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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-CHLOROBENZHYDRAZIDE 3-CHLOROBENZHYDRAZIDE 1673-47-8 C7H7ClN2O
3-Isochromanone 3-Isochromanone 4385-35-7 C9H8O2
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
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
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
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-chloro-N-ethyl-5-(trifluoroMethyl)pyriMidin-2-aMine 4-chloro-N-ethyl-5-(trifluoroMethyl)pyriMidin-2-aMine 1374829-47-6 C7H7ClF3N3
1-PYRIDIN-2-YL-ETHYLAMINE 1-PYRIDIN-2-YL-ETHYLAMINE 42088-91-5 C7H10N2
1-(4'-Sulfophenyl)-3-carboxy-5-pyrazolone 1-(4'-Sulfophenyl)-3-carboxy-5-pyrazolone 118-47-8 C10H8N2O6S
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
1-Bromo-9H-carbazole 1-Bromo-9H-carbazole 16807-11-7 C12H8BrN
1H-Indole, 4-broMo-6-chloro- 1H-Indole, 4-broMo-6-chloro- 885519-23-3 C8H5BrClN
4-AMINO-3-BROMO-6-CHLORO (1H)INDAZOLE 4-AMINO-3-BROMO-6-CHLORO (1H)INDAZOLE 885519-95-9 C7H5BrClN3
(S)-oxetan-2-ylmethanamine (S)-oxetan-2-ylmethanamine 2091328-57-1 C4H9NO
6-CHLOROACETYL-1 4-BENZODIOXANE  97 6-CHLOROACETYL-1 4-BENZODIOXANE 97 93439-37-3 C10H9ClO3
(S)-2-((trifluoromethoxy)methyl)piperazine (S)-2-((trifluoromethoxy)methyl)piperazine
(S)-2-(2-fluoroethyl)piperazine dihydrochloride (S)-2-(2-fluoroethyl)piperazine dihydrochloride
Ethyl 3-hydroxy-4-oxo-4,6,7,9-tetrahydropyrimido[2,1-c][1,4]oxazine-2-carboxylate Ethyl 3-hydroxy-4-oxo-4,6,7,9-tetrahydropyrimido[2,1-c][1,4]oxazine-2-carboxylate 870562-00-8 C10H12N2O5
3-CYANO-5-NITROINDOLE 3-CYANO-5-NITROINDOLE 7147-14-0 C9H5N3O2
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
4-Methoxypyrazolo[1,5-a]pyridine-3-carbonitrile 4-Methoxypyrazolo[1,5-a]pyridine-3-carbonitrile 2110326-74-2 C9H7N3O
4-Boc-4,7-diazaspiro[2.5]octane 4-Boc-4,7-diazaspiro[2.5]octane 674792-08-6 C11H20N2O2
1-METHYL-1,2,3,4-TETRAHYDRO-QUINOXALINE DIHYDROCHLORIDE 1-METHYL-1,2,3,4-TETRAHYDRO-QUINOXALINE DIHYDROCHLORIDE 36438-97-8 C9H12N2
4-butyl-1,2-diphenylpyrazolidine-3,5-dione, compound with piperazine (1:1) 4-butyl-1,2-diphenylpyrazolidine-3,5-dione, compound with piperazine (1:1) 4985-25-5 C23H30N4O2
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
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
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
