Regio- and Stereoselective Cyanotriflation of Alkynes Using Aryl(cyano)iodonium Triflates
作者:Xi Wang、Armido Studer
DOI:10.1021/jacs.6b00869
日期:2016.3.9
A novel, mild, and versatile approach for regioselective syn-addition of both the CN and OTf groups of aryl(cyano)iodonium triflates to alkynes is described. The reaction uses Fe-catalysis and can be conducted in gram scale. Products of the vicinal cyanotriflation can be stereospecifically readily further functionalized, rendering the method highly valuable.
Visible light promoted coupling of alkynyl bromides and Hantzsch esters for the synthesis of internal alkynes
作者:Zhi-Yong Song、Chun-Lin Zhang、Song Ye
DOI:10.1039/c8ob02912a
日期:——
A metal-free visible light promoted C(sp3)–C(sp) coupling reaction of alkynyl bromides and Hantzsch esters was developed, giving internal alkynes with primary, secondary, tertiary alkyl or other functional groups in good to high yields.
bisacylphosphine oxide photoinitiator was used for the light mediated preparation of palladium nanoparticles (PdNPs) with a small diameter of 2.8 nm. All starting materials are commercially available, and PdNP synthesis is experimentally very easy to conduct. The PdNP-hybrid material was applied as catalyst for the semihydrogenation of various internal alkynes to provide the corresponding alkenes in excellent yields
facile light‐mediated preparation of small palladium nanoparticles (PdNPs) with a diameter of 1.3 nm and low dispersity by using low‐priced and readily prepared photoactive polymers is presented. These polymers act as reagents for the photochemical reduction of Pd ions and they are also stabilizers for the PdNPs generated in situ. The PdNP–polymer hybrid materials prepared by this reliable approach are
Redox-Activated Amines in C(<i>sp</i><sup>3</sup>)–C(<i>sp</i>) and C(<i>sp</i><sup>3</sup>)–C(<i>sp</i><sup>2</sup>) Bond Formation Enabled by Metal-Free Photoredox Catalysis
作者:Michał Ociepa、Joanna Turkowska、Dorota Gryko
DOI:10.1021/acscatal.8b03437
日期:2018.12.7
one of the most prevalent structural motifs in organic chemistry. Therefore, application of amines as alkylating agents in synthesis is highly compelling. Herein, we present a metal-free photoredox strategy for the formation of C(sp3)–C(sp) and C(sp3)–C(sp2) bonds from redox-activated primary aminederivatives. The developed reaction of 2,4,6-triphenylpyridinium salts with alkynyl p-tolylsulfones, leading