Direct synthesis of arenecarboxamides through Friedel–Crafts acylation using ureas
摘要:
The reaction of urea derivatives that contain the phenothiazine unit with trifluoromethanesulfonic anhydride in the presence of electron-rich aromatic compounds leads to the formation of arenecarboxamides. The reaction has been successfully demonstrated for several inter- and intramolecular systems. (C) 2014 Elsevier Ltd. All rights reserved.
Synthesis of substituted aryl amidines from aminoacetonitriles
作者:Zhiwei Yin、Zhongxing Zhang、Juliang Zhu、Henry Wong、John F. Kadow、Nicholas A. Meanwell、Tao Wang
DOI:10.1016/j.tetlet.2005.04.142
日期:2005.7
oxidized by NiO2–H2O or MnO2 in the presence of a wide range of NH2-containing compounds to afford aryl amidines, presumably via iminium intermediates. A ‘one-pot’ procedure for the preparation of heteroaryl amidinesfrom N-containing heteroaryl halides through a process comprising sequential SNAr substitution and oxidation has also been developed.
meta-Selective C–H Borylation of Benzamides and Pyridines by an Iridium–Lewis Acid Bifunctional Catalyst
作者:Lichen Yang、Nao Uemura、Yoshiaki Nakao
DOI:10.1021/jacs.9b03138
日期:2019.5.15
We report herein the iridium-catalyzed meta-selective C-H borylation of benzamides by using a newly designed 2,2'-bipyridine (bpy) ligand bearing an alkylaluminum biphenoxide moiety. We also demonstrate the iridium-catalyzed C3-selective C-H borylation of pyridine with a 1,10-phenanthroline (Phen) ligand bearing an alkylborane moiety. It is proposed that the Lewisacid-base interaction between the
A palladium-catalyzed N-acylation of tertiary amines by carboxylic acids was achieved through C–N cleavage. This reaction showed a wide substrate scope. Both aromatic and aliphatic acids served well as the acylating reagents and coupled with tertiary amines to produce the corresponding amides in good to excellent yields. With the strategy, bioactive carboxylic acids were also efficiently modified,
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‐Selective C−H Borylation of (Hetero)Arenes by Cooperative Iridium/Aluminum Catalysis
作者:Lichen Yang、Kazuhiko Semba、Yoshiaki Nakao
DOI:10.1002/anie.201701238
日期:2017.4.18
para‐SelectiveC−H borylation of benzamides and pyridines has been achieved by cooperative iridium/aluminum catalysis. A combination of iridium catalysts commonly employed for arene C−H borylation and bulky aluminum‐based Lewis acid catalysts provides an unprecedented strategy for controlling the regioselectivity of C−H borylation to give variously substituted (hetero)arylboronates, which are versatile