Copper-Catalyzed Selective <i>N</i>-Vinylation of 3-(Hydroxyimino)indolin-2-ones with Alkenyl Boronic Acids: Synthesis of <i>N</i>-Vinyl Nitrones and Spirooxindoles
作者:Chun-Hua Chen、Qing-Qing Liu、Xiao-Pan Ma、Yu Feng、Cui Liang、Cheng-Xue Pan、Gui-Fa Su、Dong-Liang Mo
DOI:10.1021/acs.joc.7b00620
日期:2017.6.16
A copper-catalyzed selective cross-coupling reaction of 3-(hydroxyimino)indolin-2-ones with alkenylboronicacids to access (E)-N-vinyl oxindole nitrones has been achieved under mild conditions. The studies showed that catalytic copper salt selectively gave mono N-vinylation products, while 2.0 equiv of copper salt provided double N-vinylation products. The control experiments revealed that the carbonyl
Methyl Pyruvate Oxime as a Carbonyl Synthon: Synthesis of Ureas, Carbamates, Thiocarbamates, and Anilides
作者:Seo Yeon Kim、Hee Nam Lim
DOI:10.1021/acs.orglett.4c01007
日期:2024.5.10
strategy for the synthesis of unsymmetrical ureas, carbamates, thiocarbamates, and anilides was developed with methyl pyruvate oxime as the carbonyl synthon. The intrinsic reactivity of the reagent enabled consecutive disubstitution involving direct amidation and one-pot deoximative substitution with various nucleophiles. The utility of the method was demonstrated with the synthesis of bioactive molecules
Synthesis of <i>N</i>-Aryl Oxindole Nitrones through a Metal-Free Selective <i>N</i>-Arylation Process
作者:Si-Yi Wu、Xiao-Pan Ma、Cui Liang、Dong-Liang Mo
DOI:10.1021/acs.joc.6b02774
日期:2017.3.17
An efficient selective N-arylation of 3-(hydroxyimino)indolin-2-ones with diaryliodonium salts to prepare (Z)-N-aryl oxindole nitrones has been achieved under simple base-mediated conditions. The reaction tolerated a variety of diaryliodonium salts with diverse and sensitive functional groups. Studies on the oxime structures revealed that the pyrroline ring and carbonyl group in 3-(hydroxyimino)indolin-2-ones played important roles in the selective N-arylation process. The N-aryl oxindole nitrones could be prepared rapidly and easily at the gram scale.
Pronounced ionic liquid effect in the synthesis of biologically active isatin-3-oxime derivatives under acid catalysis
作者:Angelo C. Pinto、Alexandre A. Moreira Lapis、Barbara Vasconcellos da Silva、Renato S. Bastos、Jaïrton Dupont、Brenno A.D. Neto
DOI:10.1016/j.tetlet.2008.07.067
日期:2008.9
An efficient method was developed for the preparation of isatin-3-oxime derivatives with Bronsted and/ or Lewis acids in irniclazoliurn-based ionic liquids. Isatin-3-oxime bearing the electron donating methoxy group was equally obtained in good yields.The pronounced ionic liquid effect avoids the direct forniation of isatin in the acidified media and the reaction leads exclusively to isatin-3-oxime derivatives. 0 2008 Elsevier Ltd. All rights reserved.
GRAY J.; WARING D. R., J. HETEROCYCL. CHEM., 1980, 17, NO 1, 65-67