Unsymmetrical terdentate phosphorus-nitrogen-nitrogen (PNN) ligands: effect of the M/L ratio and the pendant group on stereoselectivity

被引：10

作者：

Cheng, XH ^{[1
]}

Hii, KK ^{[1
]}

机构：

[1] Kings Coll London, Dept Chem, Strand, London WC2R 2LS, England

来源：

TETRAHEDRON-ASYMMETRY | 2003年 / 14卷 / 14期

关键词：

D O I：

10.1016/S0957-4166(03)00361-6

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

Twelve novel, unsymmetrical terdentate pyrrolidine-based phosphorus-nitrogen ligands were prepared. These ligands promoted very high catalytic activity in the palladium-catalysed allylic substitution reactions of 1,3-diphenylpropenyl acetate with malonate esters (100% conversion at 0degreesC in <2 h). Enantioselectivities up to 94% were attained. An unusual effect of metal-to-ligand ratio was observed. Various structural features affecting the enantioselectivity and stereoinduction were examined and discussed. (C) 2003 Elsevier Ltd. All rights reserved.

引用

页码：2045 / 2052

页数：8

共 13 条

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