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.