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:
4,6-Dihydrothieno[3,4-b]thiophene-2-carboxylic acid
CAS:
7712-05-2
MF:
C7H6O2S2
Structure:
Chemical Name:
17-Iodoandrosta-5,16-dien-3beta-ol
CAS:
32138-69-5
MF:
C19H27IO
Structure:
Chemical Name:
3-BroMo-5fluoro-4-Methylpyridine
CAS:
1211517-76-8
MF:
C6H5BrFN
Structure:
Chemical Name:
1-(2-Fluoro-6-(trifluoromethyl)benzyl)-6-methylpyrimidine-2,4(1H,3H)-dione
CAS:
830346-47-9
MF:
C13H10F4N2O2
Structure:
Chemical Name:
cis-Octahydro-1H-isoindole hydrochloride
CAS:
161829-92-1
MF:
C8H16ClN
Structure:
Chemical Name:
2-bromothiazol-4-amine
CAS:
41731-33-3
MF:
C3H3BrN2S
Structure:
Chemical Name:
1H-PYRROLO[2,3-C]PYRIDINE-2-CARBALDEHYDE
CAS:
867034-96-6
MF:
C8H6N2O
Structure:
Chemical Name:
6-HYDROXYMETHYLINDOLE
CAS:
1075-26-9
MF:
C9H9NO
Structure:
Chemical Name:
7-CHLORO-1H-PYRROLO[2,3-C]PYRIDINE
CAS:
357263-41-3
MF:
C7H5ClN2
Structure:
Chemical Name:
7-Methyl-1,8-naphthyridin-2-amine
CAS:
1568-93-0
MF:
C9H9N3
Structure:
Chemical Name:
(R)-1-Boc-3-methylpiperazine
CAS:
163765-44-4
MF:
C10H20N2O2
Structure:
Chemical Name:
3-Ethynylimidazo[1,2-b]pyridazine
CAS:
943320-61-4
MF:
C8H5N3
Structure:
Chemical Name:
4-Chloro-6-methoxy-7-[(1-methylpiperidin-4-yl)methoxy]quinazoline
CAS:
264208-72-2
MF:
C16H20ClN3O2
Structure:
Chemical Name:
3-METHYL-1,3-THIAZOLANE-2,4-DIONE
CAS:
16312-21-3
MF:
C4H5NO2S
Structure:
Chemical Name:
3-IODO-1-METHYL-1H-INDAZOLE
CAS:
52088-10-5
MF:
C8H7IN2
Structure:
Chemical Name:
5-BROMO-2-CHLORO-1H-BENZIMIDAZOLE
CAS:
683240-76-8
MF:
C7H4BrClN2
Structure:
Chemical Name:
2-CHLORO-4-PHENYLQUINAZOLINE
CAS:
29874-83-7
MF:
C14H9ClN2
Structure:
Chemical Name:
3-(4,6-dimethyl-2-oxopyrimidin-1(2H)-yl)propanoic acid
CAS:
764642-23-1
MF:
C9H12N2O3
Structure:
Chemical Name:
1-CYCLOPROPYLPIPERAZINE DIHYDROCHLORIDE
CAS:
139256-79-4
MF:
C7H16Cl2N2
Structure:
Chemical Name:
(S)-2-(2,2,2-TRIFLUORO-ETHYL)-PIPERAZINE
CAS:
1240584-16-0
MF:
C6H11F3N2
Structure:
Chemical Name:
6,6-Difluoro-[1,4]Diazepane-1-Carboxylic Acid Tert-Butyl Ester(WX630010)
CAS:
1166820-07-0
MF:
C10H18F2N2O2
Structure:
Chemical Name:
1,1,1-Trifluoro-2,3-epoxypropane
CAS:
359-41-1
MF:
C3H3F3O
Structure:
Chemical Name:
2-bromo-7-propyl-[1,3,4]thiadiazolo[3,2-a]pyrimidin-5-one
CAS:
1210532-02-7
MF:
C8H8BrN3OS
Structure:
Chemical Name:
METHYL 2-FLUORO-4-NITROBENZENECARBOXYLATE
CAS:
392-09-6
MF:
C8H6FNO4
Structure:
Chemical Name:
Ethyl 2-Chloro-5-fluoropyrimidine-4-carboxylate
CAS:
1246632-85-8
MF:
C7H6ClFN2O2
Structure:
Chemical Name:
