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Synthesis of [1,2,4]-triazolo[1,5-a]pyrimidines by Dimroth rearrangement of [1,2,4]-triazolo[4,3-a]pyrimidines: A theoretical and NMR study

✍ Scribed by Antonio Salgado; Carmen Varela; Ana María García Collazo; Fernando García; Paolo Pevarello; Ibon Alkorta; José Elguero

Publisher
Elsevier Science
Year
2011
Tongue
English
Weight
874 KB
Volume
987
Category
Article
ISSN
0022-2860

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📜 SIMILAR VOLUMES

Pyrazolo[3,4-d][1,2,3]triazolo[1,5-a]pyr
Pyrazolo[3,4-d][1,2,3]triazolo[1,5-a]pyrimidine: a new ring system through Dimroth rearrangement
✍ Antonino Lauria; Ilenia Abbate; Chiara Patella; Noemi Gambino; Arturo Silvestri; 📂 Article 📅 2008 🏛 Elsevier Science 🌐 French ⚖ 300 KB

Derivatives of the new ring system pyrazolo [3,4-d][1,2,3]triazolo[1,5-a]pyrimidine were synthesized from the corresponding angular isomers, through a Dimroth rearrangement, in quantitative yields. Preliminary computational studies demonstrated that this class of compounds could be a good candidate

Differentiation between [1,2,4]triazolo[
Differentiation between [1,2,4]triazolo[1,5-a] pyrimidine and [1,2,4]triazolo[4,3-a]- pyrimidine regioisomers by 1H15N HMBC experiments
✍ Antonio Salgado; Carmen Varela; Ana María García Collazo; Paolo Pevarello 📂 Article 📅 2010 🏛 John Wiley and Sons 🌐 English ⚖ 228 KB

## Abstract The condensation of malonoaldehyde derivatives with either a 3‐amino‐[1,2,4]‐triazole or a 3,5‐diamino‐[1,2,4]‐triazole precursor was studied. In agreement with previous reports, two different bicycles, namely, bearing the regioisomeric [1,2,4]triazolo[1,5‐a]pyrimidine (**1**) or[1,2,4]

1,2,4-Triazolo[1,5-a]pyrimidin-3-ium chl
1,2,4-Triazolo[1,5-a]pyrimidin-3-ium chloride
✍ Maldonado, Carmen R. ;Quirós, Miguel ;Salas, Juan M. 📂 Article 📅 2007 🏛 International Union of Crystallography 🌐 English ⚖ 189 KB

The cation of the title molecule, C~5~H~5~N~4~ ^+^·Cl^−^, is strictly planar; it occupies a special position on a mirror plane. The protonation of the heterocycle takes place, as expected, at an N atom of the imidazole ring. This H atom is hydrogen bonded to the chloride anion.