Chalcones

A new series of 4-(2-chloroquinolin-3-yl)-6-(6-methyl-1H-benzimidazol-2-yl)pyrimidin-2-amine (Va-k) have been synthesized by the reaction of 3-(2-chloroquinolin-3-yl)-1-(6-methyl-1H-benzimidazol-2-yl)prop-2-en-1-one (IVa-k) with guanidine nitrate in ethanol and aqueous solution of sodium hydroxide. The synthesized compounds were characterized by their IR, 1H NMR and Mass spectral studies. The synthesized compounds were evaluated for anthelmintic activity by in-vitro method, against south Indian adult earth worms Pheretima posthuma using Albendazole as a standard drug. Results of the activities reveal that, compounds exhibited moderate to good anthelmintic activity.

The novel Pyrazoline derivatives were prepared  by cyclisation of substituted chalcone derivatives in the presence of 2, 4 dintro phenyl hydrazine hydrate. Structural elucidation of all synthesized  derivatives were done by spectral analysis ( IR , NMR and Mass spectroscopy). All synthesized derivatives  screened for their anticancer activities by MTT assay and  these prepared derivatives exhibits promising anticancer activities.

Some novel series of pyrazoline derivatives were synthesized from Chalcones. Chalcones were prepared by treatment of Paracetamol with different aldehyde by Claisen-Schimidt Condensation. Various Pyrazoline derivatives were prepared by reflux reaction of Chalcone with Phenyl Hydrazine/Hydrazine Hydrate in ethanolic solution. The structures of the newly synthesized Pyrazoline derivatives have been established on the basis of their spectral data. Structures of compounds were confirmed by IR, H1 NMR. The synthesized selected compounds were screened for their antimicrobial activity.

In the present study a series of 3-(2-Hydroxy-3, 5-dichlorophenyl)-5-(4-chloro phenyl) isoxazole (8a) and 3-(2-Hydroxy-3, 5-dichlorophenyl)-5-(2, 4-chloro phenyl) isoxazole (8b) have been synthesized by refluxing the chalconedibromide (6a) and (6b) with hydroxyl amine hydrochloride in ethanol containing catalytic amount of piperidine. The formation of the above synthesized compounds was confirmed on the basis of their chemical tests and spectral analysis. The synthesized heterocycles then screen for their antimicrobial activity against some kahrip plant pathogens viz. AlternariaMacrospor, XanthomonasCampestris, Pseudomonas syringae and Fusarium Spp. From the above study the result revealed that isoxazole derivatives shows good to moderate antimicrobial activity against plantpathoges.

An efficient and convenient multi component reaction for the synthesis of 2-Imino-4,6-diaryldihydropyrimidines scaffolds have been accomplished from chalcones and guanidine hydrochloride in the presence of a catalytic amount of an alkali under solvent-free conditions using microwave irradiation.  The synthesized pyrimidines have been characterized on the basis of their chemical properties and spectroscopic data.  Operational simplicity, short reaction times, excellent yields and environmentally-benign conditions are the other advantages of this protocol. Using this method, we have synthesized some new pyrimidines with antimicrobial properties and high chemical yields in much short reaction times.