<i>O</i>-TMS-α,α-diphenyl-(<i>S</i>)-prolinol Modified with an Ionic Liquid Moiety: A Recoverable Organocatalyst for the Asymmetric Michael Reaction between α,β-Enals and Dialkyl Malonates
作者:Oleg V. Maltsev、Alexandr S. Kucherenko、Sergei G. Zlotin
DOI:10.1002/ejoc.200900807
日期:2009.10
O-TMS-α,α-diphenyl-(S)-prolinol derivative bearing an ionicliquid fragment was synthesized for the first time and proven to be an efficient catalyst for the asymmetricMichaelreaction of aromatic α,β-unsaturated aldehydes with dialkylmalonates. The prepared catalyst can be recovered four times and used in the same reaction without a decrease in activity or a decrease in the enantioselectivity of
Enantioselective Michael additions of aldehydes to nitroalkenes catalyzed with ionically tagged organocatalyst
作者:Radovan Šebesta、Attila Latika
DOI:10.2478/s11532-013-0391-4
日期:2014.3.1
Enantioselective organocatalytic Michaeladditions affords useful building blocks for many biologically and medicinally relevant compounds. Ionically-tagged diphenylprolinol silyl ether efficiently catalyzes several Michaeladditions of aldehydes to nitroalkenes in ionicliquids. The Michaeladditions work well in ionicliquids; yields up to 95% and enantioselectivities up to 95% ee were achieved.