A palladium-catalyzed carbothiolation via the reaction of a σ-alkyl palladium intermediate with a TIPS thioether is described. It was found that the use of Cs2CO3, (IPr)Pd(allyl)Cl, and a TIPS thioether was key to obtaining alkyl aryl and dialkyl sulfides in high yield through the reaction of a σ-alkyl palladium intermediate. The developed reaction is applicable to a wide range of substrates and thiols
描述了通过σ-烷基钯中间体与TIPS硫醚反应的钯催化的羰基硫醇化。发现使用Cs 2 CO 3,(IPr)Pd(烯丙基)Cl和TIPS硫醚是通过σ-烷基钯中间体反应以高收率获得烷基芳基和二烷基硫化物的关键。所开发的反应适用于多种底物和硫醇。
One-Pot Synthesis of Unsymmetrical Diaryl Thioethers by Palladium-Catalyzed Coupling of Two Aryl Bromides and a Thiol Surrogate
作者:Manuel A. Fernández-Rodríguez、John F. Hartwig
DOI:10.1002/chem.200902313
日期:2010.2.22
convenient, and efficient: A general and operationally simple one‐potsynthesis of unsymmetrical diaryl sulfides by coupling two different bromoarenes and triisopropylsilanethiol (TIPS‐SH) is reported. This protocol overcomes the narrow availability of arene thiols and their instability to oxidation. These reactions catalyzed by palladium complexes generated from the alkylbisphosphine CyPF‐tBu occur
非常简单、方便和高效:报道了一种通过将两种不同的溴芳烃和三异丙基硅烷硫醇 (TIPS-SH) 偶联来通用且操作简单的一锅法合成不对称二芳基硫化物。该协议克服了芳烃硫醇的狭窄可用性及其对氧化的不稳定性。这些由烷基双膦 CyPF- t Bu生成的钯配合物催化的反应以良好的收率发生,具有广泛的范围和高官能团耐受性。
Palladium-Catalyzed Thiocarbonylations with Triisopropylsilyl Thioethers
We have developed a palladium-catalyzed thiocarbonylation through the reaction of a σ-alkyl palladium intermediate with carbonmonoxide and a triisopropylsilyl (TIPS) thioether. The use of CsF, (IPr)Pd(allyl)Cl [IPr =1,3-bis(2,6-diisopropylphenyl)imidazol-2-ylidene], CO, and a TIPS thioether in THF are key to obtaining alkyl and aryl thioesters in high yields. The yield of the palladium-catalyzed thiocarbonylation
A palladium-catalyzed cascade reaction for preparing 2,3-dihydrobenzo[b]thiophenes and the corresponding 1,1-dioxides bearing the C3 benzylic quaternary carbon is described. This cascade reaction involves the oxidative addition of aryl iodide to Pd(0) to form a σ-aryl palladium intermediate, insertion of the internal alkene into the σ-aryl palladium intermediate to form a σ-alkyl palladium intermediate
Synthesis of novel cyclopropylic sulfones and sulfonamides acting as glucokinase activators
作者:Stefan Heuser、David G. Barrett、Martina Berg、Benjamin Bonnier、Astrid Kahl、Maria Luz De La Puente、Niall Oram、Rainer Riedl、Ulrike Roettig、Gema Sanz Gil、Erich Seger、David J. Steggles、Jutta Wanner、Andreas G. Weichert
DOI:10.1016/j.tetlet.2006.02.110
日期:2006.4
A synthetic route towards cyclopropylic compounds, which act as glucokinase activators is described herein. The present synthesis gives easy and rapid access to a wide variety of either sulfones or sulfonamides starting from readily available late-stage intermediates. (c) 2006 Elsevier Ltd. All rights reserved.