(22R,23R,24S)-22,23-isopropylidenedioxy-B-homo-6-oxa-5α-stigmast-3-en-7-one 在
四氧化锇 、
sodium hydrogensulfite 、
N-甲基吗啉氧化物 作用下,
生成 (1R,3aS,3bS,6aR,7R,8R,10aR,10bS,12aS)-1-{(S)-1-[(4R,5R)-5-((S)-1-Ethyl-2-methyl-propyl)-2,2-dimethyl-[1,3]dioxolan-4-yl]-ethyl}-7,8-dihydroxy-10a,12a-dimethyl-hexadecahydro-6-oxa-benzo[3,4]cyclohepta[1,2-e]inden-5-one