The pharmacological effects of laurotetanine on rat isolated thoracic aorta were examined. The contraction of aortic rings caused by high potassium (60 mM) and cumulative concentrations of calcium (0.03-3 mM) was inhibited by 3-50 microM laurotetanine in a dose-dependent manner with an IC50 value of
A new aporphine alkaloid (1), together with five known analogues (2-6), has been isolated from the branch of Litsea greenmaniana by using various chromatographic techniques. Their structures were identified by spectroscopic data analysis ( MS, IR, 1D and 2D NMR) as
Six aporphine alkaloids glaucine, boldine, norboldine, isoboldine, norcorydine and laurotetanine have been isolated from the ethanolic extract of the stems of LITSEA WIGHTIANA in which spasmolytic, hypothermic and blood pressure lowering activities have been confirmed.
A phytochemical investigation on the roots and stems of Litsea cubeba led to the isolation of seven isoquinolone alkaloids. By spectroscopic analysis and comparison of their 1H and 13C-NMR data with those in literatures, these alkaloids were identified as (+)-norboldine (1), (+)-boldine (2),
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