Novel esters of 9a-fluoro- and chloro-corticosteroids of the formula
wherein Y is chlorine or OR1, R1 and R2 represent an acyl group of 2-6 carbon atoms or a benzoyl group and where R1 and R2 can be the same or different in the same molecule, R3 is methyl or fluorine in either the α- or β- orientation, X is chlorine or fluorine, and the
bond can be saturated or not, especially those compounds of the formula
wherein Y and R2 have the significance given above, are prepared by reacting the respective 9β, 11β-epoxy compounds with hydrogen fluoride or chloride.
式中 Y 是
氯或 OR1,R1 和 R2 代表 2-6 个碳原子的酰基或苯甲酰基,且 R1 和 R2 在同一分子中可以相同或不同,R3 是甲基或 α- 或 β- 方向的
氟,X 是
氯或
氟,且键可以是饱和的或非饱和的,特别是式中 Y 和 R2 具有上述意义的化合物,可通过使相应的 9β、11β-环氧化合物与
氟化氢或
氯反应制备。