Copper‐Catalyzed Regio‐ and Enantioselective Addition of Silicon Grignard Reagents to Alkenes Activated by Azaaryl Groups
作者:Wenbin Mao、Weichao Xue、Elisabeth Irran、Martin Oestreich
DOI:10.1002/anie.201905934
日期:2019.7.29
A new application of silicon Grignard reagents in C(sp3)−Si bond formation is reported. With the aid of BF3⋅OEt2, these silicon nucleophiles add across alkenes activated by various azaaryl groups under copper catalysis. An enantioselective version employing benzoxazole‐activated alkenes as substrates and a CuI‐josiphos complex as catalyst has been developed, forming the C(sp3)−Si bond with good to
据报道硅格氏试剂在C(sp 3)-Si键形成中的新应用。借助于BF 3· OEt 2,这些硅亲核试剂在铜催化下跨由各种氮杂芳基基团活化的烯烃加成。已开发出以苯并恶唑活化的烯烃为底物和CuI-Josiphos络合物为催化剂的对映选择性版本,形成具有良好或高对映体比率(高达97:3)的C(sp3)-Si键。该方法扩展了用于“共轭加成”类型C(sp 3)-Si键形成的工具箱。