Pd-Catalyzed Arylation/Oxidation of Benzylic C–H Bond
摘要:
A palladium-catalyzed benzylic C-H arylation/oxidation reaction leading to diaryl ketones has been accomplished. The indispensable role of the bidentate system is disclosed for this sequential process. This chemistry offers a direct new access to a range of diarylketones.
A highly efficient, selective synthesis of benzyl esters by palladium catalysis is developed through the bidentate directing group assisted functionalization of multiple C(sp3)–H bonds.
A general palladium catalyzed acetoxylation of benzylicC–H bonds has been developed. Picolinamides serve as an excellent directinggroup for the C–H activation of benzylic methyls. A wide range of 2-amino benzyl alcohol analogues were synthesized in good yields. The products demonstrated broad synthetic utilities toward various benzo-fused heterocycles. Mechanistic studies revealed the key rate-limiting
Pd(OAc)(2)-catalyzed oxidative acetoxylation of benzylic C-H bonds utilizing a bidentate system has been explored. A variety of picolinoyl- or quinoline-2-carbonyl-protected toluidine derivatives react with PhI(OAc)(2) in the presence of Pd(OAc)(2) to afford the acetoxylated products in synthetically useful yields. A broad of functionalities, such as CH3, F, Cl, Br, I, COCH3, CO2Et, SO2CH3, and NO2, were tolerated. This transformation provides easy access to 2-hydroxymethylaniline derivatives.
Pd-Catalyzed Arylation/Oxidation of Benzylic C–H Bond
A palladium-catalyzed benzylic C-H arylation/oxidation reaction leading to diaryl ketones has been accomplished. The indispensable role of the bidentate system is disclosed for this sequential process. This chemistry offers a direct new access to a range of diarylketones.
Palladium-Catalyzed Regioselective Insertion of Carbenes into γ-C(sp<sup>3</sup>)–H Bonds of Aliphatic Amines
作者:Peng Zhang、Cheng-xin Li、ShihaoZhi Wang、Xue-jing Zhang、Ming Yan
DOI:10.1021/acs.orglett.4c00038
日期:2024.4.5
migratory insertion of carbenes into distal γ-C(sp3)–H bonds of aliphatic amines has been successfully developed. The synergistic interplay among a palladium catalyst, picolinamide directing group, a carefully selected base additive, and an essential ligand proved crucial in achieving high yields. These findings hold significant value for advancing the exploration of regioselective carbeneinsertions into