Photoenzymatic Hydrogenation of Heteroaromatic Olefins Using ‘Ene’‐Reductases with Photoredox Catalysts
作者:Yuji Nakano、Michael J. Black、Andrew J. Meichan、Braddock A. Sandoval、Megan M. Chung、Kyle F. Biegasiewicz、Tianyu Zhu、Todd K. Hyster
DOI:10.1002/anie.202003125
日期:2020.6.22
selective catalysts for the asymmetric reduction of activated alkenes. This function is, however, limited to enones, enoates, and nitroalkenes using the native hydride transfer mechanism. Here we demonstrate that EREDs can reduce vinyl pyridines when irradiated with visible light in the presence of a photoredox catalyst. Experimental evidence suggests the reaction proceeds via a radical mechanism where
黄素依赖性“烯”还原酶(ERED)是用于不对称还原活化烯烃的高选择性催化剂。但是,使用天然氢化物转移机制,该功能仅限于烯酮,烯酸酯和硝基烯烃。在这里,我们证明当在光氧化还原催化剂存在下用可见光照射时,EREDs可以还原乙烯基吡啶。实验证据表明,反应是通过自由基机理进行的,其中乙烯基吡啶在溶液中还原为相应的中性苄基。DFT计算显示该自由基是“动态稳定的”,这表明该自由基具有足够长的寿命,可以扩散到酶的活性位点以进行立体选择性氢原子转移。这种减少机制与本地机制不同,