Abstract
The aerial parts of
Teucrium oliverianum yielded the
neo-clerodane diterpenoids teucrolin E–G. The previously proposed structure for teucrolin E was revised so that it contains a tetrahydrofuran ring instead of an oxetane ring.
The aerial parts of
Teucrium oliverianum yielded two
neo-clerodane diterpenoids, teucrolin F and G, together with the known teucrolin E. The previously proposed structure for teucrolin E was revised so that it contains a tetrahydrofuran ring instead of an oxetane ring. This was based on analysis of the NMR spectroscopic data of its diacetate, including its NOE spectra. In addition, the structural assignments of the new diterpenoids were based on
1H and
13C NMR spectroscopic studies, mainly 2D NMR experiments, including homonuclear and heteronuclear correlations.