A palladium salen complex: an efficient catalyst for the Sonogashira reaction at room temperature
作者:Ankur Gogoi、Anindita Dewan、Geetika Borah、Utpal Bora
DOI:10.1039/c4nj01822b
日期:——
A tetradentate Schiff base derived palladium complex has been developed as a catalyst for the roomtemperature Sonogashira reaction under copper free conditions. The main catalytic species, a Pd-complex was derived from Schiff base ligand N,N′-bis(salicylidene)-arylmethanediamine and Pd(OAc)2. Electron rich, electron deficient and sterically hindered aryl iodides underwent smooth coupling to afford
Elite cliques: Palladiumclusters with three and four atoms were found to be the catalyticallyactivespecies for ligand‐free palladium‐catalyzed CC bond‐forming reactions (see picture). These palladiumclusterspecies could be stabilized in water and stored for long periods of time for use on demand with no loss of activity. High yields of products and turnover frequencies (TOFs) of up to 105 h−1
精英集团:发现具有三个和四个原子的钯簇是无配体钯催化的CC键形成反应的催化活性物种(见图)。这些钯簇物种可以在水中稳定下来,并可以长期保存,以供按需使用,而不会损失活性。观察到高产量的产品和高达10 5 h -1的周转频率(TOF)。
Binuclear Pd(I)–Pd(I) Catalysis Assisted by Iodide Ligands for Selective Hydroformylation of Alkenes and Alkynes
is driven by a novel activation strategy and features a unique Pd(I)-Pd(I) mechanism, involving an iodide-assisted binuclear step to release the product. This method enables β-selective hydroformylation of a large range of alkenes and alkynes, including sensitive starting materials. Its utility is demonstrated in the synthesis of antiobesity drug Rimonabant and anti-HIV agent PNU-32945. In a broader
Urea as mild and efficient additive for palladium catalyzed Sonogashira cross coupling reaction
作者:Manashi Sarmah、Anindita Dewan、Ashim J. Thakur、Utpal Bora
DOI:10.1016/j.tetlet.2016.01.046
日期:2016.2
for Sonogashira cross coupling of arylhalides with terminalalkynes at room temperature. This catalytic system effectively promotes Sonogashira coupling of both aryl iodides and aryl bromides to give polyfunctional alkynesunder copper and amine free conditions. The catalytic system is readily accessible, inexpensive and highly flexible for both aromatic and aliphatic alkynes.
A green protocol for ligand, copper and base free Sonogashira cross-coupling reaction
作者:Anindita Dewan、Manashi Sarmah、Utpal Bora、Ashim J. Thakur
DOI:10.1016/j.tetlet.2016.07.021
日期:2016.8
developed for palladium catalyzed Sonogashiracross-couplingreaction under mild and greenreaction conditions. The reaction is catalyzed by an in situ generated catalytic system based on Pd(OAc)2 and WEB (water extract of banana peels ash) in the absence of any organic or inorganic base, ligand and copper salt with excellent yield of cross coupled product. The reaction condition is compatible with electronically