Abstract
The water-soluble PEG-supported cinchona ammonium salts were successfully synthesized and used as chiral phase transfer catalysts for the asymmetric alkylation of tert-butyl benzophenone Schiff base derivatives with high chemical yields (up to 98%) and enantioselectivities (up to 97%) in aqueous media. The recycling results showed that the polymers were stable and rarely lost activities.
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