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    • 7. 发明授权
    • Process for preparing the d-threo isomer of methylphenidate hydrochloride
    • 制备哌甲酯盐酸盐的d-苏式异构体的方法
    • US6162919A
    • 2000-12-19
    • US204460
    • 1998-12-03
    • Mahavir PrashadBin Hu
    • Mahavir PrashadBin Hu
    • C07D211/34C07D211/32
    • C07D211/34
    • A process for preparing the d-threo isomer of methylphenidate hydrochloride comprising converting d,l-threo methylphenidate hydrochloride to the free base form in a first step, resolving the free base prepared in the first step with (R)-(-)-1,1'-binaphthyl-2,2'-diyl hydrogen phosphate to obtain the phosphate salt enriched with the d-threo isomer of methylphenidate in a second step, basifying the phosphate salt to obtain the free base form of the d-threo isomer of methylphenidate in a third step, converting the free base to the hydrochloride salt form of the d-threo isomer of methylphenidate in high optical purity in a fourth step, and recrystallizing the hydrochloride salt form to obtain the desired d-threo isomer in a higher optical purity. An alternative embodiment relates to the preparation of the d-threo isomer of methylphenidate hydrochloride utilizing the hydrochloride salt form of the racemic mixture of threo-methylphenidate directly.
    • 一种制备哌甲酯盐酸盐的+ E,未d + EE-同位素异构体的方法,包括在第一步中将+ E,uns d,l + EE-所述哌甲酯盐酸盐转化为游离碱形式, (R) - ( - ) - 1,1'-联萘-2,2'-二基磷酸氢盐的第一步,以获得在第二步中富含哌甲酯的+ E,未d + EE-异构体的磷酸盐 在第三步中碱化磷酸盐以获得哌甲酯的+ E,未d + EE-苏氨酸异构体的游离碱形式,将游离碱转化为+ E,非d + EE-th的盐酸盐形式 在第四步中高哌嗪类异构体的高光学纯度,并重结晶盐酸盐形式,以获得更高的光学纯度的所需的+ E,非d + EE-苏式异构体。 替代实施方案涉及直接用盐酸盐形式的苏氨哌甲酸酯的外消旋混合物制备哌甲酯盐酸盐的+ E,未d + EE-苏氨酸异构体。