منابع مشابه
ALKALOIDS OF BORAGINACEAE II [I], PYRROLIZIDINE, ALKALOIDS OF HELIOTROPIUM E UROPAEUM L. POPULATION GARMSAR
Helitropium europaeum L. population Garmsar was shown to contain three major alkaloids: heliotrine N-oxide (2), lasiocarpine (4) and lasiocarpine N-oxide (5); and four minor alkaloids: heliotrine (I), europine (3), acetyllasiocarpine (6) and a novel alkaloid acetyllasiocarpine N-oxide (7).
متن کاملStereoselective Synthesis of Quinolizidine Alkaloids: (–)-Lasubin II
Initially, lasubin II was synthesized diastereoselectively in racemic form [3]. Asymmetric syntheses of lasubin II were achieved based on stereoselective transformations of enantiomerically pure substrates [4] or, for example, via a diastereoselective aza-Diels-Alder reaction using a resolved chiral arylaldehyde tricarbonylchromium complex [5]. Recently, an enantioselectively catalyzed aza-Diel...
متن کاملalkaloids of boraginaceae ii [i], pyrrolizidine, alkaloids of heliotropium e uropaeum l. population garmsar
helitropium europaeum l. population garmsar was shown to contain three major alkaloids: heliotrine n-oxide (2), lasiocarpine (4) and lasiocarpine n-oxide (5); and four minor alkaloids: heliotrine (i), europine (3), acetyllasiocarpine (6) and a novel alkaloid acetyllasiocarpine n-oxide (7).
متن کاملα-Glucosidase Inhibitors from Vauquelinia corymbosa.
The α-glucosidase inhibitory activity of an aqueous extract and compounds from the aerial parts of V. corymbosa was demonstrated with yeast and rat small intestinal α-glucosidases. The aqueous extract inhibited yeast α-glucosidase with a half maximal inhibitory concentration (IC50) of 28.6 μg/mL. Bioassay-guided fractionation of the extract led to the isolation of several compounds, including o...
متن کاملIsolation of Urosilic Acid from Knoxia corymbosa
Air-dried, milled leaves of Knoxia corymbosa (220 gm) were extracted repeatedly with dichloromethane. After removal of solvent in vacuo, the CH2Cl2-solvent residue was fractionated by using hexane and ethyl acetate solvents. After fractionation, all fractions are submitted for NMR spectroscopy. Out of all fractions interesting fractions are subjected to column chromatography, so that we isolate...
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ژورنال
عنوان ژورنال: Journal of Crystal and Molecular Structure
سال: 1974
ISSN: 0308-4086,1572-8854
DOI: 10.1007/bf01197915