1. INTRODUCTION Indoline-2, 3-dione or indole-1H-2, 3-dione (Figure 1), commonly known
as isatin, is a well-known natural product found in plants of genus Isatis and in Couropita …

Due to biological and medicinal properties of pyranopyrazoles, synthesis of these bioactive
heterocycles has attracted the interest of medicinal and organic chemists. This review …

A facile one-pot multicomponent protocol for the synthesis of bio-active pyrano [2, 3-c]
pyrazole and benzylpyrazolyl coumarin derivatives has been demonstrated using ZrO2 …

Meglumine, a bio-based chemical, was demonstrated to be a highly efficient and reusable
catalyst for the synthesis of a series of pyranopyrazole derivatives via a one-pot, four …

An efficient one-pot synthesis of spiro [indoline-3, 4′-pyrano [2, 3-c] pyrazole] derivatives by
four-component reaction of hydrazine, β-keto ester, isatin, and malononitrile or ethyl …

Supramolecular β-cyclodextrin (β-CD) as a highly efficient, biodegradable, and reusable
catalyst for the synthesis of pyranopyrazole derivatives is investigated via a one-pot four …

We describe a one-pot four component synthesis of pyranopyroles from aryl aldehydes,
ethyl acetoacetate, malononitrile and hydrazine hydrate in the presence of catalytic amounts …

Today, due to the develo** need for inexpensive catalysts, recyclable magnetic
nanocatalysts immobilized on polysaccharides possess many advantages over classical …

Amberlyst A21 was found to be an extremely efficient catalyst for synthesis of a series of 6-
amino-4-alkyl/aryl-3-methyl-2, 4-dihydropyrano [2, 3-c] pyrazole-carbonitriles by a four …

A facile and convenient procedure for the synthesis of 4 H-pyrans from aldehydes,
malononitrile, and ethyl acetoacetate/acetylacetone and also synthesis of 4 H-pyrano [2, 3-c] …