Methyl oxindole-5-carboxylate
CAS:
199328-10-4
MF:
C10H9NO3
Structure:
Chemical Name:
(3,5-Di-tert-butylphenyl)boronic acid
CAS:
197223-39-5
MF:
C14H23BO2
Structure:
Chemical Name:
1,3,5-TRIBENZYLHEXAHYDRO-1,3,5-TRIAZINE
CAS:
2547-66-2
MF:
C24H27N3
Structure:
Chemical Name:
5-BROMO-3-HYDROXY (1H)INDAZOLE
CAS:
7364-27-4
MF:
C7H5BrN2O
Structure:
Chemical Name:
(2S,4R)-Methyl 4-hydroxypyrrolidine-2-carboxylate
CAS:
1499-56-5
MF:
C6H11NO3
Structure:
Chemical Name:
2-Methyl-2-thiazoline-4-carboxylic Acid Sodium Salt
CAS:
15058-19-2
MF:
C5H6NNaO2S
Structure:
Chemical Name:
tert-Butyl 4-(2-ethoxy-2-oxoethyl)piperidine-1-carboxylate
CAS:
135716-09-5
MF:
C14H25NO4
Structure:
Chemical Name:
Isoxazole
CAS:
288-14-2
MF:
C3H3NO
Chemical Name:
(S)-2-(2,2-difluoroethyl)piperazine
Chemical Name:
(S)-2-(2,2-difluoroethyl)piperazine dihydrochloride
Chemical Name:
(R)-2-(2,2,2-trifluoroethyl)piperazine dihydrochloride
Structure:
Chemical Name:
2-phenyl-5H,6H,7H-cyclopenta[d]pyrimidin-4-ol
CAS:
87753-08-0
MF:
C13H12N2O
Structure:
Chemical Name:
2-Methyl-6-(2,2,2-trifluoroethyl)thieno[2,3-d]pyrimidin-4(3H)-one
CAS:
2163770-66-7
MF:
C9H7F3N2OS
Structure:
Chemical Name:
Pyrroloquinoline quinone disodium salt
CAS:
122628-50-6
MF:
C14H4N2Na2O8
Structure:
Chemical Name:
Methyl indole-2-carboxylate
CAS:
1202-04-6
MF:
C10H9NO2
Structure:
Chemical Name:
4H-Cyclopentapyrimidin-4-one, 2-chloro-1,5,6,7-tetrahydro- (9CI)
CAS:
178308-48-0
MF:
C7 H7 Cl N2 O
Structure:
Chemical Name:
2-CHLORO-4-METHYL-6-(TRIFLUOROMETHYL)PYRIMIDINE
CAS:
241164-09-0
MF:
C6H4ClF3N2
Structure:
Chemical Name:
Methyl 3-nitrophenylacetate
CAS:
10268-12-9
MF:
C9H9NO4
Structure:
Chemical Name:
6-METHOXY-2-METHYL-1H-INDOLE
CAS:
1968-13-4
MF:
C10H11NO
Structure:
Chemical Name:
5-oxoproline, compound with piperazine (1:1)
CAS:
4889-40-1
MF:
C5H7NO3.C4H10N2
Structure:
Chemical Name:
(S)-3-(dimethylamino)-1-(3-methoxyphenyl)-2-methylpropan-1-one
CAS:
850222-40-1
MF:
C13H19NO2
Structure:
Chemical Name:
1-BENZOTHIOPHEN-3(2H)-ONE
CAS:
130-03-0
MF:
C8H6OS
Structure:
Chemical Name:
5,7-DIBROMO INDOLE
CAS:
36132-08-8
MF:
C8H5Br2N
Structure:
Chemical Name:
Isoquinoline, 6-(1-methylethyl)- (9CI)
CAS:
790304-84-6
MF:
C12H13N
Structure:
Chemical Name:
4(1H)-Pyrimidinone, 2-amino-5-hydroxy-6-methyl- (9CI)
CAS:
14405-13-1
MF:
C5H7N3O2
Chemical Name:
tert-butyl 4-[2-(2,6-dioxo-3-piperidyl)-6-fluoro-1,3-dioxo-isoindolin-5-yl]piperazine-1-carboxyl ate
Structure:
Chemical Name:
4-Chloro-2-mercaptobenzothiazole
CAS:
1849-65-6
MF:
C7H4ClNS2
