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-Isopropyl-2-methyl-pyrimidine-5-carboxylic	acid 4-Isopropyl-2-methyl-pyrimidine-5-carboxylic acid 127958-08-1 C9H12N2O2
3,5-Dichloro-2,4,6-trimethoxypyridine 3,5-Dichloro-2,4,6-trimethoxypyridine 2412-97-7 C8H9Cl2NO3
4-PYRIDINEMETHANAMINE, ALPHA,ALPHA-DIMETHYL- 4-PYRIDINEMETHANAMINE, ALPHA,ALPHA-DIMETHYL- 566155-76-8 C8H12N2
4-CHLORO-N-ISOPROPYL-PYRIDINE-2-CARBOXAMIDE 4-CHLORO-N-ISOPROPYL-PYRIDINE-2-CARBOXAMIDE 604813-08-3 C9H11ClN2O
2-(dichloromethyl)pyridine 2-(dichloromethyl)pyridine 4377-35-9 C6H5Cl2N
N1-(6-ethoxypyridazin-3-yl)sulphanilamide N1-(6-ethoxypyridazin-3-yl)sulphanilamide 963-14-4 C12H14N4O3S
6-Amino-5-nitro-3-pyridinesulfonic acid 6-Amino-5-nitro-3-pyridinesulfonic acid 62009-38-5 C5H5N3O5S
2-Hydroxy-6-methylpyridine-3-carboxylic acid ethyl ester 2-Hydroxy-6-methylpyridine-3-carboxylic acid ethyl ester 51146-04-4 C9H11NO3
5-BroMo-2-aMino-pyriMidine 5-BroMo-2-aMino-pyriMidine C4H4BrN3
1-(4-BROMOBUTANYL)-4-(2-PYRIMIDINYL)-PIPERAZINE 1-(4-BROMOBUTANYL)-4-(2-PYRIMIDINYL)-PIPERAZINE C12H19BrN4
Thieno[3,2-c]pyridin-4-amine (9CI) Thieno[3,2-c]pyridin-4-amine (9CI) 215453-35-3 C7H6N2S
Furo[2,3-c]pyridine-2-carboxaldehyde (9CI) Furo[2,3-c]pyridine-2-carboxaldehyde (9CI) 112372-06-2 C8H5NO2
Pyridine, 3-(chloromethyl)-5-methyl- (9CI) Pyridine, 3-(chloromethyl)-5-methyl- (9CI) 158876-83-6 C7H8ClN
3-(ChloroMethyl)-2-Methylpyridine 3-(ChloroMethyl)-2-Methylpyridine 120277-68-1 C7H8ClN
ethyl 2-(methylsulfanyl)-4-(trifluoromethyl)pyrimidine-5-carboxylate ethyl 2-(methylsulfanyl)-4-(trifluoromethyl)pyrimidine-5-carboxylate 149771-12-0 C9H9F3N2O2S
2-Methylsulfonyl-4,6-dichloro-5-MethylpyriMidine 2-Methylsulfonyl-4,6-dichloro-5-MethylpyriMidine C6H6Cl2N2O2S
2-Amino-6-methyl-5-nitropyridine 2-Amino-6-methyl-5-nitropyridine C6H7N3O2
ZEBULARINE ZEBULARINE
Pyridine, 2-fluloro-4-chloro-5-bromo- Pyridine, 2-fluloro-4-chloro-5-bromo- C5H2BrClFN
N-Methyl-2-aminopyridine-3-carboxamide N-Methyl-2-aminopyridine-3-carboxamide 870997-87-8 C7H9N3O
4-isothiocyanato-2,6-dimethylpyrimidine 4-isothiocyanato-2,6-dimethylpyrimidine 928714-57-2 C7H7N3S
6-BROMO-4,5-DICHLORO-3(2H)-PYRIDAZINONE 6-BROMO-4,5-DICHLORO-3(2H)-PYRIDAZINONE 933041-14-6 C4HBrCl2N2O
6-CHLORO-IMIDAZO[1,2-A]PYRIDINE-3-CARBONITRILE 6-CHLORO-IMIDAZO[1,2-A]PYRIDINE-3-CARBONITRILE 123531-24-8 C8H4ClN3
1-[3-(Methylsulfonyl)propyl]-piperazine2HCl 1-[3-(Methylsulfonyl)propyl]-piperazine2HCl 910572-80-4 C8H18N2O2S
6-Chloro-5-MethylpyriMidine-4-carboxylic acid 6-Chloro-5-MethylpyriMidine-4-carboxylic acid 933702-12-6 C6H5ClN2O2
