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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
2-(1H-pyrrol-1-yl)pyridin-4-amine 2-(1H-pyrrol-1-yl)pyridin-4-amine 1354221-50-3 C9H9N3
4-BROMO-3-CHLOROANILINE 4-BROMO-3-CHLOROANILINE 21402-26-6 C6H5BrClN
3-BROMO-4-(4'-METHOXYPHENYL)PYRIDINE 3-BROMO-4-(4'-METHOXYPHENYL)PYRIDINE 88345-97-5 C12H10BrNO
6-Bromobenzothiazole 6-Bromobenzothiazole 53218-26-1 C7H4BrNS
Dydrogesterone bis(Ethylene Acetal) Dydrogesterone bis(Ethylene Acetal) 5488-51-7 C25H36O4
5-AMino-2-ethylpyriMidine 5-AMino-2-ethylpyriMidine 1152519-74-8 C6H9N3
4-Hydroxy ThalidoMide 4-Hydroxy ThalidoMide 5054-59-1 C13H10N2O5
5-fluoro-2-Methyl-4-(4,4,5,5-tetraMethyl-1,3,2-dioxaborolan-2-yl)pyridine 5-fluoro-2-Methyl-4-(4,4,5,5-tetraMethyl-1,3,2-dioxaborolan-2-yl)pyridine 1788062-13-4 C12H17BFNO2
3-broMo-1H-pyrazole-4-carbonitrile 3-broMo-1H-pyrazole-4-carbonitrile 1703808-52-9 C4H2BrN3
(2R,4S)-4-Amino-5-(biphenyl-4-yl)-2-methylpentanoic Acid Ethyl Ester Hydrochloride (2R,4S)-4-Amino-5-(biphenyl-4-yl)-2-methylpentanoic Acid Ethyl Ester Hydrochloride 149690-12-0 C20H26ClNO2
2-(6-BroMopyridin-2-yl)oxazole 2-(6-BroMopyridin-2-yl)oxazole 1211524-14-9 C8H5BrN2O
2-MorpholinopyriMidin-4-aMine 2-MorpholinopyriMidin-4-aMine 18215-94-6 C8H12N4O
5-(2-Fluoro-3-methoxyphenyl)-1-[[2-fluoro-6-(trifluoromethyl)phenyl]methyl]-6-methyl-2,4(1H,3H)-pyrimidinedione 5-(2-Fluoro-3-methoxyphenyl)-1-[[2-fluoro-6-(trifluoromethyl)phenyl]methyl]-6-methyl-2,4(1H,3H)-pyrimidinedione 1150560-59-0 C20H15F5N2O3
3-Bromo-5-(2-furanyl)pyridine 3-Bromo-5-(2-furanyl)pyridine 1211588-87-2 C9H6BrNO
6-Chloro-2-naphthylsulfonyl chloride 6-Chloro-2-naphthylsulfonyl chloride 102153-63-9 C10H6Cl2O2S
S-23 S-23 1010396-29-8 C18H13ClF4N2O3
5-bromo-2-methoxy-4-methylthiazole 5-bromo-2-methoxy-4-methylthiazole 1314354-69-2 C5H6BrNOS
2-ethyl-pyridin-4-ol 2-ethyl-pyridin-4-ol 1159817-56-7 C7H9NO
tert-butyl 3-(tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrrolo[2,3-c]pyridine-1-carboxylate tert-butyl 3-(tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrrolo[2,3-c]pyridine-1-carboxylate 1174038-67-5 C18H25BN2O4
2,4-Dibromo-6-(trifluoromethyl)pyridine 2,4-Dibromo-6-(trifluoromethyl)pyridine 1211539-45-5 C6H2Br2F3N
2-Bromo-3-isopropoxypyridine 2-Bromo-3-isopropoxypyridine 113503-65-4 C8H10BrNO
4-Bromo-2-fluorothiazole 4-Bromo-2-fluorothiazole 1207608-60-3 C3HBrFNS
2,4-Dichloro-6-isopropylpyrimidine 2,4-Dichloro-6-isopropylpyrimidine 89938-05-6 C7H8Cl2N2
4-(4-(pyrimidin-2-yl)piperazin-1-yl)butan-1-ol 4-(4-(pyrimidin-2-yl)piperazin-1-yl)butan-1-ol 223461-35-6 C12H20N4O
Ethyl 4-(4-cyanophenyl)butanoate Ethyl 4-(4-cyanophenyl)butanoate 131379-33-4 C13H15NO2
