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。
Enantioselective Cu-Catalyzed Conjugate Addition of Diethylzinc to Acyclic Aliphatic Enones
作者:Andrew P. Duncan、James L. Leighton
DOI:10.1021/ol048191o
日期:2004.10.1
[reaction: see text] A new P-chiral phosphine bis(sulfonamide) ligand has been developed that allows the Cu-catalyzed enantioselectiveconjugateaddition of Et(2)Zn to acyclic aliphatic enones. The reactions proceed with excellent levels of enantioselectivity (90-95% ee) with a range of enone substrates, involve the use of only 1.2 equiv of Et(2)Zn, and give best results at ambient temperature.
Vasi,I.G.; Desai,R.K., Journal of the Indian Chemical Society, 1975, vol. 52, p. 89 - 90
作者:Vasi,I.G.、Desai,R.K.
DOI:——
日期:——
Vasi,I.G.; Desai,R.K., Journal of the Indian Chemical Society, 1971, vol. 48, p. 883 - 885
作者:Vasi,I.G.、Desai,R.K.
DOI:——
日期:——
Enantioselective copper-catalyzed conjugate addition using chiral diaminocarbene ligands
作者:Frédéric Guillen、Caroline L. Winn、Alexandre Alexakis
DOI:10.1016/s0957-4166(01)00387-1
日期:2001.8
Chiral diaminocarbene ligands, generated by in-situ deprotonation of the corresponding chiral imidazolinium salts, are shown to be efficient ligands in the asymmetric copper-catalyzed 1,4-conjugate addition of diethylzinc to enones, allowing enantiomeric excesses of up to 51% to be achieved. (C) 2001 Elsevier Science Ltd. All rights reserved.