An efficient one-step synthesis of 2-acylquinolines using a copper-catalyzed tandem reaction of 2-ethynylanilines with glyoxals in the presence of piperidine has been developed. This new protocol successfully avoids multi-step operation and the use of highly toxic cyanides required in traditional methods, and provides a practical tool for synthetic and pharmaceutical chemists. Various 2-acylquinolines
Tuning the photophysical properties of luminescent lanthanide complexes through regioselective antenna fluorination
作者:Daniel Kocsi、Andreas Orthaber、K. Eszter Borbas
DOI:10.1039/d2cc01229d
日期:——
synthesised from olefinic precursors via a photochemical isomerisation-cyclisation route, and incorporated into octadentate cyclen triacetate ligands that formed luminescent complexes with Tb(III) and Eu(III). The photophysical properties of the emitters were strongly dependent on the position of the fluorination.
在 3、5 或 6 位单氟化的喹诺酮类化合物由烯烃前体通过光化学异构化-环化途径合成,并结合到与 Tb( III ) 和 Eu( III )形成发光络合物的八齿环烯三乙酸酯配体中。发射器的光物理性质强烈依赖于氟化的位置。
Gold(I)‐Catalyzed Benzylic C(sp
<sup>3</sup>
)−H Functionalizations: Divergent Synthesis of Indole[
<i>a</i>
]‐ and [
<i>b</i>
]‐Fused Polycycles**
作者:Luca C. Greiner、Norihito Arichi、Shinsuke Inuki、Hiroaki Ohno
DOI:10.1002/anie.202213653
日期:2023.1.16
The exposure of (alkylphenyl)ethynyl substituted phenyl azides to JohnPhosAu(I) catalysts leads to the divergentsynthesis of indole-fused polycycles via N- or C-cyclization facilitated via benzyl to α-imino gold(I) carbene 1,5-hydride shift. The chemoselectivity depends on the counter-anion, the reactivity of the carbene, and the attached alkyl groups at the benzylic position.
Single Bifunctional Ruthenium Catalyst for One-Pot Cyclization and Hydration giving Functionalized Indoles and Benzofurans
作者:Reji N. Nair、Paul J. Lee、Arnold L. Rheingold、Douglas B. Grotjahn
DOI:10.1002/chem.201001075
日期:2010.7.19
Bifunctional is more than twice as fun! At low loading, catalyst 1 (see scheme) can form two important heterocycle classes, apparently by attack of XH on a vinylidene intermediate. Aza‐ and nitroindoles can be formed, and all N‐protecting groups tested (alkyl, allyl, sulfonyl) were tolerated. The newly formed ring can be deuterated in one step, and for substrates with two terminal alkynes, cyclization