Heterocyclic Compounds
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ChemInform Abstract: Heterocyclization of Acetamidrazones. Part 1. Synthesis of 1,2,4- Triazolo(4,3-a)pyridines via Ring Closure of 6-(2-Acylhydrazino) pyridine Intermediates.
First published: October 1, 1991
Abstract
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ChemInform Abstract
Following a new procedure, the amidrazones (II) or (V) react with the cyanoacetate (I) in boiling DMSO to give the cyclized products (III) or (VI), whereas in ethanolic solution the pyridines (IV) or (VII) are obtained. Thermal ring closure of the latter likewise leads to the resp. triazolopyridines.
