申请人:Jobdevairakkam Christopher N.
公开号:US20090187018A1
公开(公告)日:2009-07-23
The present invention provides an improved process of preparing hydralazine hydrochloride, which involves the preparation of 1-chlorophthalazine salt and further reacting with hydrazine followed by purification of hydralazine hydrochloride, which is free of phosphate, does not contain any individual impurities more than 0.05%, total impurities less than 0.5%, and a hydrazine content of not more than 0.001 %, and preferably less than 0.0003%. One benefit of improved purity is enhanced storage stability.
本发明提供了一种改进的制备盐酸酰唑啉的方法,该方法涉及制备1-氯酞嗪盐,并进一步与肼反应,随后纯化酰唑啉盐酸盐,其不含磷酸盐,不含任何单个杂质超过0.05%,总杂质少于0.5%,肼含量不超过0.001%,且最好低于0.0003%。改进纯度的一个好处是增强了储存稳定性。