Abstract
Ten new diarylheptanoids (
2, 3, 4, 5a-d, 6, 7
, and
8
) have been isolated from an extract of
Ottelia alismoides
. The structures of these previously unknown metabolites were determined by NMR spectroscopic analysis. A previously unknown, hydroxylated analog of the known otteliones A and B (
1a
and
1b
)–namely, 3a-hydroxyottelione (
13
)–was also isolated. The
1
H NMR analysis of the Mosher esters of alcohols derived from otteliones A and B (
S-17/R-17
and
S-20/R-20
) are also reported.