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.