T3P-Mediated N–N Cyclization for the Synthesis of 1,2,4-Triazolo[1,5-<i>a</i>]pyridines
作者:Rajaram Ayothiraman、Durgarao Bandaru、Ranjitha Paranthaman、Michaël Fenster、Martin D. Eastgate、Rajappa Vaidyanathan
DOI:10.1021/acs.oprd.9b00396
日期:2019.11.15
Propylphosphonic anhydride has been shown to be an effective reagent for the synthesis of substituted [1,2,4]triazolo[1,5-a]pyridines from the corresponding N′-hydroxy-N-formimidamides. The reactions worked under mild conditions and exhibited wide functional group tolerance, delivering the triazolopyridines in good to excellent yields and purities.
丙基膦酸酐已被证明是从相应的N'-羟基-N-甲酰胺基化合物合成取代的[1,2,4]三唑并[1,5- a ]吡啶的有效试剂。反应在温和的条件下进行,并表现出宽泛的官能团耐受性,从而以优异的产率和纯度提供了三唑并吡啶。