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Sporulaminals A and B: a pair of unusual epimeric spiroaminal derivatives from a marine-derived fungus Paraconiothyrium sporulosumYK-03
Ist Teil von
RSC advances, 2016-04, Vol.6 (48), p.42361-42366
Erscheinungsjahr
2016
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
Sporulaminals A (1) and B (2), a pair of unusual epimeric spiroaminal derivatives, bearing a 6/4/5/5 tetracyclic ring system derived from bergamotane sesquiterpenoid, were isolated from a marine-derived fungus Paraconiothyrium sporulosumYK-03. Their structures including the absolute configurations were elucidated by extensive NMR experiments, crystal X-ray diffraction and computational electronic circular dichroism (ECD) method. Furthermore, the epimerization induced by pH, temperature and H sub(2)O was revealed, together with the hypothetical biosynthetic pathway.