Three-Component One-Pot Synthesis of Unsymmetrical Diarylalkynes by Thermocontrolled Sequential Sonogashira Reactions Using Potassium Ethynyltrifluoroborate
作者:Taejung Kim、Kyu Hyuk Jeong、Youngseok Kim、Taesub Noh、Jaeyoung Choi、Jungyeob Ham
DOI:10.1002/ejoc.201700110
日期:2017.5.3
Sonogashira reactions with potassium ethynyltrifluoroborate and two different reactive aryl halides. The one-pot procedure was initiated by the palladium/copper-catalyzed Sonogashira coupling of potassium ethynyltrifluoroborate to an aryliodide or electron-deficient aryl bromide at 40 °C. Following a subsequent deboronative Sonogashira reaction of the in situ generated potassium (arylethynyl)trifluoroborate
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
Cellulose/silica supported Schiff base Pd(II) catalyst for copper-free Sonogashira cross-coupling
作者:Pravin S. Pharande、Pradeep M. Mhaldar、Mayuri V. Patil、Suraj A. Sonawane、Shrikrishna T. Salunke、Dattaprasad M. Pore
DOI:10.1007/s11164-023-05186-1
日期:2024.2
Sonogashira cross-coupling. Varity of functionalized diary acetylene derivatives have been achieved with admirable yields from coupling of aryl halides and phenyl acetylenes. The XRD, SEM and TGA analysis of recycledcatalyst revealed remarkable catalytic activity. The proposed approach exhibits remarkable merits such as impressively low catalyst loading (0.009 mol%), elevated turnover numbers (up to 10