C–H Amination via Electrophotocatalytic Ritter-type Reaction
作者:Tao Shen、Tristan H. Lambert
DOI:10.1021/jacs.1c03718
日期:2021.6.16
A method for C–H bond amination via an electrophotocatalytic Ritter-type reaction is described. The reaction is catalyzed by a trisaminocyclopropenium (TAC) ion in an electrochemical cell under irradiation. These conditions convert benzylic C–H bonds to acetamides without the use of a stoichiometric chemical oxidant. A range of functionality is shown to be compatible with this transformation, and several
A straightforward strategy for direct benzylic C–H bond amination via an electrochemical Ritter-type reaction is developed. The reaction demonstrates simpler and milder reaction conditions over the existing methods without extra mediator. Moderate to excellent yields up to 94% of the desired amide products were obtained with a broad substrate scope. The removal of the Ac group by a simple step can
A General Photocatalytic Strategy for Nucleophilic Amination of Primary and Secondary Benzylic C–H Bonds
作者:Madeline E. Ruos、R. Garrison Kinney、Oliver T. Ring、Abigail G. Doyle
DOI:10.1021/jacs.3c04912
日期:2023.8.23
intercepted by a variety of N-centered nucleophiles, including nitriles (Ritter reaction), amides, carbamates, sulfonamides, and azoles, for the construction of pharmaceutically relevant C(sp3)–N bonds under unified reaction conditions. Mechanistic studies indicate that HAT is amidyl radical-mediated and that the photocatalyst operates via a reductive quenching pathway. These findings establish a mild, metal-free
[EN] CATALYTIC ASYMMETRIC HYDROGENATION, HYDROFORMYLATION, AND HYDROVINYLATION VIA TRANSITION METAL CATALYSTS WITH PHOSPHINES AND PHOSPHITES<br/>[FR] HYDROGENATION CATALYTIQUE ASYMETRIQUE, HYDROFORMULATION, ET HYDROVINYLATION VIA DES CATALYSEURS A METAUX DE TRANSITION AVEC PHOSPHINES ET PHOSPHITES
申请人:THE PENN STATE RESEARCH FOUNDATION
公开号:WO1999059721A1
公开(公告)日:1999-11-25
(EN) Novel transition metal catalysts with conformationally rigid chiral phosphines and phosphites are developed for asymmetric carbon-hydrogen and carbon-carbon bond formation. The invention emphasizes synthesis of chiral amines, $g(b)-amino acids and related compounds via catalytic asymmetric hydrogenation based on chiral monodentate and bidentate phosphines with cyclic ring structures. The ligands contain rigid ring structures.(FR) L'invention concerne l'élaboration de catalyseurs à métaux avec phosphines et phosphites de forme chirale à rigidité conformationnelle, pour la formation de liaisons asymétriques carbone-hydrogène et carbone-carbone. L'invention porte en particulier sur la synthèse d'amines chirales, de bêta-aminoacides et de composés connexes par hydrogénation catalytique asymétrique reposant sur des phosphines chirales monodentées et bidentées qui présentent des structures à noyau cyclique. Les ligands présentent des structures à noyau rigide.