1-Phenyl-1h-imidazol-5-amine 1-Phenyl-1h-imidazol-5-amine 799813-62-0 C9H9N3
5-bromo-2-(cyclohexyloxy)Pyridine 5-bromo-2-(cyclohexyloxy)Pyridine 927202-78-6 C11H14BrNO
Dibenzofuran, 1-nitro-
Dibenzofuran, 1-nitro- 87812-99-5 C12H7NO3
5-chloro-N-methyl-2-Pyrazinecarboxamide 5-chloro-N-methyl-2-Pyrazinecarboxamide 1049025-94-6 C6H6ClN3O
tert-butyl 4-(4-methyl-3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl)piperidine-1-carboxylate tert-butyl 4-(4-methyl-3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl)piperidine-1-carboxylate 2256709-01-8 C23H36BNO4
3-bromo-4-cyclopropylpyridine 3-bromo-4-cyclopropylpyridine 1357094-98-4 C8H8BrN
2-(cyclopentyloxy)-6-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)Pyrazine 2-(cyclopentyloxy)-6-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)Pyrazine 1416253-01-4 C15H23BN2O3
4-tert-butylpyridin-2(1H)-one 4-tert-butylpyridin-2(1H)-one 33252-22-1 C9H13NO
2-amino-4-(4-pyridinyl)-1,3,5-triazine 2-amino-4-(4-pyridinyl)-1,3,5-triazine 143261-63-6 C8H7N5
4-(2-METHOXY-PHENYL)-THIAZOL-2-YLAMINE 4-(2-METHOXY-PHENYL)-THIAZOL-2-YLAMINE 93209-95-1 C10H10N2OS
2,4-dichloro-5-cyclobutylpyrimidine 2,4-dichloro-5-cyclobutylpyrimidine 1563535-12-5 C8H8Cl2N2
2-amino-4-chloro-6-cyclobutylpyrimidine 2-amino-4-chloro-6-cyclobutylpyrimidine 199863-85-9 C8H10ClN3
5-(4-hydroxyphenyl)-2(1H)-Pyridinone 5-(4-hydroxyphenyl)-2(1H)-Pyridinone 41216-12-0 C11H9NO2
3-bromo-5-(1-piperidinyl)Pyridine 3-bromo-5-(1-piperidinyl)Pyridine 24255-93-4 C10H13BrN2
3-bromo-4-methoxy-5-methylpyridine 3-bromo-4-methoxy-5-methylpyridine 1256807-69-8 C7H8BrNO
6-(2-pyridinyl)-2(1H)-Pyrimidinone 6-(2-pyridinyl)-2(1H)-Pyrimidinone 126126-64-5 C9H7N3O
2-(3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl)pyrazine 2-(3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl)pyrazine 1314389-98-4 C16H19BN2O2
5-propylpyridin-2-amine hydrochloride 5-propylpyridin-2-amine hydrochloride 92410-92-9 C8H12N2
(S)-5-((2,5-dioxopyrrolidin-1-yl)oxy)-5-oxo-2-palmitamidopentanoic acid (S)-5-((2,5-dioxopyrrolidin-1-yl)oxy)-5-oxo-2-palmitamidopentanoic acid 294855-91-7 C25H42N2O7
lumateperone (Tosylate) lumateperone (Tosylate) 1187020-80-9 C31H36FN3O4S
3-Bromo-5-(prop-1-en-2-yl)pyridine 3-Bromo-5-(prop-1-en-2-yl)pyridine 118775-69-2 C8H8BrN
2(1H)-Pyridinone, 6-(1,1-dimethylethyl)- 2(1H)-Pyridinone, 6-(1,1-dimethylethyl)- 58498-57-0 C9H13NO
2-tert-butyl-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)thiazole 2-tert-butyl-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)thiazole 1283180-63-1 C13H22BNO2S
7-(Difluoromethyl)Quinoline 7-(Difluoromethyl)Quinoline 1261728-71-5 C10H7F2N
4-bromo-2-tert-butylthiazole 4-bromo-2-tert-butylthiazole 959238-21-2 C7H10BrNS
