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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
(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
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
(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
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
2-Methyl-5-nitroimidazole 2-Methyl-5-nitroimidazole 88054-22-2 C4H5N3O2
4,6-Dimethoxypyrimidin-5-methyl amine 4,6-Dimethoxypyrimidin-5-methyl amine 1118786-90-5 C7H11N3O2
(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
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
2-Dimethylamino-pyrimidine-5-boronic acid pinacol ester 2-Dimethylamino-pyrimidine-5-boronic acid pinacol ester 1032759-30-0 C12H20BN3O2
1,4-Bis(4-amino-2-trifluoromethylphenoxy)benzene 1,4-Bis(4-amino-2-trifluoromethylphenoxy)benzene 94525-05-0 C20H14F6N2O2
(R)-3-Methylmorpholine (R)-3-Methylmorpholine 74572-04-6 C5H11NO
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
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
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
2-N-UNDECYLIMIDAZOLE 2-N-UNDECYLIMIDAZOLE 16731-68-3 C14H26N2
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
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
2-[(2-ethoxyphenoxy)methyl]morpholine hydrochloride 2-[(2-ethoxyphenoxy)methyl]morpholine hydrochloride 35604-67-2 C13H20ClNO3
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-AMINO-3-BROMO-6-CHLORO (1H)INDAZOLE 4-AMINO-3-BROMO-6-CHLORO (1H)INDAZOLE 885519-95-9 C7H5BrClN3
3-CYANO-5-NITROINDOLE 3-CYANO-5-NITROINDOLE 7147-14-0 C9H5N3O2
Nandrolone undecylate Nandrolone undecylate 862-89-5 C29H46O3
4'-(4-BROMOPHENYL)-2,2':6',2''-TERPYRIDINE 4'-(4-BROMOPHENYL)-2,2':6',2''-TERPYRIDINE 89972-76-9 C21H14BrN3
2-(4-METHOXY-PHENYL)-PYRROLIDINE 2-(4-METHOXY-PHENYL)-PYRROLIDINE 74190-66-2 C11H15NO
5-CHLORO-3H-IMIDAZO[4,5-B]PYRIDINE 5-CHLORO-3H-IMIDAZO[4,5-B]PYRIDINE 52090-89-8 C6H4ClN3
2-AMINO-5-CHLOROBENZOTHIAZOLE 2-AMINO-5-CHLOROBENZOTHIAZOLE 20358-00-3 C7H5ClN2S
1,2,5-oxadiazole 1,2,5-oxadiazole 288-37-9 C2H2N2O
4-Oxazolidinecarboxylicacid,2-oxo-,methylester,(4R)-(9CI) 4-Oxazolidinecarboxylicacid,2-oxo-,methylester,(4R)-(9CI) 144542-43-8 C5H7NO4
5-FLUORO-1H-PYRROLO[2,3-B]PYRIDINE 5-FLUORO-1H-PYRROLO[2,3-B]PYRIDINE 866319-00-8 C7H5FN2
2-Methoxy-6-(methylamino)pyridine 2-Methoxy-6-(methylamino)pyridine 88569-83-9 C7H10N2O
Dimethyl cyclopentane-1,3-dicarboxylate Dimethyl cyclopentane-1,3-dicarboxylate 2435-36-1 C9H14O4
2-BROMO-7-METHYL-5H-[1,3,4]THIADIAZOLO[3,2-A]PYRIMIDIN-5-ONE 2-BROMO-7-METHYL-5H-[1,3,4]THIADIAZOLO[3,2-A]PYRIMIDIN-5-ONE 139535-51-6 C6H4BrN3OS
1,2,4-thiadiazole 1,2,4-thiadiazole 288-92-6 C2H2N2S
3-CHLORO-2-NITROBENZALDEHYDE 3-CHLORO-2-NITROBENZALDEHYDE 22233-52-9 C7H4ClNO3
3-(2-FURYL)PROPANOIC ACID 3-(2-FURYL)PROPANOIC ACID 935-13-7 C7H8O3
6-Chloro-1,3-dihydro-2H-pyrrolo[3,2-c]pyridin-2-one 6-Chloro-1,3-dihydro-2H-pyrrolo[3,2-c]pyridin-2-one 1000342-80-2 C7H5ClN2O
4,5-DICHLORO-QUINOLINE 4,5-DICHLORO-QUINOLINE 21617-18-5 C9H5Cl2N
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
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
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
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
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
ethyl-2,2-dimethyl-7-bromoheptanoate ethyl-2,2-dimethyl-7-bromoheptanoate 123469-92-1 C11H21BrO2
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
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
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