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Fused pyridines by a tandem aza-wittig / heterocyclization strategy: Synthesis of 1,2,4-triazolo[1,5-a]pyridines and pyrido[1,2-b][1,2,4]triazines

✍ Scribed by Magda A. Barsy; Eman A. El Rady; Fawi M. Abd El Latif

Publisher
Journal of Heterocyclic Chemistry
Year
2008
Tongue
English
Weight
410 KB
Volume
45
Category
Article
ISSN
0022-152X

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✦ Synopsis

Abstract

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The iminophosphorane 1‐amino‐6‐(triphenylphosphoranylideneamino)‐2‐oxo‐4‐phenyl‐1,2‐dihydro‐pyridine‐3,5‐dicarbonitrile 2 prepared from 1,6‐diaminopyridine 1 reacts with heterocumulenes such as carbon disulfide and phenylisocyanate, and with acid chlorides, acid anhydrides and haloketones to give directly the title compounds in an one‐pot aza‐Wittig / heterocyclic‐ring closure process with good yields.

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