Chirality Transfer in Rhodium(I)-Catalyzed [3 + 2]-Cycloaddition of Vinyl Aziridines and Oxime Ethers: Atom-Economical Synthesis of Chiral Imidazolidines
A highly efficient and stereoselective synthesis of enantioenriched imidazolidines by rhodium-catalyzed intermolecular [3 + 2] cycloaddition reaction of chiral vinyl aziridines and oxime ethers has been successfully developed. Notably, both aldoximes and ketoximes are suitable substrates to afford the corresponding chiral imidazolidines in high yields with good stereoselectivity. This transformation
Pd-Catalyzed Multiple CH Functionalization to Construct Biologically Active Compounds from Aryl Aldoxime Ethers with Arenes
作者:Vedhagiri S. Thirunavukkarasu、Chien-Hong Cheng
DOI:10.1002/chem.201102996
日期:2011.12.23
Functional fluorenones: Aromatic aldoximeethers react with unactivated arenes catalyzed by palladium complexes to give biologicallyactive fluoren‐9‐ones (see scheme). MultipleCH bond activation and an oxidative cyclization are involved in the reaction.
The one-pot de novo synthesis of pentasubstituted pyridines was realized following the process of Au(I)-autotandem catalysis and subsequent aromatization. The process involves aza–enyne metathesis with aryl propiolates to yield 1-azabutadienes and their addition/6π-electrocyclization sequence with the other propiolate units. The resultant 1,4-dihydropyridines were aromatized to furnish the pyridines