Lewis Base/Copper Cooperatively Catalyzed Asymmetric α-Amination of Esters with Diaziridinone
作者:Jin Song、Zi-Jing Zhang、Shu-Sen Chen、Tao Fan、Liu-Zhu Gong
DOI:10.1021/jacs.7b12628
日期:2018.3.7
An enantioselective α-amination of esters by a Lewis base/copper(I) cooperative catalysis strategy has been developed. The transient chiral C1-ammonium enolate generated from pentafluorophenyl ester and nucleophilic Lewis base is nicely compatible with the copper intermediate formed from N, N-di- t-butyldiaziridinone and Cu(I) to allow for high levels of stereochemical control. The cooperative catalytic
已经开发了通过路易斯碱/铜(I)协同催化策略对酯进行对映选择性α-胺化。由五氟苯基酯和亲核路易斯碱生成的瞬态手性 C1-烯醇铵与由 N, N-二叔丁基二氮杂环丙烷酮和 Cu(I) 形成的铜中间体非常相容,以实现高水平的立体化学控制。协同催化反应以良好的收率和优异的对映选择性 (90-99% ee) 产生了多种高度对映体富集的乙内酰脲。