Strychnos 1990 - 2004 - Crops for the Future

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Author Title Year Source title Reference Demedeiros, C. L. C., G. Thomas and R. Mukherjee The source of ca2+ for the spasmolytic actions of longicaudatine, a bisindole alkal 1991 Phytotherapy Research 5(1): 24-28 Abstract Longicaudatine, a tertiary bisindole alkaloid isolated from the root bark of Strychnos trinervis (Vell.) Mart. (Loganiaceae), antagonized in a noncompetitive manner, carbachol and histamine induced contractions of the guinea-pig ileum and bradykinin responses in the rat uterus. The respective pD2' values (mean +/- SE) were 4.61 +/- 0.21, 4.98 +/- 0.04 and 4.49 +/- 0.01. Longicaudatine, unlike verapamil, had no effect on voltage dependent Ca2+ channels, as it failed to inhibit KCl or CaCl2 induced contractions of guinea-pig ileum and depolarized rat uterus respectively. When compared with sodium nitroprusside, an antagonist of receptor operated Ca2+ channels, longicaudatine produced a slower and weaker inhibition of noradrenaline induced sustained contractions of rabbit aortic strips. However, in the aorta, the alkaloid antagonized the intracellular calcium dependent transient contractions of noradrenaline and longicaudatine (IC50, 5.01 x 10(-7) M) was approximately 133 times more potent that procaine (IC50, 6.68 x 10(-5) M), a known inhibitor of the release of Ca2+ from intracellular stores. Longicaudatine may exert nonspecific spasmolytic effects by acting on intracellular Ca2+ stores, rather than on depolarization dependent or receptor operated C a 2 + c h a n n e l s . Author Title Year Source title Reference Abstract Fevig, J. M., R. W. Marquis and L. E. Overman Synthesis applications of cationic aza-cope rearrangements .22. New approach to 1991 Journal of the American Chemical Society 113(13): 5085-5086 -
Author Title Year Source title Reference Gracia, J., J. Bonjoch, N. Casamitjana, M. Amat and J. Bosch Total synthesis of the Strychnos alkaloid tubotaiwine 1991 Journal of the Chemical Society-Chemical Communications (9): 614-615 Abstract The total synthesis of racemic tubotaiwine 8 has been achieved from the tetracyclic intermediate 1, the key steps being the construction of the C(7)-quaternary centre by cyclization of a thionium ion upon the indole 3-position and the introduction of the C(16)-methoxycarbonyl substituent by p hotochemical rearrangement of the N-methoxycarbonyleamine 7. Author Title Year Source title Reference Jhansi, P., T. P. Kalpana and C. G. K. Ramanujam Pollen analysis of rock bee summer honeys from the Prakasam district of the And 1991 Journal of Apicultural Research 30(1): 33-40 Abstract The paper deals with the pollen analysis of six squeezed honey samples collected from rock bee (Apis dorsata) combs during the period 1982-1984. All the samples represented summer honeys from tropical dry deciduous forest tracts of the Prakasam district of Andhra Pradesh, India. The samples, which were all multifloral, contained a total of 57 pollen types. The results indicate that Cassia fistula, Terminalia alata, Bauhinia racemosa, Feronia elephantum, Lagerstroemia parviflora, Strychnos potatorum, Zizyphus xylopyrus, Phyllanthus sp., Soymida febrifuga, Syzygium cumini, Dalbergia latifolia and Caesalpinia bonduc constitute fairly reliable nectar sources for honey bees in t h i s a r e a d u r i n g t h e s u m m e r . Author Title Year Source title Reference Kuehne, M. E., D. A. Frasier and T. D. Spitzer Total syntheses of tubotaiwine and 19,20-dihydro-20-epi-akuammicine 1991 Journal of Organic Chemistry 56(8): 2696-2700 Abstract Starting from the indoloazepine 9, the title products 2 and 7 were synthesized in seven steps in 27 a n d 2 2 % o v e r a l l y i e l d s , r e s p e c t i v e l y .
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