(2E,4E)-(8R,9R,11R,12R)-8,9,11,12-Tetrahydroxy-3-methyl-7,10-dimethylene-pentadeca-2,4,14-trienoic acid (1R,2S)-2-methyl-1-[(2S,3R)-3-((R)-1-methyl-butyl)-oxiranyl]-pent-4-ynyl ester 在
cyclopentadienylruthenium(II) trisacetonitrile hexafluorophosphate 作用下,
以21%的产率得到(3E,5E,14E)-(9R,10R,12R,13R,19S,20R)-9,10,12,13-Tetrahydroxy-4,19-dimethyl-20-[(2S,3R)-3-((R)-1-methyl-butyl)-oxiranyl]-8,11,17-trimethylene-oxacycloicosa-3,5,14-trien-2-one