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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
4-(4-METHOXYPHENYL)-6-(TRIFLUOROMETHYL)PYRIMIDIN-2-AMINE 4-(4-METHOXYPHENYL)-6-(TRIFLUOROMETHYL)PYRIMIDIN-2-AMINE 519056-51-0 C12H10F3N3O
4-METHOXYPYRIDINE-2-CARBONITRILE 4-METHOXYPYRIDINE-2-CARBONITRILE 36057-44-0 C7H6N2O
3-BROMO-2-FLUORO-4-IODOPYRIDINE 3-BROMO-2-FLUORO-4-IODOPYRIDINE 884494-52-4 C5H2BrFIN
4-BROMO-TETRAHYDROPYRAN 4-BROMO-TETRAHYDROPYRAN 25637-16-5 C5H9BrO
5-bromo-2-methoxy-3-(trifluoromethyl)pyridine 5-bromo-2-methoxy-3-(trifluoromethyl)pyridine 1214377-42-0 C7H5BrF3NO
2-CHLORO-5H-PYRROLO[3,2-D]PYRIMIDINE 2-CHLORO-5H-PYRROLO[3,2-D]PYRIMIDINE 1119280-66-8 C6H4ClN3
5-CHLORO-3-CYANOPYRIDINE 5-CHLORO-3-CYANOPYRIDINE 51269-82-0 C6H3ClN2
thiophen-3-amine oxalate thiophen-3-amine oxalate 861965-63-1 C6H7NO4S
2,6-Dibromopyrazine 2,6-Dibromopyrazine 23229-25-6 C4H2Br2N2
2-(5-bromopyridin-2-yl)acetic acid 2-(5-bromopyridin-2-yl)acetic acid 192642-85-6 C7H6BrNO2
2-Pyridinethiol 1-oxide 2-Pyridinethiol 1-oxide 1121-31-9 C5H5NOS
PYRIDINE, 2-CHLORO-4-HYDRAZINO- PYRIDINE, 2-CHLORO-4-HYDRAZINO- 700811-29-6 C5H6ClN3
4-Phenyl-1,2,3,6-tetrahydropyridine hydrochloride 4-Phenyl-1,2,3,6-tetrahydropyridine hydrochloride 43064-12-6 C11H14ClN
2,3-DICHLORO-5-FORMYLPYRIDINE 2,3-DICHLORO-5-FORMYLPYRIDINE 71690-05-6 C6H3Cl2NO
4-AMINO-3,5-DIBROMO-2-METHYLPYRIDINE 4-AMINO-3,5-DIBROMO-2-METHYLPYRIDINE 126325-54-0 C6H6Br2N2
(6-AMINO-3-PYRIDINYL)METHANOL (6-AMINO-3-PYRIDINYL)METHANOL 113293-71-3 C6H8N2O
5-CYANO-3-PYRIDINECARBOXYLIC ACID METHYL ESTER 5-CYANO-3-PYRIDINECARBOXYLIC ACID METHYL ESTER 106726-82-3 C8H6N2O2
2-chloro-6,7-dihydro-5H-pyrrolo[3,4-b]pyridine 2-chloro-6,7-dihydro-5H-pyrrolo[3,4-b]pyridine 810668-57-6 C7H7ClN2
(4-CHLORO-BENZYL)-PYRIDIN-3-YLMETHYL-AMINE (4-CHLORO-BENZYL)-PYRIDIN-3-YLMETHYL-AMINE 212392-65-9 C13H13ClN2
3-Methoxy-5-nitropyridin-2-ol 3-Methoxy-5-nitropyridin-2-ol 75710-99-5 C6H6N2O4
