Concise Total Synthesis of (+)-Gliocladins B and C.

Concise Total Synthesis of (+)-Gliocladins B and C.
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DOI:
10.1039/c2sc20270k
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发表时间:
2012-01-01
期刊:
影响因子:
8.4
通讯作者:
Movassaghi M
Movassaghi M
中科院分区:
化学1区
文献类型:
--
作者:
Boyer N;Movassaghi M

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报道了(+)-胶粘剂B的首次全合成。我们的简明和对体选择性合成利用了一种新的基于friedel - crafts的区域选择性策略,提供了一种高效的多克尺度的C3-(3 ' -吲哚基)六氢吡咯吲哚亚结构,这种分子基础存在于一个重要的聚硫代二酮哌嗪天然生物碱亚群中。我们的第一代(+)-gliocladin B的解决方案涉及(+)-12-脱氧生物连接素A的立体选择性形成,这是一种合理的生物合成前体。我们的合成澄清了(+)-gliocladin B的C15立体化学,并允许其完整的结构确认。对多用途二羟基化二酮哌嗪的进一步研究提供了一种简洁有效的合成(+)-gliocladin B以及(+)-gliocladin C的途径。
The first total synthesis of (+)-gliocladin B is described. Our concise and enantioselective synthesis takes advantage of a new regioselective Friedel–Crafts-based strategy to provide an efficient multigram-scale access to the C3-(3′-indolyl)hexahydropyrroloindole substructure, a molecular foundation present in a significant subset of epipolythiodiketopiperazine natural alkaloids. Our first-generation solution to (+)-gliocladin B involved the stereoselective formation of (+)-12-deoxybionectin A, a plausible biosynthetic precursor. Our synthesis clarified the C15 stereochemistry of (+)-gliocladin B and allowed its full structure confirmation. Further studies of a versatile dihydroxylated diketopiperazine provided a concise and efficient synthesis of (+)-gliocladin B as well as access to (+)-gliocladin C.