Pd-catalyzed asymmetric carboetherification of γ,δ-alkenyl oximes with (hetero)aryl and alkenyl halides in the presence of a commercially available bisphosphine ligand. The enantioenriched products can be facilely converted to functionalized alcohols with high fidelity of chiral transfer.
remains underdeveloped. Herein we report the copper-catalyzed Cope-type hydroamination of oximes with pendant nonactivated olefins, which enables facile access to a series of five- and six-membered cyclic nitrones under mild conditions. In this study, heterocycle-tethered oximes were employed in the Cope-type hydroaminationreaction for the first time. High enantioselectivity was achieved for carbon-tethered
Herein we describe a nickel-catalyzed remote hydrosilylation of unconjugated enones with bulky triphenylsilane. A range of Z-silyl enolethers are obtained as major isomers due to the process of nickel triggered alkene isomerization. Notably, some specific alkyl silyl enolethers can be prepared from this protocol, which are not easily accessed by the traditional strategy using a strong base and chlorosilane
Cobalt-Catalyzed Stereoselective Synthesis of 2,5-<i>trans</i>-THF Nitrile Derivatives as a Platform for Diversification: Development and Mechanistic Studies
作者:Sajjad Ali、Henrique Milanezi、Tânia M. F. Alves、Cláudio Francisco Tormena、Marco A. B. Ferreira
DOI:10.1021/acs.joc.8b00575
日期:2018.8.3
straightforward protocol integrating a sustainable approach for the synthesis of new 2,5-trans-THF nitrile derivatives enabling an easy diversification of its side chain scaffolds is described. The reaction tolerated different aromatic and alkyl substituents, affording the corresponding 2,5-trans-THFs in high diastereoselectivity. A detailed mechanisticstudy using DFT calculation reveals details of the ligand-exchange
The visible-light-promoted difunctionalization of alkenyl ketones has been developed for easyaccess of various tetralones, cyclopropane, or alkenyl migration compounds. With fac-[Ir(ppy)3] as the photocatalyst, alkenyl ketones captured the α-carbonyl alkyl radical and evolved through intramolecular cyclization and the elimination of a proton to give the difunctionalized products. This strategy is