Strongly Reducing, Visible‐Light Organic Photoredox Catalysts as Sustainable Alternatives to Precious Metals
作者:Ya Du、Ryan M. Pearson、Chern‐Hooi Lim、Steven M. Sartor、Matthew D. Ryan、Haishen Yang、Niels H. Damrauer、Garret M. Miyake
DOI:10.1002/chem.201702926
日期:2017.8.16
Photoredox catalysis is a versatile approach for the construction of challenging covalent bonds under mild reaction conditions, commonly using photoredox catalysts (PCs) derived from precious metals. As such, there is need to develop organic analogues as sustainable replacements. Although several organic PCs have been introduced, there remains a lack of strongly reducing, visible-light organic PCs
COMPOSITIONS AND METHODS OF PROMOTING ORGANIC PHOTOCATALYSIS
申请人:THE REGENTS OF THE UNIVERSITY OF COLORADO, A BODY CORPORATE
公开号:US20180237550A1
公开(公告)日:2018-08-23
The invention provides novel compounds and methods that are useful in promoting reactions that proceed through an oxidative quenching pathway. In certain embodiments, the reactions comprise atom transfer radical polymerization.
performed in toluene, the catalytic study of complexes 2a‐d has carried out no additional solvent and alcohol acted both as solvent and reactant of alkylating by using a little excess of alcohols. Surprisingly, conversion and selectivity of amine product for alkylation reaction have been seen high in medium solvent‐free relative to in toluene.
在本文中,已经研究了胺与醇衍生物的直接N烷基化反应。为此,已经合成了带有N配位苯并咪唑配合物的新系列钌(II)配合物,并通过元素分析,FT-IR,1 H NMR和13 C NMR光谱进行了全面表征。此外,配合物2b和2c的结构已通过X射线晶体学确认。尽管N-烷基化反应通常在甲苯中进行,但配合物2a-d的催化研究没有使用额外的溶剂,并且通过使用少量过量的醇,醇既充当溶剂又充当烷基化反应物。令人惊讶的是,与甲苯相比,在无溶剂的中等溶剂中胺产物的烷基化反应转化率和选择性高。
C–N Cross-Coupling via Photoexcitation of Nickel–Amine Complexes
作者:Chern-Hooi Lim、Max Kudisch、Bin Liu、Garret M. Miyake
DOI:10.1021/jacs.8b03744
日期:2018.6.20
science, biology, and medicine. Transition metal complexes can elegantly orchestrate diverse aminations but typically require demanding reaction conditions, precious metal catalysts, or oxygen-sensitive procedures. Here, we introduce a mild nickel-catalyzed C-N cross-coupling methodology that operates at room temperature using an inexpensive nickelsource (NiBr2·3H2O), is oxygen tolerant, and proceeds
Palladium-Catalysed Direct 5-Arylation of Furfurylamine or 2-(Aminoalkyl)thiophene Derivatives
作者:Julien Roger、Henri Doucet
DOI:10.1002/ejoc.201000358
日期:——
The palladium-catalyseddirect5-arylation of furan or thiophenederivatives bearing CH2NHR substituents (with R = COMe or CO2tBu) generally proceeds in good yields by using a catalysts loading of only 0.1-2 mol-%. A wide range of functions such as acetyl, propionyl, formyl, ester, nitrile, trifluoromethyl or fluoro on the aryl bromide is tolerated. Higher yields were generally obtained in the presence