A zinc‐mediated α‐selective prenylation of isatin‐derived imine in a sealed tube has been developed. The method is highly efficient and operationally simple with its use of readily available prenyl bromide as the prenyl source. The obtained prenylated adduct can be further manipulated to other more complicated derivatives through cyclization or oxidation.
Chiral Squaramide-Catalyzed Asymmetric Mannich Reactions for Synthesis of Fluorinated 3,3′-Bisoxindoles
作者:Bing-Yu Li、Da-Ming Du
DOI:10.1002/adsc.201800513
日期:2018.8.17
squaramide‐catalyzed asymmetric Mannichreaction of 3‐fluorooxindoles to isatin‐derived imines for synthesis of fluorinated 3,3′‐bisoxindoles with two contiguous stereocenters under mild conditions was developed. The corresponding 3,3′‐bisoxindoles were obtained in excellent yields with excellent diastereo‐ and enantioselectivities (up to 99% yield, >99:1 dr and >99% ee). What's more, this reaction can be gram‐scaled
Gold-Catalyzed Cascade Reaction of Yne-Enones with Iminooxindoles, Access to 3,2′-Pyrrolidinyl-Spirooxindole Derivatives
作者:Yijun Liu、Xiaojiang Shen、Pengyan Zhu、Jiang-miao Hu、Xuanjun Wang、Shulin Ge
DOI:10.1021/acs.orglett.4c01395
日期:2024.6.7
Herein, a gold-catalyzedcascade reaction of yne-enones with iminooxindoles has been developed through a cascade cycloisomerization/(3 + 2) annulation process. This approach provides a straightforward and efficient route for the synthesis of functionalized 3,2′-pyrrolidinyl-spirooxindoles in high reactivity and broad substrate scope with excellent cis-selectivity. Moreover, the subsequent functionalization