Benzylic Aroylation of Toluenes Mediated by a LiN(SiMe<sub>3</sub>)<sub>2</sub>/Cs<sup>+</sup> System
作者:Yuanyun Gu、Zhen Zhang、Yan-En Wang、Ziteng Dai、Yaqi Yuan、Dan Xiong、Jie Li、Patrick J. Walsh、Jianyou Mao
DOI:10.1021/acs.joc.1c02446
日期:2022.1.7
Chemoselective deprotonative functionalization of benzylic C–H bonds is challenging, because the arene ring contains multiple aromatic C(sp2)–H bonds, which can be competitively deprotonated and lead to selectivity issues. Recently it was found that bimetallic [MN(SiMe3)2 M = Li, Na]/Cs+ combinations exhibit excellent benzylic selectivity. Herein, is reported the first deprotonative addition of toluenes
anti-inflammatory drug oxaprozin. Systematic structure–activity relationship analysis enabled structuraloptimization toward low nanomolar potency similar to the well-established rexinoids. Cocrystal structures of the most active derivatives demonstrated orthosteric binding, and in vivo profiling revealed superior PK properties compared to current RXR agonists. The optimized compounds were highly selective for RXR
Catalytic Decarboxylative Cross-Ketonisation of Aryl- and Alkylcarboxylic Acids using Magnetite Nanoparticles
作者:Lukas J. Gooßen、Patrizia Mamone、Christoph Oppel
DOI:10.1002/adsc.201000429
日期:2011.1.10
In the presence of catalytic amounts of magnetite nanopowder, mixtures of aromatic and aliphatic carboxylic acids are converted selectively into the corresponding aryl alkyl ketones. As by‐products, only carbon dioxide and water are released. This catalytic cross‐ketonisation allows the regioselective acylation of aromatic systems and, thus, represents a sustainable alternative to Friedel–Crafts acylations