Synthesis and evaluation of novel marine bromopyrrole alkaloid-based hybrids as anticancer agents.

A series of twenty three novel hybrids of marine bromopyrrole alkaloids with chalcone, isoxazole and flavone structural features were synthesized and evaluated for in vitro anticancer activity by MTT assay against five human cancer cell lines. Among the synthesized chalcones, hybrids 4a and 4h (IC50 range: 0.18 µM-12.00 µM) showed anticancer activity against all the tested cancer cell lines. Promising cytotoxic activities were exhibited by flavones derivatives, 5a and 5b (0.41 µM-1.28 µM) against cell lines PA1 and KB403. Isoxazole hybrids, 6b-6e selectively inhibited oral and mouth cancer cell line KB403, among which 6c (IC50 = 2.45 µM) was found to be most active.

Synthesis and evaluation of novel 1,3,4-oxadiazole derivatives of marine bromopyrrole alkaloids as antimicrobial agent.

In an attempt to identify new potential lead as antimicrobial agent, twenty hybrids of marine bromopyrrole alkaloids with 1,3,4-oxadiazole were designed based on molecular hybridization technique and synthesized. Synthesized molecules were evaluated for their antibacterial, antifungal and antitubercular activities. Hybrids 5d, 5i, 5j and 5k exhibited equivalent antibacterial activity (MIC of 1.56 µg/mL) compared with standard drug ciprofloxacin against Staphylococcus aureus and Escherichia coli. Equal antifungal activity (MIC of 1.56 µg/mL) was shown by of hybrids 5j, 5k and 7d compared with standard Amphotericin-B. The inhibition of Mycobacterium tuberculosis at concentrations as low as 1.6 and 1.5 µg/mL by compounds 5f and 7d respectively indicates that these compounds can act as leads for development of newer anti-TB compounds.