Construction of pseudo-heterochiral and homochiral di-μ-oxotitanium(Schiff base) dimers and enantioselective epoxidation using aqueous hydrogen peroxide

被引：134

作者：

Matsumoto, K ^{[1
]}

Sawada, Y ^{[1
]}

Saito, B ^{[1
]}

Sakai, K ^{[1
]}

Katsuki, T ^{[1
]}

机构：

[1] Kyushu Univ, Fac Sci, Grad Sch, Dept Chem,Higashi Ku, Fukuoka 8128581, Japan

来源：

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION | 2005年 / 44卷 / 31期

关键词：

asymmetric catalysis; enantioselectivity; epoxiclation; hydrogen peroxide; titanium;

D O I：

10.1002/anie.200501318

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

(Chemical Equation Presented) Salen's lot: Meerwein-Ponndorf-Verley reduction of [Ti(salen) (OiPr)2] (salen = bis(salicylidene) ethylenediaminato) complexes followed by treatment with water leads to the synthesis of pseudo-heterochiral and homochiral di-μ-oxotitanium dimers. These dimers, in particular (aR,S,Δ,aR,S,Δ)-dimer 1, efficiently catalyze the epoxidation of simple olefins using aqueous hydrogen peroxide (see scheme) with ee values up to 99% and turnover numbers up to 4600. © 2005 Wiley-VCH Verlag GmbH & Co. KGaA.

引用

页码：4935 / 4939

页数：5

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