Asymmetric γ-Allylation of α,β-Unsaturated Aldehydes by Combined Organocatalysis and Transition-Metal Catalysis
作者:Line Naesborg、Kim Søholm Halskov、Fernando Tur、Sofie M. N. Mønsted、Karl Anker Jørgensen
DOI:10.1002/anie.201504749
日期:2015.8.24
The first asymmetric regio‐ and diastereodivergent γ‐allylation of cyclic α,β‐unsaturated aldehydes based on combined organocatalysis and transition‐metal catalysis is disclosed. By combining an aminocatalyst with an iridium catalyst, both diastereomers of branched allylated products can be achieved in moderate to good yields and excellent regio‐ and stereoselectivities. Furthermore, by replacing the
公开了基于有机催化和过渡金属催化的环状α,β-不饱和醛的第一个不对称的区域和非对映异构的γ-烯丙基化反应。通过将氨基催化剂与铱催化剂结合使用,可以实现中等至良好的收率以及出色的区域和立体选择性,从而实现支链烯丙基化产物的两种非对映异构体。此外,通过用钯催化剂代替铱催化剂,可以以高收率和优异的区域选择性和对映选择性形成线性烯丙基化产物。因此,通过选择有机催化剂,过渡金属催化剂和配体的适当组合,开发出的方法可以以不同的方式选择性地进入γ-烯丙基化产物的所有六个异构体。