Regioselectivity of Enzymatic and Photochemical Single Electron Transfer Promoted Carbon−Carbon Bond Fragmentation Reactions of Tetrameric Lignin Model Compounds
作者:Dae Won Cho、John A. Latham、Hea Jung Park、Ung Chan Yoon、Paul Langan、Debra Dunaway-Mariano、Patrick S. Mariano
DOI:10.1021/jo200253v
日期:2011.4.15
lignins, have been prepared and carbon−carbon bond fragmentation reactions of their cation radicals, formed by photochemical (9,10-dicyanoanthracene) and enzymatic (lignin peroxidase) SET-promoted methods, have been explored. The results show that cation radical intermediates generated from the tetrameric model compounds undergo highly regioselective C−C bond cleavage in their β-1 subunits. The outcomes
已经制备了新型的四聚体木质素模型化合物,它们包含天然木质素中常见的β-O-4和β-1结构亚基,并且它们的阳离子自由基通过碳化学反应形成碳-碳键断裂反应(9,10 -diyanoanthracene)和酶促(木质素过氧化物酶)SET促进的方法,已经进行了探索。结果表明,由四聚体模型化合物生成的阳离子自由基中间体在其β-1亚基中具有高度区域选择性的C-C键断裂。这些过程的结果表明,与正电荷和奇数电子分布无关,SET形成的木质素的阳离子自由基与酶中敏化剂或血红素铁中心的激发态通过β-1和β-的键断裂反应选择性降解。 O-4部分。此外,