The present invention relates to a new industrial feasible process for the preparation of Gabapentin Form-Ill by reacting 1,1-cyclohexane diacetic acid mono amide with alkali hypohalite followed by acidification with acids in presence of an organic solvent, extracting the liberated acid salt into that solvent followed by addition of an ante solvent to crystallize the Gabapentin acid salts. The separated salt is then suspending in organic solvent(s) and pH is adjusted with a base(s) at a specified temperature range, cooled to ambient temperature, followed by separation of Gabapentin Form-III, which is further converted to Gabapentin Form-II by slurrying in ethanol at specified temperature.
本发明涉及一种新的工业可行工艺,用于通过将1,1-
环己烷二
乙酸单酰胺与碱性次卤酸盐反应,随后在有机溶剂存在下用酸进行酸化,将释放的酸盐提取到该溶剂中,然后加入一种前溶剂使Gabapentin酸盐结晶。然后将分离的盐悬浮在有机溶剂中,用碱调节pH至指定温度范围,冷却至室温,然后分离Gabapentin Form-III,进一步通过在
乙醇中进行搅拌在指定温度下将其转化为Gabapentin Form-II。