Structure:
Chemical Name:
2-(2-METHOXYPHENYL)-4,4-DIMETHYL-2-OXAZOLINE
CAS:
57598-33-1
MF:
C12H15NO2
Structure:
Chemical Name:
2-(3-Chloro-phenyl)-pyrrolidine
CAS:
298690-74-1
MF:
C10H12ClN
Structure:
Chemical Name:
4-(4-(5-fluoropyrimidin-2-yl)piperazin-1-yl)aniline
CAS:
1921374-52-8
MF:
C14H16FN5
Structure:
Chemical Name:
2-methyl-8-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)benzofuro[2,3-b]pyridine
CAS:
1609374-04-0
MF:
C18H20BNO3
Structure:
Chemical Name:
1-BOC-4-(4-BROMO-PHENYLAMINO)-PIPERIDINE
CAS:
443998-65-0
MF:
C16H23BrN2O2
Structure:
Chemical Name:
4-(aminomethyl)-N,N,6-trimethylpyrimidin-2-amine
CAS:
1177480-26-0
MF:
C8H14N4
Structure:
Chemical Name:
4 5-DIAMINO-6-HYDROXY-2-MERCAPTOPYRIMID&
CAS:
304851-89-6
MF:
C4H6N4OS.H2O.H2O4S
Structure:
Chemical Name:
6-Methoxy-1,2,3,4-tetrahydroisoquinoline hydrochloride
CAS:
57196-62-0
MF:
C10H14ClNO
Chemical Name:
1-but-3-enyl-4-(2,3-chloro-phenyl)-piperazine
Chemical Name:
(R)-2-(2-fluoroethyl)piperazine
Structure:
Chemical Name:
TERT-BUTYL 3-(4,4,5,5-TETRAMETHYL-1,3,2-DIOXABOROLAN-2-YL)-1H-PYRROLO[3,2-C]PYRIDINE-1-CARBOXYLATE
CAS:
877060-60-1
MF:
C18H25BN2O4
Structure:
Chemical Name:
2-Bromo-5-nitrothiazole
CAS:
3034-48-8
MF:
C3HBrN2O2S
Structure:
Chemical Name:
4-Bromopyrazolo[1,5-a]pyridine-3-carbonitrile
CAS:
2092153-80-3
MF:
C8H4BrN3
Structure:
Chemical Name:
4,6-DICHLORO-1H-PYRROLO-[3,2-C]-PYRIDINE
CAS:
67139-79-1
MF:
C7H4Cl2N2
Structure:
Chemical Name:
Acefylline Piperazine
CAS:
18428-63-2
MF:
C100H150N46O32
Structure:
Chemical Name:
(R)-2-(2-Chlorophenyl)pyrrolidine
CAS:
823188-58-5
MF:
C10H12ClN
Structure:
Chemical Name:
zinc pivalate
CAS:
15827-10-8
MF:
C10H18O4Zn
Structure:
Chemical Name:
N-methyl-N-((3R,4R)-4-methylpiperidin-3-yl)-7H-pyrrolo[2,3-d]pyrimidin-4-amine
CAS:
477600-74-1
MF:
C13H19N5
Structure:
Chemical Name:
2-Piperidinecarboxylic acid, 5-[(phenylmethoxy)amino]-, ethyl ester, ethanedioate (1:1), (2R,5S)-
CAS:
2413365-40-7
MF:
C17H24N2O7
Structure:
Chemical Name:
2(1H)-Pyrimidinone, hydrazone (9CI)
CAS:
7504-94-1
MF:
C4H6N4
Chemical Name:
tert-butyl 4-[2-(2,6-dioxopiperidin-3-yl)-1,3-dioxo-2,3-dihydro-1H-isoindol-5-yl]piperazine-1-c arboxylate
Structure:
Chemical Name:
6-ETHOXYCARBONYLINDOLE-2-CARBOXYLIC ACID ETHYL ESTER
CAS:
107516-75-6
MF:
C14H15NO4
Structure:
Chemical Name:
1,2,5-Thiadiazoles
CAS:
288-39-1
MF:
C2H2N2S
Structure:
Chemical Name:
3,6-dimethyl-1h-pyrimidine-2,4-dione
CAS:
19674-60-3
MF:
C6H8N2O2
Structure:
Chemical Name:
7-Aminoisoquinoline
CAS:
23707-37-1
