Palladium-Catalyzed C-C Ring Closure in α-Chloromethylimines: Synthesis of 1<i>H</i>
-Indoles
作者:Delia Bellezza、Bárbara Noverges、Francesco Fasano、Jeymy T. Sarmiento、Mercedes Medio-Simón、Gregorio Asensio
DOI:10.1002/ejoc.201801607
日期:2019.2.14
2‐aryl‐ and 2‐alkyl‐1H‐indoles. Readily or commercially available α‐chloromethyl‐aryl or ‐alkyl ketones are used as the precursors. Indoles containing substituents, including halogens, at the benzene ring are also easily accessible simply by use of the appropriate substituted aromatic amine.
Through-Space 1,4-Palladium Migration and 1,2-Aryl Shift: Direct Access to Dibenzo[<i>a</i>,<i>c</i>]carbazoles through a Triple CH Functionalization Cascade
作者:Samir Kumar Bhunia、Arghya Polley、Ramalingam Natarajan、Ranjan Jana
DOI:10.1002/chem.201503474
日期:2015.11.16
A palladium‐catalyzed expeditious synthesis of dibenzofused carbazoles from readily available 2‐arylindoles and diaryliodonium salts is reported. Interestingly, after the electrophilic C3 palladation of indole, an unexpected “through‐space” 1,4‐palladium migration to the 2‐aryl moiety, by remote CH bond activation followed by CH arylation with diaryliodonium salt, and an unprecedented 1,2‐aryl shift
A palladium‐catalyzed tandem reaction for synthesis of 2‐arylindoles is described. The process involves a condensation/reduction/condensation/heteroannulation to give the respective indole. Furthermore, it also features satisfactory yields and selectivities.
Methods for the synthesis of an indole in provided. Methods comprise oxidizing a N-aryl imine in the presence of a palladium-based catalyst, an oxidant, and a solvent.
Pd-catalyzed intramolecular Heck dearomative alkenylation of aryliodides with functionalized N-tosylhydrazones proceeded through a sequential dearomative carbopalladation, migratory insertion, and β-hydride elimination in the presence of Pd(CF3COO)2 (10 mol %), PPh3 (30 mol %), and Cs2CO3 (2.0 equiv) in 1,4-dioxane (2.0 mL) at 120 °C for 14 h under an argon atmosphere. This cascade cycloaddition protocol