A four step enantioselective synthesis of 1S- and IR-1,2,2-trimethylcy
clopentanecarboxylic acids [(S)- and (R)-camphonanic acid, (-)-1 and (
+)-1 respectively] has been achieved from beta-cyclogeraniol, using a
Katsuki-Sharpless asymmetric epoxidation and a pinacollic rearrangemen
t as key synthetic steps.