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    • 3. 发明公开
    • PROCESS FOR THE PREPARATION OF 3-OXIMINO STEROIDS
    • 工艺制备3-肟类固醇
    • EP1778716A1
    • 2007-05-02
    • EP05788984.2
    • 2005-08-12
    • Sicor Inc.
    • VILLA, MarcoFRETTA, RobertaDIULGHEROFF, Nicola
    • C07J41/00
    • C07J41/00C07J41/0016
    • The present invention provides a method of preparing norelgestromin or norgestimate by reacting the corresponding 3-oxosteroid precursor with hydroxylamine HCl and a base to obtain a reaction mixture forming norelgestromin or norgestimate; monitoring the anti/syn ratio of the norelgestromin or norgestimate produced in the reaction mixture; adding a base to the reaction mixture to neutralize acidity in the reaction mixture when a desired anti/syn ratio is detected; and isolating the norelgestromin or norgestimate. The present invention also provides a process allowing a control of the formation of the anti isomer and syn isomer of norelgestromin or norgestimate by reacting the corresponding 3-oxosteroid precursor with hydroxylamine HCl and a base to obtain a reaction mixture forming norelgestromin or norgestimate; regulating the acidity of the reaction mixture to adjust the anti/syn ratio of the norelgestromin or norgestimate produced in the reaction mixture; adding a base to the reaction mixture to neutralize acidity in the reaction mixture when a desired anti/syn ratio is detected; and isolating the norelgestromin or norgestimate.