2005•Chinese Journal of ChemistryRequires access

Recycling Chiral Organocatalyst (4S)‐Phenoxy‐(S)‐proline for Direct Asymmetric Aldol Reaction in Ionic Liquid (bmim)PF6

Yanhua Liu, Ya‐Wen Zhang, Ding Yi‐Ping, Zongxuan Shen, Luo Xiao‐Qing

Abstract

Abstract Room temperature ionic liquid (bmim)PF6 was evaluated for recycling an organocatalyst (4S)‐phenoxy‐(S)‐proline for direct asymmetric aldol reactions. The desired aldol products were obtained with good yields up to 93.2% and enantioselectivities up to 88.5%, and isolation of the products by simple extraction allowed recycling the ionic liquid containing the immobilized catalyst in subsequent reactions without significant decrease of yields and enantioselectivities.

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Key concepts: Chemistry, Aldol reaction, Ionic liquid, Catalysis, Organocatalysis, Proline, Organic chemistry, Extraction (chemistry)