Pyridine compound Pyran compounds Pyridazine compounds Pyrimidines Piperazine compounds Quinoline compounds Pyrazines Isoquinoline compounds Thiophene compounds
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Heterocyclic compound

Pyridine compound Pyran compounds Pyridazine compounds Pyrimidines Piperazine compounds Quinoline compounds Pyrazines Isoquinoline compounds Thiophene compounds
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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:
2-FLUORO-6-PICOLINE-5-BORONIC ACID
CAS:
904326-91-6
MF:
C6H7BFNO2
Structure:
Chemical Name:
ETHYL 6-OXO-2-PHENYL-1,6-DIHYDRO-5-PYRIMIDINECARBOXYLATE
CAS:
55613-22-4
MF:
C13H12N2O3
Structure:
Chemical Name:
3-BROMO-2-FLUORO-5-(TRIFLUOROMETHYL)PYRIDINE
CAS:
1031929-01-7
MF:
C6H2BrF4N
Structure:
Chemical Name:
(4-FLUORO-BENZYL)-PYRIDIN-3-YLMETHYL-AMINE
CAS:
113248-64-9
MF:
C13H13FN2
Structure:
Chemical Name:
2,5-DIMETHYL-1-(2-THIENYLMETHYL)-1H-PYRROLE-3-CARBOXYLIC ACID
CAS:
306936-14-1
MF:
C12H13NO2S
Structure:
Chemical Name:
(5-TRIFLUOROMETHYL-PYRIDIN-2-YL) METHANOL
CAS:
31181-84-7
MF:
C7H6F3NO
Structure:
Chemical Name:
4-(3-Methoxypropoxy)-2,3-dimethylpyridine-N-oxide
CAS:
117977-18-1
MF:
C11H17NO3
Structure:
Chemical Name:
6-METHYL-2H-PYRIDO[1,2-A]PYRIMIDIN-2-ONE
CAS:
16075-68-6
MF:
C9H8N2O
Structure:
Chemical Name:
5-Methylpyridine-3-carboxaldehyde
CAS:
100910-66-5
MF:
C7H7NO
Structure:
Chemical Name:
NAPHTHALEN-1-YLMETHYL-PYRIDIN-4-YLMETHYL-AMINE
CAS:
680185-80-2
MF:
C17H16N2
Structure:
Chemical Name:
7-HYDROXY-4-(4-PYRIDYL)COUMARIN MONOHYDRATE
CAS:
386704-08-1
MF:
C14H11NO4
Structure:
Chemical Name:
5-CHLOROISOQUINOLINE
CAS:
5430-45-5
MF:
C9H6ClN
Structure:
Chemical Name:
2-(BENZYLTHIO)-3-NITROPYRIDINE
CAS:
69212-31-3
MF:
C12H10N2O2S
Structure:
Chemical Name:
4-Amino-3,5-difluoropyridine
CAS:
159783-22-9
MF:
C5H4F2N2
Structure:
Chemical Name:
2,5-DIBROMO-3-AMINOPYRIDINE
CAS:
90902-84-4
MF:
C5H4Br2N2
Structure:
Chemical Name:
Pyrimidine, 4-chloro-2-methoxy- (9CI)
CAS:
51421-99-9
MF:
C5H5ClN2O
Structure:
Chemical Name:
Ethanone, 1-[2-(methylthio)-4-pyrimidinyl]- (9CI)
CAS:
496863-48-0
MF:
C7H8N2OS
Structure:
Chemical Name:
4-Chloro-5-fluoro-2-methylpyridine
CAS:
169750-95-2
MF:
C6H5ClFN
Structure:
Chemical Name:
3,5-DICHLORO-2,6-DIFLUOROPYRIDINE-4-CARBOXALDEHYDE
CAS:
17723-32-9
MF:
C6HCl2F2NO
Structure:
Chemical Name:
7-METHYL-IMIDAZO[1,2-A]PYRIDINE-2-CARBOXYLIC ACID ETHYL ESTER
CAS:
70705-33-8
MF:
C11H12N2O2
Structure:
Chemical Name:
