Novel steroids having a 9.alpha.-hydroxy or a 9.alpha.-carbonate substituent can be prepared from 9.alpha.-hydroxyandrostenedione and can be utilized in the synthesis of commercially valuable corticosteroids such as betamethasone. The 9.alpha.-carbonates are prepared by reaction of the corresponding 9.alpha.-hydroxy steroid with a sequence of excess base, trialkylsilyl chloride, alkyl haloformate and alkanol or by using excess base, alkyl haloformate and alkoxide. 9.alpha.-Carbonate-17-keto compounds can be treated with lithium acetylide and a lithium salt to afford the corresponding 17.alpha.-ethynyl-17.beta.-hydroxy-9.alpha.-carbonate. This compound is then esterified with a novel series of reagents to give the 17-ester which can be reduced the corresponding 17-allene. Oxidation of this allene to the bis-epoxide compound, followed by treatment with an alkali metal salt of a carboxylic acid under phase transfer conditions gives the 17.alpha.-hydroxy 21-ester 9.alpha.-carbonate. Elimination of the 9.alpha.-carbonate group affords the a 17.alpha.-hydroxy, 9(11)ene, which in a few subsequent steps can be converted to a variety of commercially important corticosteroids. Novel 9.alpha.-carbonate compounds are prepared in the various reaction steps.
新型类
固醇具有9.alpha.-羟基或9.alpha.-
碳酸酯取代基,可以从9.alpha.-羟基
雄烯二酮中制备,并可用于合成商业上有价值的皮质类
固醇,如
倍他米松。9.alpha.-
碳酸酯可通过相应的9.alpha.-羟基类
固醇与过量碱、三烷基
氯硅烷、烷基卤酸酯和烷醇的反应序列,或者通过使用过量碱、烷基卤酸酯和碱性氧化物来制备。9.alpha.-
碳酸酯-17-酮化合物可与
锂乙炔和
锂盐反应,以得到相应的17.alpha.-
乙炔基-17.beta.-羟基-9.alpha.-
碳酸酯。然后,将这种化合物与新型系列试剂酯化,得到17-酯,可以还原为相应的17-烯基。将这种烯基氧化为双环氧化合物,然后在相转移条件下用
羧酸的碱
金属盐处理,得到17.alpha.-羟基21-酯9.alpha.-
碳酸酯。消除9.alpha.-
碳酸酯基团得到17.alpha.-羟基,9(11)烯,经过几个步骤可转化为各种商业重要的皮质类
固醇。在各种反应步骤中制备新型9.alpha.-
碳酸酯化合物。