A naphthoquinone and a lignan from the wood of Kigelia pinnata

A new naphthoquinone, kigelinone, and a new lignan, kigeliol, together with six known constituents including lapachol and dehydro-α- lapachone, were isolated from the wood of Kigelia pinnata. On the basis of spectral data and chemical degradations, kigelinone was characterized as 2-(1-hydroxyethyl)-8-hydroxy-naphtho[2,3-b]furano-4,9-dione and kigeliol as (2S,6S)-bis(3,4-methylenedioxyphenyl)- 3,7- dioxabicyclo[3.3.0]octan-1R,5R-diol or its enantiomer.