Mild Fluorination of Chloropyridines with in Situ Generated Anhydrous Tetrabutylammonium Fluoride
作者:Laura J. Allen、Joseck M. Muhuhi、Douglas C. Bland、Rachel Merzel、Melanie S. Sanford
DOI:10.1021/jo5003054
日期:2014.6.20
This paper describes the fluorination of nitrogen heterocycles usinganhydrous NBu4F. Quinoline derivatives as well as a number of 3- and 5-substituted pyridines undergo high-yielding fluorination at room temperature using this reagent. These results with anhydrous NBu4F compare favorably to traditional halex fluorinationsusing alkali metal fluorides, which generally require temperatures of ≥100 °C
Anhydrous Tetramethylammonium Fluoride for Room-Temperature S<sub>N</sub>Ar Fluorination
作者:Sydonie D. Schimler、Sarah J. Ryan、Douglas C. Bland、John E. Anderson、Melanie S. Sanford
DOI:10.1021/acs.joc.5b02075
日期:2015.12.18
This paper describes the room-temperature SNAr fluorination of aryl halides and nitroarenes usinganhydrous tetramethylammonium fluoride (NMe4F). This reagent effectively converts aryl-X (X = Cl, Br, I, NO2, OTf) to aryl-F under mild conditions (often room temperature). Substrates for this reaction include electron-deficient heteroaromatics (22 examples) and arenes (5 examples). The relative rates
本文介绍了使用无水四甲基氟化铵(NMe 4 F)在室温下对芳基卤化物和硝基芳烃进行S N Ar氟化。该试剂在温和的条件下(通常在室温下)有效地将芳基-X(X = Cl,Br,I,NO 2,OTf)转化为芳基-F。该反应的底物包括缺电子的杂芳族化合物(22个实例)和芳烃(5个实例)。反应的相对速率随X以及底物的结构而变化。但是,一般而言,带有X = NO 2的基材或Br反应最快。在所检查的所有情况下,这些反应的产率均与在升高的温度(即,更传统的卤代氟化条件)下使用CsF所获得的产率相当或更好。反应还提供了可比较的产量,规模从100 mg到10 g不等。进行了成本分析,结果表明,使用NMe 4 F进行氟化处理通常比使用CsF进行氟化处理更具成本效益。
[EN] PROCESS FOR FLUORINATING COMPOUNDS<br/>[FR] PROCÉDÉ DE FLUORATION DE COMPOSÉS
申请人:DOW AGROSCIENCES LLC
公开号:WO2017024167A1
公开(公告)日:2017-02-09
Disclosed are mild temperature (e.g., from 0 to 80°C) SNAr fluorinations of a variety of halide and sulfonate substituted aryl and heteroaryl substrates using NMe4F.
Nucleophilic Deoxyfluorination of Phenols via Aryl Fluorosulfonate Intermediates
作者:Sydonie D. Schimler、Megan A. Cismesia、Patrick S. Hanley、Robert D. J. Froese、Matthew J. Jansma、Douglas C. Bland、Melanie S. Sanford
DOI:10.1021/jacs.6b12911
日期:2017.2.1
This report describes a method for the deoxyfluorination of phenols with sulfuryl fluoride (SO2F2) and tetramethylammonium fluoride (NMe4F) via aryl fluorosulfonate (ArOFs) intermediates. We first demonstrate that the reaction of ArOFs with NMe4F proceeds under mild conditions (often at room temperature) to afford a broad range of electronically diverse and functional group-rich aryl fluoride products
Multiple Approaches to the In Situ Generation of Anhydrous Tetraalkylammonium Fluoride Salts for S<sub>N</sub>Ar Fluorination Reactions
作者:Megan A. Cismesia、Sarah J. Ryan、Douglas C. Bland、Melanie S. Sanford
DOI:10.1021/acs.joc.7b00481
日期:2017.5.19
focuses on the development of practical approaches to the in situ generation of anhydrous fluoride salts for applications in nucleophilic aromatic substitution (SNAr) reactions. We report herein that a variety of combinations of inexpensive nucleophiles (e.g., tetraalkylammonium cyanide and phenoxide salts) and fluorine-containing electrophiles (e.g., acid fluoride, fluoroformate, benzenesulfonyl fluoride
本文主要讨论的实际方法的原位生成无水氟化氢的盐的发展在亲核芳族取代(S应用Ñ AR)的反应。我们在此报告,廉价的亲核试剂(例如,四烷基氰化铵和酚盐)和含氟亲电试剂(例如,酰基氟,氟甲酸酯,苯磺酰氟和芳基氟磺酸酯衍生物)的多种组合对这种转化有效。最终,我们证明了2,6-二甲基苯氧基四甲基铵和硫酰氟(SO 2 F 2)的组合是制备无水四甲基氟化铵的一种特别实用的方法。此过程适用于S NAr氟化一系列电子不足的芳基和杂芳基氯化物以及硝基芳烃。