Enantioselective Cascade Michael Addition/Cyclization Reactions of 3-Nitro-2H-Chromenes with 3-Isothiocyanato Oxindoles: Efficient Synthesis of Functionalized Polycyclic Spirooxindoles

2014 
The zinc-catalyzed asymmetric cascade Michael addition/cyclization reaction between 3-nitro-2H-chromenes and 3-isothiocyanato oxindoles is described.
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