MF:
C9H8N2
Structure:
Chemical Name:
3-Bromopyridine-2,6-dicarboxylic acid
CAS:
316808-10-3
MF:
C7H4BrNO4
Structure:
Chemical Name:
6-CHLORO-1H-PYRROLO[3,2-B]PYRIDINE
CAS:
1021339-19-4
MF:
C7H5ClN2
Structure:
Chemical Name:
4-bromoisoindolin-1-one
CAS:
337536-15-9
MF:
C8H6BrNO
Structure:
Chemical Name:
N-(4-(2-aminoacetyl)-5-methoxy-2-phenoxyphenyl)methanesulfonamide hydrochloride
CAS:
149436-41-9
MF:
C16H19ClN2O5S
Structure:
Chemical Name:
4-bromo-7-chloro-1H-pyrrolo[2,3-c]pyridine
CAS:
425380-38-7
MF:
C7H4BrClN2
Structure:
Chemical Name:
3-Bromophthalide
CAS:
6940-49-4
MF:
C8H5BrO2
Structure:
Chemical Name:
1,4-Bis(4-amino-2-trifluoromethylphenoxy)benzene
CAS:
94525-05-0
MF:
C20H14F6N2O2
Structure:
Chemical Name:
2-Dimethylamino-pyrimidine-5-boronic acid pinacol ester
CAS:
1032759-30-0
MF:
C12H20BN3O2
Structure:
Chemical Name:
Methyl 10-(2,5-dioxo-2,5-dihydro-1H-pyrrol-1-yl)-9-methoxy-3-oxo-3H-benzo[f]chromene-2-carboxylate
CAS:
137350-66-4
MF:
C20H13NO7
Structure:
Chemical Name:
(E)-6-Iodo-3-[2-(pyridin-2-yl)ethenyl]-1-(tetrahydro-2H-pyran-2-yl)-1H-indazole
CAS:
886230-77-9
MF:
C19H18IN3O
Structure:
Chemical Name:
4,6-Dimethoxypyrimidin-5-methyl amine
CAS:
1118786-90-5
MF:
C7H11N3O2
Structure:
Chemical Name:
4,6-Difluoro-2-Methylsulfanyl-pyriMidine
CAS:
122815-08-1
MF:
C5H4F2N2S
Structure:
Chemical Name:
Islatravir
CAS:
865363-93-5
MF:
C12H12FN5O3
Structure:
Chemical Name:
8-QuinolinaMine, 5,6,7,8-tetrahydro-, hydrochloride (1:2), (8S)-
CAS:
865303-57-7
MF:
C9H14Cl2N2
Structure:
Chemical Name:
(R,E)-5-([1,1'-biphenyl]-4-yl)-4-((tert-butoxycarbonyl)aMino)-2-Methylpent-2-enoic acid
CAS:
1012341-48-8
MF:
C23H27NO4
Structure:
Chemical Name:
4,6-dichloro-5-(4-chlorophenyl)-pyriMidine
CAS:
3974-18-3
MF:
C10H5Cl3N2
Structure:
Chemical Name:
(R,R)-2,2'-(2,6-PYRIDINEDIYL)BIS(4-ISOPROPYL-2-OXAZOLINE)
CAS:
131864-67-0
MF:
C17H23N3O2
Structure:
Chemical Name:
2,4-dichloropyrido[3',2':4,5]furo[3,2-d]pyrimidine
CAS:
1268241-74-2
MF:
C9H3Cl2N3O
Structure:
Chemical Name:
2-bromo-5-phenylpyrimidine
CAS:
155079-14-4
MF:
C10H7BrN2
Structure:
Chemical Name:
(1R,2R)-2-amino-6-(4-nitrophenyl)-1-phenylhex-5-yn-1-olhydrochloride
CAS:
1628836-08-7
MF:
C18H19ClN2O3
Structure:
Chemical Name:
(S)-1-(6-(4-fluoro-1H-pyrazol-1-yl)pyridin-3-yl)ethanamine
CAS:
1980023-96-8
MF:
C10H11FN4
Structure:
Chemical Name:
4,6-Dichloro-2-(4-chloro-3-fluorophenyl)pyrimidine
CAS:
1190735-18-2
MF:
C10H4Cl3FN2
Structure:
Chemical Name:
1-(4-TERT-BUTYLBENZYL)PIPERAZINE
CAS:
956-61-6
MF:
C15H24N2