Enantioselective Synthesis of Tetra-<i>ortho</i>-Substituted Axially Chiral Biaryls through Rhodium-Catalyzed Double [2 + 2 + 2] Cycloaddition
作者:Goushi Nishida、Nanami Suzuki、Keiichi Noguchi、Ken Tanaka
DOI:10.1021/ol0611550
日期:2006.8.1
[reaction: see text] We have established an enantioselective synthesis of both C2 symmetric and unsymmetric tetra-ortho-substituted axially chiral biaryls through rhodium-catalyzed double [2 + 2 + 2] cycloaddition (up to >99% ee). This method serves as an attractive new route to enantioenriched tetra-ortho-substituted axially chiral biaryls in view of the one-step access to substrate diynes and tetraynes
[反应:见正文]我们已经通过铑催化的双[2 + 2 + 2]环加成反应(高达99%ee)建立了C2对称和不对称的四邻位取代的轴向手性联芳基的对映选择性合成。鉴于从容易获得的炔烃开始一步接触底物二炔和四炔,该方法成为制备对映体富集的四邻位取代的轴向手性联芳基的一种有吸引力的新途径。