NMR Kinetic Studies on the Decomposition of β-Amidozinc Reagents: Optimization of Palladium-Catalyzed Cross-Coupling with Acid Chlorides
作者:Charles S. Dexter、Christopher Hunter、Richard F. W. Jackson、Jason Elliott
DOI:10.1021/jo000558p
日期:2000.11.1
beta-amidozinc reagent 4 by beta-elimination has been shown to be a unimolecular process in both THF and DMF as solvent, with relative rates of 4:1 at room temperature, and activation parameters have been determined. These results indicate the beta-elimination is a syn-process. NMR experiments reveal that as little as 2 equiv of DMF can have a significant stabilizing influence on reagent 4. Use of a mixture