Strychnos 1990 - 2004 - Crops for the Future

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Author Title Year Source title Reference Abstract Jeyaraj, T., S. Deepa and A. C. Hary Water quality improvement using Strychnos potatorum nuts 1998 Indian Journal of Environmental Protection 18(3): 211-214 - Author Title Year Source title Reference Abstract Kuehne, M. E., U. K. Bandarage, A. Hammach, Y. L. Li and T. Wang Application of ferrocenylalkyl chiral auxiliaries to syntheses of indolenine alkaloi 1998 Journal of Organic Chemistry 63(7): 2172-2183 - Author Title Year Source title Reference Abstract Liu, X. and W. Li Chemical constituents from maqianzi (Sstrychnos nux vomica) 1998 Chinese Traditional and Herbal Drugs 29(7): 435-437 -
Author Title Year Source title Reference Abstract Miao, P., D. C. Cai, B. R. Xiang, D. K. An and Y. Ito Separation and purification of strychnine from crude extract of Strychnos nux-vo 1998 Journal of Liquid Chromatography and Related Technologies 21(1/2): 163-170 - Author Title Year Source title Reference Padwa, A. and A. T. Price Synthesis of the pentacyclic skeleton of the aspidosperma alkaloids using rhodium 1998 Journal of Organic Chemistry 63(3): 556-565 Abstract A series of diazo amido keto esters prepared from N-alkenyl-substituted 3-carbalkoxy-2-piperidone derivatives was treated with rhodium(II) acetate. Attack of the amido carbonyl oxygen at the resultant rhodium carbenoid center produced a transient push-pull carbonyl ylide dipole which underwent an intramolecular dipolar cycloaddition reaction. A related annulation sequence was used to prepare the pentacyclic skeleton of the aspidosperma family of alkaloids. Synthesis of the required diazo imide was carried out from 3-carboxy-3-ethyl-2-piperidone and N-methyl-3-indoleacetic acid. Treatment of the diazo imide with rhodium(II) acetate afforded a transient 1,3-dipole which subsequently underwent cycloaddition across the indole pi-bond. The resulting cycloadduct is the consequence of endo cycloaddition with respect to the dipole which is fully in accord with the lowest energy transition state. The cycloadduct was converted in three steps into desacetoxy-4-oxo- 6,7-dihydrovindorosine. The stereochemistry of the final product was established by a X-ray c r y s t a l l o g r a p h i c s t u d y . Author Title Year Source title Reference Abstract Shibasaki, M., A. Kojima and S. Shimizu Catalytic asymmetric synthesis of natural products with heterocyclic rings 1998 Journal of Heterocyclic Chemistry 35(5): 1057-1064 -
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Strychnos 1990 - 2004 - Crops for the Future

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