Synthesis and anticancer activity of a novel class of flavonoids: 2,4-Diarylchromane[4,3-d]-Δ1,9b-1,2,3-thiadiazolines

Cytotoxic Evaluation of (2S)-5,7-Dihydroxy-6-prenylflavanone Derivatives Loaded PLGA Nanoparticles against MiaPaCa-2 Cells

The search for new alternatives for the prevention and treatment of cancer is extremely important to minimize human mortality. Natural products are an alternative to chemical drugs, since they are a source of many potential compounds with anticancer properties. In the present study, the (2S)-5,7-dihydroxy-6-prenylflavanone (semi-systematic name), also called (2S)-5,7-dihydroxy-6-(3-methyl-2-buten-1-yl)-2-phenyl-2,3-dihydro-4H-1-Benzopyran-4-one (CAS Name registered) (1) was isolated from Eysenhardtia platycarpa leaves. This flavanone 1 was considered as the lead compound to generate new cytotoxic derivatives 1a, 1b, 1c and 1d. These compounds 1, 1a, 1b, 1c, and 1d were then loaded in nanosized drug delivery systems such as polymeric nanoparticles (NPs). Small homogeneous spherical shaped NPs were obtained. Cytotoxic activity of free compounds 1, 1a, 1b, 1c, and 1d and encapsulated in polymeric NPs (NPs1, NPs1a, NPs1b, NPs1c and NPs1d) were evaluated against the pancreatic cancer cell line MiaPaCa-2. The obtained results demonstrated that NPs1a and NPs1b exhibited optimal cytotoxicity, and an even higher improvement of the cytotoxic efficacy was exhibited with the encapsulation of 1a. Based on these results, NPs1a were proposed as promising anticancer agent candidates.

New 1,3,4-bisthiadiazolines: synthesis, characterization and antimicrobial evaluations

The bisthiadiazolines 4a-4g have been synthesized in good yields from the cyclization reactions of bisthiosemicarbazones 3a-3g with acetic anhydride. The condensation reaction of dibenzaldehydes 2a-2g with thiosemicarbazide in alcoholic medium provided 3a-3g and former were obtained from the O-alkylation of 3-hydroxybenzaldehyde with suitable 1,ω-dibromoalkanes under alkaline conditions in the presence of dry EtOH/DMF. The intermediates 3a-3g and bishetrocyclics 4a-4g were also screened for their in vitro antimicrobial activities against seven bacterial strains (Klubsellia pneumoniae, Pseudomonas aeruginosa, Escherichia coli, Straphylococcus aureus, Bacillius subtilis, Pseudomonas fluorescens and Streptoccus pyrogens) and five fungi strains (Aspergillius janus, Pencillium glabrum, Fusarium oxysporum, Aspergillus sclerotiorum, Aspergillus niger). The compounds 3f, 3g, 4f &4g were found to be significantly active against the tested microorganisms.

Synthesis and Antitumour Activity of a Novel Class of Flavanones: 1,4-diaryl-1,4-dihydrochromeno[4,3-c]pyrazoles

A new series of 1,4-diaryl-1,4-dihydrochromeno[4,3- c]pyrazoles have been synthesised. The target compounds and their analogues (2,4-diaryl-2,4-dihydrochromeno[4,3- c]pyrazoles) were tested for their antitumour activities in vitro against MCF-7 and HL-60 cells using the MTT method. Among these compounds, 1,4-bis(4-chlorophenyl)-1,4-dihydrochromeno[4,3- c]pyrazole was found to have potent antitumour activity in vitro with minimum IC50 of 25.31 μg mL−1 and 13.86 μg mL−1 against MCF-7 and HL-60 cells respectively.

New Vilsmeier reaction for facile synthesis of 4-phenyl-2,4-dihydrochromeno[4,3-c]pyrazoles with bis(trichloromethyl) carbonate/DMF

An efficient method for the synthesis of 4-phenyl-2,4- dihydrochromeno[4,3-c]pyrazoles via the cyclisation reaction of the easily available flavanone-4-arylhydrazones with Vilsmeier reagent (Bis(trichloromethyl) carbonate /DMF) has been developed.