SEARCH Articles Figures Tables Asymmetric Cycloaddition Catalyzed by Cinchona-Based Phase-Transfer Catalysts Aziridination of Enones Using Cinchona-Based Chiral Phase-Transfer Catalyst Catalyst phase Catalysts transfer Cinchona Cinchona bases Cinchona catalyst Cinchona phase transfer catalysts Cinchona-based phase-transfer Phase transfer catalysis cinchona-based catalysts