4.8 Article

Fluvirosaones A and B, Two Indolizidine Alkaloids with a Pentacyclic Skeleton from Flueggea virosa

Journal

ORGANIC LETTERS
Volume 20, Issue 4, Pages 991-994

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/acs.orglett.7b03935

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Funding

  1. National Natural Science Foundation of China [81473138, 81573310, 81603030]
  2. Ministry of Science and Technology of China [2017ZX09305010]
  3. Medical Scientific Research Foundation of Guangdong Province [A2014212]

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Fluvirosaones A (1) and B (2), together with virosecurinine (3), were isolated from Flueggea virosa. Their structures were determined by physical, spectroscopic, and X-ray analysis and confirmed through comparison of the calculated and experimental C-13 NMR and electronic circular dichroism (ECD) data. Compounds 1 and 2 represent the first examples of a pentacyclic Securinega alkaloid containing a pentacyclic system and an alpha,beta-unsaturated ketone. Plausible biogenetic pathways of compounds 1 and 2 are proposed.

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