The present invention is a novel process for the transformation of 17&agr;-hydroxy-6&agr;-methylpregn-4-ene-3,20-dione 17-acetate (I)
1
to 11&bgr;,17&agr;,21-trihydroxy-6&agr;-methylpregna-1,4-diene-3,20-dione 21-acetate (VI)
2
本发明是一种新型的方法,用于将17α-羟基-6α-甲基孕-4-烯-3,20-二酮-17-
乙酸酯(I)转化为11β,17α,21-三羟基-6α-甲基孕-1,4-二烯-3,20-二酮-21-乙酸酯(VI)2。