2,3,4,6-TETRAFLUOROPYRIDINE
CAS:
3512-13-8
MF:
C5HF4N
Structure:
Chemical Name:
2-AMINOPYRIDINE-5-SULFONIC ACID
CAS:
16250-08-1
MF:
C5H6N2O3S
Structure:
Chemical Name:
2-Chloromethyl-3-methyl-4-(3-methoxypropoxy)pyridine hydrochloride
CAS:
153259-31-5
MF:
C11H17Cl2NO2
Structure:
Chemical Name:
2,4,6-TRIBROMO-3-PYRIDINOL
CAS:
6602-34-2
MF:
C5H2Br3NO
Structure:
Chemical Name:
3,4,5,6-Tetrachloropyridine-2-carbonitrile
CAS:
17824-83-8
MF:
C6Cl4N2
Structure:
Chemical Name:
2-METHYLNICOTINALDEHYDE
CAS:
60032-57-7
MF:
C7H7NO
Structure:
Chemical Name:
2-METHYL-5-IODOPYRIDINE
CAS:
695-17-0
MF:
C6H6IN
Structure:
Chemical Name:
2-AMINO-5-METHOXYPYRIMIDINE
CAS:
13418-77-4
MF:
C5H7N3O
Structure:
Chemical Name:
tert-Butyl 2-(4-(pyridin-2-yl)benzyl)hydrazinecarboxylate
CAS:
198904-85-7
MF:
C17H21N3O2
Structure:
Chemical Name:
5-BROMO-4-CHLORO-2-METHYLSULFANYL-PYRIMIDINE
CAS:
63810-78-6
MF:
C5H4BrClN2S
Structure:
Chemical Name:
2,6-BIS(TRIFLUOROMETHYL)PYRIDINE
CAS:
455-00-5
MF:
C7H3F6N
Structure:
Chemical Name:
ETHYL 4-PYRIDYLACETATE
CAS:
54401-85-3
MF:
C9H11NO2
Structure:
Chemical Name:
4-Chlorothieno[3,2-c]pyridine
CAS:
27685-94-5
MF:
C7H4ClNS
Structure:
Chemical Name:
2,6-Dichloro-3-(trifluoromethyl)pyridine
CAS:
55304-75-1
MF:
C6H2Cl2F3N
Structure:
Chemical Name:
4,6,8-TRIMETHYLQUINOLINE
CAS:
88565-88-2
MF:
C12H13N
Structure:
Chemical Name:
CHEMPACIFIC 38154
CAS:
84487-04-7
MF:
C5H4BrN3O2
Structure:
Chemical Name:
6-[(3-chloropropyl)amino]-1,3-dimethyluracil
CAS:
34654-81-4
MF:
C9H14ClN3O2
Structure:
Chemical Name:
2-Methyl-1-(3-sulphonatopropyl)quinolinium
CAS:
51583-69-8
MF:
C13H15NO3S
Structure:
Chemical Name:
2-Methoxy-5-fluoro-4-aminopyrimidine
CAS:
1993-63-1
MF:
C5H6FN3O
Structure:
Chemical Name:
2-Amino-4-chloro-6-picoline
CAS:
36340-61-1
MF:
C6H7ClN2
Structure:
Chemical Name:
2-Amino-6-chloro-4-picoline
CAS:
51564-92-2
MF:
C6H7ClN2
Structure:
Chemical Name:
3-Chloro-4-fluoropyridine
CAS:
883107-69-5
MF:
C5H3ClFN
Structure:
Chemical Name:
1,3-Dichloro-6-methoxyisoquinoline
CAS:
24623-39-0
MF:
C10H7Cl2NO
Structure:
Chemical Name:
7H-Pyrrolo[2,3-d]pyrimidin-4-amine sulphate
CAS:
769951-32-8
MF:
C6H8N4O4S
Structure:
Chemical Name:
6-Methoxypyridazine-3-carboxylic acid
CAS:
56434-28-7
MF:
C6H6N2O3
Structure:
Chemical Name:
5-Chloropyridine-2-thiol
CAS:
40771-41-3
MF:
C5H4ClNS
Structure:
Chemical Name:
4-Cyano-3-methylpyridine
CAS:
7584-05-6
MF:
C7H6N2
Structure:
Chemical Name:
2-Bromo-4-methoxypyridine
CAS:
89488-29-9
MF:
C6H6BrNO
Structure:
Chemical Name:
