PEG-400: An efficient and recyclable reaction medium for the synthesis of pyrazolo[1,5-a]pyrimidines

An efficient and convenient route is described for the synthesis of new pyrazolo [1,5-a] pyrimidine derivatives by the reaction of 4-(4’-chloro-phenylazo)-5-amino pyrazole with α,β-unsaturated carbonyl compounds (chalcones) using polyethylene glycol (PEG-400) as benign reaction medium. The advantage of this protocol includes the excellent yields, operational simplicity, short reaction times and avoidance of volatile organic solvents and expensive catalysts

Poboljšan postupak sinteze nekih novih 1,3-diaril-2-propen-1-ona koristeći PEG-400 kao reciklirajuće otapalo i njihovo antimikrobno vrednovanje

A simple and convenient route is described for the synthesis of novel hetero 1,3-diaryl-2-propen-1-ones (chalcones) by using recyclable poly PEG-400 as an alternative reaction solvent. The reaction is clean with excellent yield, shorter reaction time and reduces the use of volatile organic compounds (VOCs). All the synthesized compounds were evaluated for their antimicrobial activities against several pathogenic representatives.Opisana je jednostavna i pogodna metoda sinteze novih hetero 1,3-diaril-2-propen-1-ona (kalkona) koristeći poli(etilenglikol) (PEG-400) kao alternativno otapalo. Reakcija je jednoznačna, a uporaba hlapljivih organskih otapala je smanjena. Iskorištenja na produktima su visoka, a reakcijska vremena kraća. Svi sintetizirani spojevi testirani su na antimikrobno djelovanje na nekoliko patogenih mikroorganizama

A novel and efficient approach for the synthesis of new halo substituted 2-arylpyrazolo[4,3-c] coumarin derivatives

A convenient protocol for the efficient synthesis of 2-arylpyrazolo[4,3-c]coumarins is described. The synthesis route involves molecular iodine catalyzed oxidative cyclization of 1-phenyl-3-(2'-hydroxyaryl)-4-formyl pyrazoles in dimethylsulfoxide. During the lactonisation of 4-formylpyrazoles, we found that iodine was incorporated into the unsubstituted O/P position of the 3-(2'-hydroxyaryl) group. Under similar conditions o-allyloxy derivative of pyrazoles gave same corresponding lactone derivatives by deallylation, lactonisation, and iodination in one step

NaOH/PEG-400: An eloquent system for the synthesis of new thienyl benzo[b]1,4-diazepines

A simple and eloquent procedure for the synthesis of a new series of thienyl benzo[b]1,4-diazepines is reported. They were synthesized by the condensation of o-phenylenediamine (o-PDA) with distinct hetero chalcones using NaOH in polyethylene glycol (PEG-400) as green and alternative reaction solvent. The significances of this present method are shorter reaction time, easy work-up, high yields, and mild reaction conditions. Furthermore, this method is environment friendly and without use of an expensive catalyst. The all newly synthesized compounds are characterized by the spectroscopic methods

A Convenient Synthesis of Some Novel Hydroxy Pyrazolines under Thermal Condition and Their Antimicrobial Activity 1

Abstract: In the present communication, a series of 1-hydro-2-pyrazolines 2(a-f) and 1-acetyl-2-pyrazoline 3(a-f) derivatives have been prepared by the treatment of chalcones 1(a-f) with hydrazine hydrate in ethyl alcohol under reflux condition. The newly synthesized products were confirmed by the spectral analysis. Furthermore, these compounds were evaluated for their antimicrobial activity

Multicomponent One-Pot Synthesis of Substituted Hantzsch Thiazole Derivatives Under Solvent Free Conditions

Thiazole derivatives were prepared by one-pot procedure by the reaction of α-haloketones, thiourea and substituted o-hydroxybenzaldehyde under environmentally solvent free conditions