Asymmetric Michael Addition Induced by the Anion of an Imidazolium Salt
作者:Vincent Gauchot、Julien Gravel、Andreea R. Schmitzer
DOI:10.1002/ejoc.201201068
日期:2012.11
We describe the application of a chiral catalytic imidazoliumsalt derived from trans-L-hydroxyproline, the anion being the catalytic entity, as a catalyst for the asymmetricMichaeladdition. We report the first example of a catalytic Michaeladdition using this type of catalyst, leading to excellent yields (up to 99 %) and good selectivities (up to 99:1 dr, up to 82 % ee).
Catalytic Anions Embedded into Avidin: Importance of Their Chirality and the Chiral Environment on the Stereocontrol of the Aldol Reaction
作者:Vincent Gauchot、Andreea R. Schmitzer
DOI:10.1021/jo5002406
日期:2014.3.21
Several catalytic anions bearing a pseudo-dipeptide scaffold, in combination with a biotinylated imidazolium cation, were prepared. The assembly of these salts with avidin resulted in the formation of stable biohybridcatalysts, active in ionicliquid/aqueous media for the aldol reaction. By using natural and non-natural amino alcohols as “side chains” for the proline derivative anion, we studied the