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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
8-Chloro-3-iodoimidazo[1,2-a]pyrazine 8-Chloro-3-iodoimidazo[1,2-a]pyrazine 1049677-32-8 C6H3ClIN3
ETHYL 2-(3-FORMYL-4-ISOBUTOXYPHENYL)-4-METHYLTHIAZOLE-5-CARBOXYLATE ETHYL 2-(3-FORMYL-4-ISOBUTOXYPHENYL)-4-METHYLTHIAZOLE-5-CARBOXYLATE 161798-03-4 C18H21NO4S
METHYL 5-BROMO-1H-INDAZOLE-3-CARBOXYLATE METHYL 5-BROMO-1H-INDAZOLE-3-CARBOXYLATE 78155-74-5 C9H7BrN2O2
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-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
5,6,7,9-Tetrahydro-8H-pyrido[2,3-b]azepin-8-one 5,6,7,9-Tetrahydro-8H-pyrido[2,3-b]azepin-8-one 67046-22-4 C9H10N2O
cis-2-Boc-hexahydropyrrolo[3,4-c]pyrrole cis-2-Boc-hexahydropyrrolo[3,4-c]pyrrole 250275-15-1 C11H20N2O2
3-Bromo-5-fluoropyridine-2-carbonitrile 3-Bromo-5-fluoropyridine-2-carbonitrile 950670-18-5 C6H2BrFN2
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
PAG108-Octane sulfonyl PAG108-Octane sulfonyl 852246-54-9 C21H26N2O3S2
1,4'-Bipiperidine dihydrochloride 1,4'-Bipiperidine dihydrochloride 4876-60-2 C10H22Cl2N2
2-Methyl-tetrahydro-pyran-4-ol 2-Methyl-tetrahydro-pyran-4-ol 89791-47-9 C6H12O2
7-(4-methylpiperazin-1-yl)-2-(4-(trifluoromethyl)phenyl)oxazolo[5,4-d]pyrimidine 7-(4-methylpiperazin-1-yl)-2-(4-(trifluoromethyl)phenyl)oxazolo[5,4-d]pyrimidine C17H16F3N5O
4-chloro-2-(4-chlorophenyl)oxazolo[4,5-c]quinoline 4-chloro-2-(4-chlorophenyl)oxazolo[4,5-c]quinoline C16H8Cl2N2O
Tetrahydrofurfuryl bromide Tetrahydrofurfuryl bromide 1192-30-9 C5H9BrO
K-11777 K-11777 233277-99-1 C32H38N4O4S
2,5-Oxazolidinedione, 3,4-dimethyl- 2,5-Oxazolidinedione, 3,4-dimethyl- 51784-00-0 C5H7NO3
5-Amino-1-methylquinolinium chloride 5-Amino-1-methylquinolinium chloride 42464-96-0 C10H11N2.I
(R)-2-((trifluoromethoxy)methyl)piperazine dihydrochloride (R)-2-((trifluoromethoxy)methyl)piperazine dihydrochloride
(R)-2-(2,2-difluoroethyl)piperazine (R)-2-(2,2-difluoroethyl)piperazine
(R)-2-(2,2-difluoroethyl)piperazine dihydrochloride (R)-2-(2,2-difluoroethyl)piperazine dihydrochloride
1,3-Bis[(1S)-1-phenylethyl]-1H-imidazolium Tetrafluoroborate 1,3-Bis[(1S)-1-phenylethyl]-1H-imidazolium Tetrafluoroborate 613686-48-9 C19H21BF4N2
3-CHLOROPHTHALIC ANHYDRIDE 3-CHLOROPHTHALIC ANHYDRIDE 117-21-5 C8H3ClO3
N-BOC-1,2,3,6-TETRAHYDROPYRIDINE N-BOC-1,2,3,6-TETRAHYDROPYRIDINE 85838-94-4 C10H17NO2
7-BROMO-1H-INDOLE-3-CARBOXYLIC ACID 7-BROMO-1H-INDOLE-3-CARBOXYLIC ACID 86153-25-5 C9H6BrNO2
4-BROMO-8-METHOXYQUINOLINE 4-BROMO-8-METHOXYQUINOLINE 103028-31-5 C10H8BrNO
BOC-THIONOPHE-1-(6-NITRO)BENZOTRIAZOLIDE BOC-THIONOPHE-1-(6-NITRO)BENZOTRIAZOLIDE 184951-87-9 C20H21N5O4S
