Copper-Catalyzed Asymmetric Conjugate Addition of Alkenyl- and Alkylalanes to α,β-Unsaturated Lactams
作者:Pierre Cottet、Daniel Müller、Alexandre Alexakis
DOI:10.1021/ol303505k
日期:2013.2.15
lactams via a copper-catalyzed asymmetric 1,4-addition of the corresponding alanes. Moderate to good yields and good to excellent enantioselectivities are achieved by using a combination of the very cheap copper(II) naphthenate and a readily available phosphine amine ligand. The creation of an all-carbon quaternary stereogenic center, via Michael addition to a trisubstituted conjugated lactam, is also
烯基和烷基已通过铜催化的相应丙氨酸的不对称1,4-加成反应成功地引入到六元α,β-不饱和内酰胺中。通过使用非常便宜的环烷酸铜(II)和易于获得的膦胺配体的组合,可以实现中等至良好的收率和良好至出色的对映选择性。还首次公开了通过将迈克尔加成到三取代的共轭内酰胺上来创建全碳四元立体异构中心。