IMMOBILIZED CATALYST DIRECTED TO SYNTHETIC CONTROL. CROSS-ALDOL REACTION
作者:Teruaki Mukaiyama、Hiroshi Iwakiri
DOI:10.1246/cl.1985.1363
日期:1985.9.5
Cross-aldol adducts are stereoselectively formed in good yields by treating acetals or aldehydes and silyl enol ethers in a heterogeneous system with a catalytic amount of polymer-supported trityl perchlorate.
A new synthetic procedure for the practical synthesis of β-trimethylsiloxyketones from silyl enol ethers and aldehydes has been described which heavily depends on organoaluminum reagent as an effective catalyst.
New Application of Solid Acid to Carbon–Carbon Bond Formation Reactions: Clay Montmorillonite-Catalyzed Aldol Reactions of Silyl Enol Ethers with Aldehydes and Acetals
作者:Motomitsu Kawai、Makoto Onaka、Yusuke Izumi
DOI:10.1246/bcsj.61.1237
日期:1988.4
A new attempt of utilizing solid acid to the cross aldol reaction of silylenolethers with aldehydes or acetals has been investigated. Among solid acids employed, the reaction is promoted most effectively by a catalytic amount of aluminium ion-exchanged montmorillonite (Al-Mont). Simple diastereoselection is significantly sensitive to the nature of the reaction solvent used in the Al-Mont-catalyzed
作者:Roger G. Kelleher、M. Anthony McKervey、Pongsak Vibuljan
DOI:10.1039/c39800000486
日期:——
Anhydrous lithium iodide in ether, tetrahydrofuran, or benzene is an effective reagent for the formation of αβ-unsaturated ketones by condensation of alkyl ketones with enolisable and non-enolisable aldehydes; in the presence of trimethylchlorosilane–triethylamine enone formation is suppressed and high yields of 1,3-hydroxy-ketones are obtained as their trimethylsilyl ether derivatives.
Clay Montmorillonite-Catalyzed Aldol Reactions of Silyl Enol Ethers with Aldehydes and Acetals
作者:Motomitsu Kawai、Makoto Onaka、Yusuke Izumi
DOI:10.1246/cl.1986.1581
日期:1986.9.5
By the use of clay montmorillonite as a catalyst, cross aldol adducts are obtained from silyl enol ethers and aldehydes or acetals. The diastereoselectivity in the reaction is significantly sensitive to the solvent used.