<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
Hollow structural effect of microporous organocatalytic polymers with pyrrolidines: dramatic enhancement of catalytic performance
作者:Kyoungil Cho、Jin Yoo、Hyeong-Wan Noh、Sang Moon Lee、Hae Jin Kim、Yoon-Joo Ko、Hye-Young Jang、Seung Uk Son
DOI:10.1039/c7ta02404e
日期:——
Hollow and microporous organocatalytic polymers bearing pyrrolidines (H-MOP-P) were prepared by template synthesis and post-synthetic modification and showed enhanced performance, compared to nonhollow ones.
An enantio- and diastereoselective approach to indoloquinolizidines in continuous flow
作者:Moreshwar B. Chaudhari、Prachi Gupta、Patricia Llanes、Leijie Zhou、Nicola Zanda、Miquel A. Pericàs
DOI:10.1039/d2ob01462a
日期:——
short synthesis of indoloquinolizidines. Using this approach, a highly enantioselective, solvent-free and rapid conjugate addition of dimethyl malonate to a diverse family of cinnamaldehydes in continuous flow, allowing the preparation of relevant oxodiesters in multigram amounts has been developed. The obtained Michael adducts have been used to complete an expedient diastereoselective synthesis of indoloquinolizidine
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