6-BROMO-2,2'-BIPYRIDINE 6-BROMO-2,2'-BIPYRIDINE 10495-73-5 C10H7BrN2
2,5-DICHLORO-3-(4,4,5,5-TETRAMETHYL-[1,3,2]-DIOXABOROLAN-2-YL)PYRIDINE 2,5-DICHLORO-3-(4,4,5,5-TETRAMETHYL-[1,3,2]-DIOXABOROLAN-2-YL)PYRIDINE 1073371-98-8 C11H14BCl2NO2
2H-Pyrido[3,2-b][1,4]oxazin-3(4H)-one 2H-Pyrido[3,2-b][1,4]oxazin-3(4H)-one 20348-09-8 C7H6N2O2
5,7-Dibromo-2,3-dihydrothieno[3,4-b][1,4]dioxine 5,7-Dibromo-2,3-dihydrothieno[3,4-b][1,4]dioxine 174508-31-7 C6H4Br2O2S
2-(Chloromethyl)thiophene 2-(Chloromethyl)thiophene 765-50-4 C5H5ClS
5-BROMOPYRAZINE-2-CARBONITRILE 5-BROMOPYRAZINE-2-CARBONITRILE 221295-04-1 C5H2BrN3
4H-PYRIDO[1,2-A]PYRIMIDIN-4-ONE, 7-METHYL-2-(4-MORPHOLINYL)-9-[1-(PHENYLAMINO)ETHYL]- 4H-PYRIDO[1,2-A]PYRIMIDIN-4-ONE, 7-METHYL-2-(4-MORPHOLINYL)-9-[1-(PHENYLAMINO)ETHYL]- 663619-89-4 C21H24N4O2
5-BROMO-4,6-DIMETHYL-2-OXO-1,2-DIHYDRO-3-PYRIDINECARBONITRILE 5-BROMO-4,6-DIMETHYL-2-OXO-1,2-DIHYDRO-3-PYRIDINECARBONITRILE 23819-87-6 C8H7BrN2O
3,4-DIFLUOROPYRIDINE 3,4-DIFLUOROPYRIDINE 82878-63-5 C5H3F2N
5-(4-CHLOROPHENYL)PYRIMIDIN-4-AMINE 5-(4-CHLOROPHENYL)PYRIMIDIN-4-AMINE 35202-25-6 C10H8ClN3
6-(DIMETHYLAMINO)NICOTINONITRILE 6-(DIMETHYLAMINO)NICOTINONITRILE 154924-17-1 C8H9N3
3-AMINO-2-(METHYLAMINO)-5-(TRIFLUOROMETHYL)PYRIDINE 3-AMINO-2-(METHYLAMINO)-5-(TRIFLUOROMETHYL)PYRIDINE 172648-55-4 C7H8F3N3
2-DIPHENYLPHOSPHINO-6-METHYLPYRIDINE 2-DIPHENYLPHOSPHINO-6-METHYLPYRIDINE 132682-77-0 C18H16NP
PYRIDINE-2-SULFONIC ACID PYRIDINE-2-SULFONIC ACID 15103-48-7 C5H5NO3S
3-CHLORO-6-(4-METHYLPHENYL)-PYRIDAZINE 3-CHLORO-6-(4-METHYLPHENYL)-PYRIDAZINE 2165-06-2 C11H9ClN2
2,5-DICHLOROPYRIDINE-3-CARBONYL CHLORIDE 2,5-DICHLOROPYRIDINE-3-CARBONYL CHLORIDE 78686-87-0 C6H2Cl3NO
2,3-DICHLOROPYRIDINE-4-BORONIC ACID 2,3-DICHLOROPYRIDINE-4-BORONIC ACID C5H4BCl2NO2
3-CHLORO-2-(4-MORPHOLINO)PYRIDINE 3-CHLORO-2-(4-MORPHOLINO)PYRIDINE 54231-36-6 C9H11ClN2O
2-CHLORO-5-(4-METHOXYPHENYL)PYRIMIDINE 2-CHLORO-5-(4-METHOXYPHENYL)PYRIMIDINE 27794-03-2 C11H9ClN2O
