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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
3-Bromopyridine-2,6-dicarboxylic acid 3-Bromopyridine-2,6-dicarboxylic acid 316808-10-3 C7H4BrNO4
7-Aminoisoquinoline 7-Aminoisoquinoline 23707-37-1 C9H8N2
2H-Pyrido[4,3-b]indole-2-carboxylic acid, 6-bromo-1,3,4,4a,5,9b-hexahydro-, 1,1-dimethylethyl ester, (4aS,9bR)- 2H-Pyrido[4,3-b]indole-2-carboxylic acid, 6-bromo-1,3,4,4a,5,9b-hexahydro-, 1,1-dimethylethyl ester, (4aS,9bR)- 2566614-60-4 C16H21BrN2O2
5-BROMO-IMIDAZO[1,2-A]PYRIDINE 5-BROMO-IMIDAZO[1,2-A]PYRIDINE 69214-09-1 C7H5BrN2
1,3-Dimethyl-1H-pyrazole-4-sulfonamide 1,3-Dimethyl-1H-pyrazole-4-sulfonamide 88398-53-2 C5H9N3O2S
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
Trilaciclib N-3 Trilaciclib N-3 2762067-73-0 C19H25ClN4O4
6-ETHOXYCARBONYLINDOLE-2-CARBOXYLIC ACID ETHYL ESTER 6-ETHOXYCARBONYLINDOLE-2-CARBOXYLIC ACID ETHYL ESTER 107516-75-6 C14H15NO4
3,6-dimethyl-1h-pyrimidine-2,4-dione 3,6-dimethyl-1h-pyrimidine-2,4-dione 19674-60-3 C6H8N2O2
1,2,5-Thiadiazoles 1,2,5-Thiadiazoles 288-39-1 C2H2N2S
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
2,4,8,10-tetraoxa-3,9-dithiaspiro[5.5]undecane 3,9-dioxide 2,4,8,10-tetraoxa-3,9-dithiaspiro[5.5]undecane 3,9-dioxide 3670-93-7 C5H8O6S2
zinc pivalate zinc pivalate 15827-10-8 C10H18O4Zn
2-[(2-ethoxyphenoxy)methyl]morpholine hydrochloride 2-[(2-ethoxyphenoxy)methyl]morpholine hydrochloride 35604-67-2 C13H20ClNO3
4-methyl-1-phenylpent-3-en-1-ol 4-methyl-1-phenylpent-3-en-1-ol 27644-03-7 C12H16O
5-PYRIMIDINECARBONITRILE,1,6-DIHYDRO-4-(3-METHOXYPHENYL)-2-(METHYLTHIO)-6-OXO-(WXG01917) 5-PYRIMIDINECARBONITRILE,1,6-DIHYDRO-4-(3-METHOXYPHENYL)-2-(METHYLTHIO)-6-OXO-(WXG01917) 128640-73-3 C13H11N3O2S
3-Isochromanone 3-Isochromanone 4385-35-7 C9H8O2
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
1,4-Dichlorophthalazine 1,4-Dichlorophthalazine 4752-10-7 C8H4Cl2N2
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
(S)-4-((1,2,3,4-tetrahydroisoquinolin-3-yl)methyl)morpholine (S)-4-((1,2,3,4-tetrahydroisoquinolin-3-yl)methyl)morpholine 1415095-29-2 C14H20N2O
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
1 4-DIOXA-8-AZASPIRO(4.5)DECANE 1 4-DIOXA-8-AZASPIRO(4.5)DECANE 42899-11-6 C7H13N1O2
9-(2-Ethylhexyl)carbazole-3,6-dicarboxaldehyde 9-(2-Ethylhexyl)carbazole-3,6-dicarboxaldehyde 169051-20-1 C22H25NO2
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
