期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 134, 期 3, 页码 1474-1477出版社
AMER CHEMICAL SOC
DOI: 10.1021/ja210986f
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资金
- National Science Foundation [CHE-0846427]
- National Institutes of Health [GM-33049]
- Victoria University of Wellington
- Direct For Mathematical & Physical Scien
- Division Of Chemistry [0948222] Funding Source: National Science Foundation
The first synthesis of the biologically active humulene natural product asteriscunolide D has been accomplished in nine steps without the use of protecting groups. The challenging 11-membered ring was forged via a diastereoselective thionium ion initiated cyclization, which constitutes a formal aldol disconnection to form a strained macrocycle. A stereospecific thioether activation elimination protocol was developed for selective E-olefin formation, thus providing access to the most biologically active asteriscunolide. The absolute stereochemical configuration was established by the Zn-ProPhenol catalyzed, enantioselective addition of methyl propiolate to an aliphatic aldehyde to afford a gamma-hydroxy propiolate as a handle for butenolide formation via Ru-catalyzed alkene-alkyne coupling.
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