Effects of Molecular Oxygen, Solvent, and Light on Iridium-Photoredox/Nickel Dual-Catalyzed Cross-Coupling Reactions
作者:Martins S. Oderinde、Adrian Varela-Alvarez、Brian Aquila、Daniel W. Robbins、Jeffrey W. Johannes
DOI:10.1021/acs.joc.5b01193
日期:2015.8.7
with Ni(COD)2 in the same reaction system. O2 is believed to promote rapid reduction of the Ni(II) precatalyst by Ir(II) to Ni(0). In addition to O2, the effects that solvent and light-source have on the dual-catalyzed decarboxylative cross-coupling reactions will be discussed. These findings have enabled us to develop a more robust dual-catalyzed decarboxylative cross-coupling protocol.
为了在铱-光氧化还原和镍双催化的sp 3 -sp 2碳-碳键形成反应中实现可重复性,我们研究了分子氧(O 2),溶剂和光源(CF灯或蓝色LED)的作用)参与各种Ir-光氧化还原介导的转化。当在CF灯辐照下将空气稳定的Ni(II)预催化剂用于DMF中时,发现O 2的存在对于催化剂活化很重要。但是,在同一反应体系中用Ni(COD)2进行催化时,不需要O 2进行催化。认为O 2促进了Ir(II)将Ni(II)预催化剂快速还原为Ni(0)。除了O参照图2,将讨论溶剂和光源对双催化的脱羧交叉偶联反应的影响。这些发现使我们能够开发出更可靠的双催化脱羧交叉偶联方案。