The Mechanism of Rhodium-Catalyzed Allylic C–H Amination
作者:Robert J. Harris、Jiyong Park、Taylor A. F. Nelson、Nafees Iqbal、Daniel C. Salgueiro、John Bacsa、Cora E. MacBeth、Mu-Hyun Baik、Simon B. Blakey
DOI:10.1021/jacs.0c01069
日期:2020.3.25
Herein the mechanism of catalytic allylic C-H aminationreactions promoted by Cp*Rh complexes is reported. Reaction kinetics experiments, stoichiometric studies, and DFT calculations demonstrate that the allylic C-H activation to generate a Cp*Rh(π-allyl) complex is viable under mild reaction conditions. The role of external oxidants in the catalytic cycle is elucidated. Quantum mechanical calculations
Direct Alkylation of Amines with Alcohols Catalyzed by Base
作者:Qiang-Qiang Li、Zu-Feng Xiao、Chuan-Zhi Yao、Hong-Xing Zheng、Yan-Biao Kang
DOI:10.1021/acs.orglett.5b02685
日期:2015.11.6
A base-catalyzed/promoted transition-metal-free direct alkylation of amines with alcohols has been developed, giving the desired amines in generally high yields from either aromatic or aliphatic alcohols. On the basis of the 1H NMR and in situ IR (React-IR) monitoring experiments, isotope-labeling experiments, as well as control experiments, a novel “hemiaminal” model is proposed to understand the
已经开发了胺与醇的碱催化/促进的无过渡金属的直接烷基化反应,从芳香族或脂族醇中以通常高收率得到所需的胺。在1 H NMR和原位红外(React-IR)监测实验,同位素标记实验以及对照实验的基础上,提出了一种新颖的“半血友病”模型以了解其机理,从而解释了该机理的形成。反应中“多余”的醛。
Diastereoselective Conjugate Addition to (+)-Camphorsulfonic Acid Derived Nitroalkenes: Synthesis of α-Hydroxy and α-Amino Acids
作者:Anthony G. M. Barrett、D. Christopher Braddock、Paul W. N. Christian、Daniel Pilipauskas、Andrew J. P. White、David J. Williams
DOI:10.1021/jo980582r
日期:1998.8.1
Diastereoselective tandem conjugateaddition of both oxygen- and nitrogen-centered nucleophiles to the novel (1S)-10-camphorsulfonic acid derivednitroalkenes 9, 10, and 11 and ozonolysis gave the alpha-hydroxy and alpha-amino thiol acid derivatives 12, 13, and 14. In all cases, the (R)-diastereomer was formed as the major component albeit with only modest levels of selectivity (33-71% de). The structures
An Isolable Terminal Imido Complex of Palladium and Catalytic Implications
作者:Annette Grünwald、Nicole Orth、Andreas Scheurer、Frank W. Heinemann、Alexander Pöthig、Dominik Munz
DOI:10.1002/anie.201809152
日期:2018.12.3
Herein, we report the isolation and a reactivity study of the first example of an elusive palladium(II) terminalimido complex. This scaffold is an alleged key intermediate for various catalytic processes, including the amination of C−H bonds. We demonstrate facile nitrene transfer with H−H, C−H, N−H, and O−H bonds and elucidate its role in catalysis. The high reactivity is due to the population of
The present invention relates to novel bis-sulfonamides represented, for example, by formula I below and a pure diastereomer, a mixture of diastereomers, a diastereomeric racemate, a mixture of diastereomeric racemates and meso-forms and a pharmaceutically acceptable salt thereof, wherein R1 represents aryl; aryl-lower alkyl; aryl-lower alkenyl; heteroaryl; or heteroaryl-lower alkyl; and R2 represents lower alkyl; trifluoromethyl; lower alkoxy-lower alkyl; lower alkenyl; lower alkynyl; aryl; aryl-lower alkyl; aryl-lower alkenyl; heterocyclyl; heterocyclyl-lower alkyl; heteroaryl; heteroaryl-lower alkyl; cycloalkyl; or cycloalkyl-lower alkyl. The present invention also relates to a process for manufacturing those compounds, pharmaceutical compositions containing one or more of those compounds as endothelin antagonists, and a method of treating a subject having a disorder involving endothelin with the compounds of
the invention.