Regioselective Arene Functionalization: Simple Substitution of Carboxylate by Alkyl Groups
作者:Tobias Krüger、Katja Vorndran、Torsten Linker
DOI:10.1002/chem.200901774
日期:2009.11.9
from toluic and naphthoic acids, the carboxylate group was conveniently substituted by alkyl halides by Birch reduction and subsequent decarbonylation. The method is characterized by inexpensive starting materials and reagents, and methylation of arenes was realized. Besides simple alkyl substituents, the scope of arene functionalization was extended by benzyl, fluoro, amino, and ester groups. We were
Functionalized Allyl Aryl Ether Synthesis from Benzoic Acids Using a Dearomatization and Decarboxylative Allylation Approach
作者:Cheng-En Hsieh、Yu-Min Jiang、Chih-Ming Chou
DOI:10.1021/acs.joc.8b02487
日期:2019.1.18
toward the preparation of substituted allyl arylethers from benzoic acids via a dearomatization and decarboxylative allylation (DcA) reaction is presented. The benzoic acids undergo a dearomatization to give alkylated 2,5-cyclohexadienyl ketoesters which are subjected to a palladium-catalyzed DcA reaction, providing a variety of functionalized allyl arylethers. In addition, the combination of a resonance
Regioselective Threefold Aromatic Substitution of Benzoic Acid Derivatives by Dearomatization, Regioselective Functionalization, and Rearomatization
作者:Eva Koch、Armido Studer
DOI:10.1002/anie.201300259
日期:2013.4.26
Ipso, meta, and para: Benzoic acid derivatives can be highly regioselectively substituted at the ipso, meta, and para positions. The reaction sequence comprises an alkylative Birchreduction, a 4‐alkylation, a palladium‐catalyzed γ‐arylation, and an oxidative rearomatization (see scheme). All the reactions are robust and experimentally easy to conduct.
Walk on the same side! The title reaction occurs by means of highly stereospecific 1,3‐metal migration. The starting carboxylic acids are readily prepared by Birch reduction, and the developed protocol provides an efficient route to enantiomerically pure 5‐arylated‐1,3‐cyclohexadiene derivatives (see scheme).