Total synthesis and biological evaluation of (+)- and (-)-bisanthraquinone antibiotic BE-43472B and related compounds.

Total synthesis and biological evaluation of (+)- and (-)-bisanthraquinone antibiotic BE-43472B and related compounds.
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DOI:
10.1021/ja9073694
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发表时间:
2009-10-21
影响因子:
15
通讯作者:
Montero, Ana
Montero, Ana
中科院分区:
化学1区
文献类型:
--
作者:
Nicolaou, K. C.;Becker, Jochen;Lim, Yee Hwee;Lemire, Alexandre;Neubauer, Thomas;Montero, Ana

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双蒽醌抗生素BE-43472B[(+)-1]是由Rowley和他的同事从一株链霉菌菌株中分离出来的,该菌株发现于与海鞘芽胞杆菌相关的绿藻中,对临床分离的甲氧西林敏感、甲氧西林耐药和四环素耐药金黄色葡萄球菌(分别为MSSA、MRSA和TRSA)以及万古霉素耐药粪肠球菌(VRE)显示出良好的抗菌活性。本文描述了该双蒽醌抗生素的两个对映体的首次全合成,其绝对构型的测定,以及这些化合物和相关化合物的生物学评价。所开发的合成依赖于一个高效的级联序列,该序列包括二烯(R)-61和双烯烃55之间的分子间Diels-Alder反应,然后是分子内的亲核芳香族Iso取代。后期转化包括显著的光化学α,β-环氧酮重排[80→(+)-1]。有趣的是,抗生素BE-43472B的非天然对映体[(-)-1]与天然对映体[(+)-1]具有相似的抗菌性能。
The bisanthraquinone antibiotic BE-43472B [(+)-1] was isolated by Rowley and coworkers from a streptomycete strain found in a green algae associated with the ascidian Ecteinascidia turbinata and has shown promising antibacterial activity against clinically derived isolates of methicillin-susceptible, methicillin-resistant, and tetracyclin-resistant Staphylococcus aureus (MSSA, MRSA, and TRSA, respectively), and vancomycin-resistant Enterococcus faecalis (VRE). Described herein is the first total synthesis of both enantiomers of this bisanthraquinone antibiotic, the determination of its absolute configuration, as well as the biological evaluation of these and related compounds. The developed synthesis relies on a highly efficient cascade sequence involving an intermolecular Diels–Alder reaction between diene (R)-61 and dienophile 55 followed by an intramolecular nucleophilic aromatic ipso substitution. Late stage transformations included a remarkable photochemical α,β-epoxyketone rearrangement [80 → (+)-1]. Interestingly, the unnatural enantiomer [(–)-1] of antibiotic BE-43472B exhibited comparable antibacterial properties to those of the natural enantiomer [(+)-1].
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