Ruthenium-Catalyzed C–H Hydroxylation in Aqueous Acid Enables Selective Functionalization of Amine Derivatives
作者:James B. C. Mack、John D. Gipson、J. Du Bois、Matthew S. Sigman
DOI:10.1021/jacs.7b05469
日期:2017.7.19
catalytic protocol for sp3 C-H hydroxylation is described. Reactions are performed in aqueous acid using a bis(bipyridine)Ru catalyst to enable oxidation of substrates possessing basic amine functional groups. Tertiary and benzylic C-H hydroxylation is strongly favored over N-oxidation for numerous amine derivatives. With terpene-derived substrates, similar trends in reactivity toward tertiary and benzylic
Oxaziridine-Mediated Catalytic Hydroxylation of Unactivated 3° C−H Bonds Using Hydrogen Peroxide
作者:Benjamin H. Brodsky、J. Du Bois
DOI:10.1021/ja055549i
日期:2005.11.1
The design, structural characterization, and evaluation of a unique class of 1,2,3-benzoxathiazine-based oxaziridines as potent O-atom transfer agents for catalytic C−H hydroxylation and alkene epoxidation are described. Turnover of this reaction is made possible by employing a diaryl diselenide cocatalyst and urea·H2O2 as the terminal oxidant. Oxidation of saturated hydrocarbons is strongly biased
We report the first examples of ruthenium complexes cis-[(N4)RuIIICl2]+ and cis-[(N4)RuII(OH2)2]2+ supported by chiral tetradentate amine ligands (N4), together with a high-valent cis-dioxo complex cis-[(N4)RuVI(O)2]2+ supported by the chiral N4 ligand mcp (mcp = N,N′-dimethyl-N,N′-bis(pyridin-2-ylmethyl)cyclohexane-1,2-diamine). The X-ray crystal structures of cis-[(mcp)RuIIICl2](ClO4) (1a), cis-
我们报告了由手性四齿胺配体 (N 4 ) 支持的钌配合物cis -[(N 4 )Ru III Cl 2 ] +和cis -[(N 4 )Ru II (OH 2 ) 2 ] 2+的第一个例子,与手性N 4配体mcp ( mcp = N , N ' -二甲基-N _, N'-双(吡啶-2-基甲基)环己烷-1,2-二胺)。cis -[(mcp)Ru III Cl 2 ](ClO 4 ) ( 1a )、cis -[(Me 2 mcp)Ru III Cl 2 ]ClO 4 ( 2a ) 和cis -[(pdp )的 X 射线晶体结构)Ru III Cl 2 ](ClO 4 ) ( 3a ) (Me 2 mcp = N , N '-二甲基-N , N'-双((6-甲基吡啶-2-基)甲基)环己烷-1,2-二胺, pdp = 1,1'-双(吡啶-2-基甲基)-2,2'-联吡咯烷))配体以顺式-α构型与钌中心配位。在水溶液中,观察到cis
An Iminium Salt Organocatalyst for Selective Aliphatic C–H Hydroxylation
作者:Daoyong Wang、William G. Shuler、Conor J. Pierce、Michael K. Hilinski
DOI:10.1021/acs.orglett.6b01832
日期:2016.8.5
salt are presented. The method allows the selective organocatalytic hydroxylation of unactivated 3° C–H bonds at room temperature usinghydrogenperoxide as the terminal oxidant. Hydroxylation of an unactivated 2° C–H bond is also demonstrated. Furthermore, improved functional group compatibility over other catalytic methods is reported in the form of selectivity for aliphatic C–H hydroxylation over alcohol
performance of highly efficient aliphaticamines racemization, under mild conditions at 30 °C. The reaction proceeds via the reversible generation of prochiral α-aminoalkyl radicals. The latter may result either from a redox process between the thiyl radical and the amine or from direct hydrogen atom abstraction by thiyl radical. As hydrogen atom donor, the thiol plays a crucial role. While the racemization