VB1–Al2O3-catalyzed one-pot condensation of aromatic ketone, aromatic aldehyde, and amide
作者:Min Lei、Lei Ma、Lihong Hu
DOI:10.1016/j.tetlet.2010.07.008
日期:2010.9
A novel and green approach for the efficient synthesis of β-amido ketones using VB1–Al2O3 as a heterogeneous catalyst for the first time from an aldehyde, enolizable ketones, and an amide in EtOH is described. The present methodology has several advantages from the economical and environmental points of view, such as simple procedure, low catalyst loading, high atom economy, and good yields.
描述了一种新颖且绿色的方法,首次使用VB 1 -Al 2 O 3作为多相催化剂从乙醛,可烯化的酮和酰胺在EtOH中有效合成β-酰胺基酮。从经济和环境的观点来看,本方法具有若干优点,例如操作简单,催化剂用量低,原子经济性高和产率高。
Synthesis of Mannich type products via a three-component coupling reaction
作者:Ghanshyam Pandey、Ravi P. Singh、Ashish Garg、Vinod K. Singh
DOI:10.1016/j.tetlet.2005.01.118
日期:2005.3
The reactions of alkyl nitriles, acetyl chloride, aldehydes and β-ketoesters or simple ketones was studied for the one-potsynthesis of β-acetamido carbonylcompounds. It was observed that the reaction proceeds in the absence of Lewis acids. However, a Lewis acid catalyzes the reaction and several were tested. It was found that whereas Cu(OTf)2 is suitable for the coupling of β-ketoesters with aldehydes
One-pot preparation of β-amido ketones/esters in a three-component condensation reaction using magnesium hydrogensulfate as an effective and reusable catalyst
three-component condensation of an aryl aldehyde, an enolizable ketone or β-keto ester, acetyl chloride, and acetonitrile or benzonitrile in the presence of magnesium hydrogensulfate as an active, recoverable, and reusable green catalyst is described for the synthesis of β-amido ketones/esters at room temperature. The key features of this methodology are simplicity, mild reaction conditions, and high
Aromatic aldehydes react in one pot at room temperature with enolizable ketones and acetonitrile in the presence of acetyl chloride and catalytic amount of BiOCl producing the corresponding β-acetamido ketones in very high to excellent yields. BiCl3 generated in situ from BiOCl and acetyl chloride catalyzes the multicomponent reaction.
Facile and diastereoselective synthesis of β-acetamido ketones and keto esters via direct Mannich-type reaction
作者:Hui Mao、Jieping Wan、Yuanjiang Pan
DOI:10.1016/j.tet.2008.11.071
日期:2009.1
A Mannich-type three-component reaction involving aldehydes, acetamide, and enolizable ketones or β-keto esters for the preparation of β-acetamido carbonyl compounds in the presence of TMSCl is described. This newly developed protocol is operationally convenient, widely applicable, and highly diastereoselective.