(6-Chloro-pyridazin-3-yl)-piperidin-4-ylMethyl-aMine hydrochloride, 98+% C10H16Cl2N4, MW: 263.17 (6-Chloro-pyridazin-3-yl)-piperidin-4-ylMethyl-aMine hydrochloride, 98+% C10H16Cl2N4, MW: 263.17 1185309-61-8 C10H16Cl2N4
4-(thiazol-2-yl)pyriMidin-2-ol 4-(thiazol-2-yl)pyriMidin-2-ol 1269293-34-6 C7H5N3OS
4-aMino-2-(MethylaMino)pyriMidine-5-carbonitrile 4-aMino-2-(MethylaMino)pyriMidine-5-carbonitrile C6H7N5
Ethyl 3-Nitropyridine-2-carboxylate Ethyl 3-Nitropyridine-2-carboxylate 229343-13-9 C8H8N2O4
3-AcetaMido-5-Methylpyridazine 3-AcetaMido-5-Methylpyridazine 1314406-52-4 C7H9N3O
4-PyridazineMethanaMine hydrochloride 4-PyridazineMethanaMine hydrochloride 1351479-13-4 C5H8ClN3
6-isopropylpyridazin-3(2H)-one 6-isopropylpyridazin-3(2H)-one C7H10N2O
2-Bromo-1-(2-fluoropyridin-3-yl)ethanone hydrobromide 2-Bromo-1-(2-fluoropyridin-3-yl)ethanone hydrobromide 1138033-53-0 C7H5BrFNO.HBr
benzyl 4-(triMethylsilylo×y)-5,6-dihydropyridine-1(2H)-carbo×ylate benzyl 4-(triMethylsilylo×y)-5,6-dihydropyridine-1(2H)-carbo×ylate 1147998-34-2 C16H23NO3Si
4,6-Dichloro-3-pyridazinecarboxylic acid 4,6-Dichloro-3-pyridazinecarboxylic acid 1040246-87-4 C5H2Cl2N2O2
3-Isothiocyanatothiophene 3-Isothiocyanatothiophene 61528-50-5 C5H3NS2
Benzotrithiophene Benzotrithiophene 29150-63-8 C12H6S3
(R)-3-AMINO-4-(3-PYRIDYL)-BUTYRIC ACID-2HCL (R)-3-AMINO-4-(3-PYRIDYL)-BUTYRIC ACID-2HCL 269396-64-7 C9H12N2O2
PYRIDINE-2,4-DICARBOXYLIC ACID MONOHYDRATE PYRIDINE-2,4-DICARBOXYLIC ACID MONOHYDRATE 207671-42-9 C7H7NO5
Di-2-pyridylglyoxal Di-2-pyridylglyoxal 492-73-9 C12H8N2O2
ETHYL 7-HYDROXY-4-OXO-4H-CHROMENE-2-CARBOXYLATE ETHYL 7-HYDROXY-4-OXO-4H-CHROMENE-2-CARBOXYLATE 23866-72-0 C12H10O5
PYRIMIDIN-4-OL PYRIMIDIN-4-OL 542-27-8 C4H4N2O
PYRIMIDINES PYRIMIDINES
4-Methoxy-6-methyl-2-(methylthio)pyrimidine 4-Methoxy-6-methyl-2-(methylthio)pyrimidine 55749-33-2 C7H10N2OS
2,5-DICHLOROTHIOPHENE 2,5-DICHLOROTHIOPHENE 173777-89-4 C4H2Cl2S
2(5 H)-THIOPHENONE 2(5 H)-THIOPHENONE 3354-32-3 C4H4OS
3-(2,5-DIBROMOTHIEN-3-YL)PROPANOIC ACID 3-(2,5-DIBROMOTHIEN-3-YL)PROPANOIC ACID 13191-40-7 C7H6Br2O2S
1,4-DIBROMOISOQUINOLINE 1,4-DIBROMOISOQUINOLINE 51206-40-7 C9H5Br2N
2-Pyrimidinecarboxylic acid, 5-hydroxy- (9CI) 2-Pyrimidinecarboxylic acid, 5-hydroxy- (9CI) 345642-87-7 C5H4N2O3
4-Pyrimidinamine, 2-methoxy-6-methyl- (9CI) 4-Pyrimidinamine, 2-methoxy-6-methyl- (9CI) 51870-75-8 C6H9N3O
4-Pyrimidinemethanol, 2-amino-6-methyl- (9CI) 4-Pyrimidinemethanol, 2-amino-6-methyl- (9CI) 110429-43-1 C6H9N3O
5-bromo-2-chloro-4-morpholinopyrimidine 5-bromo-2-chloro-4-morpholinopyrimidine 139502-01-5 C8H9BrClN3O