Ethyl 5-cyanoindole-2-carboxylate Ethyl 5-cyanoindole-2-carboxylate 105191-13-7 C12H10N2O2
6-Chloro-1-tetralone 6-Chloro-1-tetralone 26673-31-4 C10H9ClO
5-AMINO-3-(4-METHOXYPHENYL)PYRAZOLE 5-AMINO-3-(4-METHOXYPHENYL)PYRAZOLE 19541-95-8 C10H11N3O
1-Ethylimidazole 1-Ethylimidazole 7098-07-9 C5H8N2
2-(1H-Imidazol-1-yl)terephthalic acid 2-(1H-Imidazol-1-yl)terephthalic acid 2087947-57-5 C11H8N2O4
2-Bromo-4-nitroimidazole 2-Bromo-4-nitroimidazole 65902-59-2 C3H2BrN3O2
L-Valine, 3-methyl-N-(trifluoroacetyl)- (9CI) L-Valine, 3-methyl-N-(trifluoroacetyl)- (9CI) 666832-71-9 C8H12F3NO3
Glycine, L-α-glutamylglycyl-L-threonyl-L-phenylalanyl-L-threonyl-L-seryl-L-α-aspartyl-L-valyl-L-seryl-L-seryl-L-tyrosyl-L-leucyl-L-α-glutamylglycyl-L-glutaminyl-L-alanyl-L-alanyl-L-lysyl-L-α-glutamyl-L-phenylalanyl-L-isoleucyl-L-alanyl-L-tryptophyl-L-leucyl-L-valyl-L-arginylglycyl-L-arginyl- Glycine, L-α-glutamylglycyl-L-threonyl-L-phenylalanyl-L-threonyl-L-seryl-L-α-aspartyl-L-valyl-L-seryl-L-seryl-L-tyrosyl-L-leucyl-L-α-glutamylglycyl-L-glutaminyl-L-alanyl-L-alanyl-L-lysyl-L-α-glutamyl-L-phenylalanyl-L-isoleucyl-L-alanyl-L-tryptophyl-L-leucyl-L-valyl-L-arginylglycyl-L-arginyl- 1169630-82-3 C142H216N38O45
5-bromo-1,10-phenanthroline 5-bromo-1,10-phenanthroline 40000-20-2 C12H7BrN2
ditetradecylamine ditetradecylamine 17361-44-3 C28H59N
2-Chloro-5-hydroxypyrimidine 2-Chloro-5-hydroxypyrimidine 4983-28-2 C4H3ClN2O
THIAMINE MONOPHOSPHATE CHLORIDE*DIHYDRAT E THIAMINE MONOPHOSPHATE CHLORIDE*DIHYDRAT E 273724-21-3 C12H18N4O4PS.Cl.2H2O
L-Prolinamide, β-alanyl-3-methyl-L-valyl-4-hydroxy-N-[[4-(4-methyl-5-thiazolyl)phenyl]methyl]-, (4R)- L-Prolinamide, β-alanyl-3-methyl-L-valyl-4-hydroxy-N-[[4-(4-methyl-5-thiazolyl)phenyl]methyl]-, (4R)- 2241643-69-4 C25H35N5O4S
Piperazine, 1,2,2-trimethyl- (9CI) Piperazine, 1,2,2-trimethyl- (9CI) 396133-32-7 C7H16N2
2-Pyrimidinecarbothioamide (9CI) 2-Pyrimidinecarbothioamide (9CI) 4537-73-9 C5H5N3S
5-Nitro-2-pentanone 5-Nitro-2-pentanone 22020-87-7 C5H9NO3
6-Methyl-1H-pyrazolo[3,4-b]pyridine 6-Methyl-1H-pyrazolo[3,4-b]pyridine 885269-66-9 C7H7N3
4-AMINOPHENYLSULFUR PENTAFLUORIDE 4-AMINOPHENYLSULFUR PENTAFLUORIDE 2993-24-0 C6H6F5NS
1H-Indole-2-carboxylic acid, 5-[(4S)-tetrahydro-2,2-dimethyl-2H-pyran-4-yl]- 1H-Indole-2-carboxylic acid, 5-[(4S)-tetrahydro-2,2-dimethyl-2H-pyran-4-yl]- 2212021-78-6 C16H19NO3
4,8-Dibromoquinoline 4,8-Dibromoquinoline 1070879-31-0 C9H5Br2N
3,5-Methanocyclopent[d]-1,2-oxathiol-6-ol,hexahydro-,2,2-dioxide(9CI) 3,5-Methanocyclopent[d]-1,2-oxathiol-6-ol,hexahydro-,2,2-dioxide(9CI) 15486-54-1 C7H10O4S
Baloxavir Impurity Baloxavir Impurity 3047100-03-5 C27H23F2N3O7S
2-methyloxan-4-one 2-methyloxan-4-one 1193-20-0 C6H10O2
