SEARCH Articles Figures Tables Catalysis with Natural Cinchona Alkaloids Cinchona Cinchona Alkaloid-Modified Platinum Catalysis Cinchona Alkaloids in Asymmetric Phase-Transfer Catalysis Cinchona Alkaloids in Phase-Transfer Catalysis Cinchona alkaloid catalysis thiourea-based Cinchona alkaloids Cinchonine catalysis Phase-transfer catalysis conditions cinchona alkaloid-derived catalyst