open-ring amide]. Each (2, 3, 4 and 5) is an observed process-related impurity with a possible significant impact on the quality of the drug product. This work is useful for generic pharmaceutical industry for making impurity reference standards. Pharmacopeia is not available for bilastine; hence, the control of these impurities in the API below the threshold level is essential as per International
Bilastine 是一种新的、耐受性良好、无镇静作用的 H1 受体
抗组胺药。在此,我们描述了
比拉斯汀的四种新的潜在杂质的合成,即 2-[4-(2-(4-(1-(2-甲氧基乙基)
苯并咪唑-2-基)
哌啶-1-基)乙基)苯基] -2-甲基
丙酸 ( 2 ) (甲氧基乙基
比拉斯汀), 2-[4-(2-(4-(1-(2-(2-乙氧基乙氧基)乙基)
苯并咪唑-2-基)
哌啶-1-基)乙基)苯基]-2-甲基
丙酸( 3 )((2-乙氧基乙氧基)乙基
比拉斯汀),2-
氨基-2-甲基丙基2-[4-(2-(4-(1-(
2-乙氧基乙基)
苯并咪唑-) 2-基)
哌啶-1-基)乙基)苯基]-2-甲基
丙酸酯(4) (
比拉斯汀的 2-
氨基-2-甲基
丙酯或
比拉斯汀开环酯) 和 2-[4-(2-(4-(1-(
2-乙氧基乙基)
苯并咪唑-2-基]
哌啶-1-基) ) 乙基) 苯基]-N-(1-hydroxy-2-methylpropan-