Sodium hydride was employed as a Michael donor under the catalysis of PdCl2 for 1,4‐conjugate reductions of α, β‐unsaturatedcarbonylcompounds, which features operational simplicity, mild conditions and high atom‐economy. The merits of NaH as a reductant were demonstrated by the one‐pot or cascade reactions for the syntheses of complex molecules.
A Comparison of the Photosensitized Rearrangement and the Lewis-Acid-Catalyzed Rearrangement of Spirooxindole Epoxides
作者:Lihong Wang、Yibing Su、Xinmin Xu、Wei Zhang
DOI:10.1002/ejoc.201201020
日期:2012.10.5
Spirooxindole epoxides undergo smooth rearrangement either under photosensitization conditions or under Lewis acid catalysis to give different products. The photosensitized rearrangement of spirooxindole epoxides leads to 3-acyl-2-indolones, such as spiro[cycloalkane-1,3′-indolin]-2,2′-diones, by cleavage of the Cα–O bond followed by alkyl migration. The SnCl4-catalyzed rearrangement of spirooxindole
Enantioselective Synthesis of Thiazolopyran Derivatives via a Direct Vinylogous Michael–<i>oxa</i>-Michael Sequence
作者:Abhijit Manna、Shweta Rohilla、Vinod K. Singh
DOI:10.1021/acs.orglett.3c03971
日期:2024.1.12
An efficient diastereo- and enantioselective direct vinylogous Michael–oxa-Michael sequence between 5-alkenyl thiazolones and isopropylidene oxindoles has been developed. The reaction is catalyzed by a bifunctional squaramide catalyst that allows to access a wide range of densely substituted thiazolopyran derivatives containing a quaternary stereocenter. This protocol is flexible toward different sterically
InCl3/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