Twelve new analogues of gabapentin (GBP) derived hydrazide-hydrazone scaffolds were produced by using various electronically and structurally divergent aromatic aldehydes. All the hydrazones were obtained in moderate to good yields (66-82%) by heating the GBP hydrazide with respective aldehydes to a temperature of 45-65 °C for 4-7 h. Further, the compounds were explored for their antimicrobial activity on three different Gram positive (Micrococcus luteus, Streptococcus mutans, Enterococcus faecalis) and Gram negative bacterial strains (Salmonella enterica, Alcaligenes faecalis, Pseudomonas aeruginosa). The antibacterial results obtained were found to be good against Gram positive bacteria when compared to Gram negative bacteria. Moreover, the compounds were also screened for antioxidant activity at four different concentrations using the DPPH method and the results showed that some of the compounds were moderately active.

A series of new N-aryl substituted phenyl acetamide analogs of 3-methyl-[1,2,4] triazolo[3,4-a] phthalazines were synthesized starting from commercially available, in-expensive phthalic anhydride in good yields (65-75 %) via Suzuki Coupling. These compounds were tested for inhibition activity against HCT 116 cancer cell line by using MIT assay. Among the library of compounds, N-(3-methoxyphenyl)-2-(4-(3-methyl-[1,2,4]triazolo[3,4-a]phthalazin-6-yl)phenyl) acetamide followed by 2-(4-(3-methyl-[1,2,4]triazolo[3,4-a]phthalazin-6-yl)phenyl)-N-(m-tolyl) acetamide and  N-(3-chlorophenyl)-2-(4-(3-methyl-[1,2,4]triazolo[3,4-a]phthalazin-6-yl)phenyl) acetamide  were found to be active compounds with IC50 of 70 to and 90 µg mL-1. Further, the compounds were also screened for their antimicrobial activities.

Some new analogues of trifluoromethylphenyl acrylic acid scaffold derived hydrazide-hydrazones (4a-l) were produced by using various structurally divergent aromatic aldehydes. All the hydrazones were obtained in moderate to good yields (64-78%) in methanol at a temperature of 45-65 °C. All the compounds were screened for antioxidant activity by DPPH method and the compounds 4c, 4d, 4e and 4h were found to be showed maximum antioxidant activity among the synthesized compounds.