Palladium Catalyzed Regioselective C4‐Arylation and Olefination of Indoles and Azaindoles
作者:Neetipalli Thrimurtulu、Arnab Dey、Anurag Singh、Kuntal Pal、Debabrata Maiti、Chandra M. R. Volla
DOI:10.1002/adsc.201801378
日期:2019.3.15
A convergent strategy for the synthesis of biologically relevant C4‐substituted indole scaffolds was demonstrated using Pd(II)‐catalyzed remote C−H functionalization of indoles and azaindoles. The reaction displays high regioselectivity for the C4‐position of indole‐3‐carbaldehydes using glycine as an inexpensive transient directing group. Notable features of this transformation include the selective
Directed C–H Functionalization of C3-Aldehyde, Ketone, and Acid/Ester-Substituted Free (NH) Indoles with Iodoarenes <i>via</i> a Palladium Catalyst System
Pd(II)-catalyzed C–H arylations of free (NH) indoles including different carbonyldirecting groups on C3-position with aryl iodides are demonstrated. Importantly, the reactions are carried out using the same catalyst system without any additional transient directing group (TDG). In this study, the formyl group as a directing group gave the C4-arylated indoles versus C2-arylation. Using this catalyst