Ruthenium-Catalyzed Alkylation of Oxindole with Alcohols
作者:Thomas Jensen、Robert Madsen
DOI:10.1021/jo900341w
日期:2009.5.15
An atom-economical and solvent-free catalytic procedure for the mono-3-alkylation of oxindole with alcohols is described. The reaction is mediated by the in situ generated catalyst from RuCl3·xH2O and PPh3 in the presence of sodium hydroxide. The reactions proceed in good to excellent yields with a wide range of aromatic, heteroaromatic, and aliphatic alcohols.
描述了用于羟吲哚与醇的单-3-烷基化的原子经济且无溶剂的催化方法。该反应由RuCl 3 · x H 2 O和PPh 3在氢氧化钠存在下原位生成的催化剂介导。使用多种芳族,杂芳族和脂族醇,反应可以以良好的收率进行,收率很高。
Magnesium-Catalyzed Electrophilic Trifluoromethylation: Facile Access to All-Carbon Quaternary Centers in Oxindoles
作者:Dmitry Katayev、Harutake Kajita、Antonio Togni
DOI:10.1002/chem.201700851
日期:2017.6.22
The first example of a magnesium-catalyzed direct trifluoromethylation of 3-substituted oxindoles using an electrophilichypervalentiodinereagent is reported. The reaction proceeds under unprecedented mild conditions leading to the formation of an all-carbon quaternary center in oxindoles in high chemical yield and demonstrates excellent functional group tolerance. In addition to trifluoromethyl
Regioselective Palladium(II)-Catalyzed Synthesis of Five- or Seven-Membered Ring Lactones and Five-, Six- or Seven-Membered Ring Lactams by Cyclocarbonylation Methodology
作者:Bassam El Ali、Kazumi Okuro、Giuseppe Vasapollo、Howard Alper
DOI:10.1021/ja953403l
日期:1996.1.1
affording five- or seven-memberedring lactones (bicyclic, tricyclic, and pentacyclic) as the principal products, often in excellent yields. Use of 2-aminostyrenes as reactants and catalytic quantities of palladium acetate and tricyclohexylphosphine, affords five-membered ring lactams in high yield and selectivity. Bicyclic and tricyclic heterocycles containing six-membered ring lactams can be synthesized
Iron‐Catalyzed Borrowing Hydrogen
<i>C</i>
‐Alkylation of Oxindoles with Alcohols
作者:Mubarak B. Dambatta、Kurt Polidano、Alexander D. Northey、Jonathan M. J. Williams、Louis C. Morrill
DOI:10.1002/cssc.201900799
日期:——
general and efficient iron‐catalyzed C‐alkylation of oxindoles has been developed. This borrowing hydrogen approach employing a (cyclopentadienone)iron carbonyl complex (2 mol %) exhibited a broad reaction scope, allowing benzylic and simple primary and secondary aliphatic alcohols to be employed as alkylating agents. A variety of oxindoles underwent selective mono‐C3‐alkylation in good‐to‐excellent
The umpolung alkylation of silyl enol ethers with an iodonium(III) ylide proceeds under mild conditions to afford various 1,4-dicarbonyl compounds in high yields in the presence of a halogen-bonding catalyst. Unlike typical transition-metal activation processes of such ylideprecursors, which tend to proceed via carbenoid intermediates, experimental and computational studies indicate that halogen bonding