Photocatalytic Oxidation of Lignin Model Systems by Merging Visible-Light Photoredox and Palladium Catalysis
作者:Markus D. Kärkäs、Irene Bosque、Bryan S. Matsuura、Corey R. J. Stephenson
DOI:10.1021/acs.orglett.6b02651
日期:2016.10.7
Two-step oxidation/reduction strategies, whereby the first oxidation step is required to “activate” lignin systems for controlled fragmentation reactions, have recently emerged as viable routes toward this goal. Herein we describe a catalytic protocol for oxidation of lignin model systems by combining photoredox and Pd catalysis. The developed dual catalytic protocol allowed the efficient oxidation of lignin
长期以来,木质素增值一直被认为是可再生生产芳香族化合物的可持续解决方案。最近已经出现了两步氧化/还原策略,即第一步氧化需要“激活”木质素系统以进行受控的片段化反应,是实现该目标的可行途径。本文中,我们描述了通过结合光氧化还原和Pd催化作用来氧化木质素模型系统的催化方案。发达的双重催化方案允许木质素模型底物在室温下有效氧化,从而以良好或优异的收率提供氧化产物。