Robust alkyl‐bridged bis(
<i>N</i>
‐heterocyclic carbene)palladium(II) complexes anchored on Merrifield's resin as active catalysts for the selective synthesis of flavones and alkynones
作者:Waseem Mansour、Mohammed Fettouhi、Qasim Saleem、Bassam El Ali
DOI:10.1002/aoc.6195
日期:2021.5
propylene‐bridged bis(N‐heterocyclic carbene)palladium(II) complexes covalently anchored on Merrifield's resin were synthesized and characterized using various physical and spectroscopic techniques. The two anchored Pd(II) complexes consist of the system: Merrifield's resin‐linker‐bis(NHC)Pd(II), the linkers being benzyl and benzyl‐O‐(CH2)3 for (Pd‐NHC1@M) and (Pd‐NHC2@M), respectively. The short linker
使用各种物理和光谱技术合成并表征了共价锚固在Merrifield树脂上的高活性和高效的丙烯桥双(N-杂环卡宾)钯(II)配合物。两个固定的Pd(II)配合物由以下系统组成:Merrifield的树脂-连接基-双(NHC)Pd(II),连接基为(Pd-NHC1 @ M)的苄基和苄基-O-(CH 2)3和(Pd-NHC2 @ M)。短接头锚定的双苯并咪唑配体前体(PBBI-1 @ M)是通过丙烯桥联的双(苯并咪唑)(PBBI-1)的直接碳-氮烷基化反应合成的)由Merrifield's树脂的氯苄基组成。较长的接头锚定双苯并咪唑鎓配体前体(PBBI-2 @ M)是通过两步反应获得的,该过程涉及先将(PBBI-1)与3-氯-1-丙醇进行烷基化,然后在Merrifield的树脂氯苄基上进行亲核取代团体。两种负载的配体前体(PBBI-1 @ M和PBBI-2 @ M)与乙酸钯反应生成两种非均相催化剂(Pd-NHC1