Highly Enantioselective Synthesis of Chiral Pyranonaphthoquinone-Fused Spirooxindoles through Organocatalytic Three-Component Cascade Reactions
作者:Hong-Wu Zhao、Bo Li、Ting Tian、Wei Meng、Zhao Yang、Xiu-Qing Song、Xiao-Qin Chen、Hai-Liang Pang
DOI:10.1002/ejoc.201500152
日期:2015.5
cinchona-thiourea organocatalyst C1, the developed organocatalytic three-component cascade reaction of isatins, malononitrile, and 2-hydroxynaphthalene-1,4-diones readily proceeded to furnish chiral pyranonaphthoquinone-fused spirooxindoles in excellent chemical yields and high enantioselectivities (up to 99 % yield and 97 % ee). The absolute configurations of the spirooxindoles were assigned on the basis of an X-ray