Rationale Behind the Resistance of Dialkylbiaryl Phosphines toward Oxidation by Molecular Oxygen
摘要:
Electron-rich dialkylbiaryl phosphines, which comprise a common class of supporting ligands for Pd-catalyzed cross-coupling reactions, are highly resistant toward oxidation by molecular oxygen. Presented herein are possible reasons why this class of phosphine ligands manifests this property. Experimental and theoretical data suggest that the two alkyl substituents on the phosphorus center and the 2' and 6' positions of the biaryl backbone play an important role in inhibiting oxidation of this class of ligands.
A Ligand Exchange Process for the Diversification of Palladium Oxidative Addition Complexes
作者:Ryan P. King、Shane W. Krska、Stephen L. Buchwald
DOI:10.1021/acs.orglett.1c02101
日期:2021.8.6
Palladium oxidative addition complexes (OACs) have recently emerged as useful tools to enable challenging bond connections. However, each OAC can only be formed with one dative ligand at a time. As no one ligand is optimal for every cross-coupling reaction, we herein disclose a ligand exchange protocol for the preparation of a series of OACs bearing a variety of ancillary ligands from one common complex
Catalysts for Suzuki−Miyaura Coupling Processes: Scope and Studies of the Effect of Ligand Structure
作者:Timothy E. Barder、Shawn D. Walker、Joseph R. Martinelli、Stephen L. Buchwald
DOI:10.1021/ja042491j
日期:2005.4.1
catalyst levels, to prepare extremely hindered biaryls and to be carried out, in general, for reactions of aryl chlorides at room temperature. Additionally, structural studies of various 1.Pd complexes are presented along with computational data that help elucidate the efficacy that 1 imparts on Suzuki-Miyaura coupling processes. Moreover, a comparison of the reactions with 1 and with 2-(2',4',6'-t
The magic I – versatile and so far elusive vicinally diiodinated PAHs have been prepared via a sequence of electrophilic borylation and boron/iodine exchange reactions.
通过一系列亲电硼酸化反应和硼/碘交换反应,已经制备出了神奇的I-通用且难以捉摸的二碘碘化PAH。
Rational Ligand Design for the Arylation of Hindered Primary Amines Guided by Reaction Progress Kinetic Analysis
作者:Paula Ruiz-Castillo、Donna G. Blackmond、Stephen L. Buchwald
DOI:10.1021/ja512903g
日期:2015.3.4
We report the Pd-catalyzed arylation of very hindered α,α,α-trisubstituted primary amines. Kinetics-based mechanistic analysis and rational design have led to the development of two biarylphosphine ligands that allow the transformation to proceed with excellent efficiency. The process was effective in coupling a wide range of functionalized aryl and heteroaryl halides under mild conditions.
METHOD FOR PREPARATION OF 6-[3(1-ADAMANTYL) -4-METHOXYPHENYL]-2-NAPHTOIC ACID
申请人:Kalvinsh Ivars
公开号:US20100076219A1
公开(公告)日:2010-03-25
A method for preparation of 6-[3-(1-adamantyl)-4-methoxyphenyl]-2-naphthoic acid is disclosed based on “one pot” synthesis approach including a direct synthesis of boronic acid derivative from 2-(1-adamantyl)-4-bromoanisole and cycloboranes with a subsequent Suzuki-Miyaura coupling with 6-halonaphthenoates and basic hydrolysis of the reaction product in ethylene glycol or 1,2-propanediol.