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Two structurally interesting novel apo-tirucallane triterpenoids, piscidinone A and B were isolated from the leaves and twigs of Walsura trifoliata and their structures were elucidated on the basis of spectroscopic data, mainly NMR and MS data, respectively. These novel secondary metabolites have tetracyclic ring and a new type of substituted pyran ring as a side chain, and their biosynthetic origin...
Two novel phragmalin type limonoids have been isolated from the bark of Soymida febrifuga and their structures were fully established on the basis of spectroscopic (especially 2D NMR) and spectrometric (mass spectrometry) data, respectively. These novel secondary metabolites possessed β-furyl ring and an ortho ester functionality and their biosynthetic origin was proposed to be the phragmalin-type...
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