Diphenylprolinol Silyl Ether as Catalyst of an Asymmetric, Catalytic, and Direct Michael Reaction of Nitroalkanes with α,β-Unsaturated Aldehydes
作者:Hiroaki Gotoh、Hayato Ishikawa、Yujiro Hayashi
DOI:10.1021/ol702545z
日期:2007.12.1
A catalyticenantioselective direct conjugate addition of nitroalkanes to alpha,beta-unsaturated aldehydes using diphenylprolinolsilylether as an organocatalyst has been developed. Using this methodology as a key step, short syntheses of therapeutically useful compounds have also been accomplished.
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 silylether 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 catalyticsystem exhibited high reactivity in brine without