2-(6-Bromopyridin-3-yl)propan-2-ol 2-(6-Bromopyridin-3-yl)propan-2-ol 477252-29-2 C8H10BrNO
1-(2-Methoxyphenyl)-1H-imidazol-2-amine 1-(2-Methoxyphenyl)-1H-imidazol-2-amine 1703011-74-8 C10H11N3O
1-(4-Bromophenyl)-1H-imidazol-2-amine 1-(4-Bromophenyl)-1H-imidazol-2-amine 1698717-00-8 C9H8BrN3
4(1H)-Pyrimidinone, 6-methyl-2-(3-pyridinyl)- 4(1H)-Pyrimidinone, 6-methyl-2-(3-pyridinyl)- 16879-57-5 C10H9N3O
4-(4-BroMophenyl)tetrahydro-2H-pyran 4-(4-BroMophenyl)tetrahydro-2H-pyran 811828-76-9 C11H13BrO
6-Chloro-4-iodo-1H-indazole 6-Chloro-4-iodo-1H-indazole 885519-56-2 C7H4ClIN2
2-Bromo-4-(tert-butyl)pyridine 2-Bromo-4-(tert-butyl)pyridine 50488-34-1 C9H12BrN
4-Methoxybenzo[b]thiophene 4-Methoxybenzo[b]thiophene 3781-90-6 C9H8OS
(S)-1-N-BOC-2-METHYL PIPERAZINE-HCl (S)-1-N-BOC-2-METHYL PIPERAZINE-HCl 960283-58-3 C10H21ClN2O2
5-(4-Methoxyphenyl)-1,2-dihydropyridin-2-one 5-(4-Methoxyphenyl)-1,2-dihydropyridin-2-one 53242-51-6 C12H11NO2
1H-IMidazole, 2-[4-(4,4,5,5-tetraMethyl-1,3,2-dioxaborolan-2-yl)phenyl]- 1H-IMidazole, 2-[4-(4,4,5,5-tetraMethyl-1,3,2-dioxaborolan-2-yl)phenyl]- 1229584-17-1 C15H19BN2O2
2-Methylpyrido[3,4-d]pyriMidin-4-ol 2-Methylpyrido[3,4-d]pyriMidin-4-ol 22389-85-1 C8H7N3O
(R)-(1-Tetrahydrofuran-3-yl)MethanaMine hydrochloride (R)-(1-Tetrahydrofuran-3-yl)MethanaMine hydrochloride 1400744-17-3 C5H8ClNO
5-BroMo-4-fluoropyridin-2-aMine 5-BroMo-4-fluoropyridin-2-aMine 944401-69-8 C5H4BrFN2
3-cyclopropylpyridin-2-aMine 3-cyclopropylpyridin-2-aMine 878805-25-5 C8H10N2
5-cyclopropylpyridin-2-ol 5-cyclopropylpyridin-2-ol 1159821-42-7 C8H9NO
6-Chloro-4-methylpyridazin-3-amine 6-Chloro-4-methylpyridazin-3-amine 64068-00-4 C5H6ClN3
5-broMo-N,N-diethylpyridin-2-aMine 5-broMo-N,N-diethylpyridin-2-aMine 1176424-62-6 C9H13BrN2
2-(1H-IMidazol-1-yl)-5-(4,4,5,5-tetraMethyl-1,3,2-dioxaborolan-2-yl)pyriMidine 2-(1H-IMidazol-1-yl)-5-(4,4,5,5-tetraMethyl-1,3,2-dioxaborolan-2-yl)pyriMidine 1160790-26-0 C13H17BN4O2
5-BroMo-4-fluoro-2-nitroaniline 5-BroMo-4-fluoro-2-nitroaniline 1052686-50-6 C6H4BrFN2O2
3-Hydroxy-5-(2-trifluoroMethylphenyl)pyridine 3-Hydroxy-5-(2-trifluoroMethylphenyl)pyridine 1261640-32-7 C12H8F3NO
5-cyclobutylpyridin-2(1H)-one 5-cyclobutylpyridin-2(1H)-one 1159818-55-9 C9H11NO
4-Hydroxypiperidine--d9 4-Hydroxypiperidine--d9 1219799-39-9 C5H11NO
4-BroMo-1-(n-propyl)iMidazole 4-BroMo-1-(n-propyl)iMidazole 1353856-52-6 C6H9BrN2
4-Ethylthiazole 4-Ethylthiazole 17626-72-1 C5H7NS
2-[[(3aS,4R,6S,6aR)-4-[7-[[(1R,2S)-2-(3,4-Difluorophenyl)cyclopropyl]amino]-5-(propylthio)-3H-[1,2,3]triazolo[4,5-d]pyrimidin-3-yl]-2,2-dimethyl-tetrahydro-3aH-cyclopenta[d][1,3]dioxol-6-yl]oxy]ethanol 2-[[(3aS,4R,6S,6aR)-4-[7-[[(1R,2S)-2-(3,4-Difluorophenyl)cyclopropyl]amino]-5-(propylthio)-3H-[1,2,3]triazolo[4,5-d]pyrimidin-3-yl]-2,2-dimethyl-tetrahydro-3aH-cyclopenta[d][1,3]dioxol-6-yl]oxy]ethanol 274693-26-4 C26H32F2N6O4S
