Formation of Quaternary Stereogenic Centers by NHC-Cu-Catalyzed Asymmetric Conjugate Addition Reactions with Grignard Reagents on Polyconjugated Cyclic Enones
作者:Matthieu Tissot、Daniele Poggiali、Hélène Hénon、Daniel Müller、Laure Guénée、Marc Mauduit、Alexandre Alexakis
DOI:10.1002/chem.201200502
日期:2012.7.9
The copper‐catalyzed conjugate addition of various Grignard reagents to polyconjugated enones (dienone and enynone derivatives) is reported. The catalyst system, composed of copper triflate and an NHC ligand, led to the unusual selective formation of the 1,4‐addition products. This reaction allows for the creation of all‐carbon chiral quaternary centers with enantiomeric excesses up to 99 %. The remaining
据报道,各种格氏试剂在铜催化下将共轭加成物加到共轭烯酮(二烯酮和烯酮衍生物)上。由三氟甲磺酸铜和NHC配体组成的催化剂体系导致1,4加成产物的异常选择性形成。该反应可以创建对映异构体过量高达99%的全碳手性四元中心。1,4加合物上剩余的不饱和基团使您可以进行有价值的合成转化。