Monoallylation and monoalkylation of diketones and β-keto esters with allylic and benzylic alcohols catalysed by [Cp*Co(CH3CN)3][SbF6]2 (I) are reported. The method does not require any additive and affords regioselective products. The mechanistic investigations were done by in situ 1H NMR spectroscopy as well as control experiments. It has been shown that reactions proceed via η3-allyl complex formation or
报道了[Cp*Co(CH 3 CN) 3 ][SbF 6 ] 2 ( I )催化的二酮和β-酮酯与烯丙醇和苄醇的单烯丙基化和单烷基化。该方法不需要任何添加剂并提供区域选择性产物。通过原位1 H NMR 光谱以及对照实验进行了机理研究。已表明反应通过形成 η 3 -烯丙基络合物或烯丙基醚中间体进行。烷基化仅通过醚中间体发生。所得烯丙基化和烷基化产物已用于合成十一种新的三取代吡唑和一种吡唑啉酮。
Allylic substitution in water catalyzed by amphiphilic resin-supported palladium-phosphine complexes
New amphiphilicresin-supported triarylphosphines PEP (1) were designed and prepared on polyethylene glycol-polystyrene graft copolymer (PEG-PS). Palladiumcomplexes of 1, Pd(PEP)2 (4) and Pd(PEP) (5), catalyzed allylicalkylation of 3-acetoxy-1,3-diphenyl-1-propene (6) and cinnamyl acetate (7) with various nucleophiles including 1,3-dicarbonyl compounds, amino acids, sodium azide, and sodium sulfinate
Green and Scalable Palladium-on-Carbon-Catalyzed Tsuji-Trost Coupling Reaction Using an Efficient and Continuous Flow System
作者:Clément Cazorla、Muriel Billamboz、Hervé Bricout、Eric Monflier、Christophe Len
DOI:10.1002/ejoc.201601311
日期:2017.2.10
continuous flow Tsuji-Trost coupling reaction between allylic compounds and various nucleophiles was successfully achieved within only ca. 40 s during the single-pass through a cartridge filled with palladium on carbon (Pd/C). Two methods have been designed using the H-cube ThalesNano technology and enable the efficient production of add-valued compounds in the gramm-scale with high productivity. Under