Chromium‐Catalyzed Selective Dimerization/Hydroboration of Allenes to Access Boryl‐Functionalized Skipped (
<i>E</i>
,
<i>Z</i>
)‐Dienes
作者:Yinsong Zhao、Shaozhong Ge
DOI:10.1002/anie.202012344
日期:2021.1.25
dimerization/hydroboration of allenes is developed to access synthetically versatile boryl‐functionalized skipped dienes with a catalyst generated in situ from CrCl2 and a pyridine‐2,6‐diimine ligand mesPDI. A variety of allenes reacted with pinacolborane (HBpin) to afford the corresponding boryl‐functionalized (E,Z)‐1,4‐dienes in high yields and with excellent selectivity. Electron paramagnetic resonance (EPR) spectroscopic
开发了铬催化的异戊二烯二聚/氢硼化反应,以利用由CrCl 2和吡啶-2,6-二亚胺配体mes PDI合成的多用途硼基官能化跳过二烯。多种异戊烯与频哪醇硼烷(HBpin)反应,以高收率和优异的选择性提供相应的经硼基官能化的(E,Z)-1,4-二烯。电子顺磁共振(EPR)光谱研究表明,这种铬催化的反应可能通过氢化铬(I)中间体进行。