We report here a C–H homoallylation reaction of aromaticketones with methylenecyclopropanes (MCPs) only using a catalytic amount of Fe(PMe3)4. A variety of aromaticketones and MCPs are applicable to the reaction to form ortho-homoallylated aromaticketones selectively via regioselective scission of the three-membered rings. The homoallylated products are amenable to further elaborations, providing
Iron-Catalyzed Regioselective Anti-Markovnikov Addition of C–H Bonds in Aromatic Ketones to Alkenes
作者:Naoki Kimura、Takuya Kochi、Fumitoshi Kakiuchi
DOI:10.1021/jacs.7b08385
日期:2017.10.25
alkylation reaction, in which the coupling of aromatic ketones with alkenes proceeds in the presence of only a simple Fe(PMe3)4 catalyst. The anti-Markovnikov addition of ortho C-H bonds in various ketones occurs with excellent regioselectivity under relatively mild reaction conditions. A strikingly wide variety of alkenes can be used for this reaction, and the high-yielding anti-Markovnikov addition
Pd-Catalyzed CH Oxygenation with TFA/TFAA: Expedient Access to Oxygen-Containing Heterocycles and Late-Stage Drug Modification
作者:Gang Shan、Xinglin Yang、Linlin Ma、Yu Rao
DOI:10.1002/anie.201207458
日期:2012.12.21
Acid brings the oxygen: A generalmethod for palladium‐catalyzed CH oxygenation has been developed for the facilesynthesis of a wide range of functionalized phenols with readily available aryl ketones, benzoates, benzamides, acetanilides, and sulfonamides. A trifluoroacetic acid/trifluoroacetic acid anhydride solvent system serves as the oxygen source and is the critical factor for CH activation
Manganese-Catalyzed Aromatic C–H Allylation of Ketones
作者:Shaukat Ali、Jiaqi Huo、Congyang Wang
DOI:10.1021/acs.orglett.9b02554
日期:2019.9.6
Manganese-catalyzed aromatic C-H allylation of ketones is reported. The reaction proceeded in a monoselective allylation manner to provide various ortho C-H allylated ketones in high yields. With challenging allylic electrophiles bearing substituents at the α-, β-, or γ-position, excellent SN2' regioselectivity was achieved under mild conditions (rt to 35 °C). Mechanistic studies revealed a possible
Allenes for Versatile Iron-Catalyzed C–H Activation by Weak O-Coordination: Mechanistic Insights by Kinetics, Intermediate Isolation, and Computation
作者:Antonis M. Messinis、Lars H. Finger、Lianrui Hu、Lutz Ackermann
DOI:10.1021/jacs.0c04837
日期:2020.7.29
ortho-regioselectivity in proximity to the weakly-coordinating carbonyl group for a range of substituted phenones and allenes. Detailed mechanistic studies, including the isolation of key intermediates, the structural characterization of an iron-metallacycle and kinetic analysis, allowed the sound elucidation of a plausible catalytic working mode. This mechanistic rationale is supported by detailed computational