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New Phloroglucinol Derivatives from Hypericum papuanum

Winkelmann, Karin ; Heilmann, Jörg ; Zerbe, Oliver ; Rali, Topul ; Sticher, Otto


Bioactivity-guided fractionation of the petroleum ether ext. of the aerial parts of Hypericum papuanum led to the isolation of five new tricyclic phloroglucinol derivs. On the basis of extensive 1D and 2D NMR expts. as well as MS studies, their structures were elucidated as the C-3 epimers of 8-hydroxy-4,4,7-trimethyl-9-(2-methylpropionyl)-3-(1-methylvinyl)-5beta ...


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