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    • 3. 发明授权
    • Preparation of 16.alpha.-methyl steroids
    • 制备16种α-甲基类固醇
    • US5508452A
    • 1996-04-16
    • US180454
    • 1994-01-12
    • Patrick RousselMichel Vivat
    • Patrick RousselMichel Vivat
    • C07B61/00C07J5/00C07J7/00C07J71/00C07J75/00C07J1/00
    • C07J71/0015C07J5/0076
    • A process for the preparation of a compound of the formula ##STR1## in which rings A and B are a remainder: ##STR2## in which the 3-ketone function is optionally protected in the form of a ketal, thioketal, hemithioketal or enol ether, or a remainder: ##STR3## wherein R is methyl or --CH.sub.2 --OR', R' is hydrogen or ether remainder or ester remainder, R.sub.1 and R.sub.2 together form a second bond, or R.sub.1 and R.sub.2 form together an epoxide in beta position, or R.sub.1 is hydrogen, ketone or .alpha.- or .beta.- hydroxy, free or protected in the form of an ether or ester and R.sub.2 is hydrogen, or R.sub.1 is hydrogen and R.sub.2 is .alpha.-hydroxy function, or R.sub.1 is .beta.-hydroxy, free or protected in the form of an ether or ester and R.sub.2 is .alpha.-fluorine or bromine and R.sub.3 is hydrogen or .alpha. or .beta. fluorine or methyl comprising reacting a compound of the formula ##STR4## in which A, B, R, R.sub.1, R.sub.2 and R.sub.3 have the above meaning with a methylation agent in the presence of a copper-based catalyst to form the 16 .alpha.-methylated enolate, hydrolyzing the latter to obtain the corresponding enol and reacting the latter with an oxidizing agent to obtain the compound of formula I.
    • 制备其中环A和B为其余环的其中环A和B的化合物的方法:其中3-酮官能团任选以缩酮形式,硫代缩酮, 半硫酮缩酮或烯醇醚,或其余:其中R为甲基或-CH2-OR',R'为氢或醚余量或酯残基,R1和R2一起形成第二个键,或R 1和R 2 形成β位的环氧化物,或R1是氢,酮或α-或β-羟基,以醚或酯的形式游离或保护,R2为氢,或R1为氢,R2为α-羟基官能团, 或R 1为β-羟基,游离或保护为醚或酯形式,R 2为α-氟或溴,R 3为氢或α或β氟或甲基,包括使下式化合物II 在铜基催化剂存在下,A,B,R,R 1,R 2和R 3与甲基化剂具有上述含义,形成16 α-甲基化烯醇化物,水解后者以获得相应的烯醇并使其与氧化剂反应,得到式I化合物。