Synthesis of substituted piperidines, decahydroquinolines and octahydroindolizines by radical rearrangement reactions of 2-alkylideneaziridines
作者:Natacha Prévost、Michael Shipman
DOI:10.1016/s0040-4020(02)00730-5
日期:2002.8
Rearrangement of a variety of 3-(2-methyleneaziridin-1-yl)propyl radicals, generated using Bu3SnH/AIBN by homolytic cleavage of phenylselenide substituted 2-methyleneaziridines, produces 3-methylenepiperidines in yields ranging from 58 to 68%. By combining this radical rearrangement with an additional 5-exo-trig cyclisation, this method provides an octahydroindolizine with moderate levels of diastereocontrol
使用Bu 3 SnH / AIBN通过苯硒化物取代的2-亚甲基氮丙啶的均相裂解生成的各种3-(2-亚甲基氮丙啶-1-基)丙基自由基的重排产生3-亚甲基哌啶,产率为58-68%。通过将该自由基重排与另外的5- exo- trig环化结合,该方法提供了具有中等水平的非对映异构控制的八氢吲哚嗪(dr = 4:1)。该重排可与相关的2-异丙基亚氮丙啶一起使用,但是不能成功地扩展至4-(2-亚甲基叠氮基-1-基)丁基。