Copper-Catalyzed Oxidative Heck Reactions between Alkyltrifluoroborates and Vinyl Arenes
作者:Timothy W. Liwosz、Sherry R. Chemler
DOI:10.1021/ol401220b
日期:2013.6.21
potassium alkyltrifluoroborates can be utilized in oxidative Heck-type reactions with vinyl arenes. The reaction is catalyzed by a Cu(OTf)2/1,10-phenanthroline with MnO2 as the stoichiometric oxidant. In addition to the alkyl Heck, amination, esterification, and dimerization reactions of alkyltrifluoroborates are demonstrated under analogous reaction conditions. Evidence for an alkyl radical intermediate
Aroyl Fluorides as Bifunctional Reagents for Dearomatizing Fluoroaroylation of Benzofurans
作者:Xiaoye Yu、Qing-Yuan Meng、Constantin G. Daniliuc、Armido Studer
DOI:10.1021/jacs.2c01735
日期:2022.4.27
diastereoselectivity. Cascades proceed via radical/radical cross-coupling of a benzofuran radical cation generated in the photoredoxcatalysis cycle with a neutral ketyl radical formed through the NHC catalysis cycle. The redox-neutral transformation exhibits broad substrate scope and high functional group compatibility. With anhydrides as bifunctional reagents, dearomatizing aroyloxyacylation of benzofurans is
Structure−Activity Relationship Studies on Benzofuran Analogs of Propafenone-Type Modulators of Tumor Cell Multidrug Resistance
作者:Gerhard Ecker、Peter Chiba、Manuela Hitzler、Diethard Schmid、Klaus Visser、Hans Peter Cordes、Josef Csöllei、Joachim K. Seydel、Klaus-Jürgen Schaper
DOI:10.1021/jm960384x
日期:1996.1.1
A series of benzofurylethanolamine analogs of propafenone (1a) have been prepared and evaluated for multidrugresistance-reversingactivity in two in vitro assay systems. As for propafenones, an excellent correlation of biological data with calculated lipophilicity values was found for benzofurans, whereby the latter generally had lower activity/lipophilicity ratios. Almost identical slopes of the
Synthese und Pharmakodynamische Aktivität von 2-(3-(2-Phenylethyl)benzofuran-2-yl)-N-propyl-ethanamin
作者:G. Ecker、T. Helml、W. Fleischhacker、C. R. Noe、Christian Studenik、Bettina Schade、Peter Heistracher
DOI:10.1002/ardp.19953280410
日期:——
Im Rahmen von Struktur‐Wirkungs‐Untersuchungen an Klasse I‐Antiarrhythmika wurden die Benzofuranethanamine 3a und 3b synthetisiert, und 3a wurde pharmakologisch geprüft. Schlüsselschritt der Synthese war die chemoselektive Reduktion des Chloracetyl‐Dihydrobenzofurans 5 zum Chlorethylbenzofuran 9 mit Triethylsilan/BF3 · Et2O. Die Ergebnisse einer Reihe weiterer Reduktionsversuche von 5 werden ebenfalls
Asymmetric synthesis of (S)-bufuralol of 87% ee from 3-ethyl-2-hydroxybenzaldehyde, via the reduction of 2-bromo-1-(7-ethylbenzofuran-2-yl)ethanone with (-)-B-chlorodiisopinocampheylborane as the key step, followed by cyclization of the product bromohydrin to the corresponding epoxide and treatment with tert-butylamine, is described. (S)-1-(3-Phenethylbenzofuran-2-yl)-2-propylaminoethanol of 73% ee, a propafenone analogue, was prepared following the same approach. (C) 2003 Elsevier Science Ltd. All rights reserved.