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.
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.
In the presence of 1-(2-pyridylethynyl)-2-(2-thienylethynyl)benzene as a ligand, the direct synthesis of alkynones has accomplished by a Pd-catalyzed coupling reaction of acid chlorides with terminal acetylenes under mild conditions.
A phosphine-free heterogeneous coupling of acyl chlorides with terminal alkynes catalyzed by an MCM-41-immobilized palladium complex
作者:Bin Huang、Lin Yin、Mingzhong Cai
DOI:10.1039/c3nj00425b
日期:——
The phosphine-free heterogeneous coupling of acyl chlorides with terminalalkynes was achieved in triethylamine at 50 °C in the presence of a 0.2 mol% 3-(2-aminoethylamino)propyl-functionalized MCM-41-immobilized palladium complex [MCM-41-2N-Pd(OAc)2], yielding a variety of ynones in good to excellent yields. This novel heterogeneous palladiumcatalyst can be conveniently prepared from commercially
Polystyrene-Supported Zinc Bromide-Ethylenediamine Complex as a Reusable and Highly Efficient Heterogeneous Catalyst for the Synthesis of α,β-Acetylenic Ketones
A polystyrene-supported zinc bromide-ethylenediamine complex was shown to be useful as a recyclable heterogeneouscatalyst for the rapid and efficient synthesis of α,β-acetylenic ketones in good-to-excellent yields by cross-coupling of acid chlorides with terminal alkynes. The catalyst is easily prepared, stable, reusable, and efficient under the reaction conditions. heterogeneous catalysis - cross-coupling
Using Pd–salen complex as an efficient catalyst for the copper- and solvent-free coupling of acyl chlorides with terminal alkynes under aerobic conditions
palladium(II) N,N′-bis[5-(triphenylphosphonium)-methyl]salicylidene}-1,2-ethanediamine chloride was found to be a highly active catalyst for the copper- and solvent-free coupling reaction of terminalalkynes with different acylchlorides in the presence of triethylamine as base, giving excellent ynonesunderaerobicconditions.