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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
2-Bromo-6-(3-tolyl)pyrazine 2-Bromo-6-(3-tolyl)pyrazine 1086383-08-5 C11H9BrN2
2-Bromo-6-(4-tetrahydropyranyl)pyrazine 2-Bromo-6-(4-tetrahydropyranyl)pyrazine 1353854-11-1 C9H11BrN2O
2-Bromo-6-(iso-propoxy)pyrazine 2-Bromo-6-(iso-propoxy)pyrazine 1027512-85-1 C7H9BrN2O
2-Bromo-6-(N-Boc-piperidin-3-yl)pyrazine 2-Bromo-6-(N-Boc-piperidin-3-yl)pyrazine 1563530-77-7 C14H20BrN3O2
2-bromo-6-(tetrahydro-2H-pyran-2-yl)pyridine 2-bromo-6-(tetrahydro-2H-pyran-2-yl)pyridine 1399481-85-6 C10H12BrNO
2-CHLORO-4-AMINO-3-(3-CYANOPHENYL)PYRIDINE 2-CHLORO-4-AMINO-3-(3-CYANOPHENYL)PYRIDINE 1563529-30-5 C12H8ClN3
2-Chloro-4-amino-5-ethylpyridine 2-Chloro-4-amino-5-ethylpyridine 1381935-25-6 C7H9ClN2
2-Chloro-4-amino-6-(2-methoxyphenyl)pyrimidine 2-Chloro-4-amino-6-(2-methoxyphenyl)pyrimidine 1353854-47-3 C11H10ClN3O
2-Chloro-5-(cyclohexyloxy)pyrimidine 2-Chloro-5-(cyclohexyloxy)pyrimidine 1363254-12-9 C10H13ClN2O
2-Chloro-5-(iso-butyl)thiazole 2-Chloro-5-(iso-butyl)thiazole 1563528-55-1 C7H10ClNS
2-chloro-6-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyrazine-3,5-d2 2-chloro-6-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyrazine-3,5-d2 2241876-77-5 C10H14BClN2O2
2-CYCLOPROPYL-THIOPHENE 2-CYCLOPROPYL-THIOPHENE 29481-22-9 C7H8S
2-Hydroxy-4-(3-pyridyl)pyridine 2-Hydroxy-4-(3-pyridyl)pyridine 1159816-56-4 C10H8N2O
2-Hydroxy-4-(n-propyl)pyridine 2-Hydroxy-4-(n-propyl)pyridine 1159817-29-4 C8H11NO
2-Hydroxy-4-methylthiophene 2-Hydroxy-4-methylthiophene 35983-75-6 C5H6OS
2-Hydroxy-6-(3,5-difluorophenyl)pyridine 2-Hydroxy-6-(3,5-difluorophenyl)pyridine 1111110-90-7 C11H7F2NO
2-Hydroxy-6-(3-methoxyphenyl)pyrazine 2-Hydroxy-6-(3-methoxyphenyl)pyrazine 1159819-52-9 C11H10N2O2
2-Hydroxy-6-(4-methoxyphenyl)pyrazine 2-Hydroxy-6-(4-methoxyphenyl)pyrazine 1159815-72-1 C11H10N2O2
3-cyclopropylpyridin-4-aMine 3-cyclopropylpyridin-4-aMine 1338998-82-5 C8H10N2
8-Methylquinoline N-oxide 8-Methylquinoline N-oxide 4053-38-7 C10H9NO
1-Phenyl-1H-iMidazol-2-aMine 1-Phenyl-1H-iMidazol-2-aMine 21722-08-7 C9H9N3
2-(Furan-2-yl)pyriMidin-4-aMine 2-(Furan-2-yl)pyriMidin-4-aMine 27130-93-4 C8H7N3O
2-BroMo-5-(tert-butoxy)pyrazine 2-BroMo-5-(tert-butoxy)pyrazine 1159816-36-0 C8H11BrN2O
5-(3-Chlorophenyl)thiazol-2-aMine 5-(3-Chlorophenyl)thiazol-2-aMine 1249447-08-2 C9H7ClN2S
3-Amino-6-(4-trifluoromethylphenyl)pyridazine 3-Amino-6-(4-trifluoromethylphenyl)pyridazine 1215073-83-8 C11H8F3N3
2,6-di-tert-butyl-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridine 2,6-di-tert-butyl-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridine 1392146-23-4 C19H32BNO2
4-BROMO-2-ETHOXYPYRIDINE 4-BROMO-2-ETHOXYPYRIDINE 57883-26-8 C7H8BrNO
