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1,3-Diphenyl-1 H -pyrazolo[3,4- b ]quinoline: A Versatile Fluorophore for the Design of Brightly Emissive Molecular Sensors

✍ Scribed by Rurack, Knut; Danel, Andrzej; Rotkiewicz, Krystyna; Grabka, Danuta; Spieles, Monika; Rettig, Wolfgang

Book ID
120283675
Publisher
American Chemical Society
Year
2002
Tongue
English
Weight
72 KB
Volume
4
Category
Article
ISSN
1523-7060

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## Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.

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FriedlΓ€nder condensation of 5-aminopyrazole-4-carbaldehydes 1 with formamide 2a or benzamide 2b gave pyrazolo [3,4-d]pyrimidine derivatives 3. Cyclocondensation of 1 with cyclopentanone, N-benzyl-4piperidone and 6-methoxy-1-tetralone yielded cyclopenta[b]pyrazolo[4,3-e]pyridines 4, pyrazolo[3,4-b]-[

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m. p.=248-250GC (dec.; from methanol); [.ID= -129.' (DMSO, c = 1.00); 'H-NMR (D6-DMSO); t=4.13 and 4.18 (s, I-H+l'-H and s, 2 2-benzyl-H, or vice versa); MS: 520 (M+)]. The amino ketone ( 8 ) is probably first formed, being later aromatized by dimerization and air oxidation to yield ( 9 ) . The firs