2-TRIFLUOROMETHYL-3-AMINOPYRIDINE
CAS:
106877-32-1
MF:
C6H5F3N2
Structure:
Chemical Name:
6-BENZYL-5,7-DIOXO-OCTAHYDROPYRROLO[3,4-B] PYRIDINE
CAS:
128740-13-6
MF:
C14H16N2O2
Structure:
Chemical Name:
3-OXO-3-(3-PYRIDINYL)PROPANENITRILE
CAS:
30510-18-0
MF:
C8H6N2O
Structure:
Chemical Name:
4,5-Pyrimidinediamine, 2-methoxy
CAS:
104900-51-8
MF:
C5H8N4O
Structure:
Chemical Name:
2-Trifluoromethylpyrimidine
CAS:
116470-67-8
MF:
C5H3F3N2
Structure:
Chemical Name:
6-Trifluoromethyl pyrimidin-4-ylamine
CAS:
672-41-3
MF:
C5H4F3N3
Structure:
Chemical Name:
(4-Pyridylthio)acetic acid
CAS:
10351-19-6
MF:
C7H7NO2S
Structure:
Chemical Name:
2,4-BIS(DIMETHYLAMINO)PYRIMIDINE-6-CARBOXYLIC ACID
CAS:
386715-39-5
MF:
C9H14N4O2
Structure:
Chemical Name:
4-((4-Oxo-1,4-dihydropyriMidin-2-yl)aMino)benzonitrile
CAS:
189956-45-4
MF:
C11H8N4O
Structure:
Chemical Name:
6-METHOXY-1,2,3,4-TETRAHYDROQUINOLINE
CAS:
120-15-0
MF:
C10H13NO
Structure:
Chemical Name:
TETRAHYDRO-2-(2-PROPYNYLOXY)-2H-PYRAN
CAS:
6089-04-9
MF:
C8H12O2
Structure:
Chemical Name:
(5-CHLORO-2-FLUOROPYRIDIN-4-YL)BORONIC ACID
CAS:
1034659-38-5
MF:
C5H4BClFNO2
Structure:
Chemical Name:
4-Amino-5-Hydroxymethyl-2-methylpyrimidine
CAS:
73-67-6
MF:
C6H9N3O
Structure:
Chemical Name:
2-Pyridyl tribromomethyl sulfone
CAS:
59626-33-4
MF:
C6H4Br3NO2S
Structure:
Chemical Name:
2,4-DIMETHYL-PYRIMIDINE-5-CARBOXYLIC ACID
CAS:
74356-36-8
MF:
C7H8N2O2
Structure:
Chemical Name:
5-bromo-4-(trifluoromethyl)pyrimidin-2-amine
CAS:
935534-47-7
MF:
C5H3BrF3N3
Structure:
Chemical Name:
2-AMINO-6-FLUORO-4-METHOXYPYRIMIDINE
CAS:
130687-25-1
MF:
C5H6FN3O
Structure:
Chemical Name:
3-Methoxypyridine-5-boronic acid pinacol ester
CAS:
445264-60-8
MF:
C12H18BNO3
Structure:
Chemical Name:
4-Chloro-2-(methylthio)-6-(propylamino)pyrimidine
CAS:
261765-64-4
MF:
C8H12ClN3S
Structure:
Chemical Name:
N-BUTYL-3-METHYLPYRIDINIUM BROMIDE
CAS:
26576-85-2
MF:
C10H16BrN
Structure:
Chemical Name:
5-Aminoisoindolin-1-one
CAS:
222036-66-0
MF:
C8H8N2O
Structure:
Chemical Name:
2-Pyridinecarboxaldehyde,6-(fluoromethyl)-(9CI)
CAS:
208111-28-8
MF:
C7H6FNO
Structure:
Chemical Name:
5H-Cyclopenta[b]pyridin-5-amine,6,7-dihydro-(9CI)
CAS:
535935-84-3
MF:
C8H10N2
Structure:
Chemical Name:
(2-Chloropyridin-3-yl)methanamine
CAS:
205744-14-5
MF:
C6H7ClN2
Structure:
Chemical Name:
QUINOLINE-2,4-DICARBOXYLIC ACID
CAS:
5323-57-9
MF:
C11H7NO4
Structure:
Chemical Name:
3-CHLORO-2-FLUORO-5-(TRIFLUOROMETHYL)PYRIDINE
CAS:
72537-17-8
MF:
C6H2ClF4N
Structure:
