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    • 6. 发明申请
    • METHOD FOR THE PREPARATION OF 3-DESOXY-4-ENE STEROIDS
    • 制备3-脱氧-4-烯酮甾体的方法
    • WO1990011290A1
    • 1990-10-04
    • PCT/DE1990000183
    • 1990-03-08
    • SCHERING AKTIENGESELLSCHAFTWINTERFELDT, EkkehardTILSTAMM, UlfHOFMEISTER, HelmutLAURENT, Henry
    • SCHERING AKTIENGESELLSCHAFT
    • C07J11/00
    • C07J11/00
    • The invention concerns a method for the preparation of 3-desoxy-4-ene steroids of the general formula I in which R1, R2 and R3 are a hydrogen atom or a methyl group, R4 is a lower alkyl group, a phenyl group or a free, esterified or etherified hydroxyl group, R5 is a hydrogen atom, a vinyl group or the -C=CR6 grouping, R6 being a hydrogen atom, an alkyl group with at the most 4 carbon atoms or a halogen atom, X is a methylene group, a fluoromethylene group, an ethylidene group or a vinylidene group, Y and U are a methylene group or an ethylidene group, and Z is a methylene group, an ethylidene group, a vinylidene group, a chloromethylene group or a hydroxymethylene group, and in which the bonds are three single bonds, or a double bond and two single bonds, or a conjugated double bond. The 3-oxo-4-ene steroid is reduced using a reaction mixture comprising trifluoroacetic or trichloroacetic acid, optionally additional carboxylic acid, and sodium borohydride.
    • 本发明涉及制备通式Ⅰ的3-脱氧-4-烯类固醇的方法,其中R1,R2和R3为氢原子或甲基,R4为低级烷基,苯基或 游离的,酯化的或醚化的羟基,R5是氢原子,乙烯基或-C = CR6基,R6是氢原子,具有最多4个碳原子的烷基或卤素原子,X是亚甲基 亚乙基,亚乙烯基,Y和U是亚甲基或亚乙基,Z是亚甲基,亚乙基,亚乙烯基,氯亚甲基或羟基亚甲基,和 其中键是三个单键,或双键和两个单键,或共轭双键。 使用包含三氟乙酸或三氯乙酸,任选的另外的羧酸和硼氢化钠的反应混合物还原3-氧代-4-烯类固醇。