Abstract
| - An enantioseletive synthesis of the novel anti-asthma agent IRL576,092 (2) is described. The syntheticroute developed involves stereoselective 1,2-reduction of theenone carbonyl functionality of 6 and subsequent hydroboration as the key steps. Starting from the commerciallyavailable 5-androsten-3β-ol-17-one 3, this approach affordsIPL576,092 (2) in nine steps with overall yields of 25%,employing a limited number of chromatographic steps.
|