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Three new phthalide derivatives from culture broth of Dentipellis fragilis and their cytotoxic activities


Three new phthalide derivatives (13) together with two known compounds, erinaceolactone B (4) and hericerin III (5), were isolated from the culture broth of Dentipellis fragilis. The chemical structures of 15 were determined by analyses of their 1D-, 2D-NMR, and MS. The absolute configuration of 1 was determined by CD analysis. The isolated compounds were assessed for their cytotoxic activities against A549, DU145, HCT116, and HT1080 cancer cell lines. Compounds 15 showed strong cytotoxic activities against DU145, with IC50 values ranging from 14.3 to 16.1 µM. Additionally, all compounds showed moderate or weak cytotoxic activities against all cell lines except for compounds 4 and 1 which showed no cytotoxic activities against A549 and HCT116 cancer cell lines, respectively. Against HT1080 cancer cell line, only compound 2 displayed moderate cytotoxic activity.

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This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (2021R1I1A1A01055657). This paper was supported by research funds of Jeonbuk National University in 2023 and authors thank Ms. Ji-Young Oh, Center for University-wide Research Facilities (CURF) at Jeonbuk National University, for performing NMR measurements.

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Correspondence to Dae-Won Ki or Bong-Sik Yun.

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Ki, DW., Choi, DC., Won, YS. et al. Three new phthalide derivatives from culture broth of Dentipellis fragilis and their cytotoxic activities. J Antibiot 77, 338–344 (2024).

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