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Alstorisine A (1), a novel nor-monoterpenoid indole alkaloid with 6/5/6/6 fused-ring system, regarded as a key intermediate from melodinine E to mersicarpine, was isolated from the cecidogenous leaves of Alstonia scholaris. Its structure was identified on the basis of extensive spectroscopic analysis and the comparison of experimental and calculated ECDs. A plausible biogenesis was also postulated.
Hypercohin K (1), the first polycyclic polyprenylated acylphloroglucinol possessing a unique spiro-fused cyclopropane ring, together with hyphenrone L (2) representing the most complex congeners featured with a hexacyclic core, was isolated from Hypericum cohaerens. The structure of 1 was elucidated by extensive MS and NMR spectroscopic data. The absolute configuration was defined by comparison of...
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