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A new efficient route to imidazo[4,5-c]pyrazol-5-ones

✍ Scribed by Chiara B. Vicentini; Augusto C. Veronese; Maurizio Manfrini

Publisher
Journal of Heterocyclic Chemistry
Year
1997
Tongue
English
Weight
276 KB
Volume
34
Category
Article
ISSN
0022-152X

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✦ Synopsis

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).

📜 SIMILAR VOLUMES

A novel route to 4-oxy/thio substituted-
A novel route to 4-oxy/thio substituted-1H-pyrazol-5(4H)-ones via efficient cross-Claisen condensation
✍ R. Venkat Ragavan; V. Vijayakumar 📂 Article 📅 2010 🏛 Journal of Heterocyclic Chemistry 🌐 English ⚖ 113 KB

## Abstract α‐Oxy/thio substituted β‐keto esters were synthesized through an efficient cross‐Claisen condensation of oxy/thio substituted acetic acid ethyl esters with acid chlorides, which in turn converted __in situ__ into 4‐oxy/thio substituted‐1__H__‐pyrazol‐5(4__H__)‐ones by the addition of hy