Abstract
Conoliferine and isoconoliferine were isolated from Tabernaemontana corymbosa as an unresolvable mixture of (1′ S, 2′ S)- and (1′ R, 2′ R)-diastereomers. These novel natural products are constituted from the union of an iboga alkaloid, ibogaine, and a lignan moiety, and represent the first instance of such an alkaloid-lignan conjugate. The structure was determined by spectroscopic methods, including the extensive use of NOE experiments for assignment of stereochemistry.
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