作者:Dmitry P. Lubov、Oleg Yu. Lyakin、Denis G. Samsonenko、Tatyana V. Rybalova、Evgenii P. Talsi、Konstantin P. Bryliakov
DOI:10.1039/d0dt02247k
日期:——
complexes with tripodal ligands of the tpa family (tpa = tris(2-pyridylmethyl)amine) have been synthesized and X-ray characterized. These complexes efficiently catalyze benzylic C–H oxidation of various substrates with peraceticacid, affording the corresponding ketones in high yields (up to 100%), at <1 mol% catalyst loadings. Complex [(tpa)Pd(OAc)](PF6) with the least sterically demanding ligand tpa demonstrates
Biocatalytic, Intermolecular C−H Bond Functionalization for the Synthesis of Enantioenriched Amides
作者:Soumitra V. Athavale、Shilong Gao、Zhen Liu、Sharath Chandra Mallojjala、Jennifer S. Hirschi、Frances H. Arnold
DOI:10.1002/anie.202110873
日期:2021.11.15
P411 heme enzymes enables intermolecular C−H amidation with high yields and exquisite enantioselectivity. The biocatalytic process utilizes stable hydroxamate esters as nitrenoid precursors and is amenable to scaleup. Mechanistic studies reveal rate-determining nitrenoid formation followed by a stepwise, hydrogen atom transfer-mediated C−Hfunctionalization.
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
[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.