Synthesis of a self-assembling gold nanoparticle-supported organocatalyst for enamine-based asymmetric aldol reactions
作者:Péter Lajos Sóti、Hiroki Yamashita、Kohei Sato、Tetsuo Narumi、Mitsuo Toda、Naoharu Watanabe、György Marosi、Nobuyuki Mase
DOI:10.1016/j.tet.2016.02.065
日期:2016.4
acid, was used for enamine-based aldolreactions. The modified Brust-Schiffrin (BS) synthesis was favored over the ligand exchange reaction in order to develop a new and simple synthetic pathway for nanoparticle-supported catalyst. Use of immobilized organocatalyst on nanoscale solid carrier led to excellent selectivities (up to 94:6 dr and 94% ee) in asymmetricreactions of ketones and benzaldehydes.
Synthesis of <i>N</i>-alkylated lipopeptides and their application as organocatalysts in asymmetric Michael addition in aqueous environments
作者:José A. C. Delgado、Fidel E. M. Vicente、Alexander F. de la Torre、Vitor A. Fernandes、Arlene G. Corrêa、Márcio W. Paixão
DOI:10.1039/d1nj01112j
日期:——
through an isocyanide-based multicomponent reaction. Various structural motifs were tunably introduced on the catalyst backbone with the aim of incorporating amphiphilic features. Consequently, they have further been evaluated in the 1,4-addition of aldehydes to trans-β-nitrostyrene having water as the sole solvent. Under sustainable reactionconditions, Michael adducts were obtained in excellent yields