A New Robust and Efficient Ion-Tagged Proline Catalyst Carrying an Amide Spacer for the Asymmetric Aldol Reaction
作者:Elisa Montroni、Shrihari P. Sanap、Marco Lombardo、Arianna Quintavalla、Claudio Trombini、Dilip D. Dhavale
DOI:10.1002/adsc.201100595
日期:2011.11
cis-ion-tagged catalyst (8a), possessing an amide linkage between the imidazolium tag and the proline ring, is described. This new bench-stable catalyst has been tested in the classic asymmetric aldolcondensation between ketones and aldehydes “in the presence” of water, and is proposed as a valuable alternative to the analogous but more sensitive ester cis-2d. Catalyst 8a displayed an excellent efficiency