2-cyclopropyl-6-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyrazine 2-cyclopropyl-6-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyrazine 1412905-41-9 C13H19BN2O2
4-bromo-2-(methoxymethyl)pyridine 4-bromo-2-(methoxymethyl)pyridine 864412-04-4 C7H8BrNO
(R)-tert-Butyl 2-methyl-1,4-diazepane-1-carboxylate (R)-tert-Butyl 2-methyl-1,4-diazepane-1-carboxylate 1374130-05-8 C11H22N2O2
(Z)-2-cyanoethyl 2-(4-cyano-2-methoxybenzylidene)-3-oxobutanoate (Z)-2-cyanoethyl 2-(4-cyano-2-methoxybenzylidene)-3-oxobutanoate 1050477-39-8 C16H14N2O4
4-(1-((benzyloxy)methyl)-5-(pyridin-4-yl)-1H-1,2,4-triazol-3-yl)picolinonitrile 4-(1-((benzyloxy)methyl)-5-(pyridin-4-yl)-1H-1,2,4-triazol-3-yl)picolinonitrile 837371-70-7 C21H16N6O
2-amino-5-nitro-4,6-pyrimidinedione 2-amino-5-nitro-4,6-pyrimidinedione 301315-87-7 C4H4N4O4
2,4-Dibromo-5-chloropyridine 2,4-Dibromo-5-chloropyridine 875232-70-5 C5H2Br2ClN
2-Bromo-4-methoxy-6-methylpyrimidine 2-Bromo-4-methoxy-6-methylpyrimidine 56545-10-9 C6H7BrN2O
5-Bromo-2,4'-bipyridine 5-Bromo-2,4'-bipyridine 106047-33-0 C10H7BrN2
1,4-dimethyl-1H-imidazol-2-amine 1,4-dimethyl-1H-imidazol-2-amine 1314929-96-8 C5H9N3
3-tert-butyl-1H-imidazol-2(3H)-one 3-tert-butyl-1H-imidazol-2(3H)-one 92075-17-7 C7H12N2O
ethyl 6-bromobenzofuran-3-carboxylate ethyl 6-bromobenzofuran-3-carboxylate 1260799-56-1 C11H9BrO3
4-ethyl-2(1H)-Pyridinone 4-ethyl-2(1H)-Pyridinone 37529-91-2 C7H9NO
2-bromo-5-propoxypyridine 2-bromo-5-propoxypyridine 1144110-15-5 C8H10BrNO
2-bromo-4-cyclopropylPyrimidine 2-bromo-4-cyclopropylPyrimidine 1215073-11-2 C7H7BrN2
3-bromo-4-isobutylpyridine 3-bromo-4-isobutylpyridine 1240287-15-3 C9H12BrN
2,4,5-tribromoPyrimidine 2,4,5-tribromoPyrimidine 1298101-40-2 C4HBr3N2
2-(1-piperidinyl)-6-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)Pyrazine 2-(1-piperidinyl)-6-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)Pyrazine 1309981-53-0 C15H24BN3O2
2-Hydroxy-6-ethylpyrazine 2-Hydroxy-6-ethylpyrazine 143054-84-6 C6H8N2O
2-methoxy-N,N-dimethyl-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-imidazole-1-sulfonamide 2-methoxy-N,N-dimethyl-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-imidazole-1-sulfonamide 2256758-47-9 C12H22BN3O5S
2-methyl-1-(o-tolyl)-1H-imidazol-4-amine 2-methyl-1-(o-tolyl)-1H-imidazol-4-amine 1782627-94-4 C11H13N3
2-oxo-5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1,2-dihydropyridine-3-carbonitrile 2-oxo-5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1,2-dihydropyridine-3-carbonitrile 2256755-07-2 C12H15BN2O3
3-(2-(methyl-d3)-1H-imidazol-1-yl-4,5-d2)benzen-2,4,5,6-d4-amine 3-(2-(methyl-d3)-1H-imidazol-1-yl-4,5-d2)benzen-2,4,5,6-d4-amine 2256713-03-6 C10H2D9N3
3-(2-bromo-5-cyclopropylphenyl)tetrahydro-2H-pyran 3-(2-bromo-5-cyclopropylphenyl)tetrahydro-2H-pyran 2222934-03-2 C14H17BrO
