Oxidation catalysis of Nb (salan) complexes: asymmetric epoxidation of allylic alcohols using aqueous hydrogen peroxide as an oxidant

H Egami, T Oguma, T Katsuki

Index: Egami, Hiromichi; Oguma, Takuya; Katsuki, Tsutomu Journal of the American Chemical Society, 2010 , vol. 132, # 16 p. 5886 - 5895

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Citation Number: 81

Abstract

Several optically active Nb (salan) complexes were synthesized, and their oxidation catalysis was examined. A dimeric μ-oxo Nb (salan) complex that was prepared from Nb (O i Pr) 5 and a salan ligand was found to catalyze the asymmetric epoxidation of allylic alcohols using a urea− hydrogen peroxide adduct as an oxidant with good enantioselectivity. However, subsequent studies of the time course of this epoxidation and of the relationship ...