Solvent-free heterogeneous organocatalysis: stereoselective isomerization of α,β-ynones to (E,E)-α,β-γ,δ-dienones catalyzed by polymer-supported tertiaryphosphines
摘要:
Stereoselective isomerization of alpha, beta-ynones was catalyzed by polymer-supported tertiaryphosphines under solvent-free conditions. (E, E)-alpha, beta-gamma, delta-Dienones were obtained with up to 93% isolated yields when JJ-TPP was employed. (c) 2007 Elsevier Ltd. All rights reserved.
Carbonylative Sonogashira Coupling of Terminal Alkynes with Aqueous Ammonia
作者:Mohamed S. Mohamed Ahmed、Atsunori Mori
DOI:10.1021/ol035007a
日期:2003.8.1
graphicCarbonylative coupling of phenylethyne with 4-methoxy-1-iodobenzene in the presence of 1 mol % PdCl2(PPh3)2, 2 equiv of 0.5 M aqueous ammonia, and CO (1 atm) gives the corresponding alpha,beta-alkynyl ketone in 72% isolated yield after stirring at room temperature for 41 h, while noncarbonylative coupling product is not obtained.
Aqueous Ammonia as a New Activator for Sonogashira Coupling
作者:Mohamed S. Mohamed Ahmed、Akitoshi Sekiguchi、Kentaro Masui、Atsunori Mori
DOI:10.1246/bcsj.78.160
日期:2005.1
Sonogashira coupling, which is a coupling reaction of terminal alkynes with organic halides, takes place with dilute aqueous ammonia as an activator. The reaction of several terminal alkynes and aryl iodides in the presence of small excess of aqueous ammonia at room temperature furnishes the cross-coupling product in good-to-excellent yields. A water-soluble amine with a high boiling point is alternatively employed for reactions at higher temperatures. A related coupling reaction in the presence of carbon monoxide also proceeded at room temperature and under ambient pressure to afford α,β-alkynyl ketones efficiently.
Solvent-free heterogeneous organocatalysis: stereoselective isomerization of α,β-ynones to (E,E)-α,β-γ,δ-dienones catalyzed by polymer-supported tertiaryphosphines
Stereoselective isomerization of alpha, beta-ynones was catalyzed by polymer-supported tertiaryphosphines under solvent-free conditions. (E, E)-alpha, beta-gamma, delta-Dienones were obtained with up to 93% isolated yields when JJ-TPP was employed. (c) 2007 Elsevier Ltd. All rights reserved.