4-ACETOXYMETHYLPYRIDINE 4-ACETOXYMETHYLPYRIDINE 1007-48-3 C8H9NO2
5-Ethyl-2-thiophenecarboxaldehyde 5-Ethyl-2-thiophenecarboxaldehyde 36880-33-8 C7H8OS
2-(DIMETHYLAMINO)-6-(TRIFLUOROMETHYL)-4-PYRIMIDINOL 2-(DIMETHYLAMINO)-6-(TRIFLUOROMETHYL)-4-PYRIMIDINOL 55545-80-7 C7H8F3N3O
5-Bromo-2-iodo-3-methylpyridine 5-Bromo-2-iodo-3-methylpyridine 376587-52-9 C6H5BrIN
4H-PYRAN-4-ONE 4H-PYRAN-4-ONE 108-97-4 C5H4O2
PROTOVERATRINE B PROTOVERATRINE B 124-97-0 C41H63NO15
6-CHLORO-5-NITROPYRIMIDIN-4-AMINE 6-CHLORO-5-NITROPYRIMIDIN-4-AMINE 4316-94-3 C4H3ClN4O2
5H-CYCLOPENTA[B]PYRIDIN-7-OL, 6,7-DIHYDRO- 5H-CYCLOPENTA[B]PYRIDIN-7-OL, 6,7-DIHYDRO- 41598-71-4 C8H9NO
Tetrahydro-2H-pyran-4-carbonyl chloride Tetrahydro-2H-pyran-4-carbonyl chloride 40191-32-0 C6H9ClO2
4,6-DICHLORO-NICOTINAMIDE 4,6-DICHLORO-NICOTINAMIDE 70593-57-6 C6H4Cl2N2O
2-AMINO-3-CHLORO-5-NITROPYRIDINE 2-AMINO-3-CHLORO-5-NITROPYRIDINE 22353-35-1 C5H4ClN3O2
1-METHYL-5-OXO-PYRROLIDINE-3-CARBOXYLIC ACID 1-METHYL-5-OXO-PYRROLIDINE-3-CARBOXYLIC ACID 42346-68-9 C6H9NO3
1,3-Dihydro-2H-pyrrolo[3,2-b]pyridin-2-one 1,3-Dihydro-2H-pyrrolo[3,2-b]pyridin-2-one 32501-05-6 C7H6N2O
6-PHENYL-PYRIDIN-2-YLAMINE 6-PHENYL-PYRIDIN-2-YLAMINE 39774-25-9 C11H10N2
METHYL PYRIMIDINE-5-CARBOXYLATE METHYL PYRIMIDINE-5-CARBOXYLATE 34253-01-5 C6H6N2O2
2-(4-BROMOPHENOXY)TETRAHYDRO-2H-PYRAN 2-(4-BROMOPHENOXY)TETRAHYDRO-2H-PYRAN 36603-49-3 C11H13BrO2
2-Chloro-6-methoxyisonicotinoyl chloride 2-Chloro-6-methoxyisonicotinoyl chloride 116853-97-5 C7H5Cl2NO2
2,2-DIMETHYL-N-PYRIDIN-4-YL-PROPIONAMIDE 2,2-DIMETHYL-N-PYRIDIN-4-YL-PROPIONAMIDE 70298-89-4 C10H14N2O
BENZYL 4-ISOCYANATOTETRAHYDRO-1(2H)-PYRIDINECARBOXYLATE BENZYL 4-ISOCYANATOTETRAHYDRO-1(2H)-PYRIDINECARBOXYLATE 220394-91-2 C14H16N2O3
4-(3-Hydroxypropylamino)-1,3-dimethyluracil 4-(3-Hydroxypropylamino)-1,3-dimethyluracil 34654-80-3 C9H15N3O3
3-HYDROXY-2-PHENYLPYRIDINE 3-HYDROXY-2-PHENYLPYRIDINE 3308-02-9 C11H9NO