α-D-Glucopyranoside, methyl 4-O-[2-O-acetyl-6-methyl-3-O-(phenylmethyl)-α-L-idopyranuronosyl]-2-deoxy-2-[[(phenylmethoxy)carbonyl]amino]-3-O-(phenylmethyl)-, 6-benzoate α-D-Glucopyranoside, methyl 4-O-[2-O-acetyl-6-methyl-3-O-(phenylmethyl)-α-L-idopyranuronosyl]-2-deoxy-2-[[(phenylmethoxy)carbonyl]amino]-3-O-(phenylmethyl)-, 6-benzoate 1030834-08-2 C45H49NO15
Corey 21 Corey 21 182201-62-3 C37H42N4O11S
1-(4-Methoxyphenyl)piperazine 1-(4-Methoxyphenyl)piperazine 38212-30-5 C11H16N2O
2-Imidazolidone hemihydrate 2-Imidazolidone hemihydrate 121325-67-5 C3H8N2O2
2-N-UNDECYLIMIDAZOLE 2-N-UNDECYLIMIDAZOLE 16731-68-3 C14H26N2
Iminodibenzylcarbonyl chloride Iminodibenzylcarbonyl chloride 33948-19-5 C15H12ClNO
Ethyl 2-bromothiazole-5-carboxylate Ethyl 2-bromothiazole-5-carboxylate 41731-83-3 C6H6BrNO2S
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
(R)-1-N-Boc-2-methylpiperazine (R)-1-N-Boc-2-methylpiperazine 170033-47-3 C10H20N2O2
1-(4-Fluorophenyl)piperazine 1-(4-Fluorophenyl)piperazine 2252-63-3 C10H13FN2
2-Bromo-5-nitrothiazole 2-Bromo-5-nitrothiazole 3034-48-8 C3HBrN2O2S
[(9-oxo-9H-thioxanthen-2-yl)oxy]acetic acid [(9-oxo-9H-thioxanthen-2-yl)oxy]acetic acid 84434-05-9 C15H10O4S
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
D-erythro-Pentonic acid, 2-deoxy-4-C-ethynyl-, γ-lactone, 3,5-bis(4-methylbenzoate) D-erythro-Pentonic acid, 2-deoxy-4-C-ethynyl-, γ-lactone, 3,5-bis(4-methylbenzoate) 2072080-27-2 C23H20O6
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
D-Glucitol, 1,4:3,6-dianhydro-, bis[4-[[4-[[6-[(1-oxo-2-propenyl)oxy]hexyl]oxy]benzoyl]oxy]benzoate] (9CI) D-Glucitol, 1,4:3,6-dianhydro-, bis[4-[[4-[[6-[(1-oxo-2-propenyl)oxy]hexyl]oxy]benzoyl]oxy]benzoate] (9CI) 642471-49-6 C52H54O16
5-(Ethylthio)-1H-tetrazole 5-(Ethylthio)-1H-tetrazole 89797-68-2 C3H6N4S
Isoquinoline, 3,4-dihydro-6,7-dimethoxy-1-[(3,4,5-trimethoxyphenyl)methyl]-, hydrochloride (1:1) Isoquinoline, 3,4-dihydro-6,7-dimethoxy-1-[(3,4,5-trimethoxyphenyl)methyl]-, hydrochloride (1:1) 108704-76-3 C21H26ClNO5
3,3'-Dithiobis(sulfosuccinimidylpropionate) 3,3'-Dithiobis(sulfosuccinimidylpropionate) 81069-02-5 C14H16N2O14S4
2(1H)-Pyrimidinone, hydrazone (9CI) 2(1H)-Pyrimidinone, hydrazone (9CI) 7504-94-1 C4H6N4
3-(2-FURYL)PROPANOIC ACID 3-(2-FURYL)PROPANOIC ACID 935-13-7 C7H8O3
DSPE-PEG-PBA DSPE-PEG-PBA
