Tropane alkaloids from the leaves and stem bark of Erythroxylon alaternifolium and Erythroxylon rotundifolium

Abstract: A novel 3α,6β,7β-triol tropanealkaloid esterified by two benzoyl residues was isolated from the leaves of the endemic cuban species, Erythroxylonalaternifolium. Another novel 3α,6α,7β-triol tropanealkaloid esterified by trimethoxycinnamoyl and trimethoxybenzoyl residues was isolated from the leaves and stembark of a second endemic cuban species, Erythroxylonrotundifolium. Their structures were elucidated as 3α,7β-dibenzoyloxy-6β-hydroxy-tropane and 3α-(3,4,5-trimethoxy-cinnamoyloxy)-7β-(3,4,5-trimethoxybenzoyloxy)-6α-hydroxy-tropane by spectroscopic methods including 2D-NMR techniques.