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Total Synthesis of Reniochalistatin E.
Journal of Natural Products 2017 December 23
Reniochalistatin E (1) is one of the five related cyclic peptides isolated from the marine sponge Reniochalina stalagmitis. The discovery of these compounds resulted from a screening program directed toward the identification of proline-rich bioactive compounds. Reniochalistatin E is the only member of the family to possess a tryptophan amino acid residue. Given the cytotoxicity observed for 1, efforts were directed toward developing a synthetic route to 1. The first total synthesis of 1 has been accomplished in a 15-step route in an overall 5.0% yield. The synthetic sample of reniochalistatin E was shown to have similar activity toward HeLa and RPMI-8226 cell lines compared to the natural sample, with IC50 values of 16.9 vs 17.3 μM and 4.5 vs 4.9 μM, respectively. Interestingly, both of the fully deprotected octapeptides constructed toward the synthesis of reniochalistatin E were shown to have cytotoxicity. The route provides a means to probe the structure-activity relationship of 1 and further biological investigations.
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