1,1-Dimethylethyl (6bR,10aS)-2,3,6b,9,10,10a-hexahydro-3-methyl-1H-pyrido[3′,4′:4,5]pyrrolo[1,2,3-de]quinoxaline-8(7H)-carboxylate 1,1-Dimethylethyl (6bR,10aS)-2,3,6b,9,10,10a-hexahydro-3-methyl-1H-pyrido[3′,4′:4,5]pyrrolo[1,2,3-de]quinoxaline-8(7H)-carboxylate 2566614-63-7 C19H27N3O2
2-Ethyl-4-methyl-1H-imidazole-1-propanenitrile 2-Ethyl-4-methyl-1H-imidazole-1-propanenitrile 23996-25-0 C9H13N3
5-BROMO-2-CHLOROBENZOTHIAZOLE 5-BROMO-2-CHLOROBENZOTHIAZOLE 824403-26-1 C7H3BrClNS
1-Chloro-1H-pyrrolo[1,2-a]pyrazine 1-Chloro-1H-pyrrolo[1,2-a]pyrazine 136927-64-5 C7H5ClN2
5-CHLORO-1H-PYRROLO[2,3-C]PYRIDINE 5-CHLORO-1H-PYRROLO[2,3-C]PYRIDINE 131084-55-4 C7H5ClN2
6-Amino-2,2-dimethyl-2H-pyrido[3,2-B][1,4]oxazin-3(4H)-one 6-Amino-2,2-dimethyl-2H-pyrido[3,2-B][1,4]oxazin-3(4H)-one 1002726-62-6 C9H11N3O2
1-Cyclopropyl-6-fluoro-1,4-dihydro-8-hydroxy-7-[(4aS,7aS)-octahydro-6H-pyrrolo[3,4-b]pyridin-6-yl]-4-oxo-3-quinolinecarboxylic acid 1-Cyclopropyl-6-fluoro-1,4-dihydro-8-hydroxy-7-[(4aS,7aS)-octahydro-6H-pyrrolo[3,4-b]pyridin-6-yl]-4-oxo-3-quinolinecarboxylic acid 721970-36-1 C20H22FN3O4
1,4-Bis(benzhydryl)piperazine Dihydrochloride 1,4-Bis(benzhydryl)piperazine Dihydrochloride 56265-29-3 C30H32Cl2N2
6-BroMo-5-chloro-pyridine-2-carboxylic acid 6-BroMo-5-chloro-pyridine-2-carboxylic acid 1214328-42-3 C6H3BrClNO2
tert-butyl 4-(1H-benzo[d]iMidazol-2-yl)piperidine-1-carboxylate tert-butyl 4-(1H-benzo[d]iMidazol-2-yl)piperidine-1-carboxylate 953071-73-3 C17H23N3O2
3-Methylsulfonyl-azetidine hydrochloride 3-Methylsulfonyl-azetidine hydrochloride 1400764-60-4 C4H10ClNO2S
4-CHLORO-8-METHOXY-2-METHYLQUINOLINE 4-CHLORO-8-METHOXY-2-METHYLQUINOLINE 64951-58-2 C11H10ClNO
Piperazine, 1-(cyclopropylcarbonyl)-, Monohydrochloride Piperazine, 1-(cyclopropylcarbonyl)-, Monohydrochloride 1021298-67-8 C8H15ClN2O
tert-butyl (1R,2S,5S)-2-aMino-5-(diMethylcarbaMoyl)cyclohexylcarbaMate tert-butyl (1R,2S,5S)-2-aMino-5-(diMethylcarbaMoyl)cyclohexylcarbaMate 365998-36-3 C14H27N3O3
5-MethoxypicoliniMidaMide hydrochloride 5-MethoxypicoliniMidaMide hydrochloride 1179359-60-4 C7H10ClN3O
2-(2-butyl-4-hydroxy-6-MethylpyriMidin-5-yl)-N,N-diMethylacetaMide 2-(2-butyl-4-hydroxy-6-MethylpyriMidin-5-yl)-N,N-diMethylacetaMide 1315478-13-7 C13H21N3O2
2-Chloro-4-iodo-6-Methoxy-pyridine 2-Chloro-4-iodo-6-Methoxy-pyridine 1227602-76-7 C6H5ClINO
	2-Chloro-7-cyclopentyl-N,N-dimethyl-H-pyrrolo[2,3-d]pyrimidine-6-carboxamide 2-Chloro-7-cyclopentyl-N,N-dimethyl-H-pyrrolo[2,3-d]pyrimidine-6-carboxamide 1211443-61-6 C14H17ClN4O
1-[2-Chloro-1-hydroxy-3-(6-quinolinyl)propyl]-2,5-pyrrolidinedione 1-[2-Chloro-1-hydroxy-3-(6-quinolinyl)propyl]-2,5-pyrrolidinedione 1197377-31-3 C16H15ClN2O3
4-(1-BroMo-ethyl)-benzoic acid Methyl ester 4-(1-BroMo-ethyl)-benzoic acid Methyl ester 16281-97-3 C10H11BrO2
