2-oxooxolan-3-yl methanesulfonate 、 6α,9α-difluoro-11β-hydroxy-21-mercapto-16α,17α-isopropylidenedioxy-pregna-1,4-diene-3,20-dione 以
N,N-二甲基甲酰胺 、 mineral oil 为溶剂,
以32%的产率得到6α,9α-difluoro-11β-hydroxy-16α,17α-isopropylidenedioxy-21-[(3S)-2-oxotetrahydrofuran-3-ylsulfanyl]pregna-1,4-diene-3,20-dione