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Palladium-catalyzed chemoselective monoarylation of hydrazides for the synthesis of [1,2,4]triazolo[4,3-a]pyridines.

Organic letters (2010-01-27)
Andreas Reichelt, James R Falsey, Robert M Rzasa, Oliver R Thiel, Michal M Achmatowicz, Robert D Larsen, Dawei Zhang
ABSTRACT

An efficient and convenient method for the synthesis of [1,2,4]triazolo[4,3-a]pyridines was exemplified by the synthesis of 20 analogues bearing a variety of substituents at the 3-position. The methodology involves a palladium-catalyzed addition of hydrazides to 2-chloropyridine, which occurs chemoselectively at the terminal nitrogen atom of the hydrazide, followed by dehydration in acetic acid under microwave irradiation.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
2-Chloropyridine, 99%