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    • 8. 发明授权
    • Method for the preparation of citalopram
    • 西酞普兰制备方法
    • US06365747B1
    • 2002-04-02
    • US09830109
    • 2001-06-01
    • Leone Dall'AstaUmberto CasazzaHans Petersen
    • Leone Dall'AstaUmberto CasazzaHans Petersen
    • C07D30787
    • C07D307/87C07D263/14C07D413/04
    • The present invention relates to a method for the preparation of citalopram or any of its enantiomers and acid addition salts thereof comprising treatment of a compound of formula (IV), wherein X is O or S; R1-R2 are each independently selected from hydrogen and C1-6 alkyl, or R1 and R2 together form a C2-5 alkylene chain thereby forming a spiro-ring; R3 is selected from hydrogen and C1-6 alkyl, R4 is selected from hydrogen, C1-6 alkyl, a carboxy group or a precursor group therefore, or R3 and R4 together form a C2-5 alkylene chain thereby forming a spiro-ring, with a dehydration agent or alternatively where X is S, thermally cleavage of the thiazoline ring, or treatment in presence of a radical initiator, to form citalopram. The invention also relates to intermediates used in the new process for the preparation of citalopram, as well as citalopram prepared according to the new process.
    • 本发明涉及一种制备西酞普兰或其任何对映异构体及其酸加成盐的方法,包括处理式(IV)化合物,其中X为O或S; R 1 -R 2各自独立地选自氢和C 1-6烷基,或者R 1和R 2一起形成C 2-5亚烷基链,从而形成螺环; R3选自氢和C 1-6烷基,因此R4选自氢,C 1-6烷基,羧基或前体基,或者R 3和R 4一起形成C 2-5亚烷基链,从而形成螺环, 用脱水剂或者其中X是S,噻唑啉环的热裂解,或在自由基引发剂的存在下进行处理以形成西酞普兰。 本发明还涉及用于制备西酞普兰的新方法的中间体以及根据新方法制备的西酞普兰。
    • 9. 发明授权
    • Process for the preparation of amikacin precursors
    • 制备阿米卡星前体的方法
    • US5621085A
    • 1997-04-15
    • US459649
    • 1995-06-02
    • Leone Dall'AstaEugenio Garegnani
    • Leone Dall'AstaEugenio Garegnani
    • C07H15/234C07H15/236C07H15/26C07H1/00
    • C07H15/26C07H15/234Y02P20/55
    • Process for the preparation of a 3,6'-di-N-Acyl-1-[L-(-)-4-Acylamino-2-hydroxybutyryl] kanamycin A, wherein Acyl is a N-protecting acylating group, which comprises reacting kanamycin A with an aluminum salt in an inert organic solvent, treating the aluminum complex thus obtained with a N-acylating agent and acidifiying the reaction mixture, as such or after having removed the complexing aluminum in basic medium and isolated the 3,6'-di-N-Acyl-kanamycin A, to pH 6, treating the protonated 3,6'-di-N-Acyl-kanamycin A, in form of a salt thereof, with an active derivative of L-(-)-4-Acyl-amino-2-hydroxybutyric acid, wherein Acyl is a N-protecting group preferably identical with that which protects the amino groups in the positions 3 and 6' of kanamycin A, and isolating the product thus obtained by simple correction of the pH.
    • 制备3,6'-二-N-酰基-1- [L - ( - ) - 4-酰基氨基-2-羟基丁酰基]卡那霉素A的方法,其中酰基是N-保护性酰化基团,其包括使 卡那霉素A与铝盐在惰性有机溶剂中反应,用N-酰化剂处理由此获得的铝络合物,并酸化反应混合物,或者在除去碱性介质中的络合铝并分离出3,6'- 将二-N-酰基卡那霉素A转化至pH6,用其盐形式的质子化的3,6'-二-N-酰基卡那霉素A与活性衍生物L - ( - ) - 酰基 - 氨基-2-羟基丁酸,其中酰基是N-保护基,优选与保护卡那霉素A的3'和6'位氨基的那些相同,并通过简单校正pH分离由此获得的产物。