A cheap metal catalyzed ring expansion/cross-coupling cascade: a new route to functionalized medium-sized and macrolactones
作者:Shuai Liu、Pengchen Ma、Lu Zhang、Shenyu Shen、Hong-Jie Miao、Le Liu、K. N. Houk、Xin-Hua Duan、Li-Na Guo
DOI:10.1039/d2sc06157k
日期:——
An efficient alkoxyl radical-triggered ring expansion/cross-coupling cascade was developed under cheap metal catalysis. Through the metal-catalyzed radical relay strategy, a wide range of medium-sized lactones (9–11 membered) and macrolactones (12, 13, 15, 18, and 19-membered) were constructed in moderate to good yields, along with diverse functional groups including CN, N3, SCN, and X groups installed
在廉价金属催化下开发了一种有效的烷氧基自由基触发的扩环/交叉偶联级联。通过金属催化的自由基中继策略,以中等至良好的产率构建了各种中型内酯(9-11元)和大环内酯(12、13、15、18和19元),以及多种同时安装的功能组包括CN、N 3、SCN和X组。密度泛函理论(DFT)计算表明,环烷基-Cu(III)物质的还原消除是交叉偶联步骤更有利的反应途径。基于实验和DFT的结果,提出了用于该串联反应的Cu( I )/Cu( II )/Cu( III )催化循环。