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Condensed heterocycles are heterocyclic rings that are fused with other rings, either carbocyclic or heterocyclic. For example, thiazole when fused with pyridine affords thiazolopyridine isomers. Likewise, two or more different heterocyclic compounds having varying hetero atoms can combine together to form a condensed heterocyclic compound. The examples include pyrazolo-pyrimidines, thiazoloquinolines, and imidazopyridazines.

The condensed heterocycles have wide ranging applications. They are present as core in a variety of compounds, particularly in life saving drug molecules. For example they are useful as drugs for treating Parkinson's disease and restless legs syndrome, as atypical antipsychotics to treat schizophrenia, bipolar disorder, and irritability in people with autism, and as antiplatelet agents that inhibit blood clots in coronary artery disease, peripheral vascular disease, cerebrovascular disease, and to prevent myocardial infarctions. Furthermore, the anti-infective drugs like cephalosporins, penicillins, and carbapenems are additional examples of condensed heterocycles. Condensed heterocycles like EDOT (3,4-ethylene-dioxythiophene) are used for the preparation of conducting polymers for use in LCD and solar cells.

  • 1-(2-Methoxyethyl)-4-oxo-1,4-dihydropyrido[1,2-a]pyrrolo[2,3-d]pyrimidine-2-carboxylic acid monohydrate, 96%
  • 1,3-Dimethyl-2,4-dioxo-2,3,4,7-tetrahydropyrrolo[2,3-d]pyrimidine-6-carboxylic acid monohydrate, 96%
  • 1,3-Dimethyl-2,4-dioxo-7-n-propyl-2,3,4,7-tetrahydropyrrolo[2,3-d]pyrimidine-6-carboxylic acid, 96%
  • 1-(3-Methoxypropyl)-4-oxo-1,4-dihydropyrido[1,2-a]pyrrolo[2,3-d]pyrimidine-2-carboxylic acid, 96%
  • 1-n-Butyl-4-oxo-1,4-dihydropyrido[1,2-a]pyrrolo[2,3-d]pyrimidine-2-carboxylic acid, 96%
  • 2,6-Dichloro-7-deazapurine, 98+%
  • 2-Amino-4-chloro-7H-pyrrolo[2,3-d]pyrimidine, 97%
  • 2-Mercapto-3-phenyl-5,6,7,8-tetrahydrobenzo[b]thieno[2,3-d]pyrimidin-4(3H)-one, 96%
  • 2-Mercapto-7-methyl-3-phenyl-5,6,7,8-tetrahydrobenzo[b]thieno[2,3-d]pyrimidin-4(3H)-one, 96%
  • 2-Methyl-3,4,5,6,7,8-hexahydrobenzo[4,5]thieno[2,3-d]pyrimidine-4-thione, 96%
  • 2-Methylnaphtho[1,2-d]thiazole, 98%
  • 2-Trifluoromethyl-5,6,7,8-tetrahydroimidazo[1,2-a]pyrazine hydrochloride, 97%
  • 3,3'-Diethylthiatricarbocyanine perchlorate, 96%
  • 3,5,6,7-Tetrahydro-4H-cyclopenta[b]thieno[2,3-d]pyrimidin-4-one, 96%
  • 3,5-Diphenyl-2-thioxo-2,3-dihydrothieno[2,3-d]pyrimidin-4(1H)-one, 96%