3-(3-BROMOPHENYL)PIPERIDINE 3-(3-BROMOPHENYL)PIPERIDINE 1203682-58-9 C11H14BrN
3-(N-Boc-Piperidin-3-yl)-5-methoxy-1-bromobenzene 3-(N-Boc-Piperidin-3-yl)-5-methoxy-1-bromobenzene 1563529-15-6 C17H24BrNO3
3-(N-Boc-Piperidin-4-yl)-4-methyl-1-bromobenzene 3-(N-Boc-Piperidin-4-yl)-4-methyl-1-bromobenzene 1563529-24-7 C17H24BrNO2
4,6-DICHLORO-2-(3-PYRIDINYL)PYRIMIDINE 4,6-DICHLORO-2-(3-PYRIDINYL)PYRIMIDINE 89508-47-4 C9H5Cl2N3
2-broMo-6-(trifluoroMethyl)pyrazine 2-broMo-6-(trifluoroMethyl)pyrazine 1197237-95-8 C5H2BrF3N2
3-BroMo-4-(1H-pyrrol-1-yl)pyridine 3-BroMo-4-(1H-pyrrol-1-yl)pyridine 1019117-09-9 C9H7BrN2
2-fluoro-6-Methylpyridin-4-ol 2-fluoro-6-Methylpyridin-4-ol 1227577-13-0 C6H6FNO
4-(piperidin-1-yl)pyridin-3-aMine 4-(piperidin-1-yl)pyridin-3-aMine 52311-36-1 C10H15N3
5,6-diMethoxybenzo[c]isoxazole 5,6-diMethoxybenzo[c]isoxazole 148495-00-5 C9H9NO3
IMidazo[1,2-a]pyridine, 5-chloro-7-iodo- IMidazo[1,2-a]pyridine, 5-chloro-7-iodo- 1266656-98-7 C7H4ClIN2
2-broMo-5-cyclopropylpyridine 2-broMo-5-cyclopropylpyridine 1142197-14-5 C8H8BrN
2-CHLORO-5-FLUORO-4-METHOXY-6-METHYLPYRIMIDINE 2-CHLORO-5-FLUORO-4-METHOXY-6-METHYLPYRIMIDINE 1192479-35-8 C6H6ClFN2O
Ethanone, 1-(6-Methyl-2-pyridinyl)-2-[1,2,4]triazolo[1,5-a]pyridin-6-yl- Ethanone, 1-(6-Methyl-2-pyridinyl)-2-[1,2,4]triazolo[1,5-a]pyridin-6-yl- 614750-82-2 C14H12N4O
2-Chloro-5,6,7,8-tetrahydro-pyrido[3,4-d]pyriMidine 2-Chloro-5,6,7,8-tetrahydro-pyrido[3,4-d]pyriMidine 1196153-06-6 C7H8ClN3
5-(3-Methoxyphenyl)pyridin-2-aMine 5-(3-Methoxyphenyl)pyridin-2-aMine 893738-18-6 C12H12N2O
MK 212 HYDROCHLORIDE MK 212 HYDROCHLORIDE 64022-27-1 C8H11ClN4
2-broMo-5-cyclopropylthiazole 2-broMo-5-cyclopropylthiazole 1086381-69-2 C6H6BrNS
5-cyclobutylpyridin-3-ol 5-cyclobutylpyridin-3-ol 1314356-72-3 C9H11NO
(2S)-4-Oxo-2-(3-thiazolidinylcarbonyl)-1-pyrrolidinecarboxylic acid tert-butyl ester (2S)-4-Oxo-2-(3-thiazolidinylcarbonyl)-1-pyrrolidinecarboxylic acid tert-butyl ester 401564-36-1 C13H20N2O4S
4-BroMo-5-Methylpyridin-2-aMine 4-BroMo-5-Methylpyridin-2-aMine 1033203-32-5 C6H7BrN2
5-Chloro-4-(trifluoroMethyl)-2-pyridinecarboxylic acid 5-Chloro-4-(trifluoroMethyl)-2-pyridinecarboxylic acid 796090-31-8 C7H3ClF3NO2
2-(pyrrolidin-1-yl)pyridin-4-aMine 2-(pyrrolidin-1-yl)pyridin-4-aMine 35981-63-6 C9H13N3
FR901379 FR901379 144371-88-0 C51H82N8O21S
4-BROMO-2-CHLORO-5-(TRIFLUOROMETHYL)PYRIDINE 4-BROMO-2-CHLORO-5-(TRIFLUOROMETHYL)PYRIDINE 1211520-18-1 C6H2BrClF3N
6-(N-Boc-Piperazin-1-yl)pyridine-2-boronic acid pinacol ester 6-(N-Boc-Piperazin-1-yl)pyridine-2-boronic acid pinacol ester 1309982-26-0 C20H32BN3O4
2-broMo-3-((tetrahydrofuran-3-yl)oxy)pyridine 2-broMo-3-((tetrahydrofuran-3-yl)oxy)pyridine 1049023-88-2 C9H10BrNO2
3-(ChloroMethyl)-2-(trifluoroMethyl)pyridine 3-(ChloroMethyl)-2-(trifluoroMethyl)pyridine 1060814-58-5 C7H5ClF3N
