Aerobic, Metal-Free, and Catalytic Dehydrogenative Coupling of Heterocycles: En Route to Hedgehog Signaling Pathway Inhibitors
摘要:
The nitrosonium ion-catalyzed dehydrogenative coupling of heteroarenes under mild reaction conditions is reported. The developed method utilizes ambient molecular oxygen as a terminal oxidant, and only water is produced as byproduct. Dehydrogenative coupling of heteroarenes translated into the rapid discovery of novel hedgehog signaling pathway inhibitors, emphasizing the importance of the developed methodology.
Regiocontroled Palladium-Catalysed Direct Arylation at Carbon C2 of Benzofurans using Benzenesulfonyl Chlorides as the Coupling Partners
作者:Lenka Loukotova、Kedong Yuan、Henri Doucet
DOI:10.1002/cctc.201301077
日期:2014.3.10
products together with C2,C3 diarylation products. We found that the use of benzenesulfonylchlorides instead of aryl halides as the coupling partner allows for controlling the regioselectivity of the palladium‐catalysed arylation of benzofurans in favour of carbon C2. This method tolerates a variety of substituents on the benzenesulfonyl derivative.
Mild and selective base-free C–H arylation of heteroarenes: experiment and computation
作者:Hannes P. L. Gemoets、Indrek Kalvet、Alexander V. Nyuchev、Nico Erdmann、Volker Hessel、Franziska Schoenebeck、Timothy Noël
DOI:10.1039/c6sc02595a
日期:——
A mild and selective C–Harylation strategy for indoles, benzofurans and benzothiophenes is described. The arylation method engages aryldiazonium salts as arylating reagents in equimolar amounts. The protocol is operationally simple, base free, moisture tolerant and air tolerant. It utilizes low palladium loadings (0.5 to 2.0 mol% Pd), short reaction times, green solvents (EtOAc/2-MeTHF or MeOH) and
Palladium Nanoparticles Catalyzed Synthesis of Benzofurans by a Domino Approach
作者:Pavan Mandali、Dillip Chand
DOI:10.1055/s-0034-1380463
日期:2015.6
Palladium nanoparticles (PdNPs) were used as a catalyst for the one-pot synthesis of a variety of benzofurans by Sonogashira cross-coupling reactions under ambient conditions. The catalyst could be recycled without significant loss in its activity.
Domino synthesis of 2-arylbenzo[b]furans by copper(II)-catalyzed coupling of o-iodophenols and aryl acetylenes
作者:E.A. Jaseer、D.J.C. Prasad、Govindasamy Sekar
DOI:10.1016/j.tet.2010.01.026
日期:2010.3
range of 2-arylbenzo[b]furans are synthesized through domino intermolecular C(aryl)–C(alkynyl) bond formation followed by intramolecular C(alkynyl)–O bond forming cyclization via copper(II)-catalyzed coupling of o-iodophenols and aryl terminal acetylenes. This method requires neither expensive palladium catalyst nor oxophilic phosphine ligands, can tolerate different functional groups. The methodology
Unexpected one-step synthesis of 3-benzoyl-2-phenylbenzofurans under Wittig conditions
作者:Michela Begala、Pierluigi Caboni、Maria João Matos、Giovanna Lucia Delogu
DOI:10.1016/j.tetlet.2018.03.048
日期:2018.5
conditions, led to 2-phenylbenzofuran derivatives 4a–p and the unexpectedformation of 3-benzoyl-2-phenylbenzofuran derivatives 5a–p. Benzoyl chlorides possessing electron-withdrawing groups afforded 3-benzoyl-2-phenylbenzofuran derivatives in higher yields than those with electron-donating groups. This reaction represents a simple and regioselective, one-pot route towards the preparation of deactivated