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
Histidine-Containing Peptide Catalysts Developed by a Facile Library Screening Method
作者:Kengo Akagawa、Nobutaka Sakai、Kazuaki Kudo
DOI:10.1002/anie.201410268
日期:2015.2.2
resin‐bound peptides through reductive amination to visualize active catalysts. This procedure allows for the monitoring of the reactivity of entire peptides without modifying the resin beads beforehand. Peptidescontaininghistidine at an appropriate position were identified by this method. A novel function of the histidyl residue, which enhances the binding of a substrate to the catalyst by capturing an iminium
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 oxidative domino reactions of allylic alcohols to functionalized aldehydes have been developed. The one pot domino oxidation-iminium activation represents a convenient strategy for the enantioselective addition of malonates to allylic alcohols and the asymmetric formation of formyl cyclopropanes.