Enantiospecific CH Activation Using Ruthenium Nanocatalysts
作者:Céline Taglang、Luis Miguel Martínez-Prieto、Iker del Rosal、Laurent Maron、Romuald Poteau、Karine Philippot、Bruno Chaudret、Serge Perato、Anaïs Sam Lone、Céline Puente、Christophe Dugave、Bernard Rousseau、Grégory Pieters
DOI:10.1002/anie.201504554
日期:2015.9.1
The activation of CH bonds has revolutionized modern synthetic chemistry. However, no general strategy for enantiospecificCHactivation has been developed to date. We herein report an enantiospecificCHactivation reaction followed by deuterium incorporation at stereogenic centers. Mechanistic studies suggest that the selectivity for the α‐position of the directing heteroatom results from a four‐membered
Catalytic Stereoinversion of<scp>L</scp>-Alanine to Deuterated<scp>D</scp>-Alanine
作者:Kimia Moozeh、Soon Mog So、Jik Chin
DOI:10.1002/anie.201503616
日期:2015.8.3
developed for catalytic deuteration of L‐alanine with inversion of stereochemistry to give deuterated D‐alanine under mild conditions (neutral pD and 25 °C) without the use of any protecting groups. This system can also be used for catalytic deuteration of D‐alanine with retention of stereochemistry to give deuterated D‐alanine. Thus a racemic mixture of alanine can be catalytically deuterated to give
Enantioselective synthesis of α-deuterium labelled chiral α-amino acids via dynamic kinetic resolution of racemic azlactones
作者:Joong-Suk Oh、Kyung Il Kim、Choong Eui Song
DOI:10.1039/c1ob06319g
日期:——
Catalytic dynamickineticresolution (DKR) of racemic azlactones with EtOD using squaramide-based dimeric cinchona alkaloid organocatalysts is shown to be a highly effective strategy for the preparation of enantiomerically pure α-deuterated chiral α-amino acids.
An atom-efficient and stereoselective synthesis has been developed for the preparation of α-2H-labelled (S)-α-amino acids, starting from a novel chiral diketopiperazine scaffold. Efficient mono-alkylation of the chiral template afforded the (S)-substituted adducts with the nature of the electrophile significantly effecting the stereochemical outcome. Subsequent alkylation was totally selective producing
Exploring Radical Migration Pathways in Peptides with Positional Isomers, Deuterium Labeling, and Molecular Dynamics Simulations
作者:Xing Zhang、Ryan R. Julian
DOI:10.1007/s13361-012-0540-6
日期:2013.4.1
the peptide RGYALG that is sensitive to ortho versus meta or parasubstitution was fully mapped out by a suite of deuterium labeled peptides. This data was then used to optimize parameters in molecular dynamics-based simulations, which were subsequently used to obtain further insight into the structural underpinnings that most strongly influence the kinetics of radical migration. Open image in new