Heterogeneous Dual Photoredox-Lewis Acid Catalysis Using a Single Bifunctional Nanomaterial
作者:Gregory K. Hodgson、Juan C. Scaiano
DOI:10.1021/acscatal.7b04032
日期:2018.4.6
photoredox-Lewis acid catalysis using a versatile and efficient nanocomposite: samarium oxide nanoparticle-decorated titanium dioxide. This emerging class of nanomaterials harnesses the Lewis acidity of the lanthanide, eliminates product contamination by the catalyst, and can be excited with visible light. Useful intermolecular and intramolecular net reductive and net neutral photoredoxcyclization reactions are
7,8‐Dimethoxy‐3‐methylalloxazine was immobilized on mesoporoussilica (MCM‐41) to provide a heterogenized flavin photocatalyst. Thus, the prepared heterogeneous catalyst 2 was found to sensitize the visiblelight [2+2] cycloaddition of various types of dienes to produce corresponding cyclobutanes in high yields and diastereoselectivities. Use of 2 enables procedures which are advantageous owing to
Metal‐Organic Layers Catalyze Photoreactions without Pore Size and Diffusion Limitations
作者:Ruoyu Xu、Tasha Drake、Guangxu Lan、Wenbin Lin
DOI:10.1002/chem.201803635
日期:2018.10.22
limitation and slow diffusion, which are detrimental for photoreactions. Metal‐organic layers (MOLs) have unique ultrathin 2D monolayer structures and overcome pore size and diffusion limitations. Here, the synthesis of photoactive Zr‐RuBPY MOL based on Zr‐oxo clusters and [Ru(bpy)3]2+‐containing linkers is reported as well as its application in photocatalytic [2+2] cyclizations of enones and Meerwein
Enantioselective intramolecular Rauhut–Currier reaction catalyzed by chiral phosphinothiourea
作者:Jing-Jing Gong、Tian-Ze Li、Kun Pan、Xin-Yan Wu
DOI:10.1039/c0cc04412a
日期:——
Chiral organophosphine-catalyzed enantioselective Rauhut-Currier reaction has been disclosed for the first time. With L-valine-derived phosphinothiourea, the intramolecular Rauhut-Currier reaction of bis(enones) was achieved in good yields (up to 99%) with excellent enantioselectivities (up to 99.4% ee).
The copper-catalyzed enantioselectiveconjugateaddition of diethylzinc to acyclic enones was achieved with chiral sulfoxide–phosphine (SOP) ligands. This process showed good functional group tolerance and gave the 1, 4-adducts with excellent enantioselectivities (up to 96% ee).