Pd(II)-Catalyzed Carbonylation of C(sp3)−H Bonds: A New Entry to 1,4-Dicarbonyl Compounds
摘要:
Pd(II)-catalyzed beta-C(sp(3))-H carbonylation of N-arylamides under CO (1 atm) has been achieved. Following amide-directed C(sp(3))-H cleavage and insertion of CO into the resulting [Pd(II)-C(sp(3))] bond, intramolecular C-N reductive elimination gave the corresponding succinimides, which could be readily converted to 1,4-dicarbonyl compounds. This method was found to be effective with substrates containing alpha-hydrogen atoms and could be applied to effect methylene C(sp(3))-H carbonylation of cyclopropanes.
Ligand-Promoted Borylation of C(sp<sup>3</sup>
)H Bonds with Palladium(II) Catalysts
作者:Jian He、Heng Jiang、Ryosuke Takise、Ru-Yi Zhu、Gang Chen、Hui-Xiong Dai、T. G. Murali Dhar、Jun Shi、Hao Zhang、Peter T. W. Cheng、Jin-Quan Yu
DOI:10.1002/anie.201509996
日期:2016.1.11
palladium‐catalyzed borylation of C(sp3)H bonds. Primary β‐C(sp3)H bonds in carboxylic acid derivatives as well as secondary C(sp3)H bonds in a variety of carbocyclic rings, including cyclopropanes, cyclobutanes, cyclopentanes, cyclohexanes, and cycloheptanes, can thus be borylated. This directed borylation method complements existing iridium(I)‐ and rhodium(I)‐catalyzed CHborylation reactions in terms
The palladium(II)‐catalyzedβ‐ and γ‐alkynylation of amide C(sp3)−H bonds is enabled by pyridine‐based ligands. This alkynylation reaction is compatible with substrates containing α‐tertiary or α‐quaternary carbon centers. The β‐methylene C(sp3)−H bonds of various carbocyclic rings were also successfully alkynylated.
Ligand-Enabled Methylene C(sp<sup>3</sup>)–H Bond Activation with a Pd(II) Catalyst
作者:Masayuki Wasa、Kelvin S. L. Chan、Xing-Guo Zhang、Jian He、Masanori Miura、Jin-Quan Yu
DOI:10.1021/ja309325e
日期:2012.11.14
Pd(II) insertion into beta-methylene C(sp(3))-H bonds was enabled by a mutually repulsive and electron-rich quinoline ligand. Ligand tuning led to the development or a method that allows for installation of an aryl,, group On a range of acyclic and cyclic amides containing beta-methylene C(sp(3))-H bonds.