General approach for preparing epidithiodioxopiperazines from trioxopiperazine precursors: enantioselective total syntheses of (+)- and (-)-gliocladine C, (+)-leptosin D, (+)-T988C, (+)-bionectin A, and (+)-gliocladin A.

General approach for preparing epidithiodioxopiperazines from trioxopiperazine precursors: enantioselective total syntheses of (+)- and (-)-gliocladine C, (+)-leptosin D, (+)-T988C, (+)-bionectin A, and (+)-gliocladin A.
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DOI:
10.1021/ja400315y
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发表时间:
2013-03-13
影响因子:
15
通讯作者:
Overman, Larry E.
Overman, Larry E.
中科院分区:
化学1区
文献类型:
--
作者:
DeLorbe, John E.;Horne, David;Jove, Richard;Mennen, Steven M.;Nam, Sangkil;Zhang, Fang-Li;Overman, Larry E.

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A common strategy for preparing tryptophan-derived epidithiodioxopiperazine (ETP) natural product containing a hydroxyl substituent adjacent to a quaternary carbon stereocenter is reported. This strategy is exemplified by enantioselective total syntheses of four heptacyclic ETP natural products — gliocladine C (6), leptosin D (7), T988C (8), and bionectin A (9)—starting with the di-(tertbutoxycarbonyl) derivative 17 of the trioxopiperazine natural product gliocladin C, which is readily available by enantioselective chemical synthesis. In addition, total syntheses of the enantiomer of gliocladine C (ent-6) and gliocladin A (11), the di(methylthio) congener of bionectin A, are reported. These syntheses illustrate a synthetic strategy wherein diversity in the dioxopiperazine unit of ETP natural products is introduced at a late stage in a synthetic sequence. In vitro cytotoxicity of compounds in this series against invasive human prostrate (DU145) and melanoma (A2058) cancer cell lines is described and compared to that of chaetocin A (4).
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