Investigating N-methoxy-N′-aryl ureas in oxidative C–H olefination reactions: an unexpected oxidation behaviour
作者:Jens Willwacher、Souvik Rakshit、Frank Glorius
DOI:10.1039/c1ob05636k
日期:——
Herein, we report a urea derived directing group for mild and highly selective oxidative CâH bond olefination. Subsequent intramolecular Michael addition affords dihydroquinazolinones in good yields. The NâO bond of the urea substrate exhibits superior oxidative behaviour compared to a variety of other external oxidants.
Phenyl Isocyanate Anion Radicals and Their Cyclotrimerization to Triphenyl Isocyanurate Anion Radicals
作者:Mark A. Servos、Nathaniel C. Smart、Mark E. Kassabaum、Cody A. Scholtens、Steven J. Peters
DOI:10.1021/jo4003008
日期:2013.4.19
Room-temperature sodium metal reduction of phenyl isocyanate (PhNCO) in hexamethylphosphoramide yields the anionradical (PhNCO•–) where the unpaired electron exhibits coupling to one nitrogen and five unique protons. The extent of coupling to the carbon in the NCO group was obtained via the reduction of 13C-labeled PhN13CO. Remarkably, this coupling is over 2 orders of magnitude smaller than that
Transformable Transient Directing Group-Assisted C(sp<sup>2</sup>)–H Activation: Synthesis and Late-Stage Functionalizations of <i>o</i>-Alkenylanilines
作者:Bubul Das、Anjali Dahiya、Ashish Kumar Sahoo、Bhisma K. Patel
DOI:10.1021/acs.joc.2c01626
日期:2022.10.7
The isocyanate group in aryl isocyanates serves as a transformable transientdirectinggroup in a Ru(II)-catalyzed ortho olefination leading to o-alkenylanilines. In alcoholic solvents, aryl isocyanates are transformed into carbamates, which initiate the insertion of acrylates via o-C–H activation. In particular, tAmOH serves the dual role of solvent-cum transientdirecting mediator. The o-alkenylanilines
Methods and apparatuses for gel-free qualitative and quantitative proteome analysis, and uses therefore
申请人:——
公开号:US20040005633A1
公开(公告)日:2004-01-08
Methods and apparatus for qualitative and quantitative proteome analysis are provided. The methods and apparatus allow for the isolation of a subset of peptides out of complex mixtures of peptides. The isolation is based on a specific chemical and/or enzymatic alteration of one or more types of peptides. This alteration modifies the biophysical, chemical or any other biochemical property of the affected types of peptides (e.g., net electrical charge and/or hydrophobicity) in such way that the altered peptides can be separated from the unaltered peptides.
Methods and apparatus for gel-free qualitative and quantitative proteome analysis, and uses therefore
申请人:Vandekerckhove Joel
公开号:US20050196823A1
公开(公告)日:2005-09-08
Methods and apparatus for qualitative and quantitative proteome analysis are provided. The methods and apparatus allow for the isolation of a subset of peptides out of complex mixtures of peptides. The isolation is based on a specific chemical and/or enzymatic alteration of one or more types of peptides. This alteration modifies the biophysical, chemical or any other biochemical property of the affected types of peptides (e.g., net electrical charge and/or hydrophobicity) in such way that the altered peptides can be separated from the unaltered peptides.