Synthesis and antifungal activity of 2/3-arylthio- and 2,3-bis(arylthio)-5-hydroxy-/5-methoxy-1,4-naphthoquinones

2/3-Arylthio- and 2,3-bis(arylthio)-5-hydroxy-/5-methoxy-1,4-naphthoquinones 5-9 were synthesized and tested for in vitro antifungal activity against Candida species and Aspergillus niger. The synthesized compounds 5-9 generally showed good activities against Candida albicans and C. tropicalis. The results suggest that the 1,4-naphthoquinones 5-9 would be potent antifungal agents.