Pyridine sulfinates as general nucleophilic coupling partners in palladium-catalyzed cross-coupling reactions with aryl halides
作者:Tim Markovic、Benjamin N. Rocke、David C. Blakemore、Vincent Mascitti、Michael C. Willis
DOI:10.1039/c7sc00675f
日期:——
Pyridine rings are ubiquitous in drug molecules; however, the pre-eminent reaction used to form carbon–carbon bonds in the pharmaceutical industry, the Suzuki–Miyaura cross-couplingreaction, often fails when applied to these structures. This phenomenon is most pronounced in 2-substituted pyridines, and results from the difficulty in preparing, the poor stability of, and low efficiency in reactions
One‐Pot Tandem Photoredox and Cross‐Coupling Catalysis with a Single Palladium Carbodicarbene Complex
作者:Yu‐Cheng Hsu、Vincent C.‐C. Wang、Ka‐Chun Au‐Yeung、Chung‐Yu Tsai、Chun‐Chi Chang、Bo‐Chao Lin、Yi‐Tsu Chan、Chao‐Ping Hsu、Glenn P. A. Yap、Titel Jurca、Tiow‐Gan Ong
DOI:10.1002/anie.201800951
日期:2018.4.16
transition‐metal‐catalyzed coupling (2 e− process) and photoredox catalysis (1 e− process) has emerged as a powerful approach to catalyze difficult cross‐coupling reactions under mild reaction conditions. Reported is a palladium carbodicarbene (CDC) complex that mediates both a Suzuki–Miyaura coupling and photoredox catalysis for C−N bond formation upon visible‐light irradiation. These two catalytic pathways
Transition-Metal-Free Desulfinative Cross-Coupling of Heteroaryl Sulfinates with Grignard Reagents
作者:Jun Wei、Huamin Liang、Chuanfa Ni、Rong Sheng、Jinbo Hu
DOI:10.1021/acs.orglett.8b03918
日期:2019.2.15
A mild cross-coupling reaction of heteroaryl sulfinates with Grignardreagents has been developed under transition-metal-free conditions. This study provides an example of the SO22– as a leaving group in an aromatic system and an effective methodology for the construction of C–C bond.
Palladium-Catalyzed Synthesis of Aromatic Ketones and Isoindolobenzimidazoles<i>via</i>Selective Aromatic CH Bond Acylation
作者:Juyou Lu、Hao Zhang、Xiaowu Chen、Hongxia Liu、Yuyang Jiang、Hua Fu
DOI:10.1002/adsc.201200743
日期:2013.1.9
A convenient and efficient palladium-catalyzed synthesis of aromatic ketones and isoindolobenzimidazoles has been developed via selective aromatic CH bond acylation. The protocol uses palladium acetate as the catalyst, readily available carboxylicacids as the acylating reagents, trifluoroacetic anhydride as the activated agent of the acids, and the corresponding aromatic ketones and isoindolobenzimidazoles
Palladium-catalyzed C–H arylation using aryltrifluoroborates in conjunction with a MnIII oxidant under mild conditions
作者:Cydney K. Seigerman、Tiffiny M. Micyus、Sharon R. Neufeldt、Melanie S. Sanford
DOI:10.1016/j.tet.2013.04.114
日期:2013.7
This paper describes the development of a mild Pd-catalyzed C-H arylation reaction using potassium aryltrifluoroborates in conjunction with Mn(OAc)3 as the oxidant. The scope of this transformation is explored with a variety of different aryltrifluoroborates and arylpyridine substrates. Preliminary mechanistic studies suggest that the reaction proceeds via a high-valent Pd mechanism with C-H activation occurring at or before the rate determining step. (C) 2013 Elsevier Ltd. All rights reserved.