4-AMINO-2-CHLORO-6-METHYL-5-NITROPYRIMIDINE 4-AMINO-2-CHLORO-6-METHYL-5-NITROPYRIMIDINE 5453-06-5 C5H5ClN4O2
1-(CYCLOHEXYLMETHYL)PIPERAZINE 1-(CYCLOHEXYLMETHYL)PIPERAZINE 57184-23-3 C11H22N2
2,6-DICHLORO-3-HYDROXYPYRIDINE-4-CARBOXALDEHYDE 2,6-DICHLORO-3-HYDROXYPYRIDINE-4-CARBOXALDEHYDE 185423-26-1 C6H3Cl2NO2
5-BROMOPYRIDINE-2-CARBOXAMIDE 97%5-BROMOPICOLINAMIDE 5-BROMOPYRIDINE-2-CARBOXAMIDE 97%5-BROMOPICOLINAMIDE 90145-48-5 C6H5BrN2O
METHYL 5-BROMO-2-METHOXYNICOTINATE 98%METHYL 5-BROMO-2-METHOXY-3-PYRIDINECARBOXYLATE METHYL 5-BROMO-2-METHOXYNICOTINATE 98%METHYL 5-BROMO-2-METHOXY-3-PYRIDINECARBOXYLATE 122433-41-4 C8H8BrNO3
2,3-Dichloro-5-(trichloromethyl)pyridine 2,3-Dichloro-5-(trichloromethyl)pyridine 69045-83-6 C6H2Cl5N
2-BROMO-6-CHLORO-3-NITROPYRIDINE 2-BROMO-6-CHLORO-3-NITROPYRIDINE 91678-23-8 C5H2BrClN2O2
5-AMINOPYRIDINE-3-BORONIC ACID, PINACOL ESTER 5-AMINOPYRIDINE-3-BORONIC ACID, PINACOL ESTER 1073354-99-0 C11H17BN2O2
ETHYL 2,6-DICHLORO-5-NITROPYRIMIDINE-4-CARBOXYLATE ETHYL 2,6-DICHLORO-5-NITROPYRIMIDINE-4-CARBOXYLATE 54368-61-5 C7H5Cl2N3O4
2-FLUORO-4-IODO-6-PICOLINE 2-FLUORO-4-IODO-6-PICOLINE 884494-45-5 C6H5FIN
6-Chloro-4-methylnicotinaldehyde 6-Chloro-4-methylnicotinaldehyde 884495-38-9 C7H6ClNO
6-AMINO-5-CHLORO-NICOTINONITRILE 6-AMINO-5-CHLORO-NICOTINONITRILE 156361-02-3 C6H4ClN3
3-AMINOETHYL-1-N-CBZ-PYRROLIDINE 3-AMINOETHYL-1-N-CBZ-PYRROLIDINE C14H20N2O2
3-BROMO-2-METHOXY-6-PICOLINE 3-BROMO-2-METHOXY-6-PICOLINE 717843-47-5 C7H8BrNO
5-METHOXYPYRIDINE-2-CARBOXYLIC ACID 5-METHOXYPYRIDINE-2-CARBOXYLIC ACID 29082-92-6 C7H7NO3
4-(4-FLUOROPHENYL)-1,2,3,6-TETRAHYDROPYRIDINE HYDROCHLORIDE 4-(4-FLUOROPHENYL)-1,2,3,6-TETRAHYDROPYRIDINE HYDROCHLORIDE 1978-61-6 C11H13ClFN
3-(PYRIMIDIN-2-YL)BENZALDEHYDE 3-(PYRIMIDIN-2-YL)BENZALDEHYDE 263349-22-0 C11H8N2O
2,6-Pyridinedicarboxylic acid chloride 2,6-Pyridinedicarboxylic acid chloride 3739-94-4 C7H3Cl2NO2
BIS(1-METHYLPIPERIDIN-4-YL)AMINE BIS(1-METHYLPIPERIDIN-4-YL)AMINE 117927-28-3 C12H25N3
