Facile Construction of Tetrahydropyrrolizines by Iron-Catalyzed Double Cyclization of Alkene-Tethered Oxime Esters with 1,2-Disubstituted Alkenes
作者:Takuya Shimbayashi、Daiki Nakamoto、Kazuhiro Okamoto、Kouichi Ohe
DOI:10.1021/acs.orglett.8b01073
日期:2018.5.18
cycloaddition reaction of alkene-tethered oxime esters with 1,2-disubstituted alkenes afforded tetrahydropyrrolizines, the structural motif often seen in bicyclic alkaloids. The reaction proceeds through consecutive cycloaddition reactions. These include, first, intramolecular cyclization, followed by intermolecular cyclization with a 1,2-disubstituted alkene in a regioselective manner where an imine moiety
链拴的肟酯与1,2-二取代的烯烃的铁催化的环加成反应得到四氢吡咯烷酮,其结构基序通常出现在双环生物碱中。该反应通过连续的环加成反应进行。这些包括,首先,分子内环化,然后以区域选择性的方式用1,2-二取代的烯烃进行分子间环化,其中首先产生的亚胺部分起关键作用。