3,12-di-O-acetyl-20-O-(2,3,4,6-tetra-O-acetyl-β-D-glucopyranosyl)dammar-24-ene-3β,12β,20(S)-triol 在
四氧化锇 作用下,
以
吡啶 为溶剂,
反应 2.0h,
以93%的产率得到acetic acid 3-acetoxy-17-[4,5-dihydroxy-1,5-dimethyl-1-(3,4,5-triacetoxy-6-acetoxymethyl-tetrahydro-pyran-2-yloxy)-hexyl]-4,4,8,10,14-pentamethyl-hexadecahydro-cyclopenta[a]phenanthren-12-yl ester