A procedure for converting steroids characterized by presence of an 11.beta.OH group into potent corticoids having one or more substituents, such as 6.alpha.F, 16.alpha., 17.alpha.-hydroxy or isopropylidene dioxy, 16.alpha. or 16.beta. methyl, .DELTA..sup.1,4 ; by reacting the 11.beta.-hydroxy steroid with trichloromethyl siloxane steroid, thereby rendering the normally sensitive 11 substituent inert to the series of reactions which thereafter incorporate one or more of the desired above listed substituents into the steroid molecule. The siloxy group is then hydrolyzed to regenerate the 11.beta.-hydroxy substituent. Many of the trimethyl siloxy steroids are novel compounds. The siloxane may be selectively cleaved by reaction of the finely divided steroid with 40-60% aqueous HF.
将具有11.beTA.OH基团的类
固醇转化为具有一个或多个取代基的有效皮质类
固醇的方法,例如6.alpha.F,16.alpha.,17.alpha.-羟基或异丙基二氧基,16.alpha.或16.beTA. 甲基,.DELTA..sup.1,4;通过将11.beTA.-羟基类
固醇与三
氯甲基
硅氧烷类
固醇反应,从而使通常敏感的11取代基对随后将上述所需的一个或多个取代基引入类
固醇分子的系列反应变得惰性。然后
水解
硅氧基团以再生11.beTA.-羟基取代基。许多三甲基
硅氧烷类
固醇是新颖的化合物。
硅氧烷可以通过将细粉末状类
固醇与40-60%的
氢氟酸水溶液反应来选择性地裂解。