBOXYLIC ACID 4-NITROBENZYL ESTER HCL 655233-39-9 C18H20ClN3O6S
6-Fluoro-1-methyl-1H-indole-2-carboxylic acid 6-Fluoro-1-methyl-1H-indole-2-carboxylic acid 893731-12-9 C10H8FNO2
3-Bromo-11,11-dimethyl-11H-benzo[b]fluorene 3-Bromo-11,11-dimethyl-11H-benzo[b]fluorene 1674334-59-8 C19H15Br
(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
1-CYCLOPROPYLPIPERAZINE DIHYDROCHLORIDE 1-CYCLOPROPYLPIPERAZINE DIHYDROCHLORIDE 139256-79-4 C7H16Cl2N2
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
(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
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
Pyrroloquinoline quinone disodium salt Pyrroloquinoline quinone disodium salt 122628-50-6 C14H4N2Na2O8
	Methyl indole-2-carboxylate Methyl indole-2-carboxylate 1202-04-6 C10H9NO2
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
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
3-(5-Chlorobiphenyl)-2-phenylpyridine 3-(5-Chlorobiphenyl)-2-phenylpyridine 2410989-70-5 C23H16ClN
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
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
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
4-Chloro-2-mercaptobenzothiazole 4-Chloro-2-mercaptobenzothiazole 1849-65-6 C7H4ClNS2
2-CHLORO-4-PHENYLQUINAZOLINE 2-CHLORO-4-PHENYLQUINAZOLINE 29874-83-7 C14H9ClN2
5-BROMO-2-CHLORO-1H-BENZIMIDAZOLE 5-BROMO-2-CHLORO-1H-BENZIMIDAZOLE 683240-76-8 C7H4BrClN2
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
3-IODO-1-METHYL-1H-INDAZOLE 3-IODO-1-METHYL-1H-INDAZOLE 52088-10-5 C8H7IN2
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
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