Organogold(I) Phosphanes in Palladium-Catalyzed Cross-Coupling Reactions in Aqueous Media
作者:Miguel Peña-López、Luis A. Sarandeses、José Pérez Sestelo
DOI:10.1002/ejoc.201201720
日期:2013.5
Cross-coupling reaction of organogold(I) phosphanes with organic electrophiles in aqueousmedia has been investigated. Reactions between isolated aryl-, alkenyl-, or alkynylgold(I) phosphanes and aryl halides or triflates, alkenyl halides, and allyl acetates proceed under palladium catalysis conditions at room temperature or 80 °C in water with THF as a co-solvent. The couplingreactions give good yields
Palladium-Catalyzed Cross-Coupling Reactions of Organogold(I) Reagents with Organic Electrophiles
作者:Miguel Peña-López、Miguel Ayán-Varela、Luis A. Sarandeses、José Pérez Sestelo
DOI:10.1002/chem.201000726
日期:2010.8.23
The palladium‐catalyzed cross‐coupling reaction of organogold(I) reagents (alkyl, alkenyl, aryl, and alkynyl) with organic electrophiles, such as aryl and alkenyl halides, aryl triflates, benzyl bromide, and benzoyl chloride is reported. The reaction takes place, under palladiumcatalysis, at room temperature with short reaction times to give the corresponding cross‐coupling products in high yields
Cross-coupling reaction of organosilicon nucleophiles
申请人:——
公开号:US20020183516A1
公开(公告)日:2002-12-05
Improved methods for generating a —C—C— bond by cross-coupling of a transferable group with an acceptor group. The transferable group is a substituent of an organosilicon nucleophile and the acceptor group is provided as an organic electrophile. The reaction is catalyzed by a Group 10 transition metal complex (e.g., Ni, Pt or Pd), particularly by a palladium complex. Certain methods of this invention use improved organosilicon nucleophiles which are readily prepared, can give high product yields and exhibit high stereo selectivity. Methods of this invention employ activating ions such as halides, hydroxide, hydride and silyloxides. In specific embodiments, organosilicon nucleophilic reagents of this invention include siloxanes, particularly cyclic siloxanes. The combination of the cross-coupling reactions of this invention with ring-closing metathesis, hydrosilylation and intramolecular hydrosilylation reactions provide useful synthetic strategies that have wide application.
alternatives to Wittig chem-istry are needed to construct olefins from carbonyl compounds, but none have been developed to-date. Here we report an atom-economical olefination of carbonyls via aldol-decarbonylative coupling of aldehydes using robust and recyclable supported Pd catalysts, producing only CO and H2O as waste. The reaction affords homocoupling of aliphatic al-dehydes, as well as heterocoupling
需要新的原子经济替代 Wittig 化学来从羰基化合物构建烯烃,但迄今为止还没有开发出来。在这里,我们报告了使用坚固且可回收的负载型 Pd 催化剂通过醛的醛醇-脱羰基偶联实现羰基的原子经济烯化,仅产生 CO 和 H2O 作为废物。该反应提供了脂肪族醛的同偶联,以及脂肪族和芳香族醛的杂偶联。计算可以深入了解反应的选择性和热力学。串联羟醛脱羰反应为探索新的羰基反应以构建烯烃打开了大门。
Stereoselective Cross‐Coupling of Grignard Reagents and Conjugated Dienylbromides using Iron Salts with Magnesium Alkoxides
Synthesis of dienic scaffolds by Fe-mediated coupling between Grignardreagents and dienyl bromides is reported. This methodology involves the use of magnesium alkoxides as additives, and can be applied to targets of industrial interest, such as insect pheromones. Mechanistic studies suggest that the active species is an organoiron(II) complex, showing that no reduction of the precursor to low oxidation
报道了通过格氏试剂和二烯基溴之间的 Fe 介导的偶联合成二烯支架。该方法涉及使用烷氧基镁作为添加剂,并且可以应用于具有工业意义的目标,例如昆虫信息素。机理研究表明,活性物质是一种有机铁 (II) 复合物,表明不需要将前体还原为低氧化态。