Enantioselective Michael Addition of Malonates to Aromatic α,β-Unsaturated Aldehydes Organocatalyzed by (S)-2-[bis(3,4,5-Trifluorophenyl) trimethylsilanyloxymethyl]pyrrolidine
Multistep Organocatalysis for the Asymmetric Synthesis of Multisubstituted Aldehydes from Allylic Alcohols
作者:Xuan-Huong Ho、Hyun-Ji Oh、Hye-Young Jang
DOI:10.1002/ejoc.201200863
日期:2012.10
chiral amine organocatalyst induces the formation of multifunctionalized aldehydesfrom aromatic and aliphatic allylicalcohols. Reactions occur with excellent levels of enantioselectivity, under environmentally benign conditions, and without involving stoichiometric amounts of chemical oxidants for the oxidation of the allylicalcohols or rigorous reaction conditions for transition-metal catalysis.
An Eco-Friendly Asymmetric Organocatalytic Conjugate Addition of Malonates to α,β-Unsaturated Aldehydes: Application on the Synthesis of Chiral Indoles
作者:Karla Santos Feu、Anna Maria Deobald、Senthil Narayanaperumal、Arlene G. Corrêa、Márcio Weber Paixão
DOI:10.1002/ejoc.201300431
日期:2013.9
synthetic community faces the need to ad-dress growing environmental concerns. To lessen the envi-ronmental impact of organic transformations, all conven-tional synthetic methodologies, including asymmetric syn-thetic protocols, should be reviewed and, if possible, re-placed by new processes that continue to meet the needs ofefficiency, selectivity but that are environmentally benign.
Base-Base Bifunctional Catalysis: A Practical Strategy for Asymmetric Michael Addition of Malonates to α,β-Unsaturated Aldehydes
作者:Yongcan Wang、Pengfei Li、Xinmiao Liang、Jinxing Ye
DOI:10.1002/adsc.200800070
日期:2008.6.9
Lewis base–Brønsted base bifunctional catalysis is a novel and practical strategy for the asymmetricMichaeladdition. The addition of malonates to a series of α,β-unsaturated aldehydes can take place under base–base bifunctional catalytic conditions using 0.5–5 mol% of (S)-2-[diphenyl(trimethylsilyloxy)methyl]pyrrolidine as catalyst and 5–30 mol% of lithium 4-fluorobenzoate as additive base with up
Merging organocatalysis with transition metal catalysis and using O2 as the oxidant for enantioselective C–H functionalization of aldehydes
作者:Yong-Long Zhao、Yao Wang、Xiu-Qin Hu、Peng-Fei Xu
DOI:10.1039/c3cc44214d
日期:——
A new catalytic Saegusa oxidation-Michael addition cascade reaction has been developed for the enantioselective beta-functionalization of aldehydes. The feature of this research is the combination of organocatalysis and transition-metal catalysis for the asymmetric C-H functionalization which remains an underdeveloped research topic.
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.