rac-(18Ξ)-3,3-ethanediyldioxy-11β,18-epoxy-18-((Ξ)-tetrahydropyran-2-yloxy)-androsta-5,14-dien-16-one 在
吡啶 、
苯 作用下,
生成
rac-(18Ξ)-20-acetoxy-3,3-ethanediyldioxy-11β,18-epoxy-16-oxo-18-((Ξ)-tetrahydropyran-2-yloxy)-pregna-5,14,17(20)ξ-trien-21-oic acid methyl ester