Divergent Synthesis of Enantioenriched β-Functional Amines via Desymmetrization of <i>meso</i>-Aziridines with Isocyanides
作者:Xiangqiang Li、Qian Xiong、Mingming Guan、Shunxi Dong、Xiaohua Liu、Xiaoming Feng
DOI:10.1021/acs.orglett.9b02242
日期:2019.8.2
enantioselective ring-opening desymmetrization of meso-aziridines with isocyanides was achieved in the presence of a chiral N,N′-dioxide/Mg(OTf)2 complex. The in situ generated chiral 1,4-zwitterionic intermediates were successfully trapped by intramolecular oxygen- and carbon-based nucleophiles or exogenous H2O and TMSN3, enabling a collective synthesis of various chiral vicinal amino-oxazoles, spiroindolines,
在手性N,N'-二氧化物/ Mg(OTf)2络合物的存在下,内消旋氮杂环丁烷与异氰酸酯的高度对映选择性开环脱对称。原位产生的手性1,4-两性离子中间体被分子内基于氧和碳的亲核试剂或外源H 2 O和TMSN 3成功捕获,从而可以合成各种手性邻位氨基恶唑,螺二氢吲哚和β-氨基酰胺和四唑衍生物,具有中等至高收率,具有出色的对映选择性。