Strong Lewis acid air-stable cationic titanocene perfluoroalkyl(aryl)sulfonate complexes as highly efficient and recyclable catalysts for C–C bond forming reactions
A series of titanocene perfluoroalkyl(aryl)sulfonate complexes were synthesized, characterized, and applied in various C–C bond forming reactions.
一系列的钛ocene基过氟烷基(芳基)磺酸盐配合物被合成、表征,并应用于各种C-C键形成反应。
An environmentally friendly procedure for Mukaiyama aldol and Mukaiyama–Michael reactions using a catalytic amount of DBU under solvent- and metal-free conditions
作者:Zhi-Liang Shen、Shun-Jun Ji、Teck-Peng Loh
DOI:10.1016/j.tetlet.2004.11.099
日期:2005.1
Mukaiyama aldol and Mukaiyama–Michael reactions can proceed smoothly in the presence of a catalytic amount of DBU (20% mmol), to afford the corresponding products in moderate to good yields. This solvent- and metal-free approach provides an environmentallyfriendly procedure for Mukaiyama reactions.
Spontaneous aldol and Michael additions of simple enoxytrimethylsilanes in DMSO
作者:Yves Génisson、Liliane Gorrichon
DOI:10.1016/s0040-4039(00)00725-5
日期:2000.6
Activation of simple trimethylsilyl ketene acetals by dipolar aprotic solvents has been evidenced, allowing efficient solvent assisted aldol and Michaeladditions under extremely simple, mild and metal free conditions.
Catalysis of Mukaiyama Aldol Reactions by a Tricyclic Aluminum Alkoxide Lewis Acid
作者:Steven M. Raders、John G. Verkade
DOI:10.1021/jo9009134
日期:2009.8.7
The Mukayiama aldolreaction of aldehydes is efficiently accomplished with a low concentration of the dimeric alumatrane catalyst 2 at mild or subambient temperatures. Our protocol tolerates a wide variety of electron-rich, neutral, and deficient aryl, alkyl, and heterocyclic aldehydes. A wide variety of enol silyl ethers are also tolerated. An intermediate that was isolated provides mechanistic information
reagent(s) are distributed in both organic and fluorous phases to facilitate smooth reactions. Upon dilution with toluene after the reaction, the catalyst concentrates to the fluorous phase, while the organic substances migrate to the organic phase to effect facile catalyst recovery and recycling. By virtue of such a unique solvophilicity, a new version of fluorous biphase technology has been developed.