Stereocontrolled functionalization of cycloheptadiene using organometallic chemistry: synthesis of the (+)-Prelog-Djerassi lactone and a tylosin subunit
cis-3,7-diacetoxy-4,6-dimethylcycloheptene (5), which was subjected to asymmetric enzymatic hydrolysis to give hydroxy acetate (6), and this compound was converted in four steps to the (+)-Prelog–Djerassilactone having high optical purity.