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Bioassay-guided fractionation of an extract prepared from the fruits of Cordia sebestena led to the isolation of sebestenoids A–D (1–4). Their structures were elucidated on the basis of extensive NMR experiments and mass spectroscopic measurements. Compounds 1–4 exhibited moderate inhibition of the aspartic protease BACE1.
Pipermethystine (1), 3α,4α-epoxy-5β-pipermethystine (2) and awaine (3) were isolated from the aerial parts of kava (Piper methysticum G. Forster, Piperaceae) and identified by HRMS and NMR spectroscopic analysis. 1 was concentrated in the stem peelings and leaves. 2 and 3 are new alkaloids with 2 found only in cv. Isa among the 11 cultivars examined, and 3 occurred primarily in young leaves of all...
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