4,6-Dimethyl-2-methylsulfonylpyrimidine 4,6-Dimethyl-2-methylsulfonylpyrimidine C7H10N2O2S
2 - Methyl sulfoniuM - 4, 6-2 hydroxy pyriMidine 2 - Methyl sulfoniuM - 4, 6-2 hydroxy pyriMidine C5H6N2O2S
3-nitrobenzothiophene 3-nitrobenzothiophene 17402-80-1 C8H5NO2S
BIS(2-THIENYL) KETOXIME BIS(2-THIENYL) KETOXIME 10558-44-8 C9H7NOS2
Pyrimidine, 5-fluoro-2-(methylthio)- (7CI,8CI) Pyrimidine, 5-fluoro-2-(methylthio)- (7CI,8CI) 6090-37-5 C5H5FN2S
Pyridine, 5-fluoro-2-methyl-, 1-oxide (9CI) Pyridine, 5-fluoro-2-methyl-, 1-oxide (9CI) 45673-79-8 C6H6FNO
Pyrimidine, 2-chloro-4-ethynyl- (9CI) Pyrimidine, 2-chloro-4-ethynyl- (9CI) 37968-69-7 C6H3ClN2
4-Pyrimidinecarboxamide, 1,6-dihydro-6-oxo- (6CI) 4-Pyrimidinecarboxamide, 1,6-dihydro-6-oxo- (6CI) 98024-63-6 C5H5N3O2
5-Pyrimidinol, 2-methoxy- (9CI) 5-Pyrimidinol, 2-methoxy- (9CI) 91233-70-4 C5H6N2O2
7H-Pyrazolo[4,3-d]pyrimidin-7-one, 1,6-dihydro-3-methyl- (7CI,9CI) 7H-Pyrazolo[4,3-d]pyrimidin-7-one, 1,6-dihydro-3-methyl- (7CI,9CI) 5399-94-0 C6H6N4O
5,7-dichloro-2,3-dihydrothieno3,4-b1,4dioxine 5,7-dichloro-2,3-dihydrothieno3,4-b1,4dioxine 225518-49-0 C6H4Cl2O2S
4-Chloro-6-(2-methyl-1H-imidazol-1-yl)pyrimidine 4-Chloro-6-(2-methyl-1H-imidazol-1-yl)pyrimidine 941294-31-1 C8H7ClN4
3-(2-Chloroethyl)-2-methyl-9-hydroxy-4H-pyrido[1,2-a]pyrimidin-4-one (Paliperidone) 3-(2-Chloroethyl)-2-methyl-9-hydroxy-4H-pyrido[1,2-a]pyrimidin-4-one (Paliperidone) 260273-82-3 C11H11ClN2O2
2-MORPHOLINOPYRIMIDINE-5-CARBOXYLIC ACID 2-MORPHOLINOPYRIMIDINE-5-CARBOXYLIC ACID 253315-05-8 C9H11N3O3
3-CYANO-2-METHOXY-4-METHYLPRIDINE 3-CYANO-2-METHOXY-4-METHYLPRIDINE
6-(2-HYDROXYPROPAN-2-YL)PYRIDIN-3-YLBORONIC ACID 6-(2-HYDROXYPROPAN-2-YL)PYRIDIN-3-YLBORONIC ACID 1088496-42-7 C8H12BNO3
[(2-OXO-2H-CHROMEN-7-YL)OXY]ACETIC ACID [(2-OXO-2H-CHROMEN-7-YL)OXY]ACETIC ACID 126424-85-9 C11H8O5
(4-fluoropyridin-2-yl)methanamine (4-fluoropyridin-2-yl)methanamine C6H7FN2
pyridazin-3-ylmethanamine hydrochloride pyridazin-3-ylmethanamine hydrochloride 1228788-25-7 C5H8ClN3
6-HYDROXY-7-METHOXY-4-PHENYLCOUMARIN 6-HYDROXY-7-METHOXY-4-PHENYLCOUMARIN 482-83-7 C16H12O4
Poly(3-octylthiophene-2,5-diyl) Poly(3-octylthiophene-2,5-diyl) 104934-51-2 C12H18R2S
TETRA-2-PYRIDINYLPYRAZINE TETRA-2-PYRIDINYLPYRAZINE 25005-97-4 C24H16N6
(S)-BnCH2-PyBox,  (S,S)-2,6-Bis(4-benzylmethyl-2-oxazolin-2-yl)pyridine (S)-BnCH2-PyBox, (S,S)-2,6-Bis(4-benzylmethyl-2-oxazolin-2-yl)pyridine 1012042-02-2 C27H27N3O2
ethyl 4-methoxypyrimidine-5-carboxylate ethyl 4-methoxypyrimidine-5-carboxylate 71133-21-6 C8H10N2O3
