Tandem Photoredox and Copper-Catalyzed Decarboxylative C(sp<sup>3</sup>)–N Coupling of Anilines and Imines Using an Organic Photocatalyst
作者:Guido Barzanò、Runze Mao、Marion Garreau、Jerome Waser、Xile Hu
DOI:10.1021/acs.orglett.0c01769
日期:2020.7.17
An organic photoredox catalyst, 4CzIPN, was used in combination with a coppercatalyst, CuCl, to effect decarboxylative C(sp3)–N coupling. The coupling worked with both anilines and imines as nitrogen sources and could be used to prepare a variety of alkyl amines from readily available alkyl carboxylic acids.
Synthesis of 1,2,4-dioxazolidines by the ozonolysis of vinyl ethers in the presence of imines. The first [3 + 2] cycloaddition of carbonyl oxide to the carbon–nitrogen double bond
作者:Mitsuyuki Mori、Masatomo Nojima、Shigekazu Kusabayashi、Kevin J. McCullough
DOI:10.1039/c39880001550
日期:——
Carbonyloxides, derived from the ozonolysis of vinylethers, readily undergo [3 + 2] cycloaddition reactions with imines affording 1,2,4-dioxazolidines in good yield.
General and Efficient C–C Bond Forming Photoredox Catalysis with Semiconductor Quantum Dots
作者:Jill A. Caputo、Leah C. Frenette、Norman Zhao、Kelly L. Sowers、Todd D. Krauss、Daniel J. Weix
DOI:10.1021/jacs.6b13379
日期:2017.3.29
Photoredox catalysis has become an essential tool in organic synthesis because it enables new routes to important molecules. However, the best available molecular catalysts suffer from high catalyst loadings and rely on precious metals. Here we show that colloidal nanocrystal quantum dots (QDs) can serve as efficient and robust, precious-metal free, photoassisted redox catalysts. A single-sized CdSe
N-Arylimines and 1-methyl-1-phenylhydrazones of diaryl ketones were prepared, their yields being affected by the electronic and positional effects of substituents of reagent and substrate. Direct preparation of some anils of xanthone and its 1-methyl-1-phenylhydrazone was achieved by use of the corresponding iminodimagnesium reagents.
Selective Radical–Radical Cross-Couplings: Design of a Formal β-Mannich Reaction
作者:Jenna L. Jeffrey、Filip R. Petronijević、David W. C. MacMillan
DOI:10.1021/jacs.5b05376
日期:2015.7.8
organocatalysis. Transient β-enaminyl radicals derived from ketones via enamine and oxidative photoredox catalysis readily combine with persistent α-amino radicals in a highly selective hetero radical-radical coupling. This novel pathway to γ-aminoketones is predicated upon the use of DABCO as both a base and an electron transfer agent. This protocol also formally allows for the direct synthesis of