  • 3-Allyl-2-mercapto-3,4,5,6,7,8-hexahydrobenzo[4,5]thieno[2,3-b]pyrimidin-4-one, 96%
  • 3-Allyl-2-mercapto-3,5,6,7-tetrahydro-4H-cyclopenta[4,5]thieno[2,3-d]pyrimidin-4-one, 96%
  • 3-Allyl-5,6-dimethyl-2-thioxo-2,3-dihydrothieno[2,3-d]pyrimidin-4(1H)-one, 96%
  • 3-Allyl-7-methyl-2-mercapto-5,6,7,8-tetrahydro[1]benzothieno[2,3-d]pyrimidin-4(3H)-one, 96%
  • (3R-cis)-Tetrahydro-3-trichloromethyl-1H,3H-pyrrolo[1,2-c]oxazol-1-one, 98%
  • 3-(Trifluoromethyl)-5,6,7,8-tetrahydro-1,2,4-triazolo[4,3-a]pyrazine hydrochloride, 98+%
  • 4-Chloro-2,7-dimethyl-5,6,7,8-tetrahydrobenzo[b]thieno[2,3-d]pyrimidine, 96%
  • 4-Chloro-2-ethyl-5,6,7,8-tetrahydrobenzo[b]thieno[2,3-d]pyrimidine, 96%
  • 4-Chloro-2-methyl-5,6,7,8-tetrahydrobenzo[b]thieno[2,3-d]pyrimidine, 96%
  • 4-Chloro-5-(2-thienyl)thieno[2,3-d]pyrimidine, 97%
  • 4-Chloro-5-(4-methoxyphenyl)thieno[2,3-d]pyrimidine, 96%
  • 4-Chloro-5,6,7,8-tetrahydro-1-benzothieno[2,3-d]pyrimidine, 96%
  • 4-Chloro-5-phenylthieno[2,3-d]pyrimidine, 98%
  • 4-Chloro-6,7,8,9-tetrahydro-5H-cyclohepta-4,5-thieno[2,3-d]pyrimidine, 96%
  • 4-Chloro-6,7-dihydro-5H-cyclopenta[4,5]thieno[2,3-d]pyrimidine, 96%
  • 4-Chloro-7-methyl-5,6,7,8-tetrahydrobenzo[b]thieno[2,3-d]pyrimidine, 96%
  • 4-Hydrazino-5,6,7,8-tetrahydrobenzo[b]thieno[2,3-d]pyrimidine hemihydrate, 95%
  • 4-Methyl-1,2,4-triazolo[4,3-a]quinoline-1-thiol, 96%
  • 4-Oxo-1-propyl-1,4-dihydropyrido[1,2-a]pyrrolo[2,3-d]pyrimidine-2-carboxylic acid, 96%
  • 5-(4-Chlorophenyl)thiazolo[2,3-c]-1,2,4-triazole-3-thiol, 96%
  • 5-(4-Methylphenyl)thiazolo[2,3-c]-1,2,4-triazole-3-thiol, 96%
  • 5,6,7,8,9,10-Hexahydrocyclohept[b]indole, 98%
  • 5,6-Dimethyl-3-phenyl-2-thioxo-2,3-dihydrothieno[2,3-d]pyrimidin-4(1H)-one, 96%
  • 5,6-Dimethylthieno[2,3-d]pyrimidine-4(3H)-thione, 96%
  • 5,7-Dihydroindolo[2,3-b]carbazole, 96%
  • 6,7,8,9,10,11-Hexahydrocyclooct[b]indole, 97%
  • 6,7-Dihydro-5H-cyclopenta-4,5-thieno[2,3-d]pyrimidine-4-thiol, 96%
  • 6,7-Dihydrocyclopenta[4,5]pyrrolo[3,2-b]pyridin-8(5H)-one, 98%
  • 6-Amino-7-(5-indolinyl)-9-methyl-7-deazapurine, 95%
  • 6-Amino-7-bromo-9-methyl-7-deazapurine, 97%
  • 6-Amino-7-deazapurine, 97%
  • 6-Amino-7-deazapurine hydrogen sulfate, 97%
  • 6-Chloro-7-deazapurine, 98%
  • 6-Chloro-7-iodo-7-deazapurine, 96%
  • 7-(2-Methoxyethyl)-1,3-dimethyl-2,4-dioxo-2,3,4,7-tetrahydro-1H-pyrrolo[2,3-d]pyrimidine-6-carboxylic acid, 96%

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