Asymmetric Epoxidation of α,β-Unsaturated Ketones Catalyzed by Chiral Polybinaphthyl Zinc Complexes:  Greatly Enhanced Enantioselectivity by a Cooperation of the Catalytic Sites in a Polymer Chain (original) (raw)

The Journal of Organic Chemistry, 1999

Wei-sheng Huang

Stanley Roberts

Qiao-sheng Hu

Lin Pu

Jie Tang

G. Zou

Xiaofan Zheng

Shigeru Arai

Qun Chen

Abstract

Polybinaphthyl zinc catalysts have been developed for the asymmetric epoxidation of α, β-unsaturated ketones in the presence of tert-butyl hydroperoxide. Up to 81% ee has been achieved for the epoxidation of α, β-unsaturated ketones containing β-aliphatic ...

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