Role of Adamantane Amide Based on L-Proline Double-H Potential Organocatalyst in Aldol Reaction with Product Separated via Host-guest Interaction
Rui Wang , Zhonglin Wei , Jing Guo , Yusha Feng , Enjie Xu , Haifeng Duan , Yingjie Lin , Qingbiao Yang , Jianshi Du , Yaoxian Li
Chemical Research in Chinese Universities ›› 2018, Vol. 34 ›› Issue (2) : 180 -185.
Role of Adamantane Amide Based on L-Proline Double-H Potential Organocatalyst in Aldol Reaction with Product Separated via Host-guest Interaction
Chiral organocatalysts of 4-adamantane amide based on L-proline with double hydrogen potential were synthesized and used in asymmetric aldol reactions. The reactions were evaluated in toluene under‒20 °C. A series of aldol products was obtained from moderate to good yields(up to 98%) with excellent diastereoselectivities(up to >99:1) and enantioselectivities(up to >99%). The aldol products in the system were separated by α-cyclodextrin via host-guest interaction and determined by chiral HPLC. The catalyst could be reused up to five times. The 4-substitution position played an important role in diastereoselectivity and enantioselectivity.
Prolinamide / Double hydrogen / Aldol reaction / Recycle / Cyclodextrin
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