Efficient Palladium-Catalyzed Nucleophilic Addition of Triorganoindium Reagents to Carbocyclic Derivatives
摘要:
Palladium (0)-catalyzed allylic substitution reactions employing triorganoindium reagents have been investigated. In situ generated vinyl- and arylindiums react with substituted and unsubstituted cyclohex-2-enyl esters in the presence of 1-3 mol % Pd-2(dba)(3) to produce vinyl- or arylcyclohexenes in moderate to excellent yields. The stereoselectivity of this process was also examined, and evidence is presented that the reaction proceeds with inversion of stereochemical configuration.
Fluoride-Promoted Cross-Coupling of Chloro(mono-, di-, or triphenyl)germanes with Aryl Halides in “Moist” Toluene. Multiple Transfer of the Phenyl Group from Organogermane Substrates and Comparison of the Coupling Efficiencies of Chloro(phenyl)germanes with their Corresponding Stannane and Silane Counterparts
作者:Jean-Philippe Pitteloud、Zun-Ting Zhang、Yong Liang、Laura Cabrera、Stanislaw F. Wnuk
DOI:10.1021/jo101848f
日期:2010.12.3
efficient activation by fluoride to promote transfer of one, two, or three phenyl groups from the organogermanes. The corresponding chlorophenylstannanes were found to be more reactive than chlorophenylsilanes, which in turn were more effective than chlorophenylgermanes. One chloride ligand on the Ge or Si center allows efficient activation by fluoride to promote transfer of up to three aryl groups
三氯苯基-、二氯二苯基-和氯三苯基锗烷在四丁基氟化铵的甲苯中加入测量的水量。Ge 中心的一个氯化物配体允许氟化物有效活化,以促进一个、两个或三个苯基基团从有机锗烷转移。发现相应的氯苯基锡烷比氯苯基硅烷更具反应性,而氯苯基硅烷又比氯苯基锗烷更有效。Ge 或 Si 中心的一个氯化物配体允许氟化物有效活化,以促进多达三个芳基从锗烷或硅的转移。然而,Sn 中心不需要卤配体,因为在氟化物促进的与芳基卤化物的偶联过程中,四苯基锡有效地转移了多达四个苯基。19 F NMR 研究表明,氟苯基锗烷和高价锗酸盐物质的形成可能是中间体。
Convenient Processes for the Synthesis of Aromatic Ketones from Aryl Bromides and Carboxylic Anhydrides Using a Cobalt Catalysis
various para- and meta-substituted aromatic bromides, mostly bearing sensitive moieties, with several carboxylic acid anhydrides is reported. This reaction can be carried out in two steps, by forming an aromatic organozinc reagent via cobalt catalysis in the first step, or even more interestingly in a single step, also by using a cobalt-based catalyst. The aromaticketones are obtained by these new, mild
A novel and efficient catalyst system was developed for homocouplingreactions of aryl halides. The catalyst system consists of Pd(OAc)2 and the peppery sensory component of tobacco leaves. This is the first time that a sensory component has been used in an organic reaction. Experiments using the catalyst system showed that the reactions proceeded smoothly under air in the absence of both an additional
Fast, Efficient and Low E-Factor One-Pot Palladium-Catalyzed Cross-Coupling of (Hetero)Arenes
作者:Erik B. Pinxterhuis、Paco Visser、Iwan Esser、Jean-Baptiste Gualtierotti、Ben L. Feringa
DOI:10.1002/anie.201707760
日期:2018.7.20
coupling partner. These polyaromatic structures are obtained in high yields, in 10 min at room temperature, with minimal waste generation (E‐factors as low as 1.5) and without the need for strict inert conditions, making this process highly efficient and practical in comparison to classical methods. As illustration, several key intermediates of widely used BINOL‐derived structures are readily prepared
Cobalt−Xantphos-Catalyzed, LiCl-Mediated Preparation of Arylzinc Reagents from Aryl Iodides, Bromides, and Chlorides
作者:Meng-Yi Jin、Naohiko Yoshikai
DOI:10.1021/jo102417x
日期:2011.4.1
A cobalt−Xantphos-catalyzed, LiCl-mediated system has been developed for the direct and expedient preparation of arylzinc reagents in THF from the corresponding aryl iodides, bromides, and chlorides. Owing to the use of THF as a versatile solvent, the thus-formed arylzinc reagents displayed a high degree of compatibility with a variety of conventional as well as newly emerging metal-catalyzed cross-coupling