Generation of 1-azabicyclo[3.2.1]octane and 5-azatricyclo[3.2.1.02,7]octane systems by carbenium ion rearrangements during production of the antihistamine drug Quifenadine
作者:Mikus Puriņš、Viktors Kumpiņš、Mikhail Skomorokhov、Anatoly Mishnev、Māris Turks
DOI:10.1016/j.tetlet.2019.151405
日期:2020.1
Dehydration of ethyl 3-hydroxyquinuclidine-3-carboxylate is one of the key steps during production of the antihistamine drug Quifenadine (Phencarol). The side products of this process were isolated and their structures proved using NMR spectroscopy. Carbenium ion rearrangements of quinuclidine-3-carboxylate gave rise to 1-azabicyclo[3.2.1]octane and 5-azatricyclo[3.2.1.02,7]octane systems, which serve
3-羟基喹核苷-3-羧酸乙酯的脱水是抗组胺药Quifenadine(Phencarol)生产过程中的关键步骤之一。分离了该方法的副产物,并使用NMR光谱法证实了其结构。奎宁环丁3-羧酸盐的碳离子重排产生了1-氮杂双环[3.2.1]辛烷和5-氮杂三环[3.2.1.0 2,7 ]辛烷体系,它们是奎非那定制造工艺中的杂质标准,也是药用化学的有趣构建基块。