2-Amino-5-isopropyl-thiophene-3-carboxylic acid ethyl ester ,97% 2-Amino-5-isopropyl-thiophene-3-carboxylic acid ethyl ester ,97% 65416-85-5 C10H15NO2S
4,6-Dihydroxy-2-methylpyrimidine-5-carbaldehyde 4,6-Dihydroxy-2-methylpyrimidine-5-carbaldehyde 14160-85-1 C6H6N2O3
2-CHLORO-N,6-DIMETHYL-4-PYRIMIDINAMINE 2-CHLORO-N,6-DIMETHYL-4-PYRIMIDINAMINE 3569-33-3 C6H8ClN3
4-BROMO-2-HYDROXYPYRIMIDINE 4-BROMO-2-HYDROXYPYRIMIDINE 548767-83-5 C4H3BrN2O
6-AMINO-3,4-DIHYDRO-2H-ISOQUINOLIN-1-ONE 6-AMINO-3,4-DIHYDRO-2H-ISOQUINOLIN-1-ONE 22246-00-0 C9H10N2O
2-ETHYLOXAZOLO[4,5-B]PYRIDINE 2-ETHYLOXAZOLO[4,5-B]PYRIDINE 52333-88-7 C8H8N2O
6-Bromomethylisoquinoline hydrobromide 6-Bromomethylisoquinoline hydrobromide 188861-57-6 C10H8BrN.HBr
4-chloro-2-phenylpyrimidine-5-carboxylic acid 4-chloro-2-phenylpyrimidine-5-carboxylic acid 343349-20-2 C11H7ClN2O2
2,6-Dichloro-1,4-didihydropyridine-3,5-dicarboxyaldehyde 2,6-Dichloro-1,4-didihydropyridine-3,5-dicarboxyaldehyde 81305-72-8 C7H5Cl2NO2
3,6-Dichloro-4-iodopyridazine 3,6-Dichloro-4-iodopyridazine 130825-13-7 C4HCl2IN2
5-Bromo-2-(tributylstannyl)pyridine 5-Bromo-2-(tributylstannyl)pyridine 611168-46-8 C17H30BrNSn
2-amino-3,4,5,6-tetrahydropyrimidine 2-amino-3,4,5,6-tetrahydropyrimidine 41078-65-3 C4H9N3
(6-Bromo-pyridin-3-ylmethyl)-isopropyl-amine (6-Bromo-pyridin-3-ylmethyl)-isopropyl-amine 1289385-04-1 C9H13BrN2
3-hydrazino-6-phenylpyridazine 3-hydrazino-6-phenylpyridazine 38956-80-8 C10H10N4
4-bromo-5-(1-pyrrolidinyl)-3(2H)-pyridazinone(SALTDATA: FREE) 4-bromo-5-(1-pyrrolidinyl)-3(2H)-pyridazinone(SALTDATA: FREE) 692749-93-2 C8H10BrN3O
(6-Chloro-2-methanesulfonyl-pyrimidin-4-yl)-ethyl-amine (6-Chloro-2-methanesulfonyl-pyrimidin-4-yl)-ethyl-amine 1289386-46-4 C7H10ClN3O2S
7-bromo-5-nitroisoquinoline 7-bromo-5-nitroisoquinoline 1368385-65-2 C9H5BrN2O2
Ethyl 1-(6-Chloropyridazin-3-yl)piperidine-4-carboxylate Ethyl 1-(6-Chloropyridazin-3-yl)piperidine-4-carboxylate 252263-47-1 C12H16ClN3O2
3,5-Dibromo-2-pyridinemethanol 3,5-Dibromo-2-pyridinemethanol 1227601-36-6 C6H5Br2NO
1,4-Dihydro-7H-pyrazolo[4,3-b]pyridin-7-one 1,4-Dihydro-7H-pyrazolo[4,3-b]pyridin-7-one 94220-42-5 C6H5N3O
2-chloro-3-fluoro-5-aminopyridine 2-chloro-3-fluoro-5-aminopyridine C5H4ClFN2
4-(Trifluoromethyl)-2-(methylthio)pyrimidine-5-carboxylic acid 4-(Trifluoromethyl)-2-(methylthio)pyrimidine-5-carboxylic acid 149771-17-5 C7H5F3N2O2S
1-ethylpyridin-2(1H)-one 1-ethylpyridin-2(1H)-one C7H9NO
benzo[b]thiophen-7-ol benzo[b]thiophen-7-ol 77898-35-2 C8H6OS
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