Pyrazole, a five-membered heterocycle containing two nitrogen atoms, is extensively found
as a core framework in a huge library of heterocyclic compounds that envelops promising …

The main objective of this review is to present an assessment of green synthetic approaches
to pyrazole derivatives. It is our hope to provide beneficial, effective and up-to-date green …

Efficient synthesis of benzopyrano [4, 3-b] pyridine derivatives was achieved from 4-amino-3-
formylcoumarin and different active methylene compounds under solvent-free thermal …

For the first time sulphated silica tungstic acid (SSTA) has been synthesized and used as an
acidic catalyst in organic synthesis. The catalyst was prepared by a simple method based on …

Ethyl 5-acetyl-4-methyl-2-(phenylamino) thiophene-3-carboxylate (2) and there derivatives
3a–c, 4, 6a–c and 9a–f were synthesized. The structure of compound 2 was deduced by 1H …

Nitrogen heterocycles represent one of the most important units in modern organic chemistry
besides their wide existence broadly in natural products, pharmaceuticals, and functional …

Résumé A novel, greener approach was adopted for the synthesis of 3, 4-dihydropyrimidin-2
(1H)-one derivatives (4a–i) using bis [(L) prolinato-N, O] Zn as an inexpensive, efficient and …

Highly efficient ZnO nanoparticle catalyzed one-pot solvent-free synthesis of novel pyridine
derivatives by three-component reaction of β-enaminones, different active methylene …

Polyethylene glycol-6000 supported copper-molybdenum nanoparticles (CuO–MoO 3@
PEG) has been synthesized as a highly efficient, novel and recyclable heterogeneous …

Silica-supported perchloric acid and bisulfate (SiO2/HClO4 and SiO2/KHSO4) have been
developed as reusable green catalysts for nitration of aromatic compounds using NaNO2 in …