Strychnos 1990 - 2004 - Crops for the Future

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Author Title Year Source title Reference Abstract He, S. W. and V. H. Rawal General strategy for the synthesis of Strychnos alkaloids 1999 Abstracts of Papers of the American Chemical Society 218(Aug): U208-U209 - Author Title Year Source title Reference Abstract Julien-Laferriere, D. Fruit consumption, seed dispersal and seed fate in the vine Strychnos erichsonii in 1999 Revue D Ecologie 54(4): 315-326 - Author Title Year Source title Reference Kizil, M., B. Patro, O. Callaghan, J. A. Murphy, H. B. Hursthouse and D. Hibbs Tandem radical cyclizations on iodoaryl azides: Synthesis of the core tetracycle of 1999 Journal of Organic Chemistry 64(21): 7856-7862 Abstract A new stereoselective approach to the tetracyclic core of Aspidosperma, alkaloids is described. Selective attack by tristrimethylsilylsilyl radicals on the aryl carbon-iodine bond of iodoaryl azides was first demonstrated on the simple model 15, thus both extending the recent discoveries of Kim and co-workers on aliphatic C-I bonds and demonstrating that the selectivity can be exploited in cascade radical cyclizations. Extension to the more complex substrate 25 afforded the core ABCE tetracyclic skeleton of the alkaloids in excellent yield and with efficient control of relative s t e r e o c h e m i s t r y .
Author Title Year Source title Reference Liu, H. M., J. Orjala, O. Sticher and T. Rali Acylated flavonol glycosides from leaves of Stenochlaena palustris 1999 Journal of Natural Products 62(1): 70-75 Abstract From the leaves of Stenochlaena palustris five new O-acylated flavonol glycosides, stenopalustrosides A-E (1-5), have been isolated along with five known compounds, kaempferol 3-O- (3"-O-E-p-coumaroyl)-(6"-O-E-feruloyl)-beta-D-glucopyranoside (6), kaempferol 3-O-(3",6"-di-O-Ep-coumaroyl)-beta-D-glucopyranoside (7), kaempferol 3-O-(3"-O-E-p-coumaroyl)-beta-Dglucopyranoside (8), kaempferol 3-O-(6"-O-E-p-coumaroyl)-beta-D-glucopyranoside(9); and kaempferol 3-O-beta-D-glucopyranoside (10). The structures of the isolates were elucidated by spectroscopic methods, mainly 1D and 2D NMR. Compounds 1-4 showed significant antibacterial activities against Gram-positive strains. The structural difference between the isolated antibacterial a n d n o n a n t i b a c t e r i a l c o m p o u n d s i s d i s c u s s e d . Author Title Year Source title Reference Martin, M. T., P. Rasoanaivo, G. Palazzino, C. Galeffi, M. Nicoletti, F. Trigalo an Minor n-b,c(21)-secocuran alkaloids of Strychnos myrtoides 1999 Phytochemistry 51(3): 479-486 Abstract From the stem bark of Strychnos myrtoides in addition to strychnobrasiline and malagashanine, four minor alkaloids, viz. malagashanol, 12-hydroxy-19-epi-malagashanine, myrtoidine and 11- demethoxymyrtoidine were isolated and their structures were established by 2-D NMR techniques. They belong to the series N-b,C(21)-secocuran and the two last show an additional alpha-beta unsaturated gamma-lactonic ring among C(18)-C(21). The biogenesis of these alkaloids is also discussed. (C) 1999 Elsevier Science Ltd. All rights reserved.
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Strychnos 1990 - 2004 - Crops for the Future

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