Asymmetric Michael Reaction of Acetaldehyde with Nitroolefins Catalyzed by Highly Water-Compatible Organocatalysts in Aqueous Media
作者:Yupu Qiao、Junpeng He、Bukuo Ni、Allan D. Headley
DOI:10.1002/adsc.201200215
日期:2012.10.8
A novel category of diarylprolinol silyl ether catalysts which contain different lengths of alkylamine tags, was designed and synthesized. These catalysts were used, along with benzoic acid as the co-catalyst, to catalyze the asymmetric Michael reaction of the highly reactive acetaldehyde with nitroolefins. For the reactions studied, this catalytic system exhibited high reactivity in brine without
设计并合成了一种新型的二芳基脯氨醇甲硅烷基醚催化剂,该催化剂包含不同长度的烷基胺标签。这些催化剂与苯甲酸一起用作助催化剂,用于催化高反应性乙醛与硝基烯烃的不对称迈克尔反应。对于所研究的反应,该催化体系在盐水中显示出高反应活性,而没有任何有机溶剂。对于多种硝基苯乙烯,均获得了良好的收率(30-61%)和高的对映选择性(80-97%ee)。