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    • 8. 发明授权
    • Process for preparing piperazine-substituted aliphatic carboxylates
    • 制备哌嗪取代的脂肪族羧酸盐的方法
    • US06239277B1
    • 2001-05-29
    • US09421514
    • 1999-10-20
    • Pedro E. HernandezDavid John FairfaxErik T. Michalson
    • Pedro E. HernandezDavid John FairfaxErik T. Michalson
    • C07D29510
    • C07D295/088
    • A process is disclosed for the preparation of a piperazine-substituted aliphatic carboxylate having the formula where m and n are individually an integer of from 1 to 6, R and R′ are the same or different and are hydrogen, C1 to C6 alkyl or aryl or heteroaryl that is unsubstituted or is substituted with at least one substituent that is halo, C1 to C6 alkyl or C1 to C6 alkoxy and R″ is C3 to C12 branched alkyl or an organic or inorganic cation. The process comprises treating a solution comprising a compound of the formula wherein m, R and R′ are as defined above and an aliphatic ester of the formula X—(CH2)n—O—CH2—CO(O)R″ where X is a leaving group and n and R″ are as defined above, with an effective amount of a base for a time and at a temperature sufficient to form a piperazine-substituted aliphatic carboxylate. Hydrolysis of the carboxylate with acid produces a piperazine-substituted aliphatic carboxylic acid or the acid salt thereof.
    • 公开了制备具有式m和n分别为1至6的整数的哌嗪取代的脂族羧酸酯的方法,R和R'相同或不同,为氢,C 1至C 6烷基或芳基或 未被取代或被至少一个为卤素,C 1至C 6烷基或C 1至C 6烷氧基的取代基取代的杂芳基,R“为C 3至C 12支链烷基或有机或无机阳离子。 该方法包括处理包含糠醛的化合物的溶液,R和R'如上所定义,并且所述式的脂族酯是离去基团,n和R“如上定义,并且有效量 碱处理一段时间并在足以形成哌嗪取代的脂族羧酸酯的温度下进行。 羧酸酯与酸的水解产生哌嗪取代的脂族羧酸或其酸式盐。