Copper-Mediated Fluorination of Arylboronate Esters. Identification of a Copper(III) Fluoride Complex
摘要:
A method for the direct conversion of arylboronate esters to aryl fluorides under mild conditions with readily available reagents is reported. Tandem reactions have also been developed for the fluorination of arenes and aryl bromides through arylboronate ester intermediates. Mechanistic studies suggest that this fluorination reaction occurs through facile oxidation of Cu(I) to Cu(III), followed by rate-limiting transmetalation of a bound arylboronate to Cu(III). Fast C-F reductive elimination is proposed to occur from an aryl- copper(III)-fluoride complex. Cu(III) intermediates have been generated independently and identified by NMR spectroscopy and ESI-MS.
Synthesis and Reactivity of α‐Cumyl Bromodifluoromethanesulfenate: Application to the Radiosynthesis of [
<sup>18</sup>
F]ArylSCF
<sub>3</sub>
作者:Jiang Wu、Qunchao Zhao、Thomas C. Wilson、Stefan Verhoog、Long Lu、Véronique Gouverneur、Qilong Shen
DOI:10.1002/anie.201813708
日期:2019.2.18
A highly reactive electrophilic bromodifluoromethylthiolating reagent, α-cumyl bromodifluoro-methanesulfenate 1, was prepared to allow for direct bromodifluoromethylthiolation of aryl boron reagents. This coupling reaction takes place under copper catalysis, and affords a large range of bromodifluoromethylthiolated arenes. These compounds are amenable to various transformations including halogen exchange
Regioselective and Stereospecific Cross-Coupling of Primary Allylic Amines with Boronic Acids and Boronates through Palladium-Catalyzed CN Bond Cleavage
作者:Man-Bo Li、Yong Wang、Shi-Kai Tian
DOI:10.1002/anie.201109171
日期:2012.3.19
The NH2 group serves as an effective leaving group in the palladium‐catalyzed regioselective and stereospecific title reaction (see scheme). The reaction works well with aryl‐ and alkenylboronic acids and aryl‐, alkenyl‐, allyl‐, and benzylboronates, and complete transfer of chirality has been achieved when using α‐chiral primary allylic amines as the allylic electrophiles.
The present invention provides compounds of Formula I,
1
including pharmaceutically acceptable salts and/or prodrugs thereof, where G, R
2
, and R
3
are defined as described herein.
本发明提供了公式I的化合物,包括其药学上可接受的盐和/或前药,其中G、R2和R3的定义如本文所述。
Miyaura Borylations of Aryl Bromides in Water at Room Temperature
作者:Bruce H. Lipshutz、Ralph Moser、Karl R. Voigtritter
DOI:10.1002/ijch.201000045
日期:2010.12
New technology for palladium‐catalyzed cross‐couplings between B2pin2 and arylbromides leading to arylboronates is described. Micellar catalysis serves to enable borylations to take place in water as the only medium at ambient temperatures.
描述了钯催化 B 2 pin 2和芳基溴化物之间交叉偶联产生芳基硼酸酯的新技术。胶束催化作用是使硼酸化能够在环境温度下在作为唯一介质的水中发生。
Room temperature Pd(0)/Ad3P-catalyzed coupling reactions of aryl chlorides with bis(pinacolato)diboron
作者:Jie Dong、Hui Guo、Wei Peng、Qiao-Sheng Hu
DOI:10.1016/j.tetlet.2019.01.042
日期:2019.3
Pd(0)/Ad3P-catalyzed cross-coupling reactions of aryl chlorides with bis(pinacolato)diboron are described. The Pd(0)/Ad3P catalyst, generated from Ad3P-coordinated acetanilide-based palladacycle complex, proved to be an efficient catalyst system for the Miyaura borylation reactions of a variety of aryl chlorides with bis(pinacolato)diboron. The mild reaction condition, the easy availability of the catalyst
描述了室温下Pd(0)/ Ad 3 P催化的芳基氯化物与双(频哪醇)二硼的交叉偶联反应。由Ad 3 P配位的对乙酰苯胺基palladacycle配合物生成的Pd(0)/ Ad 3 P催化剂被证明是一种有效的催化剂体系,用于多种芳基氯化物与双(频哪醇)二硼烷的Miyaura硼酸酯化反应。温和的反应条件,容易获得的催化剂以及良好的偶联收率使得这些反应潜在地可用于有机合成中。