Secondary stereocontrolling interactions in chiral Brønsted acid catalysis: study of a Petasis–Ferrier-type rearrangement catalyzed by chiral phosphoric acids
作者:Kyohei Kanomata、Yasunori Toda、Yukihiro Shibata、Masahiro Yamanaka、Seiji Tsuzuki、Ilya D. Gridnev、Masahiro Terada
DOI:10.1039/c4sc00611a
日期:——
Chiral phosphoric acids have emerged as promising asymmetric Brønsted acid catalysts that harness hydrogen bonding interactions as key stereocontrolling elements. A new approach to chiral phosphoric acid catalysis through ion-pairing interactions between the anionic conjugate base of the catalyst and a cationic electrophile has recently attracted attention. However, the mechanism of stereocontrol through
手性磷酸已成为有前途的不对称布朗斯台德酸催化剂,它利用氢键相互作用作为关键的立体控制元素。通过催化剂的阴离子共轭碱与阳离子亲电试剂之间的离子对相互作用,一种新的手性磷酸催化方法引起了人们的关注。但是,通过离子对相互作用的立体控制机制仍然难以捉摸。作为研究涉及此类催化反应的立体控制元件的探针反应,我们研究了手性磷酸催化的7元环状乙烯基乙缩醛的Petasis-Ferrier型重排。DFT计算表明,催化剂与底物之间的非经典C–H⋯O氢键在确定立体选择性方面起着重要作用。此外,