Facile construction of three-membered rings via benzyne-promoted Darzens-type reaction of tertiary amines
作者:Ya-Nan Xu、Shi-Kai Tian
DOI:10.1016/j.tet.2018.11.065
日期:2019.3
A range of tertiary amines having electron-withdrawing groups were activated in situ by benzyne, generated from 2-(trimethylsilyl)phenyl triflate and a fluoride source, and participated in the Darzens-type reaction with carbonyl compounds, imines, and vinyl ketones to afford structurally diverse epoxides, aziridines, and cyclopropanes, respectively, in moderate to excellent yields with high trans-selectivity
一系列具有吸电子基团的叔胺被苯炔原位活化,由2-(三甲基甲硅烷基)苯基三氟甲磺酸酯和氟化物源产生,并参与了与羰基化合物,亚胺和乙烯基酮的Darzens型反应,从而制得结构各异的环氧化物,氮丙啶和环丙烷分别以中等至优异的收率和高反式选择性获得。该反应包括由叔胺和苯并合物原位形成未应变的铵化铵,在没有过渡金属和强碱的情况下进行,并能耐受多种官能团。