Virosaines A and B, Two New Birdcage-Shaped <i>Securinega</i> Alkaloids with an Unprecedented Skeleton from <i>Flueggea virosa</i>
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Two new Securinega alkaloids, virosaines A (1) and B (2), were isolated from the twigs and leaves of Flueggea virosa. The structures and absolute configurations were elucidated by means of NMR, X-ray diffraction, and CD analyses. Compounds 1 and 2 represent the first examples of Securinega alkaloids bearing a 7-oxa-1-azabicyclo[3.2.1]octane ring system, whose plausible biogenetic pathways were also proposed.
创建时间：
2012-06-15
