In the presence of a catalytic amount of samariumdiiodide in methylene chloride, aromatic imines react with Danishefsky diene to form tetrahydropyridine-4-ones in high yields. Under the same conditions, various imino-aldol reactions afford β-amino esters or β-amino ketones.
An efficient and mild bismuth triflate-catalysed three-component Mannich-type reaction
作者:Thierry Ollevier、Etienne Nadeau
DOI:10.1039/b710794c
日期:——
In the presence of a catalytic amount of Bi(OTf)(3).4H(2)O, aldehydes together with amines react with silylenolates to afford the corresponding Mannich-type adducts smoothly. A wide variety of silylenolates derived from ketones, as well as esters and thioesters, react rapidly to afford the beta-amino ketones or the beta-amino esters in high yields (up to 94%).
Solvent-free Imino-Aldol Three-component Couplings on a Conveniently-prepared and Reusable Phosphoric Acid-Silica Gel Support
作者:Sandra Lock、Norikazu Miyoshi、Makoto Wada
DOI:10.1246/cl.2004.1308
日期:2004.10
solvent-free procedure for the synthesis of β-amino carbonyl compounds in generally moderate to excellent yields has been developed. Three-component Mannich-type couplings between aldehydes (aromatic, aliphatic, alicyclic, and heterocyclic), aromatic amines and silyl enol equivalents proceeded smoothly on a conveniently prepared and reusable phosphoric acid-silica gel solid support.
Synthesis of Novel Dendritic 2,2‘-Bipyridine Ligands and Their Application to Lewis Acid-Catalyzed Diels−Alder and Three-Component Condensation Reactions
作者:Takahito Muraki、Ken-ichi Fujita、Masato Kujime
DOI:10.1021/jo070767a
日期:2007.10.1
dendritic Cu(OTf)2 catalysts were used for Diels−Alder and three-component condensationreactions. The dendritic Cu(OTf)2-catalyzed Diels−Alder reaction proceeded smoothly, and these dendritic catalysts could be recycled without deactivation by reprecipitation. Three-component condensationreactions such as Mannich-type reactions also proceeded not only in dichloromethane but also in water. Furthermore
Organic Synthesis Inside Particles in Water: Lewis Acid−Surfactant-Combined Catalysts for Organic Reactions in Water Using Colloidal Dispersions as Reaction Media
A Lewisacid−surfactant-combinedcatalyst (LASC) has been developed and applied to Lewis acid-catalyzed organic reactions in water. LASCs are composed of water-stable Lewis acidic cations such as scandium and anionic surfactants such as dodecyl sulfate and dodecanesulfonate and are easily prepared. These catalysts have been successfully used for various typical carbon−carbon bond-forming reactions