A nickel-catalyzed cross-coupling of alkenyl methyl ethers with Grignard reagents, undermildconditions, is described. These conditions allowed access to various stilbenes and heterocyclic stilbenic derivatives as well as to a potential anticancer agent DMU-212.
Enol ethers as carbonyl surrogates in a modification of the Povarov synthesis of 3-aryl quinolines and their anti-Toxoplasma activity
作者:Carla E. Brown、James McNulty、Claudia Bordón、Robert Yolken、Lorraine Jones-Brando
DOI:10.1039/c6ob01083k
日期:——
A novel method for the preparation of 2-carboxyl-3-aryl quinoline derivatives from anilines, ethyl glyoxalate and enol ethers as phenylacetaldehyde surrogates is reported. The three-component coupling reaction occurs rapidly under mild conditions in dichloromethane catalysed by TFA. The method allows a more direct access to 3-aryl quinolines, sidestepping issues encountered with phenylacetaldehyde
Intermolecular Hydroalkoxylation of Terminal Alkynes Catalyzed by a Dipyrrinato Rhodium(I) Complex with Unusual Selectivity
作者:Raphael H. Lam、D. Barney Walker、Matthew H. Tucker、Mark R. D. Gatus、Mohan Bhadbhade、Barbara A. Messerle
DOI:10.1021/acs.organomet.5b00561
日期:2015.9.14
An operationally simple and atom-economical method for the E-selective preparation of enol ethers is described. A novel dicarbonyl(S-phenyldipyrrinato)rhodium complex, 2, was prepared in four synthetic steps, characterized by X-ray crystallography and NMR spectroscopy, and then investigated as a catalyst for the intermolecular hydro-alkoxylation of terminal alkynes. Solvent and substrate studies were used to gain insight into the mechanism of the reaction. Cyclic voltammetry was also used to investigate the electronic properties of 2. The rhodium(I)-catalyzed intermolecular alkyne hydroalkoxylation reaction reported here mediates excellent substrate transformation with a high degree of E/Z selectivity which is opposite to that reported previously using alternative catalysts.