Enantioselective organocatalytic Michael addition of malonates to α,β-unsaturated aldehydes in water
作者:Anqi Ma、Shaolin Zhu、Dawei Ma
DOI:10.1016/j.tetlet.2008.03.051
日期:2008.5
The Michaeladdition of malonates to α,β-unsaturated aldehydes catalyzed by O-TMS protected diphenylprolinols and acetic acid in water occurs at 0 °C to rt. In most cases, the reaction runs to completion in less than 24 h. A wide range of aldehydes including β-aryl, β-alkyl and β-alkenyl acroleins are found to be compatible with these conditions, providing the corresponding adducts in good yields and
A Recyclable Chiral 2‐(Triphenylmethyl)pyrrolidine Organocatalyst Anchored to [60]Fullerene
作者:Cristian Rosso、Marco G. Emma、Ada Martinelli、Marco Lombardo、Arianna Quintavalla、Claudio Trombini、Zois Syrgiannis、Maurizio Prato
DOI:10.1002/adsc.201900009
日期:2019.6.18
[60]fullerene via click chemistry provides a highlyefficient supported enantioselectiveorganocatalyst, which was successfully exploited in a Michaeladdition of malonates to cinnamaldehydes, via iminium ion activation. The supported organocatalyst was recycled up to six times, with only a moderate decrease in terms of activity and with no loss in enantioselectivity.