Arylidene pyruvic acids motif in the synthesis of new thiopyrano[2,3-d]thiazoles as potential biologically active compounds

Novel

Synthesis and Biological Activity of New Thiopyrano[2,3-d]thiazoles Containing a Naphthoquinone Moiety

Novel 11-substituted 3,11-dihydro-2H-benzo[6,7]thiochromeno[2,3-d][1,3]-thiazole-2,5,10-triones 4a-i were synthesized in 75-90% yields via the hetero-Diels-Alder reaction of 5-arylidene-4-thioxo-2-thiazolidinones with 1,4-naphthoquinone. The synthesized compounds were evaluated for their antineoplastic and antimycobacterial activities. A moderate selectivity against melanoma cancer cells (GI50 (UACC-257-melanoma) = 0.22 μM) was demonstrated for 4i, whereas derivatives 4a, 4c, 4g, and 4h showed promising antimycobacterial activity at a low toxicity level.

New thiazolidones-4 with pyrazolone-5 substituent as the potential NSAIDs

The synthesis of a group of thiazolidine derivatives with pyrazolone-5 substituent is described. The structure of the new compounds is supported by 1H- and 13C-NMR spectra. Group of compounds was tested in vivo for their antiinflammatory activity. The obtained results gave the opportunity to separate the perspective groups of potential NSAIDs, which have got greater antiinflammatory activity than the best standard drugs.