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
2-Substituted 1,3-benzoxathiolium tetrafluoroborates were used for the two-step acylation of electron-rich aromatic and heteroaromatic compounds: 1,3-dimethoxybenzene, 1,3,5-trimethoxybenzene, pyrrole and indoles. In most of the cases intermediate 2,2-disubstituted 1,3-benzoxathioles were obtained in good to high yields (55-100%) and subsequent hydrolysis of these with mercury(II) oxide and aqueous tetrafluoroboric acid (35%) in tetrahydrofuran afforded the corresponding ketones in almost quantitative yields.
Tandem Iridium-Catalyzed Decarbonylative C–H Activation of Indole: Sacrificial Electron-Rich Ketone-Assisted Bis-arylsulfenylation
作者:Subban Kathiravan、Prasad Anaspure、Tianshu Zhang、Ian A. Nicholls
DOI:10.1021/acs.orglett.1c00829
日期:2021.5.7
the C2 and C4 C–H bonds through the use of pentamethylcyclopentadienyl iridium dichloride dimer ([Cp*IrCl2]2) catalyst and disulfides. A new sacrificial electron-rich adamantoyl-directing group facilitates indole C–H bis-functionalization with a traceless in situ removal. Various differently substituted disulfides can be easily accommodated in this reaction by a coordination to Ir(III) through the formation
Breaking the Trend: Insight into Unforeseen Reactivity of Alkynes in Cobalt-Catalyzed Weak Chelation-Assisted Regioselective C(4)–H Functionalization of 3-Pivaloyl Indole
作者:Shyam Kumar Banjare、Tanmayee Nanda、Bedadyuti Vedvyas Pati、Gopal Krushna Das Adhikari、Juhi Dutta、Ponneri C. Ravikumar
DOI:10.1021/acscatal.1c02689
日期:2021.9.17
chelation-assisted cobalt-catalyzed regioselectiveC(4)–H activation of 3-pivolyl indole. α-Hydroxy ketone and α,β-unsaturated ketone derivatives have been synthesized in good yields from indole and alkynes. Notably, the indole C(4)–H-functionalized α,β-unsaturated ketone product was obtained with high stereo- and regioselectivity simply by changing the coupling partner from symmetrical alkynes to