三唑并吡啶是一类重要的生物活性杂环化合物。在这封信中,我们描述了一种从2-肼基吡啶和羧酸开始合成[1,2,4]三唑并[4,3- a ]吡啶的新方法。使用Lawesson试剂在关键步骤中将生成的乙酰肼进行环化。探索了反应条件以及该反应的范围,涉及三唑并吡啶环的3位上的取代基。我们还证明,在杂环的α位上存在手性碳时,这种杂环化是无消旋作用的。
1,1′-Carbonyldiimidazole (CDI) Mediated Coupling and Cyclization To Generate [1,2,4]Triazolo[4,3-<i>a</i>]pyridines
作者:Kyle D. Baucom、Siân C. Jones、Scott W. Roberts
DOI:10.1021/acs.orglett.5b03589
日期:2016.2.5
An operationally efficient CDI mediated tandem coupling and cyclization reaction to generate [1,2,4]triazolo[4,3-a]pyridines has been reported. The reaction conditions and scope were investigated, and the methodology was demonstrated in batch mode as well as in a continuous process.
已经报道了可操作有效的CDI介导的串联偶联和环化反应以生成[1,2,4]三唑并[4,3- a ]吡啶。研究了反应条件和范围,并以分批方式以及连续过程证明了该方法。
A simple and efficient automatable one step synthesis of triazolopyridines from carboxylic acids
作者:Ying Wang、Kathy Sarris、Daryl R. Sauer、Stevan W. Djuric
DOI:10.1016/j.tetlet.2007.02.004
日期:2007.3
Triazolopyridines can be rapidly and efficiently synthesized from a variety of carboxylic acids with 2-hydrazinopyridines in one simple step. The use of commercially available PS-PPh3 resin combined with microwave heating delivered the product triazolopyridines in good yields and purities.