A diastereodivergentasymmetric Michael-alkylation reaction between 3-chloro-oxindoles and β,γ-unsaturated-α-ketoesters has been achieved using L-RaPr2/Sc(OTf)3 and L-PrPr2/Mg(OTf)2 metal complexes as catalysts. Both rel-(1R,2S,3R) and rel-(1S,2S,3R) chiral spiro cyclopropane oxindoles were constructed in good yields, diastereoselectivities and ee values. The diastereodivergent control may originate
Catalytic Asymmetric [4 + 1] Cyclization of Benzofuran-Derived Azadienes with 3-Chlorooxindoles
作者:Cong-Shuai Wang、Tian-Zhen Li、Yu-Chun Cheng、Ji Zhou、Guang-Jian Mei、Feng Shi
DOI:10.1021/acs.joc.8b03004
日期:2019.3.15
[4 + 1] cyclization of benzofuran-derived azadienes with 3-chlorooxindoles has been established, which constructed chiral spirooxindole frameworks with in situ generation of a five-membered ring with high diastereoselectivities (up to >95:5 dr) and good enantioselectivities (up to 94:6 er). This reaction represents the first catalytic asymmetric [4 + 1] cyclization of benzofuran-derived azadienes, which
Construction of Enantioenriched Quaternary C–Cl Oxindoles through Palladium-Catalyzed Asymmetric Allylic Substitution with Chloroenolates
作者:Wen Huang、Jingjie Yang、Kai Gao、Zhiming Wang、Guobo Huang、Weijun Yao、Jianguo Yang
DOI:10.1021/acs.joc.3c01811
日期:2023.11.3
A palladium-catalyzed asymmetric chloroenolate allylation with vinyl benzoxazinanones under mild reaction conditions has been developed, affording a series of optically active 3,3-disubstitutedoxindoles exhibiting a chloro-group and a linear aryl amino side chain in good yields with up to 96% ee. Versatile functional group tolerance on the benzene ring has been demonstrated, and the utility of this