Helical Poly(quinoxaline-2,3-diyl)s Bearing Metal-Binding Sites as Polymer-Based Chiral Ligands for Asymmetric Catalysis
作者:Takeshi Yamamoto、Michinori Suginome
DOI:10.1002/anie.200803719
日期:2009.1.5
Living it up: Helical polyquinoxalines with single and multiple metal‐binding sites, prepared by living polymerization of o‐diisocyanobenzenes, are used in the asymmetric hydrosilylation of styrenes, resulting in comparable enantioselectivities to those obtained by low‐molecular‐weight catalyst systems (up to 87 % ee, stereochemistry was determined by a chiral initiator) and a turnover number of almost
增强活性:通过邻二异氰基苯的活性聚合制备的具有单个和多个金属结合位点的螺旋聚喹喔啉可用于苯乙烯的不对称氢化硅烷化反应,其对映选择性可与低分子量催化剂体系获得的对映选择性相当(到87% ee时,通过手性引发剂测定立体化学),周转数接近1000。