A highly efficient three-component coupling of aldehyde, terminal alkyne, and amine via C–H activation catalyzed by reusable immobilized copper in organic–inorganic hybrid materials under solvent-free reaction conditions
作者:Pinhua Li、Lei Wang
DOI:10.1016/j.tet.2007.04.032
日期:2007.6
Recycling copper(I) immobilized on organic–inorganic hybrid material behaves as a very efficient heterogeneous catalyst in the three-component Mannich coupling reaction of aldehydes, terminalalkynes, and amines via C–H activation to afford the corresponding products in good to excellent yields under solvent-free reaction conditions.
A Microwave-Enhanced, Solventless Mannich Condensation on CuI-Doped Alumina
作者:G. W. Kabalka、L. Wang、R. M. Pagni
DOI:10.1055/s-2001-13376
日期:——
Terminal alkynes react with secondary amines and para-formaldehyde to afford Mannich adducts in the presence of cuprous iodide on alumina under microwave irradiation and solvent free conditions.
Highly efficient three-component (aldehyde–alkyne–amine) coupling reactions catalyzed by a reusable PS-supported NHC–Ag(I) under solvent-free reaction conditions
作者:Pinhua Li、Lei Wang、Yicheng Zhang、Min Wang
DOI:10.1016/j.tetlet.2008.09.026
日期:2008.11
The development of a highly efficient, polystyrene-supported NHC–Ag(I) catalyst for the three-component coupling reactions of aldehydes, alkynes, and amines (A3-coupling) was described. In the presence of PS–NHC–Ag(I) (2 mol %), the A3-reactions were carried out at room temperature under solvent-free reactionconditions and the corresponding propargylamines were generated in good to excellent yields
A solventless Mannichcondensation of aldehydes, amines, and terminal alkynes catalysed by 10 mol% of CuCl2 was investigated. The components were simply mixed and heated together under vacuum, without any need of solidsupport or solvent. This results in the formation of Mannichproducts in high yields.
A microwave-enhanced, solventless Mannich condensation of terminal alkynes and secondary amines with para-formaldehyde on cuprous iodide doped alumina
作者:George W. Kabalka、Li-Li Zhou、Lei Wang、Richard M. Pagni
DOI:10.1016/j.tet.2005.10.049
日期:2006.1
A microwave-enhanced, solventless Mannich condensation of terminal alkynes and secondary amines with para-formaidehyde on cuprous iodide doped alumina has been developed. beta-Aminoalkynes are generated in good yields. The reaction can be extended to include a cyclization, which affords 2-substituted benzo[b]furans. The chemoselectivity of the reaction indicates that terminal alkynes are much more reactive than enolizable ketones under the reaction conditions. (c) 2005 Elsevier Ltd. All rights reserved.