Visible Light Catalysis Assisted Site-Specific Functionalization of Amino Acid Derivatives by C–H Bond Activation without Oxidant: Cross-Coupling Hydrogen Evolution Reaction
作者:Xue-Wang Gao、Qing-Yuan Meng、Jia-Xin Li、Jian-Ji Zhong、Tao Lei、Xu-Bing Li、Chen-Ho Tung、Li-Zhu Wu
DOI:10.1021/acscatal.5b00093
日期:2015.4.3
hydrogen (H2) in good to excellent yields under visible light irradiation. A mechanistic study reveals that the cascade electron transfer processes from glycine ester to the photoexcited Ru(bpy)3(PF6)2 and then to Co(dmgH)2pyCl catalyst, together with the capture of protons delivered by substrates, are crucial for the cross-coupling hydrogen evolution reaction of secondary amines in organic solvents.
描述了通过C–H键功能化而无需使用任何氧化剂或碱的可见光催化辅助α-氨基酸的位点特异性修饰。分别使用Ru(bpy)3(PF 6)2和Co(dmgH )2 pyCl作为光敏剂和催化剂,可以将各种甘氨酸酯与β-酮酯或吲哚衍生物定量地转化为所需的交叉偶联在可见光照射下,产物和氢气(H 2)的收率好至极好。机理研究表明,从甘氨酸酯到光激发的Ru(bpy)3(PF 6)2然后到Co(dmgH)2的级联电子转移过程pyCl催化剂,以及底物传递的质子的捕获,对于仲胺在有机溶剂中的交叉析氢反应至关重要。