Simple Method for sp2–sp3 and sp3–sp3 Carbon–Carbon Bond Activation in 2-Substituted 1,3-Diketones
摘要:
Simple and efficient methods were developed for sp(2)-sp(3) and sp(3)-sp(3) C-C bond-activation reactions of 2-substituted 1,3-diketones. 3-Substituted 3-bromopentane-2,4-diones were deacylated in the presence of an aromatic compound and a silica gel supported Bronsted acid containing sulfonic groups. The carbocation formed by cleavage of the sp(3)-sp(3) C-C bond of the dione alkylated the aromatic compound.
A simple and efficient FeCl3-catalyzed direct alkylation of active methylene compounds with benzylic and allylic alcohols under mild conditions
作者:Umasish Jana、Srijit Biswas、Sukhendu Maiti
DOI:10.1016/j.tetlet.2007.04.017
日期:2007.6
A highlyefficient FeCl3-catalyzed alkylation of various active methylene compounds with various benzylic or allylic alcohols under mild conditions has been developed. The reaction was carried out in the presence of a catalytic amount of anhydrous FeCl3 (10 mol %) under reflux in methylene chloride. High to excellent yields were obtained.
Intra- and Intermolecular Alkylation of <i>N</i>,<i>O</i>-Acetals and π-Activated Alcohols Catalyzed by in Situ Generated Acid
作者:Mélanie Hamon、Niall Dickinson、Alice Devineau、David Bolien、Marie-José Tranchant、Catherine Taillier、Ivan Jabin、David C. Harrowven、Richard J. Whitby、A. Ganesan、Vincent Dalla
DOI:10.1021/jo4015886
日期:2014.3.7
allow significant reaction rate enhancements and made possible some challenging reactions such as the α-amidoalkylation of ketones. Studies using flow chemistry confirmed not only that very low concentrations of HCl generated from the solvent were responsible for the reactivity but also that TCE had additional beneficial properties in comparison to other chlorinated solvents such as dichloroethane.
A simple and efficient procedure for carbon-carbon bond formation has been developed starting from alcohols and active methylene-containing compounds usingsilica gel supportedsodiumhydrogen sulfate (NaHSO4/SiO2) under mild conditions. NaHSO4/SiO2 can be reused without loss of catalytic activity at least ten times. carbon-carbon coupling - silica gel - alcohol - supported catalysts
Efficient Nucleophilic Substitution of α-Aryl Alcohols with 1,3-Dicarbonyl Compounds Catalyzed by Tin Ion-Exchanged Montmorillonite
作者:Makoto Onaka、Jiacheng Wang、Yoichi Masui
DOI:10.1055/s-0030-1258567
日期:2010.10
Tin ion-exchanged montmorillonite demonstrated the high catalytic activity for the direct nucleophilic substitution of a hydroxyl group in α-aryl alcohols with various 1,3-dicarbonyl compounds including less acidic 1,3-diesters in crude solvents to afford the benzylated products accompanied by water.
HY and Hβ Zeolites Mediated C–C Bond Formation via Addition/Substitution Reaction of 1,3-Dicarbonyl Compounds to Alcohols and Alkenes
作者:Murali Boosa、Divya Rohini Yennamaneni、Durgaiah Chevella、Vasu Amrutham、Krishna Sai Gajula、Ramulamma Madasu、Venugopal Akula、Narender Nama
DOI:10.1007/s10562-022-04062-8
日期:——
We investigated direct additionreaction of β-diketone with several alcohols and alkenes employing solid acid zeolites (HY & Hβ). The presence of acidic sites and the porous structures exhibits and influences the catalytic activity. These heterogeneous catalysts were used directly for the nucleophilic addition/substitution reactions. HY zeolite was utilized for the reaction of various aromatic alcohols