The asymmetric transfer hydrogenation of α,β-unsaturated aldehyde with Hantzsch ester catalyzed by polymer-supported chiral pyrrolidine organocatalyst was achieved. The effects of the pyrrolidine substituents and linkage configuration on the catalytic performance were examined in detail. We found that the polymer-supported cis-type chiral pyrrolidine organocatalysts showed high enantioselectivities (up to 99.9%) compared with the corresponding trans analogs and monomers in the reaction. The recovered catalyst was reused without any loss of the catalytic activity.

中文翻译：

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使用聚合物负载的手性吡咯烷催化剂对（E）-2- [1,2,6,7-四氢-8H-茚并[5,4-b]呋喃-8-亚烷基]乙醛进行不对称转移氢化

聚合物负载的手性吡咯烷有机催化剂催化了α，β-不饱和醛与Hantzsch酯的不对称转移加氢反应。详细检查了吡咯烷取代基和连接构型对催化性能的影响。我们发现与反应中相应的反式类似物和单体相比，聚合物负载的顺式手性吡咯烷有机催化剂显示出高对映选择性（高达99.9％）。回收的催化剂可以重复使用而不会损失任何催化活性。