Asymmetric α-amination of chiral protected β-hydroxyaldehydes catalyzed by proline

Thus, the use of oxygenated solvents cancels such hydrogen interactions by their stronger donor character and makes the diastereomers separation possible, allowing

These ruthenium nanoparticles intercalated in hectorite are highly active and selective hydrogenation catalysts: Ruthenium(0)- containing hectorite 3 efficiently reduces different ␣ ,

Pour être transmis, le message doit passer successivement par les n relais.. Au passage de chaque relais, chaque bit du message a une probilité α

Abstract: Investigations based on NMR, MS and DFT studies shed light on the metallic species generated in the rhodium- catalyzed asymmetric [2+2+2]

[7] In our program dedicated to the development of solvent-free methods in the area of pep- tide and amino acid chemistry [8] and because, to the best of our knowledge,

29 Herein, we describe a readily available copper(I) catalytic system generated from bisoxazoline ligands bearing a chiral dihydroethanoanthracene backbone (L*) (Fig. 1) and CuOTf

28 As a new development of our previous catalytic studies on N-H insertion of diazoesters, 29-31 we describe herein a copper- catalyzed asymmetric O-H insertion reaction into

77 In the case of ethylene addition to the fluoro-adduct, the yield (80%) and the selectivity (81:19) were improved, in comparison with reactions with HBO (66%, 66:34), whereas the