Chiral Primary Amine-Catalyzed Divergent Coupling of α-Substituted Acrylaldehydes with α-Diazoesters
作者:Zaikun Xue、Yao Li、Sanzhong Luo
DOI:10.1021/acscatal.0c02405
日期:2020.10.2
We report, herein, aminocatalytic coupling of α-substituted acrylaldehydes with α-diazoesters, leading to chemoselective C–H insertion or cyclopropanation depending on α-substituents of diazoesters. A chiral primary–secondary diamine catalyst derived from l-tert-leucine enabled the efficient promotion of both C–H insertion and cyclopropanation pathways in good yields and high enantioselectivities at
我们在此报告,α-取代的丙烯醛与α-重氮酯的氨基催化偶联,取决于重氮酸酯的α-取代基,导致化学选择性的C–H插入或环丙烷化。衍生自手性初级仲二胺催化剂升-叔-亮氨启用有效促进良好产率,并在室温高对映选择性两者C-H插入和环丙烷途径没有任何金属或路易斯酸助催化剂。机理研究发现了亚硝酸根离子介导的1,3-偶极环加成途径,其中重氮碳的电子性质决定了该氨基催化循环中的化学选择性。