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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-Pyridazinecarboxylic acid, 6-chloro-,1-methylethyl ester 3-Pyridazinecarboxylic acid, 6-chloro-,1-methylethyl ester 321946-09-2 C8H9ClN2O2
6-Chloro-2,3-diphenylimidazo[1,2-b]pyridazine 6-Chloro-2,3-diphenylimidazo[1,2-b]pyridazine 873913-87-2 C18H12ClN3
4-Chloro-6,7-dihydro-5H-cyclopenta-pyridin-7-OL 4-Chloro-6,7-dihydro-5H-cyclopenta-pyridin-7-OL 126053-15-4 C8H8ClNO
1,5-dihydro-4H-pyrazolo[3,4-d]pyrimidin-4-one, monosodium salt 1,5-dihydro-4H-pyrazolo[3,4-d]pyrimidin-4-one, monosodium salt 17795-21-0 C5H5N4NaO
5-(4-FLUOROPHENYL)-2-PYRIDINAMINE 5-(4-FLUOROPHENYL)-2-PYRIDINAMINE 503536-73-0 C11H9FN2
3-FLUORO-4-(TRIFLUOROMETHYL)PYRIDINE 3-FLUORO-4-(TRIFLUOROMETHYL)PYRIDINE 113770-87-9 C6H3F4N
3-AMINO-1-ETHYL-6-HYDROXY-4-METHYL-2-PYRIDONE 3-AMINO-1-ETHYL-6-HYDROXY-4-METHYL-2-PYRIDONE 94492-81-6 C8H12N2O2
ETHYL 4-CHLORO-2-METHYLPYRIMIDINE-5-CARBOXYLATE ETHYL 4-CHLORO-2-METHYLPYRIMIDINE-5-CARBOXYLATE 2134-36-3 C8H9ClN2O2
6-methyl-pyridine-2-carboxylic acid ethyl ester 6-methyl-pyridine-2-carboxylic acid ethyl ester 39640-51-2 C9H11NO2
3-CHLORO-6-FLUOROBENZOTHIOPHENE-2-CARBONYL CHLORIDE 3-CHLORO-6-FLUOROBENZOTHIOPHENE-2-CARBONYL CHLORIDE 34576-83-5 C9H3Cl2FOS
METHYL 2-METHOXYISONICOTINATE 97%METHYL 2-METHOXYPYRIDINE-4-CARBOXYLATE METHYL 2-METHOXYISONICOTINATE 97%METHYL 2-METHOXYPYRIDINE-4-CARBOXYLATE 26156-51-4 C8H9NO3
4-CHLOROPYRIDIN-3-YLBORONIC ACID, PINACOL ESTER 98 4-CHLOROPYRIDIN-3-YLBORONIC ACID, PINACOL ESTER 98 452972-15-5 C11H15BClNO2
LAURYL DIMETHYLAMINE OXIDE LAURYL DIMETHYLAMINE OXIDE 70592-80-2 C10H13Br2N
2-AMINO-4-METHOXY-3-NITROPYRIDINE 2-AMINO-4-METHOXY-3-NITROPYRIDINE 84487-08-1 C6H7N3O3
3-METHYL-6-(1-METHYLHYDRAZINO)PYRIDAZINE 3-METHYL-6-(1-METHYLHYDRAZINO)PYRIDAZINE 175135-44-1 C6H10N4
2,2'-Bipyridine-4,4'-dicarboxaldehyde 2,2'-Bipyridine-4,4'-dicarboxaldehyde 99970-84-0 C12H8N2O2
6-Methyl-2-(methylthio)pyrimidin-4-ol 6-Methyl-2-(methylthio)pyrimidin-4-ol 6328-58-1 C6H8N2OS
2-METHYL-1,5-NAPHTHYRIDINE 2-METHYL-1,5-NAPHTHYRIDINE 7675-32-3 C9H8N2
N-Methyl-1-(pyridin-4-yl)methanamine N-Methyl-1-(pyridin-4-yl)methanamine 6971-44-4 C7H10N2
PIPERIDINE-4-CARBOXYLIC ACID (5-METHYL-PYRIDIN-2-YL)-AMIDE PIPERIDINE-4-CARBOXYLIC ACID (5-METHYL-PYRIDIN-2-YL)-AMIDE 110105-97-0 C12H17N3O
4-Phenylpyridine-N-oxide 4-Phenylpyridine-N-oxide 1131-61-9 C11H9NO
2-N-OCTYLTHIOPHENE 2-N-OCTYLTHIOPHENE 880-36-4 C12H20S
