Synthesis and antifungal activity of new dihydrofurocoumarins and dihydrofuroquinolines

Authors: ASLI USTALAR, MEHMET YILMAZ, AGİM OSMANİ, SEMA AŞKIN KEÇELİ

Abstract: We investigated the radical addition of 4-hydroxycoumarin (1a) and 4-hydroxyquinoline (1b) with conjugated dienes ({2a-f) mediated by cerium(IV) ammonium nitrate (CAN) resulting in ethenyl substituted 2,3-dihydrofurocoumarin (3a-f) and 3,5-dihydrofuroquinoline (3g, 3h) compounds in moderate to good yields. All compounds were characterized by spectroscopic methods (IR, MS, and $^{1}$H and $^{13}$C NMR) and microanalysis. Antifungal activities of these compounds were investigated against the fungi Candida albicans, C. parapsilosis, C. krusei, C. glabrata, C. tropicalis, and Aspergillus fumigatus.

Keywords: Dihydrofurocoumarin, dihydrofuroquinoline, cerium(IV) ammonium nitrate, radical cyclization

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