Heteropoly acids as solid green Brønsted acids for a one-pot synthesis of β-acetamido ketones by Dakin–West reaction

Phosphotungstic Acid Catalysed Synthesis of β-Enamino Compounds under Solvent-Free Conditions

A convenient eco-friendly procedure has been developed for the synthesis of β-enaminones and β-enamino esters by reacting 1,3-dicarbonyl compounds with amines in the presence of catalytic amounts of phosphotungstic acid (H3PW12O40, 1 mol%). The reaction proceeds smoothly at room temperature under solvent-free conditions and gives the corresponding β-enamino compounds in high to excellent yields.

Synthesis of 3-[(acetylamino)(aryl)methyl]-4-Hydroxycoumarins

One-pot, three-component reaction between aryl aldehydes, 4-hydroxycoumarin, and acetonitrile in the presence of chlorosulfonic acid affords 3-[(acetylamino)(aryl)methyl]-4-hydroxycoumarins in excellent yields.

Ultrasound-Promoted Synthesis of 3-[(acetamido)(aryl)methyl]-4-hydroxy-6-methyl-2H-pyran-2-ones via a Three-Component Condensation

A three-component one-pot condensation of aryl aldehydes, 4-hydroxy-6-methyl-2H-pyran-2-one and acetamide catalysed by p-toluenesulfonic acid (p-TSA), under ultrasound irradiation and ambient conditions, gives 3-[(acetamido)(aryl)methyl]-4-hydroxy-6-methyl-2H-pyran-2-ones in excellent yield and in short time.

Synthesis of 3-[(acetylamino)(aryl)Methyl]-4-Hydroxy-6-Methyl-2H-Pyran-2-Ones

A one-pot, three-component reaction between aryl aldehydes, 4-hydroxy-6-methyl-2H-pyran-2-one, and acetonitrile in the presence of chlorosulfonic acid affords 3-[(acetylamino)(aryl)methyl]-4-hydroxy-6-methyl-2H-pyran-2-ones in excellent yields.

Synergic effect of nano-catalyst and continuous flow system: Dakin–West reaction catalyzed by Nafion-H@SPIONs in a microreactor

The expansion of practical processes for superferromagnetic nanocatalysts is a very attractive subject.

Synthesis of Amido Carbonyl Compounds through the Dakin–West Reaction using Lewis Acid Catalysts

The synthesis is described of β-amido carbonyl compounds with enolisable ketones and esters in the presence of aldehyde derivatives and nitrile compounds using Lewis acid catalysts.

One-pot synthesis of β-amido ketones using Brønsted acidic ionic liquid as an efficient and reusable catalyst

An efficient protocol was developed for one-pot condensation of an aldehyde, ketone, acetyl chloride, and nitriles catalyzed by a stable and reusable 1-methyl-imidazolium hydrogen sulfate ([Hmim][HSO4]) as a Brønsted acidic ionic liquid. The system tolerated a variety of functional groups affording the corresponding β-amido ketones in moderate to good yields under milder operating conditions.

One-pot preparation of β-amido ketones/esters in a three-component condensation reaction using magnesium hydrogensulfate as an effective and reusable catalyst

A one-pot, 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 to excellent yields.Key words: multi-component reaction, magnesium hydrogensulfate, heterogeneous catalyst, β-amido ketone/ester, mild conditions.