Supported palladium catalysis using a heteroleptic 2-methylthiomethylpyridine–N,S–donor motif for Mizoroki–Heck and Suzuki–Miyaura coupling, including continuous organic monolith in capillary microscale flow-through mode
作者:Roderick C. Jones、Allan J. Canty、Jeremy A. Deverell、Michael G. Gardiner、Rosanne M. Guijt、Thomas Rodemann、Jason A. Smith、Vicki-Anne Tolhurst
DOI:10.1016/j.tet.2009.07.013
日期:2009.9
Flow-through catalysis utilising (2-methylthiomethylpyridine)palladium(II) chloride species covalently attached to a macroporous continuous organic polymer monolith synthesised within fused silica capillaries of internal diameter 250 μm is described, together with related studies of ground bulk monolith compared with supported catalysis on Merrifield and Wang beads and homogeneous catalysis under identical
描述了利用(2-甲基硫代甲基吡啶)氯化钯(II)共价连接到内径250μm的熔融石英毛细管中合成的大孔连续有机聚合物整料的流通催化,以及与支持的催化相比的磨碎整体整料的相关研究。在相同条件下的Merrifield和Wang珠上的均相催化与本体负载催化作用相同。整体基质,聚(氯甲基苯乙烯-co-二乙烯基苯),具有与Merrifield和Wang树脂直接相关的骨架。均相预催化剂PdCl 2(L 2)(L 2= 4-(4-苄氧基苯基)-2-甲基硫代甲基吡啶)在其外围含有苄氧基苯基,作为“ PdCl 2(N〜S)”中心与树脂和整料的聚合物取代基之间的间隔基的模型。Suzuki-Miyaura和Mizoroki-Heck催化在每个体系中均表现出与芳基卤化物试剂变化相关的预期反应趋势,并且表明珠粒和整料上的负载型催化比均相催化的产率更高。介绍了2-甲基硫代甲基吡啶的合成以及4-溴-2-溴甲基吡啶氢溴酸盐