Synthesis of a Novel Chiral Ionic Liquid and Its Application in Enantioselective Aldol Reactions
作者:Wei Zhou、Li-Wen Xu、Hua-Yu Qiu、Guo-Qiao Lai、Chun-Gu Xia、Jian-Xiong Jiang
DOI:10.1002/hlca.200890012
日期:2008.1
A novel chiral ionic liquid, compound 1, based on camphorsulfonic acid, was prepared. A catalytic amount of 1 readily promotes L-proline-catalyzed aldol reactions, with good chemoselectivity, both in H2O and in organic solvents. Further, the aldol reaction of cyclohexanone with 4-nitrobenzaldehyde afforded 2-[hydroxy(4-nitrophenyl)methyl]cyclohexanone (6) in 98% yield with high enantioselectivity (94%
制备了基于樟脑磺酸的新型手性离子液体,化合物1。在H 2 O和有机溶剂中,催化量1都容易促进L-脯氨酸催化的羟醛反应,并具有良好的化学选择性。此外,环己酮与4-硝基苯甲醛的醛醇缩合反应以98%的收率得到2- [羟基(4-硝基苯基)甲基]环己酮(6),当大量的1(5当量)时,具有高的对映选择性(94%ee)。用作启动子。