Electrosynthesis of Trisubstituted 2-Oxazolines via Dehydrogenative Cyclization of β-Amino Arylketones
摘要:
An electrochemically intramolecular functionalization of C-(sp(3))-H bonds with masked oxygen nucleophiles was developed. With IU as the catalyst and electrolyte, diverse trisubstituted 2-oxazolines were constructed in good to excellent yields. This newly developed electrochemical dehydrogenalive approach features external oxidant-free and additive-free conditions.
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.
SBA-15-Pr–SO3H: An efficient, environment friendly and recyclable heterogeneous nanoreactor catalyst for the one-pot multicomponent synthesis of β-acetamido ketones
作者:KIUMARS BAHRAMI、MOHAMMAD M KHODAEI、PEYMAN FATTAHPOUR
DOI:10.1007/s12039-014-0762-1
日期:2015.1
multi-component condensation of aromatic aldehydes, ketones and acetonitrile in the presence of acetyl chloride at 80°C to afford β-acetamido ketones in excellent yields. The catalyst can be recovered and recycled for subsequent reactions without any appreciable loss of efficiency. SBA-15-Pr–SO3H as nanoreactor catalyzes the multicomponent condensation of aromatic aldehydes, ketones, and acetonitrile
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.