Determination of the Source of the <i>N</i>-Methyl Impurity in the Synthesis of Pemetrexed Disodium Heptahydrate
作者:Douglas P. Kjell、Dallas W. Hallberg、J. Michael Kalbfleisch、Cynthia K. McCurry、Michael J. Semo、Edward M. Sheldon、Jeremy T. Spitler、Ming Wang
DOI:10.1021/op0498013
日期:2005.11.1
The synthesis of Pemetrexed Disodium Heptahydrate has consistently resulted in a very low level (ca. 0.02%) unknown impurity. To ensure long-term control, the identity and source of the impurity were desired. Isolation and characterization identified the impurity as the N-methyl derivative. The source was identified as the methyl groups on the peptide coupling agent, 2,6-Dimethoxy-1,3,5-triazine (CDMT)
培美曲塞七水合二钠的合成始终导致极低水平(约0.02%)的未知杂质。为了确保长期控制,需要杂质的身份和来源。分离和表征鉴定出该杂质为N-甲基衍生物。来源被确定为肽偶联剂2,6-二甲氧基-1,3,5-三嗪(CDMT)上的甲基。进一步的工作确保了当前条件可以提供足够的控制。