Pd-catalyzed cross-coupling reactions of various arenediazoniumsalts with ArSi(OR)3 and KArBF3 have been achieved in good to excellent yields under simple aerobic conditions in water at room temperature. The functional group tolerance makes these transformations as attractive alternatives to the traditional cross-coupling approaches. Furthermore, the sequence can also be performed in a one-pot domino
Straightforward synthesis of phenanthrenes from styrenes and arenes
作者:Hu Li、Ke-Han He、Jia Liu、Bi-Qin Wang、Ke-Qing Zhao、Ping Hu、Zhang-Jie Shi
DOI:10.1039/c2cc33100d
日期:——
Semi-one-pot synthesis of phenanthrenesfrom styrenes and arenes was developed through cross-dehydrogenative coupling. A sequence of Heck-type coupling and photo-cyclization were involved and a variety of functionalities were tolerated. This method provides an effective and practical protocol towards the synthesis of substituted phenanthrenes.
Merging visible-light photoredox and micellar catalysis: arylation reactions with anilines nitrosated <i>in situ</i>
作者:Mei-jie Bu、Guo-ping Lu、Jianzhong Jiang、Chun Cai
DOI:10.1039/c8cy01221k
日期:——
utilized as the photocatalyst, and Triton X-100 was employed as the surfactant; both are inexpensive and commercially available. This clean and energy-saving catalytic system enables photocatalytic reactions of the diazonium ion generated in situ to proceed smoothly in water without any co-solvents or additives at room temperature.
2-Arylbenzoylchlorides undergo annulativecoupling with internal alkynes in the presence of a catalyst system of [IrCl(cod)]2/P(t-Bu)3 to selectively afford the corresponding phenanthrenederivatives accompanied by elimination of carbon monoxide and hydrogen chloride. The reaction occurs without addition of any external base. Deuterium-labeling experiments using 2-(d5-phenyl)benzoyl chloride suggest
Nickel(II) Tetraphenylporphyrin as an Efficient Photocatalyst Featuring Visible Light Promoted Dual Redox Activities
作者:Tanumoy Mandal、Sanju Das、Suman De Sarkar
DOI:10.1002/adsc.201801737
日期:2019.7.2
cost‐effective and efficientvisiblelight induced photoredoxcatalyst. The ground state electrochemical data (CV) and electronic absorption (UV‐Vis) spectra reveal the excited state redox potentials for [NiTPP]*/[NiTPP].− and NiTPP].+/[NiTPP]* couples as +1.17 V and −1.57 V vs SCE respectively. The potential values represent NiTPP as a more potent photocatalyst compare to the well‐explored [Ru(bpy)3]2+. The non‐precious