Two syntheses are described to confirm the structure 15 proposed for n
imbinone. The first,which leads to racemic O-methyl nimbinone[14], inv
olves the polycyclization of a geraniol-derived intermediate 7. This s
ame intermediate also afforded another preparation of (+/-)-methyl nim
biol [12]. The other synthesis starts from natural podocarpic acid and
affords optically active O-methyl nimbinone [14].