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Synthesis and tautomerization of 6,7-dihydro-(1,2,3)-triazolo[1,5-a]pyrimidines

✍ Scribed by Sergey M. Desenko; Evgeny S. Gladkov; Svetlana V. Shishkina; Oleg V. Shishkin; Sergey A. Komykhov; Valery D. Orlov; Herbert Meier

Publisher
Journal of Heterocyclic Chemistry
Year
2006
Tongue
English
Weight
327 KB
Volume
43
Category
Article
ISSN
0022-152X

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✦ Synopsis

Abstract

magnified image

The condensation of 5‐amino‐4‐phenyl‐1,2,3‐triazole (1) with chalcones 2a‐e or 3‐dimethylamino‐propiophenone (4f) leads to the 6,7‐dihydro‐(1,2,3)‐triazolo[1,5‐a]pyrimidines 3a‐f. The equilibrium of 3 and the tautomeric 4,7‐dihydro‐(1,2,3)‐triazolo[1,5‐a]pyrimidines 3′ is described.

📜 SIMILAR VOLUMES

Addition of hydrazine to 4,7-dihydro[1,2
Addition of hydrazine to 4,7-dihydro[1,2,4]triazolo[1,5-a]pyrimidines: Hydrazine derivatives of 4,5,6,7-tetrahydro[1,2,4]triazolo[1,5-a]pyrimidine
✍ Sergey A. Komykhov; Konstantin S. Ostras; Kyryl M. Kobzar; Vladimir I. Musatov; 📂 Article 📅 2009 🏛 Journal of Heterocyclic Chemistry 🌐 English ⚖ 63 KB

## Abstract magnified image The 7‐aryl‐4,7‐dihydro[1,2,4]triazolo[1,5‐__a__]pyrimidines **1a**, **1b**, **1c** can undergo addition of hydrazine to the enamine double bond leading to hydrazine derivatives of tetrahydrotriazolopyrimidines **2a**, **2b**, **2c**; the process is usually accompanied by