4-chloro-5,8-dihydro-6H-pyrido[3,4-d]pyriMidine-7-carboxylic acid tert-butyl ester 4-chloro-5,8-dihydro-6H-pyrido[3,4-d]pyriMidine-7-carboxylic acid tert-butyl ester 1053656-57-7 C12H16ClN3O2
5-BroMo-2-pyrrolidinothiazole 5-BroMo-2-pyrrolidinothiazole 933696-74-3 C7H9BrN2S
2-BroMo-4-chloro-3-iodo-pyridine 2-BroMo-4-chloro-3-iodo-pyridine 1070870-41-5 C5H2BrClIN
2-[3-(Trifluoromethyl)phenyl]-3,4-dihydropyrimidin-4-one 2-[3-(Trifluoromethyl)phenyl]-3,4-dihydropyrimidin-4-one 125903-84-6 C11H7F3N2O
2,4-dibroMo-3-Methoxypyridine 2,4-dibroMo-3-Methoxypyridine 1256823-10-5 C6H5Br2NO
5-Amino-2-(trifluoromethyl)pyridin-4-ol, 4-Hydroxy-6-(trifluoromethyl)pyridin-3-amine 5-Amino-2-(trifluoromethyl)pyridin-4-ol, 4-Hydroxy-6-(trifluoromethyl)pyridin-3-amine 1196153-82-8 C6H5F3N2O
2,6-difluoro-3,5-diMethoxybenzenaMine 2,6-difluoro-3,5-diMethoxybenzenaMine 651734-54-2 C8H9F2NO2
7,7-diMethyl-1,4-dioxaspiro[4.5]decan-8-one 7,7-diMethyl-1,4-dioxaspiro[4.5]decan-8-one 134409-06-6 C10H16O3
CarbaMic acid, N,N-di-2-propyn-1-yl-, 1,1-diMethylethyl ester CarbaMic acid, N,N-di-2-propyn-1-yl-, 1,1-diMethylethyl ester 262418-92-8 C11H15NO2
5-broMo-2-(4-Methylpiperidin-1-yl)pyriMidine 5-broMo-2-(4-Methylpiperidin-1-yl)pyriMidine 1289089-91-3 C10H14BrN3
3-broMo-2-cyclopropylpyridine 3-broMo-2-cyclopropylpyridine 944718-27-8 C8H8BrN
6-(pyrrolidin-1-yl)pyridazin-3-aMine 6-(pyrrolidin-1-yl)pyridazin-3-aMine 66346-92-7 C8H12N4
3-CHLORO-2-(PYRROLIDIN-1-YL)-5-(4,4,5,5-TETRAMETHYL-1,3,2-DIOXABOROLAN-2-YL)PYRIDINE 3-CHLORO-2-(PYRROLIDIN-1-YL)-5-(4,4,5,5-TETRAMETHYL-1,3,2-DIOXABOROLAN-2-YL)PYRIDINE 3124585-49-2 C15H22BClN2O2
2,4-Dimethyl-5-(4,4,5,5-tetramethyl-[1,3,2]dioxaborolan-2-yl)-pyrimidine 2,4-Dimethyl-5-(4,4,5,5-tetramethyl-[1,3,2]dioxaborolan-2-yl)-pyrimidine 1951411-46-3 C12H19BN2O2
4-Bromo-2-(3-methyl-1H-pyrazol-1-yl)thiazole 4-Bromo-2-(3-methyl-1H-pyrazol-1-yl)thiazole 1159816-57-5 C7H6BrN3S
5-bromo-2-(difluoromethyl)-1,3-thiazole 5-bromo-2-(difluoromethyl)-1,3-thiazole 1319255-36-1 C4H2BrF2NS
8-chloro-2-(trifluoromethyl)-3,4-dihydro-1H-pyrimido[1,2-a]pyrimidin-6(2H)-one 8-chloro-2-(trifluoromethyl)-3,4-dihydro-1H-pyrimido[1,2-a]pyrimidin-6(2H)-one 1260585-12-3 C8H7ClF3N3O
5-Bromo-2-cyclopropyl-thiazole 5-Bromo-2-cyclopropyl-thiazole 1086382-42-4 C6H6BrNS
5-Chloro-6-trifluoromethyl-pyridin-2-ylamine 5-Chloro-6-trifluoromethyl-pyridin-2-ylamine 1227595-72-3 C6H4ClF3N2
2-(1H-1,2,3-TRIAZOL-4-YL)PYRIDINE AND 2-(2H-1,2,3-TRIAZOL-4-YL)PYRIDINE 2-(1H-1,2,3-TRIAZOL-4-YL)PYRIDINE AND 2-(2H-1,2,3-TRIAZOL-4-YL)PYRIDINE 88169-21-5 C7H6N4
1,4-Thioxane-1,1-dioxide 1,4-Thioxane-1,1-dioxide 107-61-9 C4H8O3S
2-bromo-4-(N-Methylpiperazin-1-yl)pyridine 2-bromo-4-(N-Methylpiperazin-1-yl)pyridine 1142194-82-8 C10H14BrN3
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