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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
3,4-Diamino-2-bromopyridine 3,4-Diamino-2-bromopyridine 189230-41-9 C5H6BrN3
2,3-Diamino-4,5-dichloropyridine 2,3-Diamino-4,5-dichloropyridine 662116-66-7 C5H5Cl2N3
2-Amino-4-methylpyridin-3-ol 2-Amino-4-methylpyridin-3-ol 20348-18-9 C6H8N2O
2,4-Dichloro-5-methoxymethyl-pyrimidine 2,4-Dichloro-5-methoxymethyl-pyrimidine 89380-14-3 C6H6Cl2N2O
(4-Chloro-6-methyl-pyrimidin-2-yl)-ethyl-amine (4-Chloro-6-methyl-pyrimidin-2-yl)-ethyl-amine 5748-33-4 C7H10ClN3
(5-Fluoro-pyrimidin-2-yl)-isopropyl-amine (5-Fluoro-pyrimidin-2-yl)-isopropyl-amine 77476-97-2 C7H10FN3
3-bromo-2,4-dichloropyridine 3-bromo-2,4-dichloropyridine 144584-32-7 C5H2BrCl2N
(5-chloro-3-fluoropyridin-2-yl)MethanaMine hydrochloride (5-chloro-3-fluoropyridin-2-yl)MethanaMine hydrochloride 1257535-29-7 C6H7Cl2FN2
4-Amino-6-chloro-5-fluoropyrimidine 4-Amino-6-chloro-5-fluoropyrimidine 851984-15-1 C4H3ClFN3
IMidazo[1,2-a]pyridine-3-carboxylic acid, 6-chloro- IMidazo[1,2-a]pyridine-3-carboxylic acid, 6-chloro- 138642-97-4 C8H5ClN2O2
4-broMo-2-(trifluoroMethyl)pyriMidine 4-broMo-2-(trifluoroMethyl)pyriMidine 1034827-56-9 C5H2BrF3N2
3-METHOXYPYRIDINE 1-OXIDE 3-METHOXYPYRIDINE 1-OXIDE 14906-61-7 C6H7NO2
4-HYDROXY-2-PHENYLPYRIMIDINE 4-HYDROXY-2-PHENYLPYRIMIDINE 33643-94-6 C10H8N2O
4-NITROPYRIDINE-3-SULFONIC ACID 4-NITROPYRIDINE-3-SULFONIC ACID 33263-46-6 C5H4N2O5S
3,5-DIMETHYLURACIL 3,5-DIMETHYLURACIL 4160-77-4 C6H8N2O2
7-AMINO-4-(METHOXYMETHYL)COUMARIN 7-AMINO-4-(METHOXYMETHYL)COUMARIN 175205-10-4 C11H11NO3
3-BROMO-2-PHENYL-IMIDAZO[1,2-A]PYRIMIDINE 3-BROMO-2-PHENYL-IMIDAZO[1,2-A]PYRIMIDINE 904814-72-8 C12H8BrN3
4-CHLORO-N,6-DIMETHYLPYRIMIDIN-2-AMINE 4-CHLORO-N,6-DIMETHYLPYRIMIDIN-2-AMINE 5738-15-8 C6H8ClN3
3-ACETYL-7-HYDROXY-2H-CHROMEN-2-ONE 3-ACETYL-7-HYDROXY-2H-CHROMEN-2-ONE 10441-27-7 C11H8O4
2-(CHLOROACETYL)THIOPHENE 2-(CHLOROACETYL)THIOPHENE 29683-77-0 C6H5ClOS
2-BROMONICOTINAMIDE 2-BROMONICOTINAMIDE 87674-18-8 C6H5BrN2O
THIOPHENE-2-CARBOXYLIC ANHYDRIDE THIOPHENE-2-CARBOXYLIC ANHYDRIDE 25569-97-5 C10H6O3S2
METHYL-2-ISOTHIOCYANATOTHIOPHENE-3-CARBOXYLATE METHYL-2-ISOTHIOCYANATOTHIOPHENE-3-CARBOXYLATE 126637-07-8 C7H5NO2S2
4-BOC-1-(5-BROMO-2-PYRIDYL)PIPERAZINE 4-BOC-1-(5-BROMO-2-PYRIDYL)PIPERAZINE 153747-97-8 C14H20BrN3O2
2 6-DIMETHOXYPYRIDINE-3-CARBOXALDEHYDE& 2 6-DIMETHOXYPYRIDINE-3-CARBOXALDEHYDE& 58819-72-0 C8H9NO3
6-(2-HYDROXYPHENYL)-PYRIDAZIN-3(2H)-ONE 6-(2-HYDROXYPHENYL)-PYRIDAZIN-3(2H)-ONE 62567-42-4 C10H8N2O2
