[EN] PROCESS FOR THE PREPARATION OF GABAPENTIN<br/>[FR] PROCEDE DE PREPARATION DE GABAPENTINE
申请人:SHASUN CHEMICALS AND DRUGS LTD
公开号:WO2004101489A1
公开(公告)日:2004-11-25
The present invention relates to the process for the preparation of anhydrous Gabapentin of pharmaceutical grade from the Gabapentin acid addition salts. The process consists of neutralizing the said acid addition salts with an organic base in water to get an aqueous solution comprising of Gabapentin and amine acid addition salt dissolved in water. The process further comprises of a method to separate the Gabapentin and the amine acid addition salt from such an aqueous solution and to recover Gabapentin as an anhydrous Gabapentin form II.
The invention relates to a method of obtaining substantially-salt-free cyclic amino acids having formula (I),
where n is a whole number selected from 2, 3 and 4,
and, in particular, gabapentin (compound having formula (I) with n=3), with a high degree of purity. The inventive method comprises a step involving the electrolysis of a solution containing an addition salt of the cyclic amino acid with a mineral acid, which serves to eliminate the anion from the mineral acid for concentrations of no more than 3 ppm.
The present invention relates to the process for the preparation of anhydrous Gabapentin of pharmaceutical grade from the Gabapentin acid addition salts. The process consists of neutralizing the said acid addition salts with an organic base in water to get an aqueous solution comprising of Gabapentin and amine acid addition salt dissolved in water. The process further comprises of a method to separate the Gabapentin and the amine acid addition salt from such an aqueous solution and to recover Gabapentin as an anhydrous Gabapentin form II.