Directing Group‐Promoted Inert C−O Bond Activation Using Versatile Boronic Acid as a Coupling Agent
作者:Ram Ambre、Ting‐Hsuan Wang、Anmei Xian、Yu‐Shiuan Chen、Yu‐Fu Liang、Titel Jurca、Lili Zhao、Tiow‐Gan Ong
DOI:10.1002/chem.202004132
日期:2020.12.18
strategy facilitates the efficient catalytic cross‐coupling of methoxyarenes with a variety of organoboronreagents. Directing groups facilitate the activation of inert C−O bonds in under‐utilized aryl methyl ethers enabling their adaptation for C−C cross‐coupling reactions as less toxic surrogates to the ubiquitous haloarenes. The method reported enables C−C cross‐coupling with readily available and economical
[EN] PYRROLIDINYL AND PIPERIDINYL COMPOUNDS USEFUL AS NHE-1 INHIBITORS<br/>[FR] COMPOSÉS PYRROLIDINYLIQUE ET PIPÉRIDINYLIQUE UTILES COMME INHIBITEURS DE NHE-1
申请人:BOEHRINGER INGELHEIM INT
公开号:WO2010005783A1
公开(公告)日:2010-01-14
Disclosed are compounds of formula (I) and compositions of the present invention which are inhibitors of the sodium proton exchanger isoform-1 (NHE-I). Also disclosed are methods of using and making the same.
Copper-catalyzed fluorination of 2-pyridyl aryl bromides
作者:Xin Mu、Hao Zhang、Pinhong Chen、Guosheng Liu
DOI:10.1039/c3sc51876k
日期:——
Copper(I)-catalyzed cross-coupling of aryl halides is the subject of extensive interest in synthetic chemistry, but the related catalytic fluorination is unsuccessful. Herein, we have developed a novel copper-catalyzed fluorination of aryl bromides using AgF as the fluorine source. In this transformation a pyridyl directing group is essential for successful catalytic fluorination. A XANES/EXAFS study indicated that the presence of the pyridyl group is essential to stabilize the Cu(I) species and accelerate oxidative addition of the aryl bromide. Further mechanistic studies implicated a Cu(I/III) catalytic cycle in this Cu(I)-catalyzed fluorination, and final aryl C–F bond formation possibly proceeds through an irreversible reductive elimination of the ArCu(III)–F species. This rare report of catalytic fluorination by a copper catalyst provides a valuable foundation for further development of Cu(I)-catalyzed fluorination of aryl halides.
α1-Adrenoceptor Agonists: The Identification of Novel α1A Subtype Selective 2′-Heteroaryl-2-(phenoxymethyl)imidazolines
作者:Michael J Bishop、Kevin A Barvian、Judd Berman、Eric C Bigham、Deanna T Garrison、Michael J Gobel、Stephen J Hodson、Paul E Irving、James A Liacos、Frank Navas, III、David L Saussy、Jason D Speake
DOI:10.1016/s0960-894x(01)00764-8
日期:2002.2
Novel 2'-heteroaryl-2-(phenoxymethyl)imidazolines have been identified as potent agonists of the cloned human alpha(1)-adrenoceptors in vitro. The nature of the 2'-heteroaryl group can have significant effects on the potency, efficacy, and subtype selectivity in this series. alpha(1A) Subtype selective agonists have been identified. (C) 2002 Elsevier Science Ltd. All rights reserved.