Impregnated Copper(II) Oxide on Magnetite as Catalyst for the Synthesis of Benzo[<i>b</i>
]furans from 2-Hydroxyarylcarbonyl Derivatives and Alkynes
作者:Juana M. Pérez、Diego J. Ramón
DOI:10.1002/ejoc.201600671
日期:2016.9
o-hydroxybenzaldehydes with alkynes in the presence of 4-methylbenzenesulfonohydrazide was carried out in ethanol as a nontoxic biorenewable solvent and in the presence of impregnated copper(II) oxide on magnetite as a heterogeneous catalyst. The catalyst can be easily removed from the reaction medium by a simple magnetic decantation, and the reaction can be performed with a very low copper loading. The in situ
邻羟基苯甲醛与炔烃在 4-甲基苯磺酰肼存在下的偶联-烯丙基化-环化反应序列在乙醇中进行,乙醇作为无毒的生物可再生溶剂,并在磁铁矿上浸渍的氧化铜(II)作为多相催化剂存在。通过简单的磁倾析可以很容易地从反应介质中去除催化剂,并且反应可以在非常低的铜负载下进行。起始的氧化铜 (II) 纳米粒子原位还原成铜 (0) 片材使得催化剂的可回收性变得不可能。该反应的多功能性通过使用不同的邻羟基苯乙酮得到 2,3-二取代的苯并 [b] 呋喃来证明。该反应可以在克规模上进行而没有任何并发症。