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-Pyrimidinecarbothioamide (9CI) 2-Pyrimidinecarbothioamide (9CI) 4537-73-9 C5H5N3S
1-ethyl-1H-pyrazol-4-amine 1-ethyl-1H-pyrazol-4-amine 876343-24-7 C5H9N3
2-chloro-4,6-diphenyl-1,3,5-triazine 2-chloro-4,6-diphenyl-1,3,5-triazine 3842-55-5 C15H10ClN3
1H-Benzotriazole-5-carboxylic acid 1H-Benzotriazole-5-carboxylic acid 60932-58-3 C7H5N3O2
N-(2-HYDROXYPROPYL)MORPHOLINE N-(2-HYDROXYPROPYL)MORPHOLINE 2109-66-2 C7H15NO2
2-HYDROXY-4-METHYL-BENZOTHIOZOLE 2-HYDROXY-4-METHYL-BENZOTHIOZOLE 73443-84-2 C8H7NOS
2,5-Dibromo-1,4-phenylenediamine 2,5-Dibromo-1,4-phenylenediamine 25462-61-7 C6H6Br2N2
4,4'-Dihydroxybiphenyl-3,3'-dicarboxylic acid 4,4'-Dihydroxybiphenyl-3,3'-dicarboxylic acid 13987-45-6 C14H10O6
3-AMINO-2-CHLORO-5-FLUOROPYRIDINE 3-AMINO-2-CHLORO-5-FLUOROPYRIDINE 884495-37-8 C5H4ClFN2
O-Aminocyclo(Ser-O-amino-Ser-) O-Aminocyclo(Ser-O-amino-Ser-) 17868-49-4 C6H12N4O4
Diethyl 3-hydroxyglutarate Diethyl 3-hydroxyglutarate 32328-03-3 C9H16O5
4,5-Dihydroisoxazole 4,5-Dihydroisoxazole 504-73-4 C3H5NO
5-BROMO-1H-INDAZOL-3-AMINE 5-BROMO-1H-INDAZOL-3-AMINE 61272-71-7 C7H6BrN3
6-METHOXY-5-NITRO (1H)INDAZOLE 6-METHOXY-5-NITRO (1H)INDAZOLE 152626-75-0 C8H7N3O3
(4-Methyl-1-piperidinyl)(4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridin-3-yl)methanone HCl (4-Methyl-1-piperidinyl)(4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridin-3-yl)methanone HCl 1220029-24-2 C13H21ClN4O
2-methyloxan-4-one 2-methyloxan-4-one 1193-20-0 C6H10O2
2-(chloromethyl)-6-methylthieno[2,3-d]pyrimidin-4(3H)-one(SALTDATA: FREE) 2-(chloromethyl)-6-methylthieno[2,3-d]pyrimidin-4(3H)-one(SALTDATA: FREE) 878699-59-3 C8H7ClN2OS
2-Methyl-tetrahydro-pyran-4-ol 2-Methyl-tetrahydro-pyran-4-ol 89791-47-9 C6H12O2
2-Oxazolidinone, 5-(2,2-diMethyl-4H-1,3-benzodioxin-6-yl)-, (5R)- 2-Oxazolidinone, 5-(2,2-diMethyl-4H-1,3-benzodioxin-6-yl)-, (5R)- 452339-73-0 C13H15NO4
cis-2-Boc-hexahydropyrrolo[3,4-c]pyrrole cis-2-Boc-hexahydropyrrolo[3,4-c]pyrrole 250275-15-1 C11H20N2O2
(2-Aminophenyl)dimethylphosphine Oxide (2-Aminophenyl)dimethylphosphine Oxide 1197953-47-1 C8H12NOP
4-chloro-7-Methoxyquinoline-6-carboxaMide 4-chloro-7-Methoxyquinoline-6-carboxaMide 417721-36-9 C11H9ClN2O2
4-chloro-2-(4-pyridyl)-6-(trifluoroMethyl)pyriMidine 4-chloro-2-(4-pyridyl)-6-(trifluoroMethyl)pyriMidine 204394-70-7 C10H5ClF3N3
