Two new neoclerodane diterpenoids, 6-deacetyl-teucrolivin A (5) and 8β-hydroxy-teucrolivin B (6), were isolated from the aerial parts of Teucrium orientale, along with four already known neoclerodane diterpenoids, teucrolivin A (1), teucrolivin B (2), teucrolivin C (3) and teucrolivin H (4), previously isolated from Teucrium oliverianum. Their structures were elucidated on the basis of spectroscopic evidence and chemical transformations. Compounds 1—3 were assayed for antifeedant activity against Spodoptera littoralis, S. frugiperda and Heliocoverpa armigera. Teucrolivin A was the most potent of the three compounds tested.
BRUNO M, ROSSELLI S, MAGGIO A, PIOZZI F, SCAGLIONI L, ARNOLD N A, et al. (2004). Neoclerodanes from Teucrium orientale. CHEMICAL & PHARMACEUTICAL BULLETIN, 52, 1497-1500 [10.1248/cpb.52.1497].
Neoclerodanes from Teucrium orientale
BRUNO, Maurizio;ROSSELLI, Sergio;MAGGIO, Antonella Maria;
2004-01-01
Abstract
Two new neoclerodane diterpenoids, 6-deacetyl-teucrolivin A (5) and 8β-hydroxy-teucrolivin B (6), were isolated from the aerial parts of Teucrium orientale, along with four already known neoclerodane diterpenoids, teucrolivin A (1), teucrolivin B (2), teucrolivin C (3) and teucrolivin H (4), previously isolated from Teucrium oliverianum. Their structures were elucidated on the basis of spectroscopic evidence and chemical transformations. Compounds 1—3 were assayed for antifeedant activity against Spodoptera littoralis, S. frugiperda and Heliocoverpa armigera. Teucrolivin A was the most potent of the three compounds tested.
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