Dehydrative intramolecular nitrone cycloaddition in confined aqueous media: a green chemical route to cis-fused chromano[4,3-c]isoxazoles

One-pot facile and mild construction of densely functionalized pyrimidines in water via consecutive C-C and C-S bonds formation

Fused pyrimidines composed of alternating heteroatoms and a pyrimidine moiety were synthesized efficiently using readily available starting material 4-hydroxycoumarin, aromatic aldehydes, and urea/thiourea at room temperature. Acid, metal salts, and surfactants were screened for their influence on catalytic activity in three-component reactions and sodium lauryl sulphate (SLS) was used as the best catalyst with different concentrations. Screening results of catalyst loading from our investigation showed that good to excellent yields were obtained with 10 mol%. Our method efficiently synthesized heterocycles and avoided the use of hazardous solvents and conventional organic solvents. Our procedure which involves a surfactant is operationally simple, environmentally benign, has excellent yields, short reaction times, and synthetically is as efficient as conventional procedures using organic solvents.

Role of surfactant and micelle promoted mild, green, highly efficient and sustainable approach for construction of novel fused pyrimidines at room temperature in water

A facile, efficient and green protocol for surfactant catalyzed synthesis of fused pyrimidines in water at room temperature was developed for the first time.

Copper catalyzed oxidative deamination of Betti bases: an efficient approach for benzoylation/formylation of naphthols and phenols

A copper-catalyzed benzoylation/formylation of naphthols and phenols via oxidative deamination of Betti bases.

G, Malik A, Kumar V, Chatterjee A, Roy BG, Banerjee M. In situ mechanochemical synthesis of nitrones followed by 1,3-dipolar cycloaddition: a catalyst-free, “green” route to cis-fused chromano[4,3-c]isoxazoles

An efficient, catalyst free mechanochemical route to cis-fused chromano[4,3-c]isoxazoles has been developed via a simple mortar-pestle grinding method.

Yonemitsu-type condensations catalysed by proline and Eu(OTf)3

The reaction of aromatic heterocycles, aldehydes, and active methylene compounds affords polyfunctionalised heterocycles. The reaction is green and provides access to compounds that cannot be obtained by classical methodology.