Tropane alkaloids from Erythroxylum zeylanicum O.E. Schulz (Erythroxylaceae) |
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| Authors: | Bringmann G Günther C Mühlbacher J Lalith M D Gunathilake P Wickramasinghe A |
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| Affiliation: | Institut für Organische Chemie der Universit?t, Würzburg, Germany. bringman@chemie.uni-wuerzburg.de |
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| Abstract: | Six tropane alkaloids were isolated from the Sri Lankan endemic plant Erythroxylum zeylanicum O.E. Schulz (Erythroxylaceae) and structurally elucidated by NMR and MS measurements. Three of them, erythrozeylanines A [1R,3R,5S,6R-6-acetoxy-3-(3',4',5'-trimethoxybenzoyloxy)tropane], B [cis-3 beta-(cinnamoyloxy)tropane], and C [cis-6 beta-acetoxy-3 alpha-(cinnamoyloxy)tropane] are new, whereas the others have already been found in other Erythroxylum species. For the first time, the absolute configuration of a tropane alkaloid (erythrozeylanine A) has been determined by quantum chemical CD calculations. |
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