Palladium-Catalyzed Coupling of 3-Halo-Substituted Coumarins, Chromenes, and Quinolones with Various Nitrogen-Containing Nucleophiles
作者:Mohamed Ali Soussi、Davide Audisio、Samir Messaoudi、Olivier Provot、Jean-Daniel Brion、Mouâd Alami
DOI:10.1002/ejoc.201100480
日期:2011.9
An efficient and general palladium-catalyzedcoupling reaction between 3-bromocoumarins, 3-bromoquinolin-2(1H)-ones, and 3-iodo-2H-chromenes with a variety of nitrogen-containingnucleophiles (azole, amide, lactam, sulfonamide, aniline, amine, and urea) is described. The reaction proceeded rapidly and cleanly in dioxane providing the coupling products in good to excellent yields. The chemoselectivity
Oxidative cross coupling reaction mediated by I<sub>2</sub>/H<sub>2</sub>O<sub>2</sub>: a novel approach for the construction of fused thiazole containing coumarin derivatives
作者:Md. Belal、Abu T. Khan
DOI:10.1039/c5ra20405d
日期:——
Various 2-phenyl-4H-chromeno(3,4-d)thiazol-4-one derivatives have been synthesized through C–H bond activation using sodium sulfide as a source of sulfur atoms and by employing I2 as a catalyst and H2O2 as the terminal oxidant.
Praseodymium(III)-Catalyzed Regioselective Synthesis of C<sub>3</sub>-N-Substituted Coumarins with Coumarins and Azides
作者:Jiu-ling Li、Da-chao Hu、Xin-ping Liang、Ying-Chun Wang、Heng-Shan Wang、Ying-ming Pan
DOI:10.1021/acs.joc.7b01410
日期:2017.9.1
A series of C3-N-substituted coumarins were synthesized in good yields directly from coumarins and azides in the presence of Pr(OTf)3 without any additives or ligands needed. The selected compounds 3a, 3c–e, 3g, 3i, 3q, 3u, and 3v exhibited good anticancer activities against MGC-803, A549, and NCI-H460 cell lines with IC50 in the range 8.75–38.54 μmol L–1.
A convenient protocol for the rapid and efficient synthesis of 3-(N-substituted) aminocoumarins is described. The synthetic route developed involves the Pd-catalyzed C–N coupling reaction from readily available 3-bromocoumarin derivatives in the presence of the catalytic system Pd(OAc)2/Xantphos. Under these conditions, a series of nucleophiles including amides, sulfonamides, carbamates and functionalized