A Chiral Bis-Sulfoxide Ligand in Late-Transition Metal Catalysis; Rhodium-Catalyzed Asymmetric Addition of Arylboronic Acids to Electron-Deficient Olefins
作者:Ronaldo Mariz、Xinjun Luan、Michele Gatti、Anthony Linden、Reto Dorta
DOI:10.1021/ja710665q
日期:2008.2.1
A bis-sulfoxide with a binaphthyl backbone is introduced as a readily available, chiral ligand entity in late-transition metal catalysis. Ligand p-tol-BINASO [where p-tol-BINASO is 1,1‘-binaphthalene-2,2‘-diyl-bis-(p-tolylsulfoxide)] is obtained in pure form in one single synthetic step from relatively cheap, commercially available starting materials. Precatalyst [(P,R,R)-p-tol-BINASO}RhCl]2 was synthesized
具有联萘骨架的双亚砜作为后过渡金属催化中容易获得的手性配体实体被引入。配体 p-tol-BINASO [其中 p-tol-BINASO 是 1,1'-联萘-2,2'-二基-双-(对甲苯基亚砜)] 在一个单一合成步骤中以纯形式从相对便宜的、市售原料。前催化剂 [(P,R,R)-p-tol-BINASO}RhCl]2 以高产率合成,并通过 X 射线衍射进行结构表征,并将结构数据与游离配体进行比较。该预催化剂在芳基硼酸与环状 α,β-不饱和酮和酯的不对称 1,4-加成反应中显示出优异的反应性和选择性。