Catalyticenantioselective chemical reactions involving highly reactive radical species remain largely unexplored. We report herein for the first time a novel enantioselective radical ring-opening cyanation of redox-active oxime esters by dual photoreodox and copper catalysis. This mild protocol shows good functional group tolerance and broad substrate scope, producing a wide range of optically active
Olefin-Migrative Cleavage of Cyclopropane Rings through the Nickel-Catalyzed Hydrocyanation of Allenes and Alkenes
作者:Hiroto Hori、Shigeru Arai、Atsushi Nishida
DOI:10.1002/adsc.201601400
日期:2017.4.3
A nickel‐catalyzed hydrocyanation triggered by hydronickelation of the carbon‐carbon double bonds of allenes followed by cyclopropane cleavage is described. The observed regio‐ and stereochemistries in the products are strongly influenced by the initial hydronickelation step, and allenyl‐ and methylenecyclopropanes reacted smoothly to promote the cleavage of cyclopropane. In contrast, this cleavage
Cu-Catalyzed Redox-Neutral Ring Cleavage of Cycloketone <i>O</i>-Acyl Oximes: Chemodivergent Access to Distal Oxygenated Nitriles
作者:Wenying Ai、Yaqian Liu、Qian Wang、Zhonglin Lu、Qiang Liu
DOI:10.1021/acs.orglett.7b03707
日期:2018.1.19
chemodivergent copper-catalyzed ring opening of cycloketone oximes via radical-mediated C–C bond cleavage under redox-neutral conditions is described. This method allows the divergent synthesis of γ- and δ-acyloxylated, alkoxylated, and hydroxylated nitriles while avoiding the use of toxic cyanide reagents. Moreover, these reactions proceed under very mildconditions with good functional group tolerance
nickel-catalyzed cine-arylation of tert-cyclobutanols with indoles to access β-aryl ketones with an unusual site-selectivity at the C3-position of tert-cyclobutanols. The reaction features earth-abundant nickelcatalysis, excellent regioselectivity, high atom-economy, and broad substrate scope.
Rh(III)-Catalyzed Stereoselective C–C Bond Cleavage of ACPs with <i>N</i>-Phenoxyacetamides: The Critical Role of the Nucleophilic Directing Group
作者:Anurag Singh、Arnab Dey、Chandra M. R. Volla
DOI:10.1021/acs.joc.1c01135
日期:2021.8.6
phenols in nonpolar solvents, whereas [3 + 2]-annulation leading to dihydrobenzofurans was realized in polar fluorinated solvents. It was observed that the nucleophilic directing group controls the elimination of β-carbon and so plays a vital role for achieving high stereoselectivities. The synthetic utility of the dienylation and annulation was demonstrated by carrying out gram scale reactions and further