Three-step synthesis of 2,5,7-trisubstituted indoles from N-acetyl-2,4,6-trichloroaniline using Pd-catalyzed site-selective cross-coupling
作者:Miyuki Yamaguchi、Kei Manabe
DOI:10.1039/c7ob01547j
日期:——
We report a facile three-step synthesis of 2,5,7-trisubstituted indoles from N-acetyl-2,4,6-trichloroaniline, with the first step featuring Pd/dihydroxyterphenylphosphine (DHTP)-catalyzed ortho-selective Sonogashira coupling followed by cyclization to afford 2-substituted 5,7-dichloroindoles. Subsequent introduction of aryl or alkenyl groups at the C7 position was achieved by Pd/DHTP-catalyzed site-selective
DBSA‐Catalyzed Regioselective Dehydrative Friedel‐Crafts Arylation of CF
<sub>3</sub>
‐Containing 3‐Indolyl(2‐thiophenyl)methanols with 2‐Substituted Indoles in Water
A green and efficient regioselectivedehydrativeFriedel‐Craftsarylation of trifluorinated 3‐indolyl(2‐thiophenyl) methanols with 2‐substitutedindoles, catalyzed by DBSA (dodecylbenzenesulfonic acid) in water is described. This simple and atom‐economical protocol features a unique regioselective 1,8‐addition, operational simplicity, mild conditions, excellent functional group compatibility, and environmental
Direct C3-Selective Arylation of N-Unsubstituted Indoles with Aryl Chlorides, Triflates, and Nonaflates Using a Palladium–Dihydroxyterphenylphosphine Catalyst
successfully applied to the direct C3-arylation of N-unsubstituted indoles with arylchlorides, triflates, and nonaflates. This catalyst showed C3-selectivity, whereas catalysts with other structurally related ligands exhibited N1-selectivity. Complex formation between the lithium salts of the ligand and the indole is assumed to accelerate the arylation at the C3 position. Reactions using 3-alkylindoles afforded
Au-catalyzed synthesis of 2-alkylindoles from N-arylhydroxylamines and terminal alkynes
作者:Yanzhao Wang、Longwu Ye、Liming Zhang
DOI:10.1039/c1cc12212f
日期:——
The first gold-catalyzed addition of N-arylhydroxylamines to aliphatic terminal alkynes is developed to access O-alkenyl-N-arylhydroxylamines, which undergo facile in situ sequential 3,3-rearrangements and cyclodehydrations to afford 2-alkylindoles with regiospecificity and under exceptionally mild reaction conditions.
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.