- Cinchona alkaloid-based polymer-bound phase-transfer catalysts: efficient enantioselective alkylation of benzophenone imine of glycine esters.
Cinchona alkaloid-based polymer-bound phase-transfer catalysts: efficient enantioselective alkylation of benzophenone imine of glycine esters.
Molecular diversity (2005-11-29)
Baptiste Thierry, Jean-Christophe Plaquevent, Dominique Cahard
PMID16311803
RESUMEN
Cross-linked polystyrene-bound and poly(ethylene glycol)-bound phase-transfer catalysts as well as homopolymers of cinchona alkaloid derivatives have been synthesised. Both soluble and insoluble polymers have been investigated. The enantioselective alkylation of N-diphenyl methylene glycine t-butyl ester has been successfully carried out in heterogeneous and homogeneous systems. High enantioselectivities (up to 96%) have been obtained. The polymer-bound catalysts have been easily recovered and conditions for efficient recycling have been studied.
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