diketones and alkenes under cobalt(II) catalysis and dimethyl sulfoxide involvement. Under optimal conditions, the formation of five- and six-membered rings can be readily controlled by the α-position substitution of styrenes. This process is proposed to proceed through a reaction sequence of oxidative coupling (mediated by K2S2O8), regioselective alkene insertion (promoted by cobalt), and intramolecular
通过在钴 (II) 催化和二甲亚砜参与下偶联二酮和烯烃,实现了一种合成环戊烯和环己烯的独特方法。在最佳条件下,五元环和六元环的形成可以很容易地通过苯乙烯的α位取代来控制。建议该过程通过氧化偶联(由 K 2 S 2 O 8介导)、区域选择性烯烃插入(由钴促进)和所得烯丙基钴物质对羰基或甲基进行分子内攻击的反应序列进行。反应亚甲基工艺。
Enantio- and diastereoselective asymmetric allylic alkylation catalyzed by a planar-chiral cyclopentadienyl ruthenium complex
We report asymmetricallylicalkylation of allylic chloride with [small beta]-diketones as the prochiral carbon nucleophile using a planar-chiral Cp´Ru catalyst. The reaction proceeds under mild conditions; the resulting chiral products...
Ruthenium(<scp>ii</scp>)-catalysed direct synthesis of mono-allylation products of 1,3-diketones from cinnamyl alcohols
作者:Rajesh K. Jena、Mahesh Samanta、Mohan C. Sau、Sonali Panda、Braja N. Patra、Manish Bhattacharjee
DOI:10.1039/d2nj01650h
日期:——
synthesized and structurally characterized. It crystallizes in the orthorhombic non-centrosymmetric space group P212121 and undergoes auto-resolution. The complex is an efficient catalyst for direct carbon–carbonbond-formationreactions using cinnamyl alcohols to produce enantio- and regioselective mono-allylation products of diketones in high yield. A wide range of substrates provides good to excellent
合成了复合物[Ru( p -cymene)(dppe)Cl]PF 6 ·C 7 H 8并进行了结构表征。它在正交非中心对称空间群P 2 1 2 1 2 1中结晶并经历自动分辨。该配合物是一种有效的催化剂,用于直接碳-碳键形成反应,使用肉桂醇以高收率生产二酮的对映选择性和区域选择性单烯丙基化产物。广泛的基材提供了良好的产量。吡咯烷和乙酸添加剂的使用增加了选择性并防止了不需要的副产物。
Cobalt(III)-Catalyzed and DMSO-Involved Allylation of 1,3-Dicarbonyl Compounds with Alkenes
Cobalt(III)-catalyzed allylation of 1,3-dicarbonylcompounds has been reported with in situ generated allyl reagents from alkenes and dimethyl sulfoxide (DMSO). This novel protocol enables a high regio- and stereoselective access for a broad range of allyl 1,3-dicarbonylcompounds. In the transformation, DMSO plays the role of a C1 source, and it incorporates with alkenes to form the allyl reagent