Enantioselective Addition of Silicon Nucleophiles to Aldimines Using a Preformed NHC-Copper(I) Complex as the Catalyst
作者:Alexander Hensel、Kazuhiko Nagura、Lukas B. Delvos、Martin Oestreich
DOI:10.1002/anie.201402086
日期:2014.5.5
asymmetric addition of silicon nucleophiles to typical prochiral acceptors, the enantioselective 1,2‐addition to aldimines, is addressed. Activation of the SiB bond in the silicon pronucleophile by a copper(I) alkoxide with McQuade’s chiral six‐membered N‐heterocyclic carbene as a supporting ligand releases the silicon nucleophile, which adds to various aldimines with high levels of enantioselectivity. The
解决了将硅亲核试剂不对称添加到典型的手性受体中的另一个主要挑战,即对醛亚胺的对映选择性1,2-加成。在Si的活化在硅pronucleophile乙键通过与麦奎德的手性六元N-杂环卡宾作为支撑配体释放硅亲核体,这增加了具有高水平的对映选择性的各种醛亚胺铜(I)醇盐。新方法提供了催化不对称地接触α-甲硅烷基化胺的方法。