作者:Raja K. Rit、Hongyi Li、Stephen P. Argent、Katherine M. Wheelhouse、Simon Woodward、Hon Wai Lam
DOI:10.1002/adsc.202300039
日期:——
Chiral dienes are important ligands in asymmetric catalysis but they are less accessible than other commonly used ligands such as chiral bisphosphines. Here, we show that intramolecular [4+2] cycloaddition of a simply attained chiral allenecarboxanilide readily affords pseudoenantiomeric bicyclo[2.2.2]octa-2,5-dienes containing an alkenyl bromide, which can be readily functionalized to give diverse
手性二烯是不对称催化中的重要配体,但与其他常用配体(如手性双膦)相比,它们更难获得。在这里,我们表明简单获得的手性丙二烯甲酰苯胺的分子内 [4+2] 环加成很容易提供含有烯基溴的假对映体双环 [2.2.2]octa-2,5-二烯,它可以很容易地官能化以提供多种手性二烯配体. 合成很简单,很容易在多克尺度上进行。这些配体在九种对映选择性 Rh(I) 催化的 1,4-加成或 1,2-加成反应中表现出高性能。