Strychnos 1990 - 2004 - Crops for the Future

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Author Title Year Source title Reference Ishibashi, H. and M. Ikeda Recent progress in electrophilic aromatic substitution with alpha-thiocarbocations 1996 Reviews on Heteroatom Chemistry 14: 59-82 Abstract This review summarizes the recent work on electrophilic aromatic substitution with alphathiocarbocations. Emphasis has been made on the structural modification and variation of the reaction conditions of alpha-chlorosulfides or sulfoxides to accomplish the reactions. The literature from 1991 to January 1996 are covered in this review. Author Title Year Source title Reference Kuehne, M. E., T. S. Wang and D. Seraphin Syntheses of strychnos and aspidospermatan-type alkaloids .8. Selective total synt 1996 Journal of Organic Chemistry 61(22): 7873-7881 Abstract Mossambine (6) was obtained by a six-step reaction sequence from the indoloazepine ester 7. Radical cyclization of the tetracyclic vinyl iodide 12a provided a racemic pentacyclic ketone 16E, which could be converted to either enantiomer by condensation with (S or R)-N,S-dimethyl-Sphenylsulfoximine and selective pyrolysis of the resulting diastereomeric alcohols 18 and 19 or 20 and 21. Selective reductions of the resolved (or racemic) ketone 16E provided mossambine (6) and i t s h y d r o x y e p i m e r 1 7 . Author Title Year Source title Reference Abstract Martin, S. F., C. W. Clark, M. Ito and M. Mortimore A biomimetic approach to the Strychnos alkaloids. A novel, concise synthesis of ( 1996 Journal of the American Chemical Society 118(40): 9804-9805 -
Author Title Year Source title Reference Abstract Mavar-Manga, H., J. Quetin-Leclercq, G. Llabres, M. L. Belem-Pinheiro, A. F. Im 9-methoxygeissoschizol, an alkaloid from bark of Strychnos guianensis 1996 Phytochemistry 43(5): 1125-1127 - Author Title Year Source title Reference Mukaiyama, T., I. Shiina, H. Iwadare, M. Saitoh, K. Nishimura, T. Nishimura, N. An asymmetric synthesis of the bc ring system of 8-epitaxoids by way of intramol 1996 Chemistry Letters (6): 483-484 Abstract Optically active 1 alpha-allyl-1 beta,11 beta-benzylidenedioxy-2 alpha,10 beta-bis(benzyloxy)-7 beta,9 beta-isopropylidenedioxy-8 alpha,12,12-trimethyl-4-methylenebicyclo[6.4.0]dodecane (2)(1) which corresponds to BC ring system of 8-epitaxoids was prepared in high yield from ketoaldehyde 8 via intramolecular aldol cyclization and successive stereoselective methylation reactions. The ketoaldehyde 8 was synthesized from 8-membered ring compound 3 by stereoselective Michael a d d i t i o n u s i n g h i g h e r - o r d e r c u p r a t e . Author Title Year Source title Reference Abstract Nuzillard, J. M., P. Thepenier, M. J. Jacquier, G. Massiot, L. Le Men-Olivier and Alkaloids from root bark of Strychnos panganensis 1996 Phytochemistry 43(4): 897-902 -
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