Chemical Name:
Pyrimidine, 2-bromo-5-chloro-
CAS:
124405-67-0
MF:
C4H2BrClN2
Structure:
Chemical Name:
2,4-Dichloro-3-iodopyridine
CAS:
343781-36-2
MF:
C5H2Cl2IN
Structure:
Chemical Name:
1-(5-Nitro-2-pyridinyl)piperidine-4-carboxylic acid
CAS:
868077-44-5
MF:
C11H13N3O4
Structure:
Chemical Name:
DIMETHYL 5-BROMOPYRIDINE-2,3-DICARBOXYLATE
CAS:
98555-51-2
MF:
C7H4BrNO4
Structure:
Chemical Name:
5-BROMO-2-FLUORONICOTINIC ACID
CAS:
29241-66-5
MF:
C6H3BrFNO2
Structure:
Chemical Name:
4-Chlorobenzofuro[3,2-d]pyrimidine
CAS:
39876-88-5
MF:
C10H5ClN2O
Structure:
Chemical Name:
4,5-Dichloro-6-ethylpyrimidine
CAS:
115617-41-9
MF:
C6H6Cl2N2
Structure:
Chemical Name:
2,3-DIBROMO-4-METHYLTHIOPHENE
CAS:
125257-38-7
MF:
C5H4Br2S
Structure:
Chemical Name:
2-METHYLTHIO-4-BROMOPYRIMIDINE
CAS:
959236-97-6
MF:
C5H5BrN2S
Structure:
Chemical Name:
4-Bromo-2,6-diethyl-pyridine
CAS:
877133-54-5
MF:
C9H12BrN
Structure:
Chemical Name:
4-(5-bromopyrimidin-2-yloxy)benzenamine
CAS:
76660-37-2
MF:
C10H8BrN3O
Structure:
Chemical Name:
benzyl 3,4-dihydro-2-methyl-4-oxopyridine-1(2H)-carboxylate
CAS:
190906-91-3
MF:
C14H15NO3
Structure:
Chemical Name:
Des-N-(methoxycarbonyl)-L-tert-leucine Bis-Boc Atazanavir
CAS:
198904-86-8
MF:
C32H42N4O5
Structure:
Chemical Name:
Methyl-5-bromo-2 pyrimidine carboxylate
CAS:
89581-38-4
MF:
C6H5BrN2O2
Structure:
Chemical Name:
2-METHOXYLYPYRIDINE-4-BORONIC ACID PINACOLATE
CAS:
408502-23-8
MF:
C12H18BNO3
Structure:
Chemical Name:
5,6-DIHYDRO-6-METHYLURACIL
CAS:
2434-49-3
MF:
C5H8N2O2
Structure:
Chemical Name:
2-Benzylpiperazine
CAS:
84477-71-4
MF:
C11H16N2
Structure:
Chemical Name:
7-(TRIFLUOROMETHYL)IMIDAZO[1,2-A]PYRIMIDINE
CAS:
375857-66-2
MF:
C7H4F3N3
Structure:
Chemical Name:
6-METHYL-2,3-PYRIDINEDICARBOXYLIC ACID
CAS:
53636-70-7
MF:
C8H7NO4
Structure:
Chemical Name:
5-tert-butyl 2-ethyl 6,7-dihydrothiazolo[5,4-c]pyridine-2,5(4H)-dicarboxylate
CAS:
1053656-51-1
MF:
C14H20N2O4S
Structure:
Chemical Name:
2-METHYLPYRIDINE-4-SULFONIC ACID
CAS:
408533-46-0
MF:
C6H7NO3S
Structure:
Chemical Name:
3-BROMOISONICOTINIC ACID METHYL ESTER
CAS:
59786-31-1
MF:
C7H6BrNO2
Structure:
Chemical Name:
4-(5-NITROPYRIDIN-2-YL)BENZOIC ACID
CAS:
223127-49-9
MF:
C12H8N2O4
Structure:
Chemical Name:
2,6-DIMETHYLPYRIDINIUM P-TOLUENESULFONATE
CAS:
93471-41-1
MF:
C14H17NO3S
Structure:
Chemical Name:
2,6-Dimethoxypyridine-3-carboxylic acid
CAS:
16727-43-8
MF:
C8H9NO4
Structure:
Chemical Name:
ETHYL PYRROLO[1,2-C]PYRIMIDINE-3-CARBOXYLATE
CAS:
107407-80-7
MF:
C10H10N2O2