Supplementary material from "A focused library synthesis and cytotoxicity of quinones derived from the natural product bolinaquinone"

Published on 2018-03-13T17:14:09Z (GMT) by
Bolinaquinone is as a natural product that is a structurally complex, cytotoxic sesquiterpene quinone. A scaffold simplification and focused library approach using a microwave-assisted Suzuki coupling gave 32 bolinaquinone analogues with good-to-excellent cytotoxicity profiles. Mono-arylbenzoquinones, Library A, were preferentially toxic towards BE2-C (neuroblastoma) cells with growth inhibition (GI<sub>50</sub>) values of 4–12 μM; only the 3,4-dimethoxyphenyl <b>23</b> and 3-biphenyl <b>28</b> variants were broad-spectrum active—HT29 (colon carcinoma), U87 and SJ-G2 (glioblastoma), MCF-7 (breast carcinoma), A2780 (ovarian carcinoma), H460 (lung carcinoma), A431 (skin carcinoma), Du145 (prostate carcinoma), BE2-C (neuroblastoma), MIA (pancreatic carcinoma) and SMA (spontaneous murine astrocytoma). Library B with a second aryl moiety exhibited broad-spectrum cytotoxicity with MCF-7 cells’ GI<sub>50</sub> values of 5.6 ± 0.7 and 5.1 ± 0.5 μM for 2,5-dimethoxy-3-(naphthalene-1-yl)-6-(naphthalene-3-yl) <b>33</b> and 2,5-dimethoxy-3-(biaryl-2-yl)-6-(naphthalene-3-yl) <b>36,</b> respectively. Similar potencies were also noted with 2,5-dimethoxy-3,6-diphenyl <b>30</b> against A2780 (GI<sub>50</sub> = 5.9 ± 0.0 μM) and with 2,5-dimethoxy-3-(biaryl-3-yl)-6-(naphthalene-3-yl) <b>37</b> against HT29 (GI<sub>50</sub> = 5.4 ± 0.4 μM), while the 3,4-dimethoxy mono-aryl analogue <b>23</b> exhibited good levels of activity against A2780 (GI<sub>50</sub> = 3.8 ± 0.75 μM), the neuroblastoma cell line BE2-C (GI<sub>50</sub> = 3 ± 0.35 μM) and SMA (GI<sub>50</sub> = 3.9 ± 0.54 μM). Introduction of the amino-substituted Library C gave 2-(naphthalen-1-yl)-5-(naphthalen-3-yl)-3,6-bis(propylamino) <b>43,</b> with excellent activity against HT29 (0.08 ± 0.0 μM), MCF-7 (0.17 ± 0.1 μM), A2780 (0.14 ± 0.1 μM), A431 (0.11 ± 0.0 μM), Du145 (0.16 ± 0.1 μM), BE2-C (0.08 ± 0.0 μM) and MIA (0.1 ± 0.0 μM).

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Ghods, Azadeh; Gilbert, Jayne; Baker, Jennifer R.; Russell, Cecilia C,; Sakoff, Jennette A.; McCluskey, Adam (2018): Supplementary material from "A focused library synthesis and cytotoxicity of quinones derived from the natural product bolinaquinone". The Royal Society. Collection.