Cascade Michael/aldol/rearrangement between phenacylmalononitriles and maleimides: highly diastereoselective access to functionalized bicyclic cyclopentenes containing a CN-substituted all-carbon quaternary center

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A highly diastereoselective approach towards the synthesis of quaternary center-containing cyclopentenes was developed. The tandem Michael/aldol/rearrangement processes occurred under mild reaction conditions.