A modified procedure for the Dakin–West reaction: an efficient and convenient method for a one-pot synthesis of β-acetamido ketones using silica sulfuric acid as catalyst

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.

Silica Sulfuric Acid as a Reusable Catalyst for the Conversion of Ketones into Amides by a Schmidt Reaction under Solvent-Free Conditions

Silica sulfuric acid is a highly efficient reagent for the conversion of a variety of ketones into the corresponding amides by a Schmidt reaction under solvent-free conditions. Cyclic, aliphatic and aromatic ketones with electron-donating or withdrawing substituents may be converted easily in excellent yield. The major advantages of this method are: operational simplicity, the ready availability of the reagent, selectivity, general applicability, mild reaction conditions, short reaction times and high yields. The recovered catalyst could be used in new attempts without any purification.

Functionalization of 3-chloroformylcoumarin to coumarin Schiff bases using reusable catalyst: an approach to molecular docking and biological studies

Recently, heterogeneous catalysts have been explored eximiously in the synthesis of heterocyclic compounds. Therefore, here we used solid-supported heterogeneous silica sulfuric acid as a catalyst for the synthesis of Schiff's base of 3-chloroformylcoumarin in view of simplified procedure, reusability and acceptable efficiency, which are required in organic synthesis. An efficient and facile methodology is preferred for synthesis of a class of chromeno-3-substituted derivatives (1a-1l) with good yields. The molecular docking results showed excellent binding interactions with the Mycobacterium tuberculosis InhA-D148G mutant (PDB: 4DQU). The same biomolecules were screened for their in vitro anti-tubercular activity against the M.tb H37Rv strain and antimicrobial studies. Physico-chemistry, toxicity prediction with IC50 value and bioactivity score were also calculated for title compounds. Most active compounds were further tested for cytotoxicity studies and exhibited low-level cytotoxicity against Vero cells. The suggested conjugates are promising lead compounds for the subsequent investigation in search of new anti-tubercular agents. All the conjugates were obtained within the range and followed the Lipinski rule of 5, indicating more 'drug-like' nature.

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.

Sulfonated carbon/nano-metal oxide composites: a novel and recyclable solid acid catalyst for organic synthesis in benign reaction media

A novel catalytic system based on the use of nano-metal oxides and carbon has been designed and exhibits excellent catalytic activity for acid catalyzed organic reactions.

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.

Silica sulfuric acid: a reusable solid catalyst for one pot synthesis of densely substituted pyrrole-fused isocoumarins under solvent-free conditions

A convenient and efficient methodology for the synthesis of densely substituted pyrrole-fused isocoumarins, which employs solid-supported silica sulfuric acid (SSA) as catalyst, has been developed. When the mixture of ninhydrin adducts of acetylacetone/ethyl acetoacetate and primary amines was heated on the solid surface of SSA under solvent-free conditions, the pyrrole-fused isocoumarins were formed in good yields. This synthetic method has several advantages such as the employment of solvent-free reaction conditions without the use of any toxic reagents and metal catalysts, the ease of product isolation, the use of a recyclable catalyst, the low cost, the easy availability of the starting materials, and the excellent yields of products.

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.