The importance of complex stability for asymmetric copper-catalyzed cyclopropanations in [emim][OTf] ionic liquid:: the bis(oxazoline)-azabis(oxazoline) case

被引：52

作者：

Fraile, JM

García, JI

Herrerías, CI

Mayoral, JA ^{[1
]}

Reiser, O

Vaultier, M

机构：

[1] Univ Zaragoza, CSIC, Fac Ciencias, Inst Ciencia Mat Aragon,Dept Quim Organ, E-50009 Zaragoza, Spain

[2] Univ Regensburg, Inst Organ Chem, D-93053 Regensburg, Germany

[3] Univ Rennes 1, Inst Chim, UMR 6510, F-35042 Rennes, France

来源：

TETRAHEDRON LETTERS | 2004年 / 45卷 / 36期

关键词：

asymmetric catalysis; ionic liquids;

D O I：

10.1016/j.tetlet.2004.07.030

中图分类号：

O62 [有机化学];

学科分类号：

070303 ; 081704 ;

摘要：

Azabis(oxazoline)-Cu complexes are more stable than their analogues based on bis(oxazoline) ligands. This increased stability leads to improved recoverability (up to eight times) when these systems are used in an ionic liquid medium. The solution of the chiral catalyst can even be reused in different enantioselective cyclopropanation reactions and still lead to high enantiomeric excess (>90%). (C) 2004 Elsevier Ltd. All rights reserved.

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页码：6765 / 6768

页数：4

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