Enantioselective Conjugate Addition of Alkylboranes Catalyzed by a Copper–<i>N</i>-Heterocyclic Carbene Complex
作者:Mika Yoshida、Hirohisa Ohmiya、Masaya Sawamura
DOI:10.1021/ja304481a
日期:2012.7.25
The first catalytic enantioselective conjugate addition of alkylboron compounds has been achieved. Reactions between alkylboranes and imidazol-2-yl α,β-unsaturated ketones proceeded with high enantioselectivity under the influence of a Cu(I) catalyst system, prepared in situ from CuCl, a new chiral imidazolium salt as a precursor for the N-heterocyclic carbene ligand, and PhOK. Alkylboranes are widely
首次实现了烷基硼化合物的催化对映选择性共轭加成。烷基硼烷与咪唑-2-基α,β-不饱和酮之间的反应在Cu(I)催化剂体系的影响下以高对映选择性进行,该催化剂体系由CuCl原位制备,CuCl是一种新的手性咪唑盐作为N-杂环的前体卡宾配体和PhOK。烷基硼烷广泛通过烯烃硼氢化反应获得。烷基硼烷和 α,β-不饱和酮可耐受多种官能团。