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
Catalytic, oxidant-free, direct olefination of alcohols using Wittig reagents
作者:E. Khaskin、D. Milstein
DOI:10.1039/c5cc02902c
日期:——
Catalytic acceptorless coupling of alcohols with in situ generated phosphonium ylides forms olefins and H2, with significant stereospecificity.
醇与原位生成的磷鎓叶立德的催化无受体偶联形成具有显着立体特异性的烯烃和H 2。
Stereospecific Palladium-Catalyzed Cross-Coupling of (<i>E</i>)- and (<i>Z</i>)-Alkenylsilanolates with Aryl Chlorides
作者:Scott E. Denmark、Jeffrey M. Kallemeyn
DOI:10.1021/ja065988x
日期:2006.12.1
geometrically defined (E)- and (Z)-alkenyl- and styrylsilanolates with a wide variety of aromatic and heteroaromatic chlorides has been achieved. Under catalysis by bulky, biphenyl-derived phosphines and allylpalladium chloride, the (preformed, stable) potassium salts of di-, tri- and tetrasubstituted alkenyldimethylsilanols undergo high yielding and highly stereospecific coupling to aryl chlorides in THF or dioxane
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。