High stereoselectivity in chelation-controlled intermolecular Heck reactions with aryl chlorides, vinyl chlorides and vinyl triflates
作者:Gopal K. Datta、Mats Larhed
DOI:10.1039/b719131f
日期:——
chelation-controlled Pd(0)-catalyzed beta-arylations and beta-vinylations of a five-membered chiral, pyrrolidine-based vinyl ether were achieved using aryl- and vinylchlorides as substrates, yielding quaternary 2-aryl/vinyl-2-methyl cyclopentanones in 89-96% ee under neutral reaction conditions.
Simple Method for the Preparation of Dimethyl Acetals from Ketones with Montmorillonite K 10 and p‐Toluenesulfonic Acid
作者:Horacio Mansilla、David Regás
DOI:10.1080/00397910600639315
日期:2006.6
Abstract A simple method for conversion of ketones to their corresponding dimethyl acetals using montmorillonite K 10 and p‐toluenesulfonic acid as acidic cocatalysts under very mild reaction conditions is described.
摘要描述了一种在非常温和的反应条件下使用蒙脱石 K 10 和对甲苯磺酸作为酸性助催化剂将酮转化为其相应二甲基缩醛的简单方法。
Synthesis of Functionalized Aliphatic Acid Esters via the Generation of Alkyl Radicals from Silylperoxyacetals
method to access functionalized aliphatic acidesters using silylperoxyacetals as alkyl radical precursors with a terminal ester moiety is described. The reaction proceeds via the in situ generation and subsequent functionalization of alkyl radicals, affording synthetically valuable aliphatic acid derivatives. A novel strategy for the synthesis of hydroxy acid derivatives via a C−O bond formation process
描述了使用甲硅烷基过氧缩醛作为具有末端酯部分的烷基自由基前体获得官能化脂肪酸酯的催化方法。该反应通过烷基自由基的原位生成和随后的官能化进行,得到具有合成价值的脂肪酸衍生物。还开发了一种通过 CO 键形成过程合成羟基酸衍生物的新策略。
A mild route to solid-supported rhodium nanoparticle catalysts and their application to the selective hydrogenation reaction of substituted arenes
3% (w/w) supported rhodiumnanoparticle (3.0 ± 0.7 nm) catalysts onto commercial ion-exchange resins. Their application to the liquid-phase hydrogenation reaction of CC bonds shows the most active species are obtained under catalytic conditions at room temperature and 1 bar H2. The heterogeneous catalyst shows excellent activity, selectivity and reusability in the hydrogenation reaction of alkenes
描述了在工业离子交换树脂上制备1.3%(w / w)负载的铑纳米颗粒(3.0±0.7 nm)催化剂的干净方法。它们在C C键的液相加氢反应中的应用表明,在室温和1 bar H 2的催化条件下获得的活性最高。在非常不需要的条件下,非均相催化剂在烯烃和取代的芳烃的氢化反应中显示出优异的活性,选择性和可重复使用性。就载体对催化效率的影响讨论了结果。
High-Pressure-Promoted Uncatalyzed Ketalization of Ketones and Oxy-Michael/Ketalization of Conjugated Enones
A new practical method for ketalization or oxy-Michael/ ketalization was developed using the high-pressure-promoted condensation of ketones or α,β-unsaturated ketones with alcohols in the presence of trialkyl orthoformates as water scavengers.