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。
Efficient Cu-Catalyzed Asymmetric Conjugate Additions of Alkylzincs to Trisubstituted Cyclic Enones
作者:Sylvia J. Degrado、Hirotake Mizutani、Amir H. Hoveyda
DOI:10.1021/ja021081x
日期:2002.11.1
The first examples of efficient catalytic asymmetric conjugate addition (ACA) of alkylzincs to trisubstituted cyclicenones is disclosed. These Cu-catalyzed reactions proceed efficiently with five- and seven-membered ring substrates to afford the desired products in >/=95% ee. Intermediate enolates can be trapped with alkyl halides to generate a quaternary stereogenic center. The requisite chiral ligand
公开了烷基锌与三取代环烯酮的有效催化不对称共轭加成(ACA)的第一个实例。这些铜催化的反应与五元环和七元环底物一起有效地进行,以 >/= 95% ee 提供所需的产物。中间体烯醇可以被烷基卤化物捕获以生成四元立体中心。必需的手性配体由市售材料制备,并且可以原位使用而无需在商业级 (CuOTf)2.PhMe 存在下进一步纯化。
An approach toward the total synthesis of subergorgic acid
作者:John C. Gilbert、Jiandong Yin
DOI:10.1016/j.tet.2008.04.005
日期:2008.6
Ireland–Claisenrearrangement of a substituted alkenyl cyclopentanecarboxylate provided a monocyclic isomer containing the proper stereochemistry for four of the five stereogenic centers in subergorgic acid. Efforts to construct the additional rings in the molecule were thwarted as a result of steric and other factors. The results provide insights regarding the Ireland–Claisenrearrangement in five-membered
Solvents of low nucleophilicity. XII. Triple-bond participation in the acetolysis, formolysis, and trifluoroacetolysis of 6-heptyn-2-yl tosylate and 6-octyn-2-yl tosylate
作者:Paul E. Peterson、Rajaninath J. Kamat
DOI:10.1021/ja01044a035
日期:1969.7
Stereochemistry of the Peracid Oxidation of Ketones<sup>1</sup>