Highly Enantioselective Michael Additions in Water Catalyzed by a PS-Supported Pyrrolidine
作者:Esther Alza、Xacobe C. Cambeiro、Ciril Jimeno、Miquel A. Pericàs
DOI:10.1021/ol071366k
日期:2007.9.1
organocatalyst for the Michael addition of ketones to nitroolefins is described. A 1,2,3-triazole ring, constructed through a click 1,3-cycloaddition, plays the double role of grafting the chiral pyrrolidine monomer onto the polystyrene backbone and of providing a structural element, complementary to pyrrolidine, key to high catalytic activity and enantioselectivity. Optimal operation in water and full recyclability
描述了用于酮向硝基烯烃的迈克尔加成的高效,聚合物负载的有机催化剂的开发。通过单击1,3-环加成反应构建的1,2,3-三唑环起着将手性吡咯烷单体接枝到聚苯乙烯骨架上并提供与吡咯烷互补的结构元素的双重作用,这是高催化活性的关键和对映选择性。在水中的最佳操作和充分的可循环利用性使三唑连接基对固定化有机催化剂具有吸引力。