Palladium-catalyzed alkenation of thiophenes and furans by regioselective C–H bond functionalization
摘要:
A palladium-catalyzed direct alkenation of thiophenes and furans has been developed in the presence of AgOAc and pyridine. A variety of olefinic substrates such as acrylates, acrylamides, and acrylonitrile can perform the direct oxidative coupling reactions with various thiophenes and furans to give the mono-alkenylated products in good yields. In most cases, the (E)-isomers were isolated as the major products. (C) 2009 Elsevier Ltd. All rights reserved.
A Palladium NNC-Pincer Complex as an Efficient Catalyst Precursor for the Mizoroki−Heck Reaction
作者:Go Hamasaka、Shun Ichii、Yasuhiro Uozumi
DOI:10.1002/adsc.201800099
日期:2018.5.2
The Mizoroki−Heckreaction of aryl halides (iodides, bromides, or chlorides) with activated alkenes in the presence of a palladium NNC‐pincer complex at ppb to ppm loadings gave the corresponding internal alkenes in excellent yields. The total turnover number and turnover frequency reached up to 8.70×108 and 1.21×107 h−1 (3.36×103 s−1), respectively. The catalyst was applied in a ten‐gram‐scale synthesis
芳族卤化物(碘化物,溴化物或氯化物)与活性烯烃在钯NNC-钳夹配合物(ppb)至ppm负载量下的Mizoroki-Heck反应得到了相应的内部烯烃,收率很好。总周转次数和周转频率分别达到8.70×10 8和1.21×10 7 h -1(3.36×10 3 s -1)。该催化剂用于UV-B防晒剂辛诺酸酯(2-乙基己基4-甲氧基肉桂酸酯)的10克级合成。反应速率分析,反应混合物的透射电子显微镜检查和中毒试验表明,单体钯物质是催化循环中的催化活性物质。
Mizoroki–Heck reactions catalyzed by palladium dichloro-bis(aminophosphine) complexes under mild reaction conditions. The importance of ligand composition on the catalytic activity
作者:Miriam Oberholzer、Christian M. Frech
DOI:10.1039/c3gc40493e
日期:——
Dichloro-bis(aminophosphine) complexes of palladium with the general formula [(P(NC5H10)3−n(C6H11)n})2Pd(Cl)2] (where n = 0–2) are easily accessible, cheap and air stable, highlyactive and universally applicable C–C cross-coupling catalysts, which exhibit an excellentfunctionalgrouptolerance. The ligand composition of amine-substituted phosphines (controlled by the number of P–N bonds) was found
通式为[[P (NC 5 H 10)3- n(C 6 H 11)n })2 Pd(Cl)2 ]的钯的二氯双(氨基膦)配合物(其中n = 0–2)易于获得,价格低廉且空气稳定,高度活跃且通用的C–C交叉耦合催化剂,具有出色的官能团耐受性。这配体 组成 胺取代的 膦类 (受P–N键的数量控制)被发现可以有效地确定其在Heck反应中的催化活性,为此 纳米粒子被证明是它们的催化活性形式。二氯bis [bis [1,1',1''-(膦三基)三哌啶]]钯(1)质子)在[(P (NC 5 H 10)3- n(C 6 H 11)n })2 Pd(Cl)2 ](其中n = 0–3)系列中,是一个高活性的Heck催化剂 在100°C的温度下,因此是有效且通用的Heck的罕见例子 催化剂可以在温和的反应条件下(100°C或更低)有效运行,对于二氯-双(1,1'-(环己基膦基二基)二哌啶)钯(2,n = 1
[Bmim]NTf<sub>2</sub>, a Low Viscosity Ionic Liquid is a Viable Reaction Medium for Pd-Catalyzed Cross-Coupling Reactions
作者:Ilhyong Ryu、Shifang Liu、Takahide Fukuyama、Masaaki Sato
DOI:10.1055/s-2004-829552
日期:——
A low viscosity ionic liquid [bmim]NTf 2 was successfully used as a reaction medium in Pd-catalyzed Mizoroki-Heck, Suzuki-Miyaura and Stille coupling reactions. The yields are good to high, and comparable to those reported previously for high viscosity ionic liquids, such as [bmim]PF 6 and [bmim]BF 4 . The products are readily separated and a reaction medium containing the Pd-carbene catalyst was successfully
A tailored polymeric cationic tag–anionic Pd(<scp>ii</scp>) complex as a catalyst for the low-leaching Heck–Mizoroki coupling in flow and in biomass-derived GVL
A new polystyrene-type resin loaded with pincer-type imidazolium ionic tag has been very effective in the immobilization of [PdCl4]2− palladium complex leading to a very low leaching of the metal during its use in flow.
Palladium-Catalyzed Intermolecular Three-Component Coupling of Aryl Iodides, Alkynes, and Alkenes To Produce 1,3-Butadiene Derivatives
作者:Kana Shibata、Tetsuya Satoh、Masahiro Miura
DOI:10.1021/ol0503743
日期:2005.4.1
[reaction: see text] The sequential three-componentcoupling of aryl iodides, diarylacetylenes, and monosubstituted alkenes effectively proceeds in the presence of Pd(OAc)(2), LiCl, and NaHCO(3) as catalyst, promoter, and base, respectively, in DMF-H(2)O to produce the corresponding 1,3-butadiene derivatives.