Synthesis of Novel Azo Fused Dipyrazolopyridine Derivatives using Waste Orange Peel Derived C-SO3H Nano-Powder as an Efficient and Reusable Catalyst

SO3H‐Functionalized Carbon Materials: A Versatile and sustainable heterogeneous Catalyst for Diverse Organic Transformations

“…Pyrazolopyridines are promising class of heterocycles which exhibit diverse activities and found in anxiolytic drugs such as tracazolate, cartazolate, and etazolate [103][104] Lalitha et al [105 ] have synthesized azo-fused dipyrazolopyridines 75 by one-pot pseudo-six-component reaction of various substituted aryl azosalicylaldehydes 4, ethyl acetoacetate 14, hydrazine hydrate 73, and ammonium acetate 6 using mild acid catalyst carbon modified sulfonic acid (C-SO 3 H) derived from waste orange peel (Scheme 45).…”

Synthesis and Biological Studies of 4‐Methyl-7‐Ethylcoumarin Derivatives Containing Azo Group

“…Azo dye compounds are utilized in various industries, including nonlinear optics, liquid crystal displays 17,18 , cosmetics, food coloring, polymers, optical switches, and acid-base indicators [19][20][21] . Additionally, heteroaryl-based azo dyes have been studied for their potential biological applications, such as antioxidant [22][23][24] , antimicrobial [25][26][27][28] , antitumor 29 , antidiabetics 30, and antiviral activities 31 . A diazonium salt, created when a primary amine acts as an electrophile 32 , was typically coupled with a nucleophilic coupling component, such as an amine or phenol, to create an azo dye 33 .…”