α1-Adrenoceptor Agonists: The Identification of Novel α1A Subtype Selective 2′-Heteroaryl-2-(phenoxymethyl)imidazolines
摘要:
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.
Microwave-Assisted Suzuki Coupling Reactions with an Encapsulated Palladium Catalyst for Batch and Continuous-Flow Transformations
作者:Ian R. Baxendale、Charlotte M. Griffiths-Jones、Steven V. Ley、Geoffrey K. Tranmer
DOI:10.1002/chem.200501400
日期:2006.5.24
This article describes the design, optimisation and development of a Suzuki cross-coupling protocol mediated by an efficient palladium-encapsulated catalyst (Pd EnCat) under microwave irradiation. The methodology has been used in both batch mode for classical library preparation and in continuous-flow applications furnishing multigram quantities of material. Described is a method that uses direct focused
作者:Rebecca J. Burns、Ioulia K. Mati、Kamila B. Muchowska、Catherine Adam、Scott L. Cockroft
DOI:10.1002/anie.202006943
日期:2020.9.14
were transposed onto the Hammett substituent constant scale revealing dominant through‐space substituenteffects that cannot be described in classic terms. For example, NO2 groups positioned over a biaryl bond exhibited similar influences as resonant electron donors. Meanwhile, the electro‐enhancing influence of OMe/OH groups could be switched off or inverted by conformational twisting. 267 conformational
Synthesis of functionalized 4-phenyl-pyridines via electrochemically prepared organozinc reagents
作者:Erwan Le Gall、Corinne Gosmini、Jean-Yves Nédélec、Jacques Périchon
DOI:10.1016/s0040-4020(01)00015-1
日期:2001.3
The efficient and convenient synthesis of various functionalized 4-phenyl-pyridines 2 is described. The key step of the procedure is the electrochemical formation of aromatic organozincreagents 1 and their coupling with pyridinium salts. Intermediate 1,4-dihydropyridines are oxidized using mild conditions to provide functionalized 4-phenyl-pyridines in moderate to high overall yields.
The electrophilic behavior of the reactive entity in the phtosubstitution of benzenes with 2-iodopyridine was found to be ascribable to the intermediary 2-pyridyl cation, rather than to the electrophilic 2-pyridyl radical.
2-(2- and 3-Pyridyl)anilines (1, 2), 2,2-dimethyl-N-[2-(2- and 3-pyridyl)phenyl]propanamides (3, 4), and 2-, 3- and 4-(2-methoxyphenyl)pyridines (7-9) are readily synthesized using cross-coupling reactions. Whereas the amines 1, 2 undergo side reactions, the corresponding amides 3, 4 are deprotonated with lithium 2,2,6,6-tetramethylpiperidide (LTMP): the compound 3 at C6' under in situ quenching, and