2-Bromo-5-fluoropyrazine 2-Bromo-5-fluoropyrazine 1209459-10-8 C4H2BrFN2
1,6-Diisopropyl-3,8-dibromopyrene 1,6-Diisopropyl-3,8-dibromopyrene 869340-02-3 C22H20Br2
2,4-Dichloro-6-(4-Methoxyphenyl)pyriMidine 2,4-Dichloro-6-(4-Methoxyphenyl)pyriMidine 163263-91-0 C11H8Cl2N2O
2-Chlorothiophene-3-carbaldehyde 2-Chlorothiophene-3-carbaldehyde 14345-98-3 C5H3ClOS
4-(Pyridin-4-yl)phenol 4-(Pyridin-4-yl)phenol 77409-99-5 C11H9NO
2-Chloro-4-(4-piperidinyl)pyriMidine 2-Chloro-4-(4-piperidinyl)pyriMidine 1001754-79-5 C9H12ClN3
Nilotinib hydrochloride anhydrous Nilotinib hydrochloride anhydrous 923288-95-3 C28H23ClF3N7O
4-Cyclopropylthiazole 4-Cyclopropylthiazole 433217-34-6 C6H7NS
N-Boc-4-(2-broMophenyl)piperidine N-Boc-4-(2-broMophenyl)piperidine 1198283-93-0 C16H22BrNO2
2-acetyl-4-bromothiazole 2-acetyl-4-bromothiazole 208264-53-3 C5H4BrNOS
tert-Butyl 4-Methyl-3-(4,4,5,5-tetraMethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrazole-1-carboxylate tert-Butyl 4-Methyl-3-(4,4,5,5-tetraMethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrazole-1-carboxylate 1402174-62-2 C15H25BN2O4
2-Chloro-3-isopropoxypyridine 2-Chloro-3-isopropoxypyridine 1105190-61-1 C8H10ClNO
2-Pyridinamine, 5-bromo-6-ethyl- 2-Pyridinamine, 5-bromo-6-ethyl- 848360-99-6 C7H9BrN2
2H-Pyran, 2-fluorotetrahydro- 2H-Pyran, 2-fluorotetrahydro- 49624-41-1 C5H9FO
6-(2-chlorophenyl)pyridin-2-amine 6-(2-chlorophenyl)pyridin-2-amine 882014-09-7 C11H9ClN2
5-Acetyl-4-indanol 5-Acetyl-4-indanol 28179-02-4 C11H12O2
3-Methyl-5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrazole 3-Methyl-5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrazole 1888441-67-5 C10H17BN2O2
4-(2-Bromopyrimidin-4-yl)morpholine 4-(2-Bromopyrimidin-4-yl)morpholine 1209459-32-4 C8H10BrN3O
2-Isopropylpyridin-3-amine 2-Isopropylpyridin-3-amine 1369105-90-7 C8H12N2
3-chloro-2-fluoro-4-methylpyridine 3-chloro-2-fluoro-4-methylpyridine 1214377-89-5 C6H5ClFN
3-Bromo-2-(3-chlorophenyl)pyridine 3-Bromo-2-(3-chlorophenyl)pyridine 1417519-07-3 C11H7BrClN
7,8-difluorodibenzo[b,e]thiepin-11(6H)-one 7,8-difluorodibenzo[b,e]thiepin-11(6H)-one 2136287-66-4 C14H8F2OS
tert-butyl 4-(5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridin-2-yl)piperidine-1-carboxylate tert-butyl 4-(5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridin-2-yl)piperidine-1-carboxylate 2223046-23-7 C21H33BN2O4
4-bromo-6-ethylpyrimidine 4-bromo-6-ethylpyrimidine 1086382-07-1 C6H7BrN2
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