摘要:
The stereoselective synthesis of a delta-lactone, (22R)-3-beta-acetoxy-22-hydroxylanosta-8,24(31)-dien-32-oic acid (X), which is the first lanostane analog of the sex hormone of Achlya aqueous fungi, was carried out by means of 1,3-dipolar addition of nitrile oxides to lanostane olefin (I) through (22R)-isoxazoline (III) as a key intermediate.