Mechanistic Interrogation of Alkyne Hydroarylations Catalyzed by Highly Reduced, Single-Component Cobalt Complexes
作者:Benjamin A. Suslick、T. Don Tilley
DOI:10.1021/jacs.0c04072
日期:2020.6.24
complexes. Studies of the stoichiometric reaction of Co(I) or Co(II) precursors with CyMgCl implicated catalyst initiation via a β-H elimination/deprotonation pathway. The resulting single-component Co(-I) complex is proposed as the direct precatalyst. Michaelis-Menten enzyme kineticstudies provide mechanistic details regarding the catalytic dependence on substrate. The (N-aryl)aryl ethanimine substrate
Olefin Hydroarylation Catalyzed by a Single-Component Cobalt(-I) Complex
作者:Benjamin A. Suslick、T. Don Tilley
DOI:10.1021/acs.orglett.1c00258
日期:2021.2.19
has been developed for olefinhydroarylations with (N-aryl)aryl imine substrates. More than 40 examples were examined under mild reaction conditions to afford the desired alkyl-arene product in good to excellent yields. Catalysis occurs in a regioselective manner to afford exclusively branched products with styrene-derived substrates or linear products for aliphatic olefins. Electron-withdrawing functional
<i>S</i>-Chiral Sulfinamides as Highly Enantioselective Organocatalysts
作者:Dong Pei、Zhouyu Wang、Siyu Wei、Yu Zhang、Jian Sun
DOI:10.1021/ol062633+
日期:2006.12.1
accessible chiral sulfinamide 2 has been developed as the first highly efficient and enantioselectiveorganocatalyst relying solely on a chiral sulfur center for stereochemical induction. In the presence of 20 mol % of 2, a broad range of N-aryl ketimines 1 were reduced by trichlorosilane to produce amines 3 in high yield and enantioselectivity. [reaction: see text]
Asymmetric reduction of ketimines with trichlorosilane employing an imidazole derived organocatalyst
作者:François-Moana Gautier、Simon Jones、Stephen J. Martin
DOI:10.1039/b816051a
日期:——
Organocatalysts for the asymmetric reduction of ketimines are presented that function well at low catalyst loadings providing chiral amines in good yield and enantioselectivity, the latter appearing to be independent of the ketimine substrate geometry.
Solid Supported Chiral <i>N</i>
-Picolylimidazolidinones: Recyclable Catalysts for the Enantioselective, Metal- and Hydrogen-Free Reduction of Imines in Batch and in Flow Mode
organocatalysts for the catalytic reduction of imines with trichlorosilane has been developed. Polystyrene proved to be a more effective support than silica in terms of both chemical and stereochemical efficiency. Even with a loading as low as 1 mol% the best performing supported catalyst showed a remarkable activity and stereocontrol ability, promoting the reduction with stereoselectivities reaching 98% ee and