4-AMINO-5-CHLOROPYRIDAZIN-6-ON 4-AMINO-5-CHLOROPYRIDAZIN-6-ON 6339-19-1 C4H4ClN3O
4-(2-FURYL)-2-PYRIMIDINETHIOL 4-(2-FURYL)-2-PYRIMIDINETHIOL 190579-95-4 C8H6N2OS
TRANS-DECAHYDROISOQUINOLINE TRANS-DECAHYDROISOQUINOLINE 2744-09-4 C9H17N
1-PYRIDIN-4-YL-ETHANOL 1-PYRIDIN-4-YL-ETHANOL 23389-75-5 C7H9NO
2-CHLORO-5-N-DECYLPYRIMIDINE 2-CHLORO-5-N-DECYLPYRIMIDINE 170434-06-7 C14H23ClN2
8-METHYL-4-QUINAZOLONE 8-METHYL-4-QUINAZOLONE 19181-54-5 C9H8N2O
4-(HYDROXYMETHYL)PICOLINITRILE 4-(HYDROXYMETHYL)PICOLINITRILE 71935-32-5 C7H6N2O
4-HYDROXY-2-PHENYL-5-PYRIMIDINECARBOXYLIC ACID 4-HYDROXY-2-PHENYL-5-PYRIMIDINECARBOXYLIC ACID 56406-26-9 C11H8N2O3
Mivobulin Mivobulin 122332-18-7 C17H19N5O2
2-AMINO-4,6-DIHYDROXYPYRIDINE 2-AMINO-4,6-DIHYDROXYPYRIDINE C5H6N2O2
4-METHYL-6-PHENYLPYRIMIDIN-2-AMINE 4-METHYL-6-PHENYLPYRIMIDIN-2-AMINE 15755-15-4 C11H11N3
2-(4-Bromophenyl)imidazo[1,2-a]pyridine 2-(4-Bromophenyl)imidazo[1,2-a]pyridine 34658-66-7 C13H9BrN2
4-(6-CHLORO-2-METHYLPYRIMIDIN-4-YL)MORPHOLINE 4-(6-CHLORO-2-METHYLPYRIMIDIN-4-YL)MORPHOLINE 22177-99-7 C9H12ClN3O
5H-CYCLOPENTA[B]PYRIDIN-7-AMINE, 6,7-DIHYDRO- 5H-CYCLOPENTA[B]PYRIDIN-7-AMINE, 6,7-DIHYDRO- 185122-75-2 C8H10N2
5-(TERT-BUTYLSULFONYL)-2-(2-PYRIDYL)PYRIMIDIN-4-AMINE 5-(TERT-BUTYLSULFONYL)-2-(2-PYRIDYL)PYRIMIDIN-4-AMINE 175202-19-4 C13H16N4O2S
6-TERT-BUTYL-3H-THIENO[2,3-D]PYRIMIDIN-4-ONE 6-TERT-BUTYL-3H-THIENO[2,3-D]PYRIMIDIN-4-ONE 439692-54-3 C10H12N2OS
2-CHLORO-4-THIOCYANATOPYRIMIDINE 2-CHLORO-4-THIOCYANATOPYRIMIDINE 854476-92-9 C5H2ClN3S
6-CHLORO-N-ETHYL-2-(METHYLSULFANYL)-4-PYRIMIDINAMINE 6-CHLORO-N-ETHYL-2-(METHYLSULFANYL)-4-PYRIMIDINAMINE 339017-83-3 C7H10ClN3S
2-(2,2,2-TRIFLUOROETHOXY)PYRIDINE-3-CARBONITRILE 2-(2,2,2-TRIFLUOROETHOXY)PYRIDINE-3-CARBONITRILE 175277-89-1 C8H5F3N2O
3-N-NONYLTHIOPHENE 3-N-NONYLTHIOPHENE 65016-63-9 C13H22S
3-CYANOCHROMONE 3-CYANOCHROMONE 50743-17-4 C10H5NO2
2-AMINO-3-FORMYLCHROMONE 2-AMINO-3-FORMYLCHROMONE 61424-76-8 C10H7NO3
4'-(4-METHYLPHENYL)-2,2':6',2''-TERPYRIDINE 4'-(4-METHYLPHENYL)-2,2':6',2''-TERPYRIDINE 89972-77-0 C22H17N3
2-AMINO-4-TRIFLUOROMETHYL-PYRIMIDINE-5-CARBOXYLIC ACID 2-AMINO-4-TRIFLUOROMETHYL-PYRIMIDINE-5-CARBOXYLIC ACID C6H4F3N3O2
3-NITRO-6-PYRIDINEMETHANOL 3-NITRO-6-PYRIDINEMETHANOL 36625-57-7 C6H6N2O3
6-NITRONICOTINIC ACID 6-NITRONICOTINIC ACID 33225-73-9 C6H4N2O4
2-METHOXY-6-METHYLPYRIDINE-3-BORONIC ACID 2-METHOXY-6-METHYLPYRIDINE-3-BORONIC ACID 1000802-75-4 C7H10BNO3
