Abstract
New trimeric quaternary ammonium salts derived from cinchonine or cinchonidine bridging N, N′-bis(ethyl)-4-(methyl)-phenyl-amine moiety are used as a chiral phase transfer catalysts for the asymmetric alkylation of a N-(diphenylmethylene)glycine tert-butyl ester with very good chemical yield (up to 97%) and ee's (up to 98%).
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