A green and highly efficient iron‐catalyzed one‐pot oxidation/Knoevenagel tandem reaction for the synthesis of α, β‐unsaturated nitriles from secondary alcohols and malononitrile has been achieved. The reaction performed under mild conditions with air as an oxidant, and provided the corresponding oxidation/Knoevenagel prudocts in good to excellent yields within short times avoiding the use of noble
Organocatalytic Asymmetric Michael/Cyclization Cascade Reactions of 3-Hydroxyoxindoles/3-Aminooxindoles with α,β-Unsaturated Acyl Phosphonates for the Construction of Spirocyclic Oxindole-γ-lactones/lactams
Enantioselective Michael/cyclization cascade reactions of 3-hydroxyoxindoles/3-aminooxindoles with α,β-unsaturatedacyl phosphonates by using a cinchonine derived squaramide as the catalyst were developed. A broad range of spirocyclic oxindole-γ-lactones/lactams could be obtained in moderate to excellent yields (up to 98%) with good to excellent diastereo- and enantioselectivities (up to >99:1 dr and
A novel Michael Addition and subsequent 4‐exo‐tet ring closure sequence with easily accessible N‐unsubstituted or N‐alkyl‐substituted oxindoles and phenyl vinyl selenone in aqueous basic conditions is described.
An organocatalytic asymmetric sequential allylic alkylation–cyclization of Morita–Baylis–Hillman carbonates and 3-hydroxyoxindoles
作者:Qi-Lin Wang、Lin Peng、Fei-Ying Wang、Ming-Liang Zhang、Li-Na Jia、Fang Tian、Xiao-Ying Xu、Li-Xin Wang
DOI:10.1039/c3cc45139a
日期:——
The first organocatalytic asymmetric sequential allylic alkylationâcyclization of MoritaâBaylisâHillman carbonates and 3-hydroxyoxindoles has been developed to afford spirooxindoles bearing α-methylene-γ-butyrolactone motifs in 25â85% yield, 60â94% ee and up to >20â:â1 diastereoselectivity.