PYRIDINE-4-BORONIC ACID HYDROCHLORIDE PYRIDINE-4-BORONIC ACID HYDROCHLORIDE 913835-65-1 C5H7BClNO2
5-METHOXY-2-NITROPYRIDINE 5-METHOXY-2-NITROPYRIDINE 126739-64-8 C6H6N2O3
4-(DIMETHYLAMINO)-2,3,5,6-TETRAFLUOROPYRIDINE 4-(DIMETHYLAMINO)-2,3,5,6-TETRAFLUOROPYRIDINE 2875-13-0 C7H6F4N2
Acefylline piperazinate Acefylline piperazinate 18833-13-1 C13H20N6O4
3,4-DIHYDROISOQUINOLINE 3,4-DIHYDROISOQUINOLINE 3230-65-7 C9H9N
2,6-DIBROMO-3,5-DIFLUOROISONICOTINIC ACID 2,6-DIBROMO-3,5-DIFLUOROISONICOTINIC ACID 325461-60-7 C6HBr2F2NO2
ETHYL 2-HYDROXYPYRIMIDINE-4-CARBOXYLATE ETHYL 2-HYDROXYPYRIMIDINE-4-CARBOXYLATE 306961-02-4 C7H8N2O3
3-FORMYL-2-PYRIDINECARBONITRILE 3-FORMYL-2-PYRIDINECARBONITRILE 131747-66-5 C7H4N2O
4,4'-DIPYRIDYL DIHYDROCHLORIDE 4,4'-DIPYRIDYL DIHYDROCHLORIDE 27926-72-3 C10H10Cl2N2
2-METHYL-IMIDAZO[1,2-A]PYRIMIDINE-3-CARBALDEHYDE 2-METHYL-IMIDAZO[1,2-A]PYRIMIDINE-3-CARBALDEHYDE C8H7N3O
N-HEXYLPYRIDINIUM BROMIDE N-HEXYLPYRIDINIUM BROMIDE 74440-81-6 C11H18BrN
SULFADIMETHOXINE-D4 SULFADIMETHOXINE-D4 1020719-80-5 C12H14N4O4S
(3-PYRIMIDIN-5-YLPHENYL)METHANOL (3-PYRIMIDIN-5-YLPHENYL)METHANOL 852180-75-7 C11H10N2O
5-(DIETHYLAMINO)URACIL 5-(DIETHYLAMINO)URACIL 55476-36-3 C8H13N3O2
7,8-DIHYDROXY-4-METHYLCOUMARIN 7,8-DIHYDROXY-4-METHYLCOUMARIN 2107-77-9 C10H8O4
2-METHANESULFONYL-4-PHENYL-PYRIMIDINE 2-METHANESULFONYL-4-PHENYL-PYRIMIDINE 56734-11-3 C11H10N2O2S
2-MERCAPTO-4-METHYLNICOTINONITRILE 2-MERCAPTO-4-METHYLNICOTINONITRILE C7H6N2S
ACETIC ACID 2-CYANO-PYRIDIN-3-YLMETHYL ESTER ACETIC ACID 2-CYANO-PYRIDIN-3-YLMETHYL ESTER 131747-36-9 C9H8N2O2
4-Chloro-pyridine-2-carbonyl chloride 4-Chloro-pyridine-2-carbonyl chloride 53750-66-6 C6H3Cl2NO
p-[2-(3,4-dihydro-7-methoxy-4,4-dimethyl-1,3-dioxo-2(1H)-isoquinolyl)ethyl]benzenesulphonamide p-[2-(3,4-dihydro-7-methoxy-4,4-dimethyl-1,3-dioxo-2(1H)-isoquinolyl)ethyl]benzenesulphonamide 33456-68-7 C20H22N2O5S
4,6-dimethylpyrimidin-2-ol--1,2,3,4-tetrahydro-2-methyl-1,4-dioxonaphthalene-2-sulphonic acid (1:1) 4,6-dimethylpyrimidin-2-ol--1,2,3,4-tetrahydro-2-methyl-1,4-dioxonaphthalene-2-sulphonic acid (1:1) 14451-99-1 C17H18N2O6S
4,6-dihydoxy-2-aminopyrimidine 4,6-dihydoxy-2-aminopyrimidine C4H5N3O2
3-Pyrimidin-2-ylbenzyl chloride 3-Pyrimidin-2-ylbenzyl chloride 898289-51-5 C11H9ClN2
2,4-Diamino-6-hydroxy-5-nitropyrimidine 2,4-Diamino-6-hydroxy-5-nitropyrimidine 3346-23-4 C4H5N5O3
2-Cyano-3,6-dimethylpyridine 2-Cyano-3,6-dimethylpyridine 68164-77-2 C8H8N2
