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。
C-3 alkylation of oxindole with alcohols by Pt/CeO<sub>2</sub> catalyst in additive-free conditions
作者:Chandan Chaudhari、S. M. A. Hakim Siddiki、Kenichi Kon、Atsuko Tomita、Yutaka Tai、Ken-ichi Shimizu
DOI:10.1039/c3cy00911d
日期:——
In a series of transition metal-loaded CeO2 catalysts and Pt-loaded catalysts on various supports, Pt-loaded CeO2 shows the highest activity for the selectiveC-3alkylation of oxindole with octanol. The catalyst is effective for alkylation of oxindole and N-substituted oxindole with a series of substituted benzyl, linear, hetero-aryl alcohols under additive-free conditions and is recyclable. Our results
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
Organocatalytic asymmetric Michael addition between 3-subsituted oxindoles and enals catalyzed by camphor sulfonyl hydrazine
作者:Wen-Fu Cheng、Ling-Yan Chen、Fang-Fang Xu、Wei-Yu Lin、Xinfeng Ren、Ya Li
DOI:10.1039/c8ob02934b
日期:——
Organocatalyticasymmetric Michael addition between 3-substituted oxindoles and enals catalyzed by chiral camphor sulfonyl hydrazines (CaSHs) has been developed. A wide range of 3-substituted oxindoles and enals were successfully used, giving the corresponding 3,3-disubstituted oxindoles containing vicinal stereogenic carbon centers in good yields with good to excellent enantioselectivities and moderate
An efficient enantioselective alkylation of N‐unprotected 3‐substitutedoxindoles was realized by using a chiral N,N′‐dioxide/scandium(III) complex as the catalyst. A wide range of 3,3‐dialkyl substitutedoxindoles with quaternary stereocenters were obtained in high yields and ee values (up to 98% yield and 99% ee).