Organic Letters 2010-Jan
Highly functionalized daphnane diterpenoids from Trigonostemon thyrsoideum.
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Trigonothyrins A-C (1-3), which are highly functionalized daphnane diterpenoids, were isolated from the stems of Trigonostemon thyrsoideum. Compounds 1-3 represent the first examples of daphnanes with an oxygen-bridged four-membered-ring system, and a linkage mode of 12,13,14-orthoester. Compound 3 was observed to inhibit HIV-1 induced cytopathic effects. The EC(50) value was 2.19 microg/mL, and the therapeutic index (TI) was more than 90.
