Abstract
Chemical investigation of the Jatropha multifida has led to the isolation of nine diterpenoids (1–9), including a new jatromulone A, four podocarpane diterpenoids (2–5), two lathyrane-type diterpenoids (6 and 7) and two dinorditerpenoids (8 and 9). Their structures were elucidated by spectroscopic analysis, and the absolute configurations of 1 were determined by CD analysis. All of the diterpenoids were screened for inhibitory activity against thioredoxin reductase (TrxR), which is a potential target for cancer chemotherapy with redox balance and antioxidant functions. Compounds 6 and 7 exhibited stronger activity (IC50: 23.4 and 10.6 μM, respectively) than the positive control, curcumin (IC50 = 25.0 μM). Compounds 2–9 were isolated from J. multifida for the first time.
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