## 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.
A new ring transformation of pyrazolo[4,3-d]pyrimidines to pyrimido[5,4-d]pyrimidines
โ Scribed by Shigeo Senda; Kosaku Hirota; Tetsuji Asao; Yoshihiro Yamada
- Publisher
- Elsevier Science
- Year
- 1978
- Tongue
- French
- Weight
- 103 KB
- Volume
- 19
- Category
- Article
- ISSN
- 0040-4039
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๐ SIMILAR VOLUMES
The synthesis and physiological activity of some novel 4-substituted triazolo [4,5-d]pyrimidines and 4-substituted pyrazolo [3,4-d]pyrimidines are described. Most of the compounds possessed high anticytokinin activity towards purine (benzyladenine) and phenylurea (4-PU-30) type cytokinins. 1-Benzyl-
## Abstract Pyrazoloโ[3,4โ__d__]pyrimidineโ4,6โdiones **5** and pyrazolo[4,3โ__d__]pyrimidineโ5,7โdiones **7** were synthesized by Curtius rearrangement of pyrazolic monoโesters **2** and **3** followed by heteroโcyclization __via__ the ureas derivatives **4** and **6** under alkaline conditions.
## Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a โFull Textโ option. The original article is trackable v