Direct C–H alkylation and indole formation of anilines with diazo compounds under rhodium catalysis
作者:Neeraj Kumar Mishra、Miji Choi、Hyeim Jo、Yongguk Oh、Satyasheel Sharma、Sang Hoon Han、Taejoo Jeong、Sangil Han、Seok-Yong Lee、In Su Kim
DOI:10.1039/c5cc07767b
日期:——
The rhodium(III)-catalyzed direct functionalization of aniline C-H bonds with [small alpha]-diazo compounds is described. These transformations provide the facile construction of ortho-alkylated anilines with diazo malonates or highly substituted indoles with...
Dialkylterphenyl Phosphine‐Based Palladium Precatalysts for Efficient Aryl Amination of
<i>N</i>
‐Nucleophiles
作者:Raquel J. Rama、Celia Maya、M. Carmen Nicasio
DOI:10.1002/chem.201903279
日期:2020.1.22
in arylamination reactions. Cationic complexes bearing the phosphines PiPr2 ArXyl2 and PCyp2 ArXyl2 were the most active of the series. These precatalysts have demonstrated a high versatility and efficiency in the coupling of a variety of nitrogen nucleophiles, including secondary amines, alkyl amines, anilines, and indoles, with electronically deactivated and ortho-substituted arylchlorides at low
On the Importance of an Acid Additive in the Synthesis of Pyrido[1,2‐
<i>a</i>
]benzimidazoles by Direct Copper‐Catalyzed Amination
作者:Kye‐Simeon Masters、Tom R. M. Rauws、Ashok K. Yadav、Wouter A. Herrebout、Benjamin Van der Veken、Bert U. W. Maes
DOI:10.1002/chem.201100574
日期:2011.5.27
8‐substituted pyrido[1,2‐a]benzimidazoles (4) has been developed by a direct intramolecular CH amination of N‐phenylpyridin‐2‐amines (3). Efficient CH amination of 3 could only be achieved in the presence of catalytic copper and an acid additive. The type of acid (pKa) proved to be crucial for the catalysis. CCl aminations in N‐(2‐chloroaryl)pyridin‐2‐amines allow access to 9‐substituted pyrido[1,2‐a]benzimidazoles
Ruthenium-Catalyzed Remote C–H Sulfonylation of <i>N</i>-Aryl-2-aminopyridines with Aromatic Sulfonyl Chlorides
作者:Balu Ramesh、Masilamani Jeganmohan
DOI:10.1021/acs.orglett.7b03051
日期:2017.11.3
A ruthenium-catalyzedremote sulfonylation at the C5 position of the pyridine group of N-aryl-2-aminopyridines with aromatic sulfonyl chlorides is described. The mechanistic and deuterium labeling studies clearly reveal that the ruthenametallacycle is a key intermediate in the reaction, which forms via the C–H bond activation. The DFT calculation supports that the C5 position of the 2-aminopyridine
A copper modified phosphorus doped g-C3N4 (Cu/P-CN) has been prepared and identified as an efficient catalyst for the synthesis of N-arylpyridin-2-amine derivatives by the reaction of 2-aminopyridine and aryl boronic acid under the irradiation of blue light.