A very useful synthesis of (3S)-2,3-oxidosqualene from geraniol, farne
sol and E-1-bromo-4-chloro-3-methyl-2-butene is described which makes
use of enantioselective and catalytic dihydroxylation of geranyl aceta
te and two E-stereospecific allylic coupling reactions mediated by E-p
renylbarium reagents.