A highly efficient catalytic asymmetric Diels-Alderreaction between 3-vinylindoles and methyleneindolinones has been achieved using chiral N,N'-dioxide-Ni(II) complexes as the catalysts. A wide variety of substrates were readily tolerated, generating exclusively the corresponding exo-carbazolespirooxindole derivatives in excellent yields with high enantiomeric excesses (up to 98% yield, >99 : 1 d
Protecting Group-Directed Diastereodivergent Synthesis of Chiral Tetrahydronaphthalene-Fused Spirooxindoles via Bifunctional Tertiary Amine Catalysis
作者:Biao Wang、Xiao-Hui Wang、Wei Huang、Jin Zhou、Hong-Ping Zhu、Cheng Peng、Bo Han
DOI:10.1021/acs.joc.9b01501
日期:2019.8.16
the β-position of THN has been developed. The diastereodivergent direct catalytic Michael–aldol reaction between 3-ylideneoxindole and 2-methylbenzaldehyde was accomplished by using bifunctional tertiaryamine. Simply changing the protecting group on the substrate in the organocatalytic cascade reaction led to inverted diastereoselectivity in good yields with a high ee value. To explain the diastereodivergence
An organocatalytic domino Michael-alkylation reaction: highly enantioselective construction of spiro-cyclopentanoneoxindoles and tetronic acid scaffolds
作者:Jing Zhou、Qi-Lin Wang、Lin Peng、Fang Tian、Xiao-Ying Xu、Li-Xin Wang
DOI:10.1039/c4cc05207b
日期:——
A new organocatalytic asymmetric domino Michael-alkylation reaction of methyleneindolinones and gamma-halogenated-beta-ketoesters is described. A variety of spiro-cyclopentanoneoxindoles were obtained in high yields (up to 96%), good diastereoselectivities (up to 12 : 1 dr) and excellent enantioselectivities (up to >99% ee) via alpha-alkylation. Interestingly, O-alkylated products with tetronic acid
Squaramide-Catalyzed Enantioselective Cascade Approach to Bispirooxindoles with Multiple Stereocenters
作者:Bo-Liang Zhao、Da-Ming Du
DOI:10.1002/adsc.201600782
日期:2016.12.22
bifunctional squaramide‐catalyzed Michael/Michael cascade reaction for the construction of spirotetrahydrofuran bispirooxindoles was developed. The products were obtained in moderate to excellent yields with excellent diastereo‐ and enantioselectivities (up to >20:1 dr, >99% ee). This straightforward process serves as a powerful method for the enantioselective construction of potentially bioactive bispirooxindoles
A new enantioselective cyclopropanation of 3‐alkenyl‐oxindoles with sulfoxonium ylides was realized by using a chiral N,N′‐dioxide/Mg(OTf)2 complex as the catalyst. Various chiral spiro‐cyclopropyl oxindoles containing two or three continuous chiral carbon centres were obtained in high yields (up to 99%) with good dr (up to 97:3 dr) and high ee values (up to 94% ee).