TERT-BUTYL 2,6-DIAZASPIRO[4.5]DECANE-6-CARBOXYLATE TERT-BUTYL 2,6-DIAZASPIRO[4.5]DECANE-6-CARBOXYLATE 960294-16-0 C13H24N2O2
4,5-DICHLORO-QUINOLINE 4,5-DICHLORO-QUINOLINE 21617-18-5 C9H5Cl2N
Ethyl 5-chloropyrazolo[1,5-a]pyrimidine-3-carboxylate Ethyl 5-chloropyrazolo[1,5-a]pyrimidine-3-carboxylate 1224944-77-7 C9H8ClN3O2
2-Amino-5-bromo-3-(hydroxymethyl)pyridine 2-Amino-5-bromo-3-(hydroxymethyl)pyridine 335031-01-1 C6H7BrN2O
6-Bromo-1H-pyrazolo[4,3-b]pyridine 6-Bromo-1H-pyrazolo[4,3-b]pyridine 1150617-54-1 C6H4BrN3
tert-butyl 3-iodo-6,7-dihydro-1H-pyrazolo[4,3-c]pyridine-5(4H)-carboxylate tert-butyl 3-iodo-6,7-dihydro-1H-pyrazolo[4,3-c]pyridine-5(4H)-carboxylate 661487-17-8 C11H16IN3O2
(1R,2S)-2-(3,4-difluorophenyl)cyclopropanamine hydrochloride (1R,2S)-2-(3,4-difluorophenyl)cyclopropanamine hydrochloride 1156491-10-9 C9H10ClF2N
ethyl 1-acetylcyclopropanecarboxylate ethyl 1-acetylcyclopropanecarboxylate 32933-03-2 C8H12O3
4-Bromo-3-chloro-7-methoxyquinoline 4-Bromo-3-chloro-7-methoxyquinoline 1208452-88-3 C10H7BrClNO
1-(tetrahydro-2H-pyran-4-yl)-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrazole 1-(tetrahydro-2H-pyran-4-yl)-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrazole 1040377-03-4 C14H23BN2O3
(R)-Tetrahydrofuran-3-amine hydrochloride (R)-Tetrahydrofuran-3-amine hydrochloride 1072015-52-1 C4H10ClNO
2-Chloropurine 2-Chloropurine 1681-15-8 C5H3ClN4
6-broMo-4-hydroxyquinolin-2(1H)-one 6-broMo-4-hydroxyquinolin-2(1H)-one 54675-23-9 C9H6BrNO2
1-Bromo-9H-carbazole 1-Bromo-9H-carbazole 16807-11-7 C12H8BrN
4-broMo-2-(1,1,1-trifluoro-2-Methylpropan-2-yl)pyridine 4-broMo-2-(1,1,1-trifluoro-2-Methylpropan-2-yl)pyridine 1357476-67-5 C9H9BrF3N
1H-Indole, 4-broMo-6-chloro- 1H-Indole, 4-broMo-6-chloro- 885519-23-3 C8H5BrClN
[1,1'-Biphenyl]-4-carboxylic acid, 2'-Methyl-4'-(5-Methyl-1,2,4-oxadiazol-3-yl)- [1,1'-Biphenyl]-4-carboxylic acid, 2'-Methyl-4'-(5-Methyl-1,2,4-oxadiazol-3-yl)- 148672-68-8 C17H14N2O3
2,4-Pyridinedicarboxylic acid, 2-Methyl ester 2,4-Pyridinedicarboxylic acid, 2-Methyl ester 24195-10-6 C8H7NO4
4,8-dichloropyrido[3,4-d]pyriMidine 4,8-dichloropyrido[3,4-d]pyriMidine 1260663-37-3 C7H3Cl2N3
2-Propenoic acid, 3-[(4'-cyano[1,1'-biphenyl]-4-yl)oxy]propyl ester 2-Propenoic acid, 3-[(4'-cyano[1,1'-biphenyl]-4-yl)oxy]propyl ester 104357-57-5 C19H17NO3
6-BroMo-3-AMino-4-quinolinol 6-BroMo-3-AMino-4-quinolinol 1153094-27-9 C9H7BrN2O
2-THIOADENOSINE 2-THIOADENOSINE 43157-50-2 C10H13N5O4S
