Organocatalytic Asymmetric Synthesis of 3,3′-Pyrrolidinyl-bispirooxindoles via Michael/<i>N</i>-Hemiketalization Cascade Reaction between 3-Aminooxindoles and Isatin-Derived β,γ-Unsaturated α-Keto Esters
作者:Ye Lin、Bo-Liang Zhao、Da-Ming Du
DOI:10.1021/acs.joc.8b00632
日期:2018.8.3
through a Michael/N-hemiketalization cascade reaction of 3-aminooxindoles and isatin-derived β,γ-unsaturated α-keto esters was developed. Under mild conditions, a series of 3,3′-pyrrolidinyl-bispirooxindoles were obtained in moderate to good yields with high diastereo- and enantioselectivities by using a cinchona-derived bifunctionalsquaramideorganocatalyst. This work represents the first example using