Highly Enantioselective Rh-Catalyzed Alkenylation of Imines: Synthesis of Chiral Allylic Amines via Asymmetric Addition of Potassium Alkenyltrifluoroborates to <i>N</i>-Tosyl Imines
作者:Balraj Gopula、Chien-Wei Chiang、Way-Zen Lee、Ting-Shen Kuo、Ping-Yu Wu、Julian P. Henschke、Hsyueh-Liang Wu
DOI:10.1021/ol4035897
日期:2014.1.17
For the first time, simple N-tosyl aryl aldimines, prepared from the condensation of tosyl amide and aromatic aldehydes, can be used as substrates in the rhodium catalyzed 1,2-addition reaction using alkenylboron nucleophiles. In the presence of 1.5 mol % of [RhCl(1e)]2, enantioselective addition of various potassium alkenyltrifluoroborates to aryl aldimines furnished the corresponding chiral allylic
第一次,由甲苯磺酰胺和芳族醛缩合制得的简单的N-甲苯磺酰基芳基亚胺可以用作使用烯基硼亲核试剂在铑催化的1,2-加成反应中的底物。在存在1.5 mol%的[RhCl(1e)] 2的情况下,将各种烯基三氟硼酸钾对映体选择性添加到芳基亚胺中,以73-96%的收率和72-> 99.5%ee的产率提供了相应的手性烯丙基胺。值得注意的是,该方法有效地提供了具有高不对称诱导作用的二,三和四取代的烯丙基N-甲苯磺酰基胺。