7H-CYCLOPENTA[B]PYRIDIN-7-ONE, 5,6-DIHYDRO- 7H-CYCLOPENTA[B]PYRIDIN-7-ONE, 5,6-DIHYDRO- 31170-78-2 C8H7NO
ALPHA-SEXITHIOPHENE ALPHA-SEXITHIOPHENE 88493-55-4 C24H14S6
2-BENZYLOXY-5-BROMO-PYRIMIDINE 2-BENZYLOXY-5-BROMO-PYRIMIDINE 742058-39-5 C11H9BrN2O
3,4-DIMETHYLTHIOPHENE 3,4-DIMETHYLTHIOPHENE 632-15-5 C6H8S
2-(3-Bromopropoxy)tetrahydro-2H-pyran 2-(3-Bromopropoxy)tetrahydro-2H-pyran 33821-94-2 C8H15BrO2
4-PHENYLPYRIDINE-2-CARBOXYLIC ACID 4-PHENYLPYRIDINE-2-CARBOXYLIC ACID 52565-56-7 C12H9NO2
4-BROMODIBENZOTHIOPHENE 4-BROMODIBENZOTHIOPHENE 97511-05-2 C12H7BrS
3-PYRIMIDIN-5-YLBENZALDEHYDE 3-PYRIMIDIN-5-YLBENZALDEHYDE 640769-70-6 C11H8N2O
5-BROMO-2-CHLOROPYRIDIN-3-YLBORONIC ACID 5-BROMO-2-CHLOROPYRIDIN-3-YLBORONIC ACID 1072944-19-4 C5H4BBrClNO2
5-Amino-3-methylpyridine-2-carbonitrile 5-Amino-3-methylpyridine-2-carbonitrile 252056-70-5 C7H7N3
Coumarin-6-carboxylic acid Coumarin-6-carboxylic acid 7734-80-7 C10H6O4
2-ACETAMIDOPYRIDINE-5-BORONIC ACID PINACOL ESTER, 97% 2-ACETAMIDOPYRIDINE-5-BORONIC ACID PINACOL ESTER, 97% 904326-87-0 C13H19BN2O3
METHYL 3-METHYLPYRIDINE-2-CARBOXYLATE METHYL 3-METHYLPYRIDINE-2-CARBOXYLATE 59718-84-2 C8H9NO2
2-CHLORO-4-METHYL-6-METHYLSULFANYL-PYRIMIDINE 2-CHLORO-4-METHYL-6-METHYLSULFANYL-PYRIMIDINE 89466-59-1 C6H7ClN2S
5,6,7,8-TETRAHYDROISOQUINOLINE 5,6,7,8-TETRAHYDROISOQUINOLINE 36556-06-6 C9H11N
7-HYDROXY-4-(TRIFLUOROMETHYL)COUMARIN 7-HYDROXY-4-(TRIFLUOROMETHYL)COUMARIN 575-03-1 C10H5F3O3
5-Bromo-3-chloro-2-fluoropyridine 5-Bromo-3-chloro-2-fluoropyridine 38185-56-7 C5H2BrClFN
2-BROMO-3,5-DICHLOROISONICOTINIC ACID 2-BROMO-3,5-DICHLOROISONICOTINIC ACID 343781-56-6 C6H2BrCl2NO2
Isoquinoline, 6-chloro- (6CI,9CI) Isoquinoline, 6-chloro- (6CI,9CI) 62882-02-4 C9H6ClN
Phenylisoquinoline Phenylisoquinoline 3297-72-1 C15H11N
2-AMINO-4-METHYL-5-PYRIDINECARBOXYLIC ACID 2-AMINO-4-METHYL-5-PYRIDINECARBOXYLIC ACID 179555-11-4 C7H8N2O2
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