Ergostan-6-one, 2,3,22,23-tetrakis(acetyloxy)-, (2a,3a,5a,22R,23R)- 、
1,2-乙二硫醇 在
三氟化硼乙醚 作用下,
以100 mg的产率得到(2S,3R,4R,5R)-2-((2R,3S,5S,8S,9S,10R,13S,14S,17R)-2,3-diacetoxy-10,13-dimethylhexadecahydrospiro[cyclopenta[a]phenanthrene-6,2'-[1,3]dithiolan]-17-yl)-5,6-dimethylheptane-3,4-diyl diacetate