3-THIOPHENECARBOXYLIC ACID N-BUTYL ESTER 3-THIOPHENECARBOXYLIC ACID N-BUTYL ESTER 317385-62-9 C9H12O2S
Benzyl 1-homopiperazine carboxylate Benzyl 1-homopiperazine carboxylate 117009-97-9 C13H18N2O2
2-AMINO-4-METHYLNICOTINIC ACID, 2-AMINO-4-METHYLNICOTINIC ACID, 38076-82-3 C7H8N2O2
3-BROMO-2-FLUORO-5-CHLOROPYRIDINE 3-BROMO-2-FLUORO-5-CHLOROPYRIDINE C5H2BrClFN
ETHYL 2-HYDROXYPYRIMIDINE-5-CARBOXYLATE ETHYL 2-HYDROXYPYRIMIDINE-5-CARBOXYLATE C7H8N2O3
4-pyridinylmethylguanidine 4-pyridinylmethylguanidine 45957-41-3 C7H10N4
7H-PYRAZOLO[4,3-D]PYRIMIDIN-7-ONE, 1,4-DIHYDRO- 7H-PYRAZOLO[4,3-D]PYRIMIDIN-7-ONE, 1,4-DIHYDRO- 13877-55-9 C5H4N4O
6-ethoxynicotinic acid 6-ethoxynicotinic acid 97455-65-7 C8H9NO3
4-chloro-2-(trifluoromethyl)thieno[3,2-d]pyrimidine 4-chloro-2-(trifluoromethyl)thieno[3,2-d]pyrimidine 147972-27-8 C7H2ClF3N2S
7-bromo-4-chloropyrido[3,2-d]pyrimidine 7-bromo-4-chloropyrido[3,2-d]pyrimidine 573675-31-7 C7H3BrClN3
MK 0974, Telcagepant MK 0974, Telcagepant 781649-09-0 C26H27F5N6O3
isoquinolin-3-ylmethanol isoquinolin-3-ylmethanol 76884-34-9 C10H9NO
2-Chloropyridine-4-carboxylic acid tert-butyl ester 2-Chloropyridine-4-carboxylic acid tert-butyl ester 295349-62-1 C10H12ClNO2
2,4-DIAMINO-6-MERCAPTO-PYRIMIDINE SULFATE 2,4-DIAMINO-6-MERCAPTO-PYRIMIDINE SULFATE 307496-37-3 C4H8N4O4S2
4-BROMOMETHYL-6,7-DIMETHOXYCOUMARIN 4-BROMOMETHYL-6,7-DIMETHOXYCOUMARIN 88404-25-5 C12H11BrO4
2,5-THIOPHENEDIBORONIC ACID 2,5-THIOPHENEDIBORONIC ACID 26076-46-0 C4H6B2O4S
1-PYRIDIN-2-YLMETHYLPIPERIDINE-4-CARBOXYLIC ACID ETHYL ESTER 1-PYRIDIN-2-YLMETHYLPIPERIDINE-4-CARBOXYLIC ACID ETHYL ESTER 138030-53-2 C14H20N2O2
Methyl  6-fluoropicolinate Methyl 6-fluoropicolinate 455-71-0 C7H6FNO2
6-chloro-3-iodopyridin-2-amine 6-chloro-3-iodopyridin-2-amine 800402-06-6 C5H4ClIN2
4-Hydroxy-2-(methylthio)pyrimidine-5-carbonitrile 4-Hydroxy-2-(methylthio)pyrimidine-5-carbonitrile 89487-99-0 C6H5N3OS
2-BroMo-5-Methyl-4-nitropyridine 1-oxide 2-BroMo-5-Methyl-4-nitropyridine 1-oxide 60323-98-0 C6H5BrN2O3
PYRAZOLO[1,5-A]PYRIMIDINE-3-CARBALDEHYDE PYRAZOLO[1,5-A]PYRIMIDINE-3-CARBALDEHYDE 879072-59-0 C7H5N3O
3-METHOXYCARBONYL-5-NITRO-2(1H)-PYRIDINONE 3-METHOXYCARBONYL-5-NITRO-2(1H)-PYRIDINONE 856579-28-7 C7H6N2O5
2-AMINO-6-FLUORO-4-HYDRAZINOPYRIMIDINE 2-AMINO-6-FLUORO-4-HYDRAZINOPYRIMIDINE 188987-85-1 C4H6FN5
4-(METHYLAMINO)-3-NITROPYRIDINE 4-(METHYLAMINO)-3-NITROPYRIDINE 1633-41-6 C6H7N3O2
1-BROMO-2-METHOXY-3-NITRO-BENZENE 1-BROMO-2-METHOXY-3-NITRO-BENZENE 31872-76-1 C6H5BrN2O3
