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
中科院分区:
文献类型:
--
作者:
Boyer N;Movassaghi M
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.