heterogeneous l-proline. Excellent yield (96%) with high enantiomeric excess (79% ee) was obtained in the direct aldol reaction of 2-nitrobenzaldehyde with acetone catalyzed by l-proline/GO hybrid, which was comparable to that observed in the reactions promoted by l-proline itself. Furthermore, the l-proline/GO hybrid used as a heterogeneous catalyst could be easily recovered and recycled for seven times
原始升-脯
氨酸是通过在
水溶液中混合它们非共价地装载在所述
石墨烯氧化物(GO)片材以简单的路由。表征的技术以及建议升-脯
氨酸被有效加载在两侧,并通过氢键和/或离子相互作用的GO片材的边缘,赋予优异的升-脯
氨酸/ GO为直接不对称醛醇缩合反应混合催化剂。GO载体独特的多层结构具有足够的层间空间,有利于试剂向l-脯
氨酸手性部分的扩散,因此导致异质l的高催化效率-脯
氨酸。优异的收率(96%)具有高的对映体过量(79%ee值与
丙酮2-硝基
苯甲醛的直接醛醇缩合反应通过催化得到)升-脯
氨酸/ GO混合,这是比得上在由促进反应中观察到升-脯
氨酸本身。此外,升-脯
氨酸/ GO用作非均相催化剂的混合可容易地回收并循环用于七次无反应性的显著损失。