Ni-Catalyzed Cross Coupling of Alkoxide-Containing Vinyl Halides with Grignard Reagents. A “One-Pot” Synthesis of 2-[(Trimethylsilyl)methyl]-2-propen-1-yl Acetate
A Mild, Convenient, and Inexpensive Procedure for Conversion of Vinyl Halides to α-Haloketones
作者:Michael P. VanBrunt、Reuben O. Ambenge、Steven M. Weinreb
DOI:10.1021/jo020739m
日期:2003.4.1
to the corresponding alpha-chloroketone. Similarly, if a vinyl bromide is exposed to sodium hypobromite (freshly prepared from bromine and sodium hydroxide) at 0 degrees C in 2:5 acetic acid/acetone as solvent, an alpha-bromoketone is produced. This methodology has been applied to a number of vinyl chlorides and vinyl bromides, and the transformations generally proceed in high yields. The mild reaction
On the Regiochemistry of Nucleophilic Attack on 2-Halo π-Allyl Complexes. 4. The Effect of Silver Acetate and Nucleophile Concentrations in Competitive Nucleophilic Attack with Malonate and Phenoxide Nucleophiles
作者:Michael G. Organ、Elena A. Arvanitis、Stephen J. Hynes
DOI:10.1021/jo034119c
日期:2003.5.1
under Pd catalysis to generate the 2-bromo Pd-pi-allyl complex (triphenylphosphine ligand), which alkylates with malonate nucleophile at the terminal position. The presence of acetateion in the reaction mixture results in some malonate attack being redirected to the central carbon. The acetateion can come from the ionization of 1-acetoxy-2-bromo-2-propene or by the addition of silver acetate to the