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Synthesis of 1,2,4-Triazolo[4,3-a]pyridines and Related Heterocycles by Sequential Condensation and Iodine-Mediated Oxidative Cyclization. 2016
College of Chemistry and Molecular Engineering, Zhengzhou University, Zhengzhou, 450001, P.R. China.
A facile and efficient approach to access 1,2,4-triazolo[4,3-a]pyridines and related heterocycles has been accomplished through condensation of readily available aryl hydrazines with corresponding aldehydes followed by iodine-mediated oxidative cyclization. This transition-metal-free synthetic process is broadly applicable to a variety of aromatic, aliphatic, and α,β-unsaturated aldehydes, and can be conveniently conducted on the gram scale.
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