Lewis Acid-catalyzed [3 + 2]Cyclo-addition of Alkynes with<i>N</i>-Tosyl-aziridines via Carbon–Carbon Bond Cleavage: Synthesis of Highly Substituted 3-Pyrrolines
作者:Lei Li、Junliang Zhang
DOI:10.1021/ol202603e
日期:2011.11.18
A novel, efficient, and highly regioselective Lewis acid-catalyzed [3 + 2] cycloaddition of alkynes with azomethine ylides, which are easily obtained from N-tosylaziridines via C–C bond heterolysis at room temperature was developed. Moderate enantioselectivity (70% ee) can be achieved by the application of the commercially available chiral Pybox 7 as the ligand.
开发了一种新颖,高效且具有高区域选择性的路易斯酸,使炔烃与偶氮甲碱的环[3 + 2]环加成反应,可以在室温下通过C-C键杂化从N-甲苯磺酰基az啶轻松获得。通过应用可商购的手性Pybox 7作为配体可以实现中等的对映选择性(70%ee)。