Efficient Synthesis of 3-Substituted 1,2,4-Triazolo[4,3-a]pyridine by [Bis(Trifluroacetoxy)iodo]benzene-Catalyzed Oxidative Intramolecular Cyclization of Heterocyclic Hydrazones
作者:Vikas S. Padalkar、Vikas S. Patil、Kiran R. Phatangare、Prashant G. Umape、N. Sekar
DOI:10.1080/00397911003707162
日期:2011.2.28
Abstract A series of 1,2,4-triazolopyridines have been prepared by oxidative intramolecular cyclization of heterocyclic hydrazones with [bis(trifluroacetoxy)iodo]benzene. General applicability of this simple transformation was confirmed by synthesis of 1,2,4-triazolo[4,3-a]pyridine. The advantages of this protocol are the nontoxicity of catalyst and shorter reaction time to obtain good preparative
摘要 通过杂环腙与[双(三氟乙酰氧基)碘]苯的分子内氧化环化反应制备了一系列1,2,4-三唑并吡啶。通过 1,2,4-三唑并 [4,3-a] 吡啶的合成证实了这种简单转化的普遍适用性。该协议的优点是催化剂的无毒和较短的反应时间,以获得良好的制备收率。