3尾,5-DIHYDROXY-5伪-STIGMASTAN-6-ONE 、
2-chloropyridin-5-ylmethylhydroxylamine 在
吡啶 、
四氯化锡 作用下,
反应 23.5h,
以72%的产率得到(3S,5R,8S,9S,10R,13R,14S,17R)-17-((2R,5R)-5-ethyl-6-methylheptan-2-yl)-3,5-dihydroxy-10,13-dimethylhexadecahydro-6H-cyclopenta[a]phenanthren-6-one O-((6-chloropyridin-3-yl)methyl) oxime