Chiral dinuclear phthalazine bridged bisoxazoline ligands: synthesis and application in enantioselective Cu-catalyzed conjugate addition of ZnEt2 to enones
摘要:
A new class of chiral dinuclear ligands with phthalazine bridged bisoxazoline scaffold was designed and prepared in convenient synthetic routes. H-1 NMR analysis showed that this class of ligands could coordinate with two metal ions, either same or different. These ligands afforded good to excellent yields and enantioselectivities in Cu-catalyzed conjugate addition of ZnEt2 to enones. (C) 2011 Elsevier Ltd. All rights reserved.
Cu-Catalyzed Asymmetric Conjugate Additions of Alkylzinc Reagents to Acyclic Aliphatic Enones
作者:Hirotake Mizutani、Sylvia J. Degrado、Amir H. Hoveyda
DOI:10.1021/ja0122849
日期:2002.2.1
Cu-catalyzed enantioselective conjugate additions to acyclic aliphatic enones are reported. The resulting enolates may be functionalized intra- and intermolecularly, leading to the formation of an additional C-C bond. The utility of the present method is not limited to reactions involving Et2Zn; a variety of alkylzincs may be used. Moreover, many of the requisite substrates can be easily accessed through
报道了铜催化的对映选择性共轭添加到无环脂肪族烯酮。所得的烯醇可以在分子内和分子间进行功能化,从而形成额外的 CC 键。本方法的用途不限于涉及 Et2Zn 的反应;可以使用多种烷基锌。此外,许多必需的底物可以通过催化烯烃交叉复分解轻松获得。