6-BroMo-pyrazolo[1,5-a]pyridine-3-carboxylic acid 6-BroMo-pyrazolo[1,5-a]pyridine-3-carboxylic acid 1211596-19-8 C8H5BrN2O2
3,5-Dioxo-piperidine-1-carboxylicacidtert-butylester 3,5-Dioxo-piperidine-1-carboxylicacidtert-butylester 396731-40-1 C10H15NO4
2-(tert-Butyl)-4-chloro-5-nitropyriMidine 2-(tert-Butyl)-4-chloro-5-nitropyriMidine 70227-50-8 C8H10ClN3O2
2-Bromo-5-ethynylpyridine 2-Bromo-5-ethynylpyridine 569672-28-2 C7H4BrN
((3AS,5R,6S,6aS)-6-hydroxy-2,2-dimethyltetrahydrofuro[2,3-d][1,3]dioxol-5-yl)(morpholino)methanone ((3AS,5R,6S,6aS)-6-hydroxy-2,2-dimethyltetrahydrofuro[2,3-d][1,3]dioxol-5-yl)(morpholino)methanone 1103738-19-7 C12H19NO6
N,N'-bis(2,6-DiMethylphenyl)-1,4-piperazinediacetaMide N,N'-bis(2,6-DiMethylphenyl)-1,4-piperazinediacetaMide 380204-72-8 C24H32N4O2
2-Chloro-5-methoxy-4-methylpyrimidine 2-Chloro-5-methoxy-4-methylpyrimidine 1245506-61-9 C6H7ClN2O
5,6,7,8-TETRAHYDROIMIDAZO[1,2-A]PYRIMIDINE 5,6,7,8-TETRAHYDROIMIDAZO[1,2-A]PYRIMIDINE 67139-22-4 C6H9N3
2-Ethyl-4-methylimidazole 2-Ethyl-4-methylimidazole 931-36-2 C6H10N2
4,4',4'',4'''-(pyrene-1,3,6,8-tetrayl)tetrabenzaldehyde 4,4',4'',4'''-(pyrene-1,3,6,8-tetrayl)tetrabenzaldehyde 1415238-25-3 C44H26O4
Dibenzoyl-D-tartaric acid Dibenzoyl-D-tartaric acid 17026-42-5 C18H14O8
(3-(dibenzo[b,d]furan-4-yl)phenyl)boronic acid (3-(dibenzo[b,d]furan-4-yl)phenyl)boronic acid 1271726-52-3 C18H13BO3
3-Maleimidopropionic acid 3-Maleimidopropionic acid 7423-55-4 C7H7NO4
2-phenylpyrimidine-4-carbaldehyde 2-phenylpyrimidine-4-carbaldehyde 1014-07-9 C11H8N2O
2,6-DICHLORO-3-NITROBENZONITRILE 2,6-DICHLORO-3-NITROBENZONITRILE 5866-98-8 C7H2Cl2N2O2
6-Methoxy-1H-indole-3-carboxylic acid 6-Methoxy-1H-indole-3-carboxylic acid 90924-43-9 C10H9NO3
6-BROMO-1H-PYRROLO[2,3-B]PYRIDINE 6-BROMO-1H-PYRROLO[2,3-B]PYRIDINE 143468-13-7 C7H5BrN2
3-BROMO-PYRAZOLO[1,5-A]PYRIDINE 3-BROMO-PYRAZOLO[1,5-A]PYRIDINE 5910-12-3 C7H5BrN2
2-Chloroquinazoline 2-Chloroquinazoline 6141-13-5 C8H5ClN2
Pyrrolo[1,2-a]pyrazin-1(2H)-one (9CI) Pyrrolo[1,2-a]pyrazin-1(2H)-one (9CI) 136927-63-4 C7H6N2O
Methyl 1H-indazole-5-carboxylate Methyl 1H-indazole-5-carboxylate 473416-12-5 C9H8N2O2
(+)-(1R,5S)-2-Oxabicyclo[3.3.0]oct-6-en-3-one (+)-(1R,5S)-2-Oxabicyclo[3.3.0]oct-6-en-3-one 26054-46-6 C7H8O2
	4-isothiocyanato-2-(trifluoroMethyl)benzonitrile 4-isothiocyanato-2-(trifluoroMethyl)benzonitrile 143782-23-4 C9H3F3N2S
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