Dysprosium Incorporated Into Balsalazide Trapped Between the Functionalized Halloysite and g-C3N4 as an Efficient and Heterogeneous Catalyst for the Synthesis of Chromene Derivatives

Abstract

An efficient and heterogeneous novel Dy complex of balsalazide, trapped between the functionalized halloysite and g-C3N4, was successfully synthesized by post-synthetic modification approach (Dy@Hal-BS-g-C3N4). It was characterized by several advanced analytical methods including, FT-IR, SEM, EDX, elemental mapping, XRD, ICP-OES and TGA. The as-synthesized material was catalytically explored as a novel recoverable nanocatalyst in the synthesis of an array of biologically active pyran derivatives, i.e., the 2-amino-5,10-dioxo-4-aryl-5,10-dihydro-4H-benzo[g]chromene-3-carbonitriles. Excellent yields of the desired products and facile reusability of the catalyst are the two advantageous factors in the introduction of this novel catalytic system.

Chlorosulfonic acid coated on porous organic polymer as a bifunctional catalyst for the one-pot three-component synthesis of 1,8-naphthyridines

“… 34 It makes the process benign by curtailing the amount of solvent, cost and energy during the reaction. 35 Among various discovered and synthesized heterocyclic systems, the fused nitrogen-containing heterocycles are ubiquitous. 1,8-Naphthyridines is one of the privileged pharmaceutical and pharmacologically active ingredients that has received considerable interest from both synthetic and industrial perspectives.…”

Hercynite silica sulfuric acid: a novel inorganic sulfurous solid acid catalyst for one-pot cascade organic transformations

“…Multi-component reactions (MCRs) can be regarded as a constructive approach to synthesizing heterocyclic compounds with diverse structures. 35–40 In MCRs, the named reactions readily occur in sequence and are often combined. 41 In this sense, the catalytic synthesis including the aldol condensation–Michael addition sequence has been of major interest to researchers in the area of synthetic and methodology chemistry as an important synthetic tool, owing to its ability to synthesize diverse types of heterocyclic compounds using different carbonyl moieties, active hydrogen compounds, and Michael donor agents, which will lead to a lot of structural diversity in the final heterocyclic products.…”