## Abstract The synthesis of imidazo[4,5‐__c__]pyrazol‐5‐ones (6) is reported. 5‐Amino‐4‐ethoxycarbonylaminopyra‐zoles 3a‐g when heated at 200° for 2 hours afford 6a‐g. In a similar manner imidazo[4,5‐__c__]pyrazol‐5‐one (6a) is readily obtained from 4‐amino‐5‐ethoxycarbonylaminopyrazole (5a).
A new route to the synthesis of imidazo [4,5-c]pyrazoles
✍ Scribed by Chiara Beatrice Vicentini; Augusto Cesare Veronese; Paolo Giori; Mario Guarneri
- Publisher
- Elsevier Science
- Year
- 1988
- Tongue
- French
- Weight
- 100 KB
- Volume
- 29
- Category
- Article
- ISSN
- 0040-4039
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## 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 “Full Text” option. The original article is trackable v
A new route to the synthesis of pyrazole and pyrimidine C-nucleosides, which involves as the key step a metal promoted reaction of ~-D-ribofuranosyl ketoesters with alkyl cyanoformates is described. 2,3,5-Tri-O-benzoyl-~-D-ribofuranosyl cyanide I reacts with ct-bromoesters, in the presence of zinc d