N-(4-chlorophenyl)-2-(3,5-diMethyl-1H-pyrazol-1-yl)-9-Methyl-9H-purin-6-aMine N-(4-chlorophenyl)-2-(3,5-diMethyl-1H-pyrazol-1-yl)-9-Methyl-9H-purin-6-aMine 1063331-94-1 C17H16ClN7
4-BroMo-1-(tetrahydro-2H-pyran-2-yl)-1H-indazole 4-BroMo-1-(tetrahydro-2H-pyran-2-yl)-1H-indazole 1022158-35-5 C12H13BrN2O
2-Methylpyrazolo[1,5-a]pyriMidin-5-ol 2-Methylpyrazolo[1,5-a]pyriMidin-5-ol 189116-35-6 C7H7N3O
2-BroMo-1-(pyriMidin-2-yl)ethanone hydrobroMide 2-BroMo-1-(pyriMidin-2-yl)ethanone hydrobroMide 1588441-02-4 C6H6Br2N2O
4-chloro-N-ethyl-5-(trifluoroMethyl)pyriMidin-2-aMine 4-chloro-N-ethyl-5-(trifluoroMethyl)pyriMidin-2-aMine 1374829-47-6 C7H7ClF3N3
Ethyl 2-aMinopyriMidine-4-carboxylate Ethyl 2-aMinopyriMidine-4-carboxylate 916056-77-4 C7H9N3O2
(2S,5R)-6-(benzyloxy)-7-oxo-1,6-diazabicyclo[3.2.1]octane-2-carboxamide (2S,5R)-6-(benzyloxy)-7-oxo-1,6-diazabicyclo[3.2.1]octane-2-carboxamide 1192651-49-2 C14H17N3O3
4-BROMO-3-FORMYLINDOLE-1-CARBOXYLIC ACID TERT-BUTYL ESTER 4-BROMO-3-FORMYLINDOLE-1-CARBOXYLIC ACID TERT-BUTYL ESTER 303041-88-5 C14H14BrNO3
1-(4'-Sulfophenyl)-3-carboxy-5-pyrazolone 1-(4'-Sulfophenyl)-3-carboxy-5-pyrazolone 118-47-8 C10H8N2O6S
1-PYRIDIN-2-YL-ETHYLAMINE 1-PYRIDIN-2-YL-ETHYLAMINE 42088-91-5 C7H10N2
3-(2-bromophenyl)Pyridine 3-(2-bromophenyl)Pyridine 847264-30-6 C11H8BrN
4,6-dimethyl-5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)Pyrimidine 4,6-dimethyl-5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)Pyrimidine 1430233-43-4 C12H19BN2O2
Ethyl 7-bromo-2,2-dimethylheptanoate Ethyl 7-bromo-2,2-dimethylheptanoate 123469-92-1 C11H21BrO2
6,6-difluoro-3-azabicyclo[3.1.1]heptane hydrochloride 6,6-difluoro-3-azabicyclo[3.1.1]heptane hydrochloride 1788054-81-8 C6H10ClF2N
2-methoxy-3-(1-methyl-1H-1,2,4-triazol-3-yl)aniline 2-methoxy-3-(1-methyl-1H-1,2,4-triazol-3-yl)aniline 1609394-10-6 C10H12N4O
[4-(4-aminobenzoyl)oxyphenyl] 4-aminobenzoate [4-(4-aminobenzoyl)oxyphenyl] 4-aminobenzoate 22095-98-3 C20H16N2O4
2-Amino-6-fluorobenzothiazole 2-Amino-6-fluorobenzothiazole 348-40-3 C7H5FN2S
[(1S,2R)-rel-2-(hydroxymethyl)cyclopropyl]methanol [(1S,2R)-rel-2-(hydroxymethyl)cyclopropyl]methanol 2345-68-8 C5H10O2
tert-butyl 6-oxo-2-azaspiro[4.4]nonane-2-carboxylate(WX101410) tert-butyl 6-oxo-2-azaspiro[4.4]nonane-2-carboxylate(WX101410) 1319716-43-2 C13H21NO3
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
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