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.
Pd(II)-Catalyzed Carbonylation of C(sp<sup>3</sup>)−H Bonds: A New Entry to 1,4-Dicarbonyl Compounds
作者:Eun Jeong Yoo、Masayuki Wasa、Jin-Quan Yu
DOI:10.1021/ja108754f
日期:2010.12.15
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-Enabled Cross-Coupling of C(sp<sup>3</sup>)–H Bonds with Arylsilanes
作者:Jian He、Ryosuke Takise、Haiyan Fu、Jin-Quan Yu
DOI:10.1021/jacs.5b00890
日期:2015.4.15
Pd(II)-catalyzed cross-coupling of C(sp(3))-H bonds with organosilicon coupling partners has been achieved for the first time. The use of a newly developed quinoline-based ligand is essential for the cross-coupling reactions to proceed.