2-chloro-4,6-di(naphthalen-1-yl)-1,3,5-triazine 2-chloro-4,6-di(naphthalen-1-yl)-1,3,5-triazine 78941-32-9 C23H14ClN3
tert-Butyl 6-oxo-5-oxa-2,7-diazaspiro[3.4]octane-2-carboxylate tert-Butyl 6-oxo-5-oxa-2,7-diazaspiro[3.4]octane-2-carboxylate 1799438-98-4 C10H16N2O4
2-Chloro-5-(trifluoromethyl)benzyl alcohol 2-Chloro-5-(trifluoromethyl)benzyl alcohol 64372-62-9 C8H6ClF3O
(3-Bromophenyl)triphenylsilane (3-Bromophenyl)triphenylsilane 185626-73-7 C24H19BrSi
1-methyl-3-((methylamino)methyl)-1H-pyrazole-5-carbonitrilehydrochloride 1-methyl-3-((methylamino)methyl)-1H-pyrazole-5-carbonitrilehydrochloride 1643141-20-1 C7H11ClN4
4-Fluoro-3,5-dimethylphenylaceticacid 4-Fluoro-3,5-dimethylphenylaceticacid 1000544-58-0 C10H11FO2
3-Bromo-4,5-dichlorotoluene 3-Bromo-4,5-dichlorotoluene 960305-14-0 C7H5BrCl2
1-Ethyl-1-cyclohexyl acrylate 1-Ethyl-1-cyclohexyl acrylate 251909-25-8 C11H18O2
1-(1-(1H-imidazole-1-carbonyl)piperidin-4-yl)-1H-imidazo[4,5-b]pyridin-2(3H)-one 1-(1-(1H-imidazole-1-carbonyl)piperidin-4-yl)-1H-imidazo[4,5-b]pyridin-2(3H)-one 1373116-06-3 C15H16N6O2
Methanone,di-1H-pyrrol-2-yl- Methanone,di-1H-pyrrol-2-yl- 15770-21-5 C9H8N2O
4-Bromo-3-fluorobenzenesulfonyl chloride 4-Bromo-3-fluorobenzenesulfonyl chloride 351003-51-5 C6H3BrClFO2S
6-METHYLINDOLE-3-CARBOXALDEHYDE 6-METHYLINDOLE-3-CARBOXALDEHYDE 4771-49-7 C10H9NO
pyrrolo[1,2-b]pyridazine-3-carbonitrile pyrrolo[1,2-b]pyridazine-3-carbonitrile 1803184-79-3 C8H5N3
SR17018 SR17018 2134602-45-0 C19H18Cl3N3O
1-(4-FLUOROPHENYL)PIPERAZINE HYDROCHLORIDE 1-(4-FLUOROPHENYL)PIPERAZINE HYDROCHLORIDE 16141-90-5 C10H14ClFN2
CBZ-L-ALANINOL CBZ-L-ALANINOL 66674-16-6 C11H15NO3
METHYL 2-(BIS[(TERT-BUTOXY)CARBONYL]AMINO)PROP-2-ENOATE(WXG03125) METHYL 2-(BIS[(TERT-BUTOXY)CARBONYL]AMINO)PROP-2-ENOATE(WXG03125) 201338-62-7 C14H23NO6
6-AMINO-2-OXA-SPIRO[3.3]HEPTANE HYDROCHLORIDE 6-AMINO-2-OXA-SPIRO[3.3]HEPTANE HYDROCHLORIDE 1523618-04-3 C6H12ClNO
3-(3-Indolyl)-2-oxopropanoic acid 3-(3-Indolyl)-2-oxopropanoic acid 392-12-1 C11H9NO3
2-AMINO-8-CHLOROPYRIDO[3,4-D]PYRIMIDIN-4(3H)-ONE 2-AMINO-8-CHLOROPYRIDO[3,4-D]PYRIMIDIN-4(3H)-ONE 1413424-77-7 C7H5ClN4O
D-Lysergic Acid Methyl Ester D-Lysergic Acid Methyl Ester 4579-64-0 C17H18N2O2
2,3-DIHYDROXYPROPYL ACRYLATE 2,3-DIHYDROXYPROPYL ACRYLATE 10095-20-2 C6H10O4
10-Methoxyiminostilbene 10-Methoxyiminostilbene 4698-11-7 C15H13NO
(5-CHLORO-1H-BENZOIMIDAZOL-2-YL)-ACETIC ACID (5-CHLORO-1H-BENZOIMIDAZOL-2-YL)-ACETIC ACID 53350-32-6 C9H7ClN2O2
3-(N-1-TRITYL-IMIDAZOL-4-YL)PROPIONIC ACID 3-(N-1-TRITYL-IMIDAZOL-4-YL)PROPIONIC ACID 160446-35-5 C25H22N2O2
6-CHLORO-2-METHYLINDOLE 6-CHLORO-2-METHYLINDOLE 6127-17-9 C9H8ClN
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