Regioselective, One-Pot Syntheses of Symmetrically and Unsymmetrically Halogenated 2′,6′-Bispyrazolylpyridines
作者:Rajadurai Chandrasekar、Supratim Basak、Pramiti Hui
DOI:10.1055/s-0029-1217077
日期:2009.12
excellent yield (in gram scale). This methodology yielded several symmetrically and asymmetrically substituted mono-, di-, tri-, and tetra-halo (bromo and iodo) substituted 2′,6′-bispyrazolylpyridine cores, which may serve as potential intermediates for several metal-catalyzed coupling reactions. heterocycles - halogenation - halogenated 2,6-bis(pyrazol-1-yl)pyridine - N-ligands - pyridines
通过简单的一锅法中的直接卤化反应制备了一系列区域选择性的3'-,4-,4'-,4''-和5'-卤代杂环2',6'-双吡唑基吡啶衍生物合成效果好至极佳(以克为单位)。该方法产生了几个对称和不对称取代的单,二,三和四卤代(溴和碘)取代的2',6'-双吡唑基吡啶核,它们可作为几种金属催化的偶联反应的潜在中间体。 杂环-卤代-卤代2,6-双(吡唑-1-基)吡啶-N-配体-吡啶