<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
Highly enantioselective and recyclable organocatalytic Michael addition of malonates to α,β-unsaturated aldehydes in aqueous media
作者:Subrata K. Ghosh、Kritanjali Dhungana、Allan D. Headley、Bukuo Ni
DOI:10.1039/c2ob26248g
日期:——
in our lab, has been found to be very effective for the Michaeladdition reaction in aqueous solvents involving a wide range of α,β-unsaturated aldehydes and malonatederivatives. For the reactions studied, good to excellent yields (73%–96%) and high to excellent enantioselectivities (up to 97%) were obtained using this catalyst. In addition, the catalyst could be recycled up to four times with gradual
Water-Compatible Iminium Activation: Organocatalytic Michael Reactions of Carbon-Centered Nucleophiles with Enals
作者:Claudio Palomo、Aitor Landa、Antonia Mielgo、Mikel Oiarbide、Ángel Puente、Silvia Vera
DOI:10.1002/anie.200703261
日期:2007.11.12
Heterogeneous Jørgensen–Hayashi catalyst for asymmetric Michael addition of malonates to α,β-enals. Cooperative effect with Ca(OTf)2
作者:Anton A. Guryev、Maksim V. Anokhin、Alexei D. Averin、Irina P. Beletskaya
DOI:10.1016/j.mencom.2016.11.002
日期:2016.11
Heterogeneous chiral Jorgensen-Hayashi catalyst promotes enantioselective Michael addition of malonates at cinnamic aldehydes. In combination with Ca(OTf)(2), it provides high yields (up to 78%) and excellent enantiomeric excesses (up to 99%) of the adducts.
Organocatalytic Conjugate Addition of Malonates to α,β-Unsaturated Aldehydes: Asymmetric Formal Synthesis of (−)-Paroxetine, Chiral Lactams, and Lactones