Palladium(II) complex for catalyzing sonogashira coupling reactions and a method thereof
申请人:KING FAHD UNIVERSITY OF PETROLEUM AND MINERALS
公开号:US09546191B1
公开(公告)日:2017-01-17
A palladium(II) complex which catalyzes the Sonogashira coupling reaction efficiently under aerobic condition and a method of employing the palladium(II) complex to synthesize internal alkynes. The palladium(II) complex is an effective catalyst for the coupling reactions of aryl iodo and diiodo compounds with unactivated alkyl alkynes and terminal dialkynes to produce various novel symmetrical dialkynes and disubstituted internal alkynes in excellent yields.
Alkynyl−B(dan)s in Various Palladium‐Catalyzed Carbon−Carbon Bond‐Forming Reactions Leading to Internal Alkynes, 1,4‐Enynes, Ynones, and Multiply Substituted Alkenes
reactions can be achieved as more convenient one‐pot reactions, without isolating the alkynyl−B(dan) formed in situ by the zinc‐catalyzed dehydrogenative borylation of alkynes with HB(dan). In addition to direct C(sp)−B(dan) bond transformations, the C≡C bond in an alkynyl−B(dan) proved to be a promising scaffold for the construction of a multisubstituted alkene, which is synthesized by diboration of the
发现炔基-B(dan)s的C(sp)-B(dan)键可直接用于钯催化的芳基(烯基)卤化物和烯丙基碳酸酯作为亲电子试剂的碳-碳键形成反应,因此分别产生不对称的内部炔烃和未共轭的1,4-炔烃。使用酰氯作为亲电子试剂,钯催化剂在铜助催化剂的辅助下也可以促进炔酮的合成。这些反应可作为更方便的单锅反应来实现,而无需分离通过炔烃与HB(dan)进行锌催化脱氢硼化反应而原位形成的炔基-B(dan)。除了直接C(sp)-B(dan)键的转变,炔基-B(dan)中的C≡C键被证明是构建多取代烯烃的有前途的支架,该多取代烯烃通过C≡C-B(dan)的硼烷基化反应合成)部分,导致三硼烷基烯烃,随后发生区域和立体选择性的Suzuki-Miyaura交叉交叉偶联反应。举一个例子,合成具有四个不同芳基的乙烯,p- MeC 6 H 4,p- MeOC 6 H 4,p- NCC 6 H 4和p- F 3 CC 6 H 4
Sulfur-Mediated Electrophilic Cyclization of Aryl-Substituted Internal Alkynes
作者:Zhong Zhang、Pan He、Hongguang Du、Jiaxi Xu、Pingfan Li
DOI:10.1021/acs.joc.9b00136
日期:2019.4.5
A sulfur-mediated electrophiliccyclization reaction of aryl-tethered internal alkynes has been developed. Triflic anhydride-activated sulfoxides induced the electrophiliccyclization and then demethylation with triethylamine in one pot, affording 3-sulfenyl-1,2-dihydronaphthalenes and related types of products in yields of ≤96%.
Gold‐Catalyzed 1,2‐Dicarbofunctionalization of Alkynes with Organohalides**
作者:Shashank P. Sancheti、Yukta Singh、Manoj V. Mane、Nitin T. Patil
DOI:10.1002/anie.202310493
日期:2023.10.16
The first report of 1,2-dicarbofunctionalization of alkynes using organohalides as coupling partners in the field of goldcatalysis has been presented. Mechanistic investigations, including NMR, tandem mass spectrometry and DFT studies, reveal that an oxidative addition/carbophilic activation pathway is preferred over the migratory insertion/cis-trans isomerization pathway.
Synthesis of functionalized alkynes via palladium-catalyzed Sonogashira reactions
作者:Mansur B. Ibrahim、Bassam El Ali、Imran Malik、Mohammed Fettouhi
DOI:10.1016/j.tetlet.2015.12.086
日期:2016.2
A highly efficient protocol for the copper and phosphine free Sonogashira cross-coupling reactions of aryl iodides with terminal alkynes under aerobic conditions has been developed. Using 1 mol % of the palladium-bis(oxazoline) complex, Pd-BOX A, in the presence of KOH, and a CH3CN-H2O solvent system allowed for the cross -coupling reactions to proceed at room temperature or 60 degrees C. This new catalytic system was found to be highly active for the cross-coupling reaction of aryl diiodo substrates with unactivated alkyl alkynes to produce various symmetrical dialkynes, as well as for the cross -coupling of terminal dialkynes with aryl iodides to generate symmetrical disubstituted internal alkynes. (C) 2015 Elsevier Ltd. All rights reserved.