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Fused mesoionic heterocycles : synthesis of 1,3,4-triazolo(3,2-a)pyridine derivatives

✍ Scribed by P. Molina; M. Alajarín; A. Arques; R. Benzal; H. Hernandez


Book ID
104220000
Publisher
Elsevier Science
Year
1983
Tongue
French
Weight
162 KB
Volume
24
Category
Article
ISSN
0040-4039

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✦ Synopsis


A number of mesoionic compounds derivatives of the bicyclic system 1,3,4-triazolo(3,2_a)pyridine have been prepared, and an improved method for the preparation of 1,3,4oxadiazolo(3,2-a)pyridylium-2-aminides from 1,3,4-oxadiazolo(3,2-a)pyridylium-2-olate and iminophosphoranes is described.

Recently we have reported two general methods for the preparation of mesoionic derivatives of 1,3,4-oxadiazolo


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Activated nitriles in heterocyclic synth
✍ Suzan I. Aziz; Zaghloul E. Kandeel; Mona M. Husein; Salem El Gohary; Eiman I. Ab 📂 Article 📅 1995 🏛 John Wiley and Sons 🌐 English ⚖ 311 KB

## Abstract A new route for the synthesis of 3H‐1,2,4‐triazolo[1,5‐a]pyridines 7a–j, 12a,b, and 17a,b utilizing the reaction of the hydrazones of cyanoethanoic acid hydrazide 3a,b with ylidene malononitriles 2a–e, malononitrile, and 3‐aminocrotononitrile is described.