The regio- and stereoselective hydroxylation of variously substituted
asymmetric 4a-methyl octalenones by selected fungal strains has been s
hown to afford, sometimes in high yields, several optically pure deriv
atives, generally hydroxylated in the B-ring. The potential of this me
thod for the preparation of functionalized (hydroxylated) chiral synth
ons is evaluated and discussed.