elusive. In this context, the present article describes the successful execution of the direct, organocatalyticasymmetricMichaeladdition of prochiral 3‐alkylideneoxindoles to nitroolefins. A variety of γ‐substituted alkylideneoxindoles carrying two stereocenters at both the γ‐ and δ‐carbon sites was assembled with excellent stereoselectivity and without olefin isomerization or stereochemical ablation
Advanced palladium free approach to the synthesis of substituted alkene oxindoles <i>via</i> aluminum-promoted Knoevenagel reaction
作者:Daria S. Novikova、Tatyana A. Grigoreva、Andrey A. Zolotarev、Alexander V. Garabadzhiu、Vyacheslav G. Tribulovich
DOI:10.1039/c8ra07576j
日期:——
A synthetic route for the synthesis of C24, as well as for the design of focused libraries of direct AMPK activators was developed based on a convergent strategy. The proposed scheme corresponds to the current trends in C–H bond functionalization. The use of aluminum isopropoxide for the Knoevenagel condensation of oxindole with benzophenones is a noticeable point of this work.
We have developed efficient catalytic methods for the stereoselective and diversity synthesis of various (E)-, (Z)-, and disubstituted 3-alkylideneoxindoles and 3-alkylidenebenzofuran-2-ones via palladium-catalyzed Heck/Suzuki−Miyaura, Heck/Heck, and Heck/carbonylation/Suzuki−Miyaura domino reactions.
InCl<sub>3</sub>/TfOH-Mediated Convenient Synthesis of 3-Alkylideneoxindoles from 2-Oxindoles with 1,3-Diones, Ketones, or Aldehydes
作者:Xia Chen、Xiao-Yu Zhou、Hai-Long Liu、Chao Ding、Jin-Hui Li
DOI:10.1021/acs.joc.4c00202
日期:2024.4.5
methods for the synthesis of 3-alkylideneoxindoles are described in this paper. The InCl3/TfOH-mediated tandem Knoevenagel condensation–deacylation sequence of various 2-oxindoles with 1,3-diones or acetoacetate furnished 3-alkylideneoxindoles in satisfactory to excellent yields (up to >99% yield). Employing the reaction system, the condensation of 2-oxindoles with ketones or aldehydes also proceeded
An expedient synthesis of 3-alkylideneoxindoles by Ti(O Pr)4/pyridine-mediated Knoevenagel condensation
作者:Hyun Ju Lee、Jin Woo Lim、Jin Yu、Jae Nyoung Kim
DOI:10.1016/j.tetlet.2013.12.097
日期:2014.2
3-Alkylideneoxindoles have been prepared in excellent yields from oxindole and carbonyl compounds via an in situ generated titanium enolate of oxindole. (Z)-3-Alkylideneoxindoles could be synthesized selectively as major products from unsymmetrical ketones. (C) 2014 Elsevier Ltd. All rights reserved.