Nortropane Alkaloids from the leaves of erythoxylum moonii

摘要

Four new nortropane alkaloids have been isolated from the leaves of Erythroxylum moonii and identified as nortropane-3alpha-6beta-7beta-triol 3-benzoate-7-(2'-hydroxy-3'-phenylpropanoate) (1), nortropane-3alpha-7beta-diol 7-trans-cinnnamate 3-propanoate (2), nortropane-3alpha-7beta-diol 7-benzene 3-(2'-methylpropanoate) (3), and nortropane-3alpha-7beta-diol 3-(2'-methylpropanoate) 7-cis-(3",4",5"-trimetoxycinnamate) (4). Additionally, five known bases are characterized as tropane-3alpha-7beta-diol 7-benzoate (5), tropane-3alpha-7beta-triol 3-benzoate (8), and tropane-3alpha-yl 3-(3',4',5'-trimethoxybenzoate) (9). The structures for the compounds are proposed on the basis of spectroscopic evidences.