allowed us to find an unsupported catalyst that displays high catalytic activity down to 5 or 2 mol % at room temperature with a high level of enantioselectivity also when used with hexanal and 3‐phenylpropanal. In addition, one of the heterogeneous materials was revealed to be highly recyclable for at least eight cycles with no loss in efficiency working at the same levels of activity and enantioselectivity
制备了两种聚
苯乙烯负载的和六种均相的MacMillan
咪唑啉酮催化剂,并测试了四
氟硼酸苯并二
硫基
丙二醇对
丙醛的不对称α-烷基化反应。手性
咪唑烷酮通过N-3原子或苯环与聚
苯乙烯相连,并将其催化活性与未负载前体进行比较。这种比较使我们能够找到一种无载体催化剂,当与
己醛和3-苯基
丙醛一起使用时,该催化剂在室温下显示低至5或2 mol%的高催化活性,并且具有高对映选择性。另外,一种异质材料显示出至少八个循环的高度可回收性,并且在与未支持的对应物相同的活性和对映选择性
水平下,工作效率没有损失。