4-Amino-3-bromo-2-hydroxypyridine 4-Amino-3-bromo-2-hydroxypyridine 107842-74-0 C5H5BrN2O
4-Fluoroisoquinoline 4-Fluoroisoquinoline 394-67-2 C9H6FN
2-Pyrimidinecarbonitrile, 4-methyl- (9CI) 2-Pyrimidinecarbonitrile, 4-methyl- (9CI) 77768-02-6 C6H5N3
Boronic acid, [2-(dimethylamino)-5-pyrimidinyl]- (9CI) Boronic acid, [2-(dimethylamino)-5-pyrimidinyl]- (9CI) 756817-82-0 C6H10BN3O2
Pyrimidine, 2-chloro-4-fluoro- (9CI) Pyrimidine, 2-chloro-4-fluoro- (9CI) 38953-29-6 C4H2ClFN2
4-Pyrimidinecarboxaldehyde, 2-(methylamino)- (9CI) 4-Pyrimidinecarboxaldehyde, 2-(methylamino)- (9CI) 180869-39-0 C6H7N3O
5-Pyrimidinol, 4,6-diamino- (9CI) 5-Pyrimidinol, 4,6-diamino- (9CI) 54016-37-4 C4H6N4O
1H-Pyrrolo[2,3-b]pyridine, 3-methyl-, 7-oxide (9CI) 1H-Pyrrolo[2,3-b]pyridine, 3-methyl-, 7-oxide (9CI) 688782-00-5 C8H8N2O
6-CHLORO-4-(TRIFLUOROMETHYL)NICOTINICACID
6-CHLORO-4-(TRIFLUOROMETHYL)NICOTINICACID 261635-77-2 C7H3ClF3NO2
6-Methoxybenzo(b)thiophene 6-Methoxybenzo(b)thiophene 90560-10-4 C9H8OS
1-(4-Fluoro-phenyl)-1H-pyrazole-4-carbaldehyde 1-(4-Fluoro-phenyl)-1H-pyrazole-4-carbaldehyde 890652-03-6 C10H7FN2O
8-acetylquinoline 8-acetylquinoline 56234-20-9 C11H9NO
3-Bromo-5-(methylsulphonyl)pyridine 3-Bromo-5-(methylsulphonyl)pyridine 445491-71-4 C6H6BrNO2S
2-Pyridinecarboxamide,5-fluoro-(9CI) 2-Pyridinecarboxamide,5-fluoro-(9CI) 499796-71-3 C6H5FN2O
2-Pyrimidinamine,4,5-dichloro-(9CI) 2-Pyrimidinamine,4,5-dichloro-(9CI) 403854-21-7 C4H3Cl2N3
5-Fluoro-4-hydrazinyl-2-methoxypyrimidine 5-Fluoro-4-hydrazinyl-2-methoxypyrimidine 166524-64-7 C5H7FN4O
7-Isoquinolinecarbonitrile(9CI) 7-Isoquinolinecarbonitrile(9CI) 223671-92-9 C10H6N2
2(1H)-Pyridinone,6-(aminomethyl)-(9CI) 2(1H)-Pyridinone,6-(aminomethyl)-(9CI) 131052-62-5 C6H8N2O
2-Pyridinamine,3,6-dichloro-(9CI) 2-Pyridinamine,3,6-dichloro-(9CI) 313535-01-2 C5H4Cl2N2
2-(2-PYRIDINYL)-4-(TRIFLUOROMETHYL)-5-PYRIMIDINECARBOXYLIC ACID 2-(2-PYRIDINYL)-4-(TRIFLUOROMETHYL)-5-PYRIMIDINECARBOXYLIC ACID C11H6F3N3O2
4,6-DIMETHYLNICOTINIC ACID 4,6-DIMETHYLNICOTINIC ACID 22047-86-5 C8H9NO2
1-(4-Fluorophenyl)-2-oxo-1,2-dihydropyridine-3-carbonitrile 1-(4-Fluorophenyl)-2-oxo-1,2-dihydropyridine-3-carbonitrile 929000-74-8 C12H7FN2O
5-Bromo-4-(2,5-dimethylphenyl)pyrimidine 5-Bromo-4-(2,5-dimethylphenyl)pyrimidine 941294-35-5 C12H11BrN2
Ethyl 8-bromo-6-methylimidazo[1,2-a]pyridine-2-carboxylate Ethyl 8-bromo-6-methylimidazo[1,2-a]pyridine-2-carboxylate 847446-55-3 C11H11BrN2O2
4-Hydroxy-4-(6-methoxypyridin-3-yl)cyclohexanone 4-Hydroxy-4-(6-methoxypyridin-3-yl)cyclohexanone 708273-57-8 C12H15NO3
