Nickel or Iron Catalysed Carbon-Carbon Coupling Reaction of Arylenes, Alkenes and Alkines
申请人:knochel Paul
公开号:US20100184977A1
公开(公告)日:2010-07-22
Organozinc compounds of the type R
1
—Ar
1
—ZnY (1) can be reacted with different functionalized aryl halides R
2
—Ar
2
—X (2) in the presence of catalytic amounts of Ni or Fe in a polar solvent or solvent mixture to form polyfunctional biaryles of the type R
1
—Ar
1
—Ar
2
—R
2
(3). Organozinc compounds of the type (1) can be represented by the transmetallation reaction of functionalized aryl magnesium halides or lithium aryl compounds with e.g. ZnBr
2
.
Potassium-base-mediated defluoroetherification of aryl and heteroaryl fluorides with alkoxyboronic acidpinacolesters under transition-metal-free conditions is reported. This protocol efficiently and safely provides a wide variety of aryl ethers in high yields without using metal catalysts, specific ligands, and harsh conditions to selectively forge Csp2–O bonds via the Csp2–F cleavage. This method
报道了在无过渡金属条件下,钾基介导的芳基和杂芳基氟化物与烷氧基硼酸频哪醇酯的脱氟醚化反应。该协议以高产率高效安全地提供多种芳基醚,无需使用金属催化剂、特定配体和苛刻条件,通过 C sp2 -F 裂解选择性地形成 C sp2 -O 键。该方法可应用于结构复杂的C sp2 -氟化物和生物活性醇如β-雌二醇、骨化醇和生育酚的后期醚化。
In situ Diazonium Salt Formation and Photochemical Aryl‐Aryl Coupling in Continuous Flow Monitored by Inline NMR Spectroscopy
作者:Christoph Deckers、Thomas H. Rehm
DOI:10.1002/chem.202303692
日期:2024.5.28
for biphenyls are an underrated aryl radical source for the photochemical aryl-aryl coupling. This concept does not require any additional catalysts to perform an efficient and selective reaction. The photoarylation is supported by the application of Flow Chemistry using microreactors and modern LED technology. An integrated benchtop NMR spectrometer enables real-time analysis of the substituted products
联苯的三氟乙酸重氮盐是用于光化学芳基-芳基偶联的被低估的芳基自由基源。这个概念不需要任何额外的催化剂来进行有效和选择性的反应。使用微反应器和现代 LED 技术的流动化学应用支持光芳基化。集成台式核磁共振波谱仪可以对替代产品进行实时分析。
[DE] NICKEL- ODER EISEN-KATALYSIERTE KOHLENSTOFF-KOHLENSTOFF-KUPPLUNGSREAKTION VON ARYLENEN, ALKENEN UND ALKINEN<br/>[EN] NICKEL OR IRON CATALYSED CARBON-CARBON COUPLING REACTION OF ARYLENES, ALKENES AND ALKINES<br/>[FR] REACTION DE COUPLAGE CARBONE-CARBONE ENTRE ARYLENES, ALCENES ET ALCYNES, CATALYSEE PAR NICKEL OU FER
申请人:UNIV MUENCHEN L MAXIMILIANS
公开号:WO2007031511A1
公开(公告)日:2007-03-22
[EN] According to the invention, organozink compounds of R1-Ar1-ZnY (1) type are convertible, with different functionalised aryl halides R2-Ar2-X (2) in the presence of Ni or Fe catalytic quantities in a polar solvent or a polar solvent mixture, into a polyfunctional biarylene of R1-Ar1-AR2-R2 (3) type. The type (1) organic compounds are obtainable by a transmetallisation reaction of aryl-magnesium halides or lithium-aryl compounds, for example with ZnBr2. [FR] Selon l'invention, des composés organozinciques du type R1 -Ar1-ZnY (1), peuvent est convertis avec différents halogénures d'aryle fonctionnalisés R2-Ar2-X (2), en la présence de quantités catalytiques de Ni ou de Fe, dans un solvant polaire ou un mélange de solvants polaires, en biarylène polyfonctionnel du type R1-Ar1-AR2-R2 (3). Des composés organozinciques du type (1) peuvent être obtenus par la réaction de transmétallisation d'halogénures d'arylmagnésium fonctionnalisés ou de composés de lithiumaryle, par ex. avec ZnBr2. [DE] Organozink- Verbindungen des Typs R1 -Ar1-ZnY (1) lassen sich mit verschiedenen funktionalisierten Arylhalogeniden R2-Ar2-X (2) in Gegenwart katalytischer Mengen von Ni oder Fe in einem polaren Lösungsmittel oder Lösungsmittelgemisch zu polyfunktionalen Biarylen des Typs R1-Ar1-AR2-R2 (3) umsetzen. Organozink- Verbindungen des Typs (1) können durch die Transmetallierungsreaktion funktionalisierter Arylmagnesiumhalogenide oder Lithiumarylverbindungen mit z.B. ZnBr2 dargestellt werden.