Selective C(sp3)-C(sp2) bond construction is of central interest in chemical synthesis. Despite the success of classic cross-coupling reactions, the cross-dehydrogenative coupling between inert C(sp3)-H and C(sp2)-H bonds represents an attractive alternative toward new C(sp3)-C(sp2) bonds. Herein, we establish a selective inter- and intramolecular C(sp3)-H arylation of alcohols with nondirected arenes
Harnessing Stereospecific <i>Z</i>-Enamides through Silver-Free Cp*Rh(III) Catalysis by Using Isoxazoles as Masked Electrophiles
作者:Suvankar Debbarma、Sourav Sekhar Bera、Modhu Sudan Maji
DOI:10.1021/acs.orglett.8b04130
日期:2019.2.1
The stereospecificsynthesis of Z-enamides is described in this paper. For the first time, isoxazoles have been employed as electrophiles in C–H functionalization to afford thermodynamically less stable Z-enamides utilizing salicylaldehydes in an atom- and step-economic fashion. The stereochemistry of enamides might originate from the relative disposition of atoms present in isoxazole and the intramolecular
Zinc-Catalyzed Enantioselective Hydrosilylation of Ketones and Imines under Solvent-Free Conditions
作者:Marcin Szewczyk、Agata Bezłada、Jacek Mlynarski
DOI:10.1002/cctc.201601140
日期:2016.12.7
The zinc acetate promoted asymmetric hydrosilylation of various ketones and imines under solvent‐free conditions was examined by using an unprecedented low catalyst loading. Exposure of ketones to 0.05 mol % Zn‐based chiral diamine complex in the presence of triethoxysilane afforded enantioenriched alcohols in excellent yields (up to 98 %) and enantioselectivities (up to 97 % ee). This methodology
Enantioselective Reduction of Ketones and Imines Catalyzed by (CN-Box)ReV-Oxo Complexes
作者:Kristine A. Nolin、Richard W. Ahn、Yusuke Kobayashi、Joshua J. Kennedy-Smith、F. Dean Toste
DOI:10.1002/chem.201001164
日期:2010.8.16
application of chiral, non‐racemic ReV–oxo complexes to the enantioselectivereduction of prochiral ketones is described. In addition to the enantioselectivereduction of prochiral ketones, we report the application of these complexes to 1) a tandem Meyer–Schuster rearrangement/reduction to access enantioenriched allylic alcohols and 2) the enantioselectivereduction of imines.
描述了手性非外消旋 Re V - oxo 配合物在前手性酮的对映选择性还原中的开发和应用。除了前手性酮的对映选择性还原外,我们还报告了这些复合物在以下方面的应用:1)串联 Meyer-Schuster 重排/还原以获取对映体富集的烯丙醇和 2)亚胺的对映选择性还原。
Enantioselective synthesis of β-substituted chiral allylic amines via Rh-catalyzed asymmetric hydrogenation
作者:Qingli Wang、Wenchao Gao、Hui Lv、Xumu Zhang
DOI:10.1039/c6cc06047a
日期:——
Rh-DuanPhos complex-catalyzed asymmetrichydrogenation of [small alpha]- alkenyl substituted enamides has been developed, which provides a readily accessible approach to chiral allylic amines with excellent enantioselectivities and high regioselectivities. The products...