A versatile and site-selective rhodium(III)-catalyzed aerobic oxidativealkenylation of arylacetamides including primary, secondary, and tertiary amides having a weak O-coordinating acetamide directing group with alkenes is described. In the reaction, air was utilized as a sole oxidant. The reaction was compatible with activated alkenes and maleimides.
The C–H alkylation of arylacetamides with activated alkenes such as substituted acrylates and vinylsulphone in the presence of a ruthenium catalyst and organic acid via the weak O-coordination under the redox free version is described. The present protocol was effective with different substituted arylacetamides including secondary and tertiary amides. The reaction mechanism including the ortho C–H
Correction to “Photoenzymatic Reductions Enabled by Direct Excitation of Flavin-Dependent ‘Ene’-Reductases”
作者:Braddock A. Sandoval、Phillip D. Clayman、Daniel G. Oblinsky、Seokjoon Oh、Yuji Nakano、Matthew Bird、Gregory D. Scholes、Todd K. Hyster
DOI:10.1021/jacs.1c01618
日期:2021.3.10
the Division of Chemical Sciences, Geosciences, and Biosciences, Office of Basic Energy Sciences of the U.S. Department of Energy (DOE) through grant DE-SC0019370. Use of the Laser Electron Accelerator Facility (LEAF) of the BNL Accelerator Center for Energy Research (ACER) was supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, Division of Chemical Sciences
Anodic amide oxidations in the presence of electron-rich phenyl rings: evidence for an intramolecular electron-transfer mechanism
作者:Kevin D. Moeller、Po W. Wang、Sharif Tarazi、Mohammad R. Marzabadi、Poh Lee Wong
DOI:10.1021/jo00003a029
日期:1991.2
The anodic oxidations of amides in the presence of mono-, di-, and trialkoxyphenyl rings were examined. Although literature reduction potentials suggest that these oxidations would lead to either selective aromatic ring oxidation or mixtures, the chemoselectivity of the reactions was found to be dependent on the substitution pattern of the phenyl ring. For example, the anodic oxidations of ((3-methoxyphenyl)acetyl)pyrrolidine, ((2-methoxyphenyl)acetyl)pyrrolidine, ((3-methoxy-4-(pivaloyloxy)phenyl)acetyl)pyrrolidine, and ((3,5-dimethoxy-4-(pivaloyloxy)phenyl)acetyl)pyrrolidine all led to selective methoxylation of the pyrrolidine ring. The anodic oxidations of ((4-methoxyphenyl)acetyl)pyrrolidine and ((3,4-methoxyphenyl)acetyl)pyrrolidine led to selective methoxylation of the benzylic carbon. Mechanistic studies indicate that both amide and aryl oxidation processes compete under the reaction conditions, but that intramolecular electron transfer leads to the selective formation of products. Evidence for this mechanism was obtained by examining the cyclic voltammogram of ((3-methoxyphenyl)-acetyl)pyrrolidine, competition studies, and the preparative electrolysis of ((4-methoxyphenyl)dimethyl-acetyl)pyrrolidine. The methoxylated amides were cyclized to form tricyclic amides using titanium tetrachloride.
Electrochemical amide oxidations in the presence of monomethoxylated phenyl rings. An unexpected relationship between the chemoselectivity of the oxidation and the location of the methoxy substituent
作者:Kevin D. Moeller、Tarazi Sharif、Marzabadi Mohammad R