4-Amino-6-bromo-2-(trifluoromethyl)quinoline-3-carbonitrile 4-Amino-6-bromo-2-(trifluoromethyl)quinoline-3-carbonitrile 1209063-53-5 C11H5BrF3N3
2-HYDROXYPYRIMIDINE-5-BORONIC ACID, PINACOL ESTER 2-HYDROXYPYRIMIDINE-5-BORONIC ACID, PINACOL ESTER 1073354-84-3 C10H15BN2O3
5-Amino-3-pyridinecarboxylic acid ethyl ester 5-Amino-3-pyridinecarboxylic acid ethyl ester 17285-76-6 C8H10N2O2
PYRIDO[3,4-B]PYRAZINE, 7-CHLORO- PYRIDO[3,4-B]PYRAZINE, 7-CHLORO- 93049-39-9 C7H4ClN3
1-INDAN-1-YL-PIPERAZINE 1-INDAN-1-YL-PIPERAZINE 185678-56-2 C13H18N2
2-(5-bromopyridin-2-yl)ethanol 2-(5-bromopyridin-2-yl)ethanol 1206968-77-5 C7H8BrNO
2,4,5,6-Tetrafluoropyrimidine 2,4,5,6-Tetrafluoropyrimidine 767-79-3 C4F4N2
3-Azido-2-chloropyridine 3-Azido-2-chloropyridine 102934-51-0 C5H3ClN4
5-bromo-2-methylsulfanyl-3H-pyrimidin-4-one 5-bromo-2-methylsulfanyl-3H-pyrimidin-4-one 81560-03-4 C5H5BrN2OS
4-chloro-7-fluoro-pyrido[4,3-d]pyrimidine 4-chloro-7-fluoro-pyrido[4,3-d]pyrimidine 175357-95-6 C7H3ClFN3
2,3-Dibromo-5-pyridinecarboxaldehyde 2,3-Dibromo-5-pyridinecarboxaldehyde 1092349-81-9 C6H3Br2NO
PD 166285 PD 166285 212391-63-4 C26H29Cl4N5O2
2,6-Difluoro-3-cyanopyridine 2,6-Difluoro-3-cyanopyridine 869557-17-5 C6H2F2N2
THIOPHENE-2-SULFONYLACETONITRILE THIOPHENE-2-SULFONYLACETONITRILE 175137-62-9 C6H5NO2S2
2-Pyridinecarboxylic  acid,4-(acetylamino)- 2-Pyridinecarboxylic acid,4-(acetylamino)- 84487-16-1 C8H8N2O3
2,6-Difluoro-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridine 2,6-Difluoro-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridine 1204333-58-3 C11H14BF2NO2
4-Chloro-2-(methylthio)pyrimidine-5-carboxaldehyde 4-Chloro-2-(methylthio)pyrimidine-5-carboxaldehyde 148256-82-0 C6H5ClN2OS
2,6-dichloro-pyrimidin-4-ol 2,6-dichloro-pyrimidin-4-ol 120977-94-8 C4H2Cl2N2O
methyl 4-bromo-6-chloropicolinate methyl 4-bromo-6-chloropicolinate 1206249-86-6 C7H5BrClNO2
4-bromo-2-methoxy-3-methyl- Suppliers 4-bromo-2-methoxy-3-methyl- Suppliers 112197-12-3 C7H8BrNO
2-MethylpyriMidine-5-boronic Acid Pinacol Ester 2-MethylpyriMidine-5-boronic Acid Pinacol Ester 1052686-67-5 C11H17BN2O2
DiMethyl 2-(Methylthio)pyriMidine-4,5-dicarboxylate DiMethyl 2-(Methylthio)pyriMidine-4,5-dicarboxylate 132973-51-4 C9H10N2O4S
2-(2-BroMophenyl)pyridine 2-(2-BroMophenyl)pyridine 109306-86-7 C11H8BrN
3-AMino-5-hydroxypyridine Dihydrochloride 3-AMino-5-hydroxypyridine Dihydrochloride 1186663-39-7 C5H7ClN2O
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