One Pot Synthesis and Biological Evaluation of Pyranopyrazole in Aqueous Medium

Abstract

A simple and green one pot protocol for the synthesis of pyranopyrazoles using ultrasonication waves in aqueous medium has been developed. Advantages of this method are it provides operational simplicity and environment-friendly green approach.

Green multicomponent synthesis of pyrano[2,3-c]pyrazole derivatives: current insights and future directions

“…Majid Koohshari et al 90 have outlined a method for synthesizing pyrano[2,3-c]pyrazoles where dialkyl 3-oxopentanedioate, Scheme 39 Synthesis of pyranopyrazole derivatives in aqueous medium using piperidine. Under the ultrasound irradiation method, Priya M. Khandare et al 93 synthesized pyranopyrazoles in an aqueous medium using lanthanum(III) nitrate as a catalyst. The reaction conditions were optimized by performing the model reaction of 4hydroxybenzaldehyde, ethyl acetoacetate, hydrazine hydrate, and lanthanum(III) nitrate under different conditions.…”

“…Under the ultrasound irradiation method, Priya M. Khandare et al 93 synthesized pyranopyrazoles in an aqueous medium using lanthanum( iii ) nitrate as a catalyst. The reaction conditions were optimized by performing the model reaction of 4-hydroxybenzaldehyde, ethyl acetoacetate, hydrazine hydrate, and lanthanum( iii ) nitrate under different conditions.…”

Eco-friendly Synthesis of 1, 4-Dihydropyrano-[2,3-c] Pyrazoles Using Copper Nanoparticles Grafted on Carbon Microsphere as a Heterogeneous Catalyst

“…These developed catalytic metallic nanoparticles are inexpensive, non or minimally poisonous, highly active, stable, and easily separable from reaction mixture are highly useful. In our previous work, copper nanoparticles grafted on carbon microsphere (Cu-NP/C) were found to be useful for organic transformations [36][37]. In continuation of our previous work [38][39][40], herein, we report a new eco-friendly three-component protocol for the synthesis of 1,4-dihydropyrano[2,3-c] pyrazole derivatives using Cu NP/C as a heterogeneous catalyst in water and ethanol (1:1) solvent (Scheme 1).…”

One Pot Synthesis of Pyranopyrazole Using Sodium Lactate as an Efficient Catalyst

“…Pyranopyrazolescaffolds are reported for various biological activities such as analgesic, anti-inflammatory, 1 antibacterial, 2 anti-microbial, 3 andantitumor activity. 4 Many methods are reported for the synthesis of pyranopyrazoles involving the use of three or four component condensation using CeCl3, 5 InCl3, 6 La(NO3)3, 7 ionic liquids such as [(CH2)4SO3HMIM][HSO4], 8 [H-NMP][MeSO3], 9 cetyltrimethylammonium chloride, 10 amino acids such as glycine, 11 L-tyrosine, 12 nano-particles such as CuI, 13 Fe3O4, 14 Fe3O4@SiO2, 15 1,3,5-triazine-2,4,6triamine modified nano rice husk silica, 16 MgO, 17 ZnO, 18,19 and vitamin B1 on silica coated ferrite (Fe2O3@SiO2) nanoparticles. 20 Some heterogeneous catalysts like cerium (IV) carboxymethylcellulose, 21 acidic montmorillonite K-10 clay 22 are also documented for the one pot synthesis of pyranopyrazoles.…”