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.
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.
Enantioselective Michael Addition of Malonates to Aromatic α,β-Unsaturated Aldehydes Organocatalyzed by (S)-2-[bis(3,4,5-Trifluorophenyl) trimethylsilanyloxymethyl]pyrrolidine
The Michael addition of malonates to aromatic α,β-unsaturated aldehydes was efficiently organocatalyzed by (S)-2-[bis(3,4,5-trifluorophenyl)trimethylsilanyoxymethyl]pyrrolidine, derived from L-proline to afford the corresponding adducts in good yields with good to excellent enantioselectivities.