Synthesis of highly substituted pyrrolidines via palladium-catalyzed cyclization of 5-vinyloxazolidinones and activated alkenes
作者:Julian G. Knight、Paul A. Stoker、Kirill Tchabanenko、Simon J. Harwood、Kenneth W.M. Lawrie
DOI:10.1016/j.tet.2008.02.019
日期:2008.4
undergoes a palladium-catalyzed decarboxylative cyclization across a range of electrophilic alkenes to give the corresponding pyrrolidine derivatives bearing two contiguous quaternary centres. Alkenes bearing two electron-withdrawing groups are required; pyrrolidines were not formed from mono-activated alkenes. Bulky, electron-rich phosphines promote pyrrolidine formation with less highly electrophilic
N -Tosyl-5,5-diinyloxazolidin-2-one在一系列亲电烯烃上进行钯催化的脱羧环化反应,得到相应的带有两个连续四元中心的吡咯烷衍生物。需要带有两个吸电子基团的烯烃。吡咯烷不是由单活化烯烃形成的。大块的富含电子的膦与亲电性较低的双活化烯烃一起促进吡咯烷的形成,并且在碘化物的存在下观察到显着的改善。