Catalyst-Free Photoredox Addition-Cyclisations: Exploitation of Natural Synergy between Aryl Acetic Acids and Maleimide
作者:David W. Manley、Andrew Mills、Christopher O'Rourke、Alexandra M. Z. Slawin、John C. Walton
DOI:10.1002/chem.201304929
日期:2014.4.25
Suitably functionalised carboxylic acids undergo a previously unknown photoredox reaction when irradiated with UVA in the presence of maleimide. Maleimide was found to synergistically act as a radical generating photoxidant and as a radical acceptor, negating the need for an extrinsic photoredox catalyst. Modest to excellent yields of the product chromenopyrroledione, thiochromenopyrroledione and
当在马来酰亚胺存在下用 UVA 照射时,适当官能化的羧酸会发生以前未知的光氧化还原反应。发现马来酰亚胺协同作用作为产生自由基的光氧化剂和作为自由基受体,不需要外在的光氧化还原催化剂。在 13 次制备性光解中获得了中等至极好的产率的产物色基吡咯二酮、硫代色基吡咯二酮和吡咯并喹啉二酮衍生物。原位核磁共振光谱用于研究每个反应。监测反应物衰变和产物堆积,从而绘制反应曲线。一种似是而非的机制,即光激发的马来酰亚胺充当氧化剂以产生自由基离子对,已被假设并得到 UV/Vis 的支持。光谱和 DFT 计算。