Lead-Halide Perovskites for Photocatalytic α-Alkylation of Aldehydes
作者:Xiaolin Zhu、Yixiong Lin、Yue Sun、Matthew C. Beard、Yong Yan
DOI:10.1021/jacs.8b08720
日期:2019.1.16
Cost-effective and efficient photocatalysis are highly desirable in chemical synthesis. Here we demonstrate that readily prepared suspensions of APbBr3 (A = Cs or methylammonium (MA)) type perovskite colloids (ca. 2-100 nm) can selectively photocatalyze carbon-carbonbond formation reactions, i.e., α-alkylations. Specifically, we demonstrate α-alkylation of aldehydes with a turnover number (TON) of
short peptide linker with the aim of using photons as efficiently as possible in photoredox/enamine dual catalysis. We herein report a peptide-bridged flavin-amine hybrid that can catalyze α-oxyamination of aldehydes with TEMPO under weak blue light irradiation to achieve an extremely high quantum yield of reaction (Φ = 0.80).
Lead-halide perovskite quantum dots embedded in mesoporous silica as heterogeneous photocatalysts combined with organocatalysts for asymmetric catalysis
environments. Hence, we embedded CsPbBr3 quantum dots into KIT-6 mesoporous silica to form silica-shell-protected heterogeneous photocatalysts (CsPbBr3@KIT-6), which were further combined with chiral organocatalysts to explore the activity and stereoselectivity in asymmetric photocatalysis. The well-dispersed CsPbBr3 in KIT-6 channels provides more active sites and exhibits excellent enantioselectivity
The first method to access unsymmetrical aliphatic acyloins is presented. The method relies on a fast 1,3‐hydride shift mediated by an IrIII complex in allylic alcohols followed by oxidation with TEMPO+. The direct conversion of allylic alcohols into acyloins is achieved in a one‐pot procedure. Further functionalization of the Cα′ of the α‐amino‐oxylated ketone products gives access to highly functionalized
Organocatalyzed α-Oxyamination of Aldehydes Using Anodic Oxidation
作者:Nhat-Nguyen Bui、Xuan-Huong Ho、Sun-il Mho、Hye-Young Jang
DOI:10.1002/ejoc.200900871
日期:2009.11
Electrochemical oxidation was performed during the organocatalyzed α-oxyamination of aldehydes by using a one-compartment electrolytic cell under galvanostatic conditions. In the presence of substoichiometric amounts of sec-amines, the desired coupling products were formed in good yield. The asymmetric variant of the α-oxyamination of aldehydes was examined by using chiral sec-amines. Control experiments