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Purines, pyrimidines, and condensed systems based on them. 9. Concerning the synthesis of 1-r-pyrazolo[3,4-d]pyrimidine-4,6-diones

✍ Scribed by L. P. Smirnova; A. F. Pozharskii; I. A. Ivanova; A. I. Chernyshev

Publisher
Springer US
Year
1992
Tongue
English
Weight
477 KB
Volume
28
Category
Article
ISSN
0009-3122

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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]-[