Lewis Acid Promoted Ruthenium(II)-Catalyzed Etherifications by Selective Hydrogenation of Carboxylic Acids/Esters
作者:Yuehui Li、Christoph Topf、Xinjiang Cui、Kathrin Junge、Matthias Beller
DOI:10.1002/anie.201500062
日期:2015.4.20
compounds. In general, the reduction of esters constitutes the most straightforward preparation of ethers. Unfortunately, this transformation requires large amounts of metal hydrides. Presented herein is a bifunctional catalyst system, consisting of Ru/phosphine complex and aluminum triflate, which allows selective synthesis of ethers by hydrogenation of esters or carboxylic acids. Different lactones
醚在有机化学中至关重要,是有价值的香精,香料和多种生物活性化合物的组成部分。通常,酯的还原构成醚的最直接的制备。不幸的是,这种转变需要大量的金属氢化物。本文提出了一种双功能催化剂体系,其由Ru /膦配合物和三氟甲磺酸铝组成,其允许通过酯或羧酸的氢化选择性地合成醚。不同的内酯以良好的产率降低为所需产物。甚至具有挑战性的芳族和脂族酯也被还原为所需的产物。值得注意的是,原位形成的催化剂可以重复使用几次,而不会显着降低活性。