4-CHLOROFURO[3,2-D]PYRIMIDINE 4-CHLOROFURO[3,2-D]PYRIMIDINE 655255-09-7 C6H3ClN2O
5-BROMO-2,4-DIMETHYLPYRIDINE 5-BROMO-2,4-DIMETHYLPYRIDINE 27063-92-9 C7H8BrN
4-AMINO-5-BROMO-6-CHLOROPYRIMIDINE 4-AMINO-5-BROMO-6-CHLOROPYRIMIDINE 663193-80-4 C4H3BrClN3
3-CHLOROPYRIDAZINE-4-CARBONITRILE 3-CHLOROPYRIDAZINE-4-CARBONITRILE 1445-56-3 C5H2ClN3
4-Bromo-2-pyridinecarboxamide 4-Bromo-2-pyridinecarboxamide 62150-46-3 C6H5BrN2O
Pyridine, 2,4-dichloro-5-iodo- Pyridine, 2,4-dichloro-5-iodo- 343781-49-7 C5H2Cl2IN
4-CHLORO-6-METHYLNICOTINONITRILE 4-CHLORO-6-METHYLNICOTINONITRILE 38875-76-2 C7H5ClN2
2-CHLORO-5-FLUORO-4-IODOPYRIDINE 2-CHLORO-5-FLUORO-4-IODOPYRIDINE C5H2ClFIN
4-AMINO-2-BROMO-3-NITROPYRIDINE 4-AMINO-2-BROMO-3-NITROPYRIDINE 84487-14-9 C5H4BrN3O2
2(3H)-PYRIDINONE, 3-CHLORO-5-(TRIFLUOROMETHYL)- 2(3H)-PYRIDINONE, 3-CHLORO-5-(TRIFLUOROMETHYL)- 79623-37-3 C6H3ClF3NO
2-Bromo-6-methoxypyrimidine 2-Bromo-6-methoxypyrimidine 944709-74-4 C5H5BrN2O
ethyl 4-amino-2-chloropyrimidine-5-carboxylate,4-amino-2-chloro-pyrimidine-5-carboxylic acid ethyl ester ethyl 4-amino-2-chloropyrimidine-5-carboxylate,4-amino-2-chloro-pyrimidine-5-carboxylic acid ethyl ester 71406-78-5 C7H8ClN3O2
4-Chloro-7H-pyrrolo[2,3-d]pyrimidine-5-carbaldehyde 4-Chloro-7H-pyrrolo[2,3-d]pyrimidine-5-carbaldehyde 908287-21-8 C7H4ClN3O
4-(Trifluoromethyl)pyrimidine-5-carboxylic acid 4-(Trifluoromethyl)pyrimidine-5-carboxylic acid 220880-12-6 C6H3F3N2O2
2-Chloro-4-ethoxy-6-methyl-pyrimidine 2-Chloro-4-ethoxy-6-methyl-pyrimidine 37482-64-7 C7H9ClN2O
5-pyrimidineethanol 5-pyrimidineethanol 875251-47-1 C6H8N2O
2-Amino-4-hydroxypyridine hydrochloride 2-Amino-4-hydroxypyridine hydrochloride 1187932-09-7 C5H6N2O.HCl
6-Chlorooxazolo[4,5-b]pyridin-2(3H)-one 6-Chlorooxazolo[4,5-b]pyridin-2(3H)-one 35570-68-4 C6H3ClN2O2
2-Amino-3-hydroxy-5-chloropyridine 2-Amino-3-hydroxy-5-chloropyridine 40966-87-8 C5H5ClN2O
2-Amino-4,6-dichloro-nicotinicacidmethylester 2-Amino-4,6-dichloro-nicotinicacidmethylester 1044872-40-3 C7H6Cl2N2O2
MK-1775 MK-1775 955365-80-7 C27H32N8O2
2,5-Dichloronicotinonitrile 2,5-Dichloronicotinonitrile 126954-66-3 C6H2Cl2N2
N-(4-Methoxybenzyl)-4-nitropyridin-2-aMine N-(4-Methoxybenzyl)-4-nitropyridin-2-aMine 942076-74-6 C13H13N3O3
2-broMo-5-fluoropyridine-3,4-diaMine 2-broMo-5-fluoropyridine-3,4-diaMine 1227958-29-3 C5H5BrFN3
1-METHYL-4-PHENYL-1,2,3,6-TETRAHYDROPYRIDINE 1-METHYL-4-PHENYL-1,2,3,6-TETRAHYDROPYRIDINE 28289-54-5 C12H15N
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