aliphatic alcohols (also as solvent) allow to produce useful α,β-unsaturatedesters in good to excellent yields at 70 °C. Efficient regioselectivity could be controlled in the presence of N-ligands while the P-ligands had no influence on the conversion of substrates and the chemo/regioselectivity of target products. By involving N-ligand 4,7-dimethyl-1,10-phenanthroline in the catalytic system, α,β-unsaturated
The enantioselective carbene insertion into N–H bonds of anilines has been realized by cooperativecatalysis of ruthenium complexes and chiralphosphoricacids, providing the expected α-aryl glycines in moderate to good yields with high enantioselectivity. Typically, by slightly modifying the reaction conditions, this approach allows the N–H bond insertion reaction to be effective for both α-aryl and
LED lighting as a simple, inexpensive, and sustainable alternative for Wolff rearrangements
作者:Barbara Bernardim、Andrea M. Hardman-Baldwin、Antonio C. B. Burtoloso
DOI:10.1039/c4ra15670f
日期:——
The Wolff rearrangement suffers from many drawbacks with respect to its practical execution in the laboratory. Herein, commercial LED lamps are employed as a sustainable alternative for the classic protocols typically used for Wolff rearrangements.
Nickel‐Catalyzed Regio‐ and Enantioselective Ring Opening of 3,4‐Epoxy Amides and Esters with Aromatic Amines
作者:Jiawei Liu、Wei Tang、Chuan Wang
DOI:10.1002/chem.202300704
日期:——
A carbonyl-directed regio- and enantioselective ringopening reaction of 2,3-epoxy amides and esters has been developed by use of a chiral nickel/bipyridine complex as the catalyst.