Hetero Diels–Alder reactions of o-thioquinones with cyclic dienes: an efficient synthesis of novel heterocyclic compounds

[4+2] Cycloaddition Reactions of β-Naphtha-1-thioquinones Generated from 2-Naphthols and DAST

An original and facile method for the generation of β-naphtha-1-thioquinone using DAST and 2-naphthol has been developed. A series of dehydro-2-naphthol-1-sluphides or naphtha-oxathiane derivatives were synthesized by in-situ Diels-Alder cycloaddition...

Synthesis and anti-Trypanosoma cruzi activity of β-lapachone analogues

The available chemotherapy for Chagas disease, caused by Trypanosoma cruzi, is unsatisfactory; therefore, there is an intense effort to find new drugs for the treatment of this disease. In our laboratory, we have analyzed the effect on bloodstream trypomastigotes of 16 new naphthoquinone analogues of β-lapachone modified in the pyran ring, aiming to find a new prototype with high trypanocidal activity. The new compounds presented a broad spectrum of activity, and five of them presented IC(50)/24 h in the range of 22-63 μM, whereas β-lapachone had a higher value of 391.5 ± 16.5 μM.