Stereospecific synthesis of 1,5-disubstituted tetrazoles from ketoximes via a Beckmann rearrangement facilitated by diphenyl phosphorazidate
作者:Kotaro Ishihara、Takayuki Shioiri、Masato Matsugi
DOI:10.1016/j.tetlet.2019.04.014
日期:2019.5
A novel method for the stereospecific synthesis of 1,5-disubstituted tetrazoles from ketoximes via the Beckmann rearrangement was developed using diphenyl phosphorazidate (DPPA) as both the oxime activator and azide source. Various ketoximes were transformed into the corresponding 1,5-disubstituted tetrazoles with exclusive trans-group migration and no E-Z isomerization of the ketoxime. This method
开发了一种新的方法,该方法通过使用贝克曼重排从酮肟中立体异构合成1,5-二取代的四唑,同时使用了叠氮基磷酸二苯酯(DPPA)作为肟的活化剂和叠氮化物的来源。具有排他性的跨基团迁移并且没有酮肟的EZ异构化,将各种酮肟转化为相应的1,5-二取代的四唑。该方法无需使用有毒或易爆的叠氮化试剂即可制备1,5-二取代的四唑。