interactions (Schemes 2 and 3). These supported catalysts were successfully applied to asymmetric DielsAlder reactions in H2O and in CH2Cl2 (Scheme 4). Besides high conversion of the dienophile, we observed enantiomer excesses of up to 88% in H2O and 97% in CH2Cl2, and we were able to recover and re‐use these catalytic systems several times. Despite the relatively high catalyst loading, the leaching of
这三种不同的
全氟烷基-标记的双(二氢
恶唑)
铜络合物19 - 21合成,并通过
氟氟上反相
硅胶(FRPSG)非共价地固定化
氟相互作用(方案2和3)。这些负载的催化剂被成功地应用到不对称狄尔斯阿尔德H中反应2 O和CH中2
氯2(方案4)。除了亲二烯体的高转化率外,我们观察到对映体过量在H 2 O中高达88%,在CH 2 Cl 2中高达97%。,我们能够多次回收和再利用这些催化系统。尽管催化剂的负载量相对较高,但
铜的浸出量却非常低,仅为2.4至5.9 ppm。