Strychnos 1990 - 2004 - Crops for the Future

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Author Title Year Source title Reference Abstract Arend, M., B. Westermann and N. Risch Modern variants of the mannich reaction 1998 Angewandte Chemie-International Edition 37(8): 1045-1070 - Author Title Year Source title Reference Biala, R. G., M. Tits, J. Penelle, M. Frederich, V. Brandt, C. Prosperi, G. Llabres Strychnochrysine, a new bisindole alkaloid from the roots of Strychnos nux vomic 1998 Journal of Natural Products 61(1): 139-141 Abstract The reinvestigation of Strychnos nux-vomica resulted in the isolation of a colored monoquaternary bisindole alkaloid from the roots. The structure of this new orange substance, strychnochrysine (1), was defined by detailed spectroscopic methods. Author Title Year Source title Reference Birman VB; Rawal VH A novel route to the geissoschizine skeleton: The influence of ligands on the diast 1998 Tetrahedron Letters 39(40): 7219-7222 Abstract A concise, novel route to the geissoschizine skeleton has been developed. The key step involves a Heck cyclization reaction, which was found to lead to opposite diastereomers, (+/-)-8 or (+/-)-9, depending on the reaction conditions. (C) 1998 Elsevier Science Ltd. All rights reserved.
Author Title Year Source title Reference Bonjoch, J., J. C. Fernandez and N. Valls Total syntheses of (+/-)-deethylibophyllidine using a crisscross annulation: Ring c 1998 Journal of Organic Chemistry 63(21): 7338-7347 Abstract The total synthesis of (+/-)-deethylibophyllidine (1) is described. Three different sequences provide this pentacyclic alkaloid using a common strategy involving a crisscross annulation. Key steps include (i) C/D ring cleavage of a 2-formyloctahydroindolo[2,3-a]quinolizine to obtain octahydroazecino[5,4-b]indoles, via either a chloroformate induced process or a quaternary ammonium salt formation followed by treatment with lithium, and (ii) a tandem process consisting of an intramolecular Pictet-Spengler double cyclization upon a beta-indole position of a 2,3- disubstituted indole to generate the quaternary spiro center of the pentacyclic skeleton of ibophyllidine alkaloids. Attempts to extend the procedure to the construction of the pentacyclic framework of (+/-)ibophyllidine result in very low yield. Author Title Year Source title Reference Abstract Cai, B. C., T. S. Wang, M. Kurokawa, K. Shiraki and M. Hattori Cytotoxicities of alkaloids from processed and unprocessed seeds of Strychnos nu 1998 Acta Pharmacologica Sinica 19(5): 425-428 - Author Title Year Source title Reference Abstract Chen, X. and et al. Influence of processing methods on alkaloid, toxicity and effect of Strychnos nux 